1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // no precompiled headers
26 #include "jvm.h"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "code/icBuffer.hpp"
31 #include "code/vtableStubs.hpp"
32 #include "compiler/compileBroker.hpp"
33 #include "compiler/disassembler.hpp"
34 #include "interpreter/interpreter.hpp"
35 #include "logging/log.hpp"
36 #include "logging/logStream.hpp"
37 #include "memory/allocation.inline.hpp"
38 #include "memory/filemap.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "os_share_solaris.hpp"
41 #include "os_solaris.inline.hpp"
42 #include "prims/jniFastGetField.hpp"
43 #include "prims/jvm_misc.hpp"
44 #include "runtime/arguments.hpp"
45 #include "runtime/atomic.hpp"
46 #include "runtime/extendedPC.hpp"
47 #include "runtime/globals.hpp"
48 #include "runtime/interfaceSupport.inline.hpp"
49 #include "runtime/java.hpp"
50 #include "runtime/javaCalls.hpp"
51 #include "runtime/mutexLocker.hpp"
52 #include "runtime/objectMonitor.hpp"
53 #include "runtime/orderAccess.hpp"
54 #include "runtime/osThread.hpp"
55 #include "runtime/perfMemory.hpp"
56 #include "runtime/sharedRuntime.hpp"
57 #include "runtime/statSampler.hpp"
58 #include "runtime/stubRoutines.hpp"
59 #include "runtime/thread.inline.hpp"
60 #include "runtime/threadCritical.hpp"
61 #include "runtime/timer.hpp"
62 #include "runtime/vm_version.hpp"
63 #include "semaphore_posix.hpp"
64 #include "services/attachListener.hpp"
65 #include "services/memTracker.hpp"
66 #include "services/runtimeService.hpp"
67 #include "utilities/align.hpp"
68 #include "utilities/decoder.hpp"
69 #include "utilities/defaultStream.hpp"
70 #include "utilities/events.hpp"
71 #include "utilities/growableArray.hpp"
72 #include "utilities/macros.hpp"
73 #include "utilities/vmError.hpp"
74
75 // put OS-includes here
76 # include <dlfcn.h>
77 # include <errno.h>
78 # include <exception>
79 # include <link.h>
80 # include <poll.h>
81 # include <pthread.h>
82 # include <schedctl.h>
83 # include <setjmp.h>
84 # include <signal.h>
85 # include <stdio.h>
86 # include <alloca.h>
87 # include <sys/filio.h>
88 # include <sys/ipc.h>
89 # include <sys/lwp.h>
90 # include <sys/machelf.h> // for elf Sym structure used by dladdr1
91 # include <sys/mman.h>
92 # include <sys/processor.h>
93 # include <sys/procset.h>
94 # include <sys/pset.h>
95 # include <sys/resource.h>
96 # include <sys/shm.h>
97 # include <sys/socket.h>
98 # include <sys/stat.h>
99 # include <sys/systeminfo.h>
100 # include <sys/time.h>
101 # include <sys/times.h>
102 # include <sys/types.h>
103 # include <sys/wait.h>
104 # include <sys/utsname.h>
105 # include <thread.h>
106 # include <unistd.h>
107 # include <sys/priocntl.h>
108 # include <sys/rtpriocntl.h>
109 # include <sys/tspriocntl.h>
110 # include <sys/iapriocntl.h>
111 # include <sys/fxpriocntl.h>
112 # include <sys/loadavg.h>
113 # include <string.h>
114 # include <stdio.h>
115
116 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later
117 # include <sys/procfs.h> // see comment in <sys/procfs.h>
118
119 #define MAX_PATH (2 * K)
120
121 // for timer info max values which include all bits
122 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
123
124
125 // Here are some liblgrp types from sys/lgrp_user.h to be able to
126 // compile on older systems without this header file.
127
128 #ifndef MADV_ACCESS_LWP
129 #define MADV_ACCESS_LWP 7 /* next LWP to access heavily */
130 #endif
131 #ifndef MADV_ACCESS_MANY
132 #define MADV_ACCESS_MANY 8 /* many processes to access heavily */
133 #endif
134
135 #ifndef LGRP_RSRC_CPU
136 #define LGRP_RSRC_CPU 0 /* CPU resources */
137 #endif
138 #ifndef LGRP_RSRC_MEM
139 #define LGRP_RSRC_MEM 1 /* memory resources */
140 #endif
141
142 // Values for ThreadPriorityPolicy == 1
143 int prio_policy1[CriticalPriority+1] = {
144 -99999, 0, 16, 32, 48, 64,
145 80, 96, 112, 124, 127, 127 };
146
147 // System parameters used internally
148 static clock_t clock_tics_per_sec = 100;
149
150 // Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+)
151 static bool enabled_extended_FILE_stdio = false;
152
153 // For diagnostics to print a message once. see run_periodic_checks
154 static bool check_addr0_done = false;
155 static sigset_t check_signal_done;
156 static bool check_signals = true;
157
158 address os::Solaris::handler_start; // start pc of thr_sighndlrinfo
159 address os::Solaris::handler_end; // end pc of thr_sighndlrinfo
160
161 address os::Solaris::_main_stack_base = NULL; // 4352906 workaround
162
163 os::Solaris::pthread_setname_np_func_t os::Solaris::_pthread_setname_np = NULL;
164
165 // "default" initializers for missing libc APIs
166 extern "C" {
lwp_mutex_init(mutex_t * mx,int scope,void * arg)167 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
lwp_mutex_destroy(mutex_t * mx)168 static int lwp_mutex_destroy(mutex_t *mx) { return 0; }
169
lwp_cond_init(cond_t * cv,int scope,void * arg)170 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
lwp_cond_destroy(cond_t * cv)171 static int lwp_cond_destroy(cond_t *cv) { return 0; }
172 }
173
174 // "default" initializers for pthread-based synchronization
175 extern "C" {
pthread_mutex_default_init(mutex_t * mx,int scope,void * arg)176 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
pthread_cond_default_init(cond_t * cv,int scope,void * arg)177 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
178 }
179
180 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time);
181
adjust_stack_size(address base,size_t size)182 static inline size_t adjust_stack_size(address base, size_t size) {
183 if ((ssize_t)size < 0) {
184 // 4759953: Compensate for ridiculous stack size.
185 size = max_intx;
186 }
187 if (size > (size_t)base) {
188 // 4812466: Make sure size doesn't allow the stack to wrap the address space.
189 size = (size_t)base;
190 }
191 return size;
192 }
193
get_stack_info()194 static inline stack_t get_stack_info() {
195 stack_t st;
196 int retval = thr_stksegment(&st);
197 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size);
198 assert(retval == 0, "incorrect return value from thr_stksegment");
199 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
200 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
201 return st;
202 }
203
_handle_uncaught_cxx_exception()204 static void _handle_uncaught_cxx_exception() {
205 VMError::report_and_die("An uncaught C++ exception");
206 }
207
is_primordial_thread(void)208 bool os::is_primordial_thread(void) {
209 int r = thr_main();
210 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689");
211 return r == 1;
212 }
213
current_stack_base()214 address os::current_stack_base() {
215 bool _is_primordial_thread = is_primordial_thread();
216
217 // Workaround 4352906, avoid calls to thr_stksegment by
218 // thr_main after the first one (it looks like we trash
219 // some data, causing the value for ss_sp to be incorrect).
220 if (!_is_primordial_thread || os::Solaris::_main_stack_base == NULL) {
221 stack_t st = get_stack_info();
222 if (_is_primordial_thread) {
223 // cache initial value of stack base
224 os::Solaris::_main_stack_base = (address)st.ss_sp;
225 }
226 return (address)st.ss_sp;
227 } else {
228 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base");
229 return os::Solaris::_main_stack_base;
230 }
231 }
232
current_stack_size()233 size_t os::current_stack_size() {
234 size_t size;
235
236 if (!is_primordial_thread()) {
237 size = get_stack_info().ss_size;
238 } else {
239 struct rlimit limits;
240 getrlimit(RLIMIT_STACK, &limits);
241 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur);
242 }
243 // base may not be page aligned
244 address base = current_stack_base();
245 address bottom = align_up(base - size, os::vm_page_size());;
246 return (size_t)(base - bottom);
247 }
248
localtime_pd(const time_t * clock,struct tm * res)249 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
250 return localtime_r(clock, res);
251 }
252
try_enable_extended_io()253 void os::Solaris::try_enable_extended_io() {
254 typedef int (*enable_extended_FILE_stdio_t)(int, int);
255
256 if (!UseExtendedFileIO) {
257 return;
258 }
259
260 enable_extended_FILE_stdio_t enabler =
261 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT,
262 "enable_extended_FILE_stdio");
263 if (enabler) {
264 enabler(-1, -1);
265 }
266 }
267
268 static int _processors_online = 0;
269
270 jint os::Solaris::_os_thread_limit = 0;
271 volatile jint os::Solaris::_os_thread_count = 0;
272
available_memory()273 julong os::available_memory() {
274 return Solaris::available_memory();
275 }
276
available_memory()277 julong os::Solaris::available_memory() {
278 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size();
279 }
280
281 julong os::Solaris::_physical_memory = 0;
282
physical_memory()283 julong os::physical_memory() {
284 return Solaris::physical_memory();
285 }
286
287 static hrtime_t first_hrtime = 0;
288 static const hrtime_t hrtime_hz = 1000*1000*1000;
289 static volatile hrtime_t max_hrtime = 0;
290
291
initialize_system_info()292 void os::Solaris::initialize_system_info() {
293 set_processor_count(sysconf(_SC_NPROCESSORS_CONF));
294 _processors_online = sysconf(_SC_NPROCESSORS_ONLN);
295 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) *
296 (julong)sysconf(_SC_PAGESIZE);
297 }
298
processor_id()299 uint os::processor_id() {
300 const processorid_t id = ::getcpuid();
301 assert(id >= 0 && id < _processor_count, "Invalid processor id");
302 return (uint)id;
303 }
304
active_processor_count()305 int os::active_processor_count() {
306 // User has overridden the number of active processors
307 if (ActiveProcessorCount > 0) {
308 log_trace(os)("active_processor_count: "
309 "active processor count set by user : %d",
310 ActiveProcessorCount);
311 return ActiveProcessorCount;
312 }
313
314 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN);
315 pid_t pid = getpid();
316 psetid_t pset = PS_NONE;
317 // Are we running in a processor set or is there any processor set around?
318 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) {
319 uint_t pset_cpus;
320 // Query the number of cpus available to us.
321 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) {
322 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check");
323 _processors_online = pset_cpus;
324 return pset_cpus;
325 }
326 }
327 // Otherwise return number of online cpus
328 return online_cpus;
329 }
330
find_processors_in_pset(psetid_t pset,processorid_t ** id_array,uint_t * id_length)331 static bool find_processors_in_pset(psetid_t pset,
332 processorid_t** id_array,
333 uint_t* id_length) {
334 bool result = false;
335 // Find the number of processors in the processor set.
336 if (pset_info(pset, NULL, id_length, NULL) == 0) {
337 // Make up an array to hold their ids.
338 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
339 // Fill in the array with their processor ids.
340 if (pset_info(pset, NULL, id_length, *id_array) == 0) {
341 result = true;
342 }
343 }
344 return result;
345 }
346
347 // Callers of find_processors_online() must tolerate imprecise results --
348 // the system configuration can change asynchronously because of DR
349 // or explicit psradm operations.
350 //
351 // We also need to take care that the loop (below) terminates as the
352 // number of processors online can change between the _SC_NPROCESSORS_ONLN
353 // request and the loop that builds the list of processor ids. Unfortunately
354 // there's no reliable way to determine the maximum valid processor id,
355 // so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online
356 // man pages, which claim the processor id set is "sparse, but
357 // not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually
358 // exit the loop.
359 //
360 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's
361 // not available on S8.0.
362
find_processors_online(processorid_t ** id_array,uint * id_length)363 static bool find_processors_online(processorid_t** id_array,
364 uint* id_length) {
365 const processorid_t MAX_PROCESSOR_ID = 100000;
366 // Find the number of processors online.
367 *id_length = sysconf(_SC_NPROCESSORS_ONLN);
368 // Make up an array to hold their ids.
369 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
370 // Processors need not be numbered consecutively.
371 long found = 0;
372 processorid_t next = 0;
373 while (found < *id_length && next < MAX_PROCESSOR_ID) {
374 processor_info_t info;
375 if (processor_info(next, &info) == 0) {
376 // NB, PI_NOINTR processors are effectively online ...
377 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) {
378 (*id_array)[found] = next;
379 found += 1;
380 }
381 }
382 next += 1;
383 }
384 if (found < *id_length) {
385 // The loop above didn't identify the expected number of processors.
386 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN)
387 // and re-running the loop, above, but there's no guarantee of progress
388 // if the system configuration is in flux. Instead, we just return what
389 // we've got. Note that in the worst case find_processors_online() could
390 // return an empty set. (As a fall-back in the case of the empty set we
391 // could just return the ID of the current processor).
392 *id_length = found;
393 }
394
395 return true;
396 }
397
assign_distribution(processorid_t * id_array,uint id_length,uint * distribution,uint distribution_length)398 static bool assign_distribution(processorid_t* id_array,
399 uint id_length,
400 uint* distribution,
401 uint distribution_length) {
402 // We assume we can assign processorid_t's to uint's.
403 assert(sizeof(processorid_t) == sizeof(uint),
404 "can't convert processorid_t to uint");
405 // Quick check to see if we won't succeed.
406 if (id_length < distribution_length) {
407 return false;
408 }
409 // Assign processor ids to the distribution.
410 // Try to shuffle processors to distribute work across boards,
411 // assuming 4 processors per board.
412 const uint processors_per_board = ProcessDistributionStride;
413 // Find the maximum processor id.
414 processorid_t max_id = 0;
415 for (uint m = 0; m < id_length; m += 1) {
416 max_id = MAX2(max_id, id_array[m]);
417 }
418 // The next id, to limit loops.
419 const processorid_t limit_id = max_id + 1;
420 // Make up markers for available processors.
421 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal);
422 for (uint c = 0; c < limit_id; c += 1) {
423 available_id[c] = false;
424 }
425 for (uint a = 0; a < id_length; a += 1) {
426 available_id[id_array[a]] = true;
427 }
428 // Step by "boards", then by "slot", copying to "assigned".
429 // NEEDS_CLEANUP: The assignment of processors should be stateful,
430 // remembering which processors have been assigned by
431 // previous calls, etc., so as to distribute several
432 // independent calls of this method. What we'd like is
433 // It would be nice to have an API that let us ask
434 // how many processes are bound to a processor,
435 // but we don't have that, either.
436 // In the short term, "board" is static so that
437 // subsequent distributions don't all start at board 0.
438 static uint board = 0;
439 uint assigned = 0;
440 // Until we've found enough processors ....
441 while (assigned < distribution_length) {
442 // ... find the next available processor in the board.
443 for (uint slot = 0; slot < processors_per_board; slot += 1) {
444 uint try_id = board * processors_per_board + slot;
445 if ((try_id < limit_id) && (available_id[try_id] == true)) {
446 distribution[assigned] = try_id;
447 available_id[try_id] = false;
448 assigned += 1;
449 break;
450 }
451 }
452 board += 1;
453 if (board * processors_per_board + 0 >= limit_id) {
454 board = 0;
455 }
456 }
457 if (available_id != NULL) {
458 FREE_C_HEAP_ARRAY(bool, available_id);
459 }
460 return true;
461 }
462
set_native_thread_name(const char * name)463 void os::set_native_thread_name(const char *name) {
464 if (Solaris::_pthread_setname_np != NULL) {
465 // Only the first 31 bytes of 'name' are processed by pthread_setname_np
466 // but we explicitly copy into a size-limited buffer to avoid any
467 // possible overflow.
468 char buf[32];
469 snprintf(buf, sizeof(buf), "%s", name);
470 buf[sizeof(buf) - 1] = '\0';
471 Solaris::_pthread_setname_np(pthread_self(), buf);
472 }
473 }
474
distribute_processes(uint length,uint * distribution)475 bool os::distribute_processes(uint length, uint* distribution) {
476 bool result = false;
477 // Find the processor id's of all the available CPUs.
478 processorid_t* id_array = NULL;
479 uint id_length = 0;
480 // There are some races between querying information and using it,
481 // since processor sets can change dynamically.
482 psetid_t pset = PS_NONE;
483 // Are we running in a processor set?
484 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) {
485 result = find_processors_in_pset(pset, &id_array, &id_length);
486 } else {
487 result = find_processors_online(&id_array, &id_length);
488 }
489 if (result == true) {
490 if (id_length >= length) {
491 result = assign_distribution(id_array, id_length, distribution, length);
492 } else {
493 result = false;
494 }
495 }
496 if (id_array != NULL) {
497 FREE_C_HEAP_ARRAY(processorid_t, id_array);
498 }
499 return result;
500 }
501
bind_to_processor(uint processor_id)502 bool os::bind_to_processor(uint processor_id) {
503 // We assume that a processorid_t can be stored in a uint.
504 assert(sizeof(uint) == sizeof(processorid_t),
505 "can't convert uint to processorid_t");
506 int bind_result =
507 processor_bind(P_LWPID, // bind LWP.
508 P_MYID, // bind current LWP.
509 (processorid_t) processor_id, // id.
510 NULL); // don't return old binding.
511 return (bind_result == 0);
512 }
513
514 // Return true if user is running as root.
515
have_special_privileges()516 bool os::have_special_privileges() {
517 static bool init = false;
518 static bool privileges = false;
519 if (!init) {
520 privileges = (getuid() != geteuid()) || (getgid() != getegid());
521 init = true;
522 }
523 return privileges;
524 }
525
526
init_system_properties_values()527 void os::init_system_properties_values() {
528 // The next steps are taken in the product version:
529 //
530 // Obtain the JAVA_HOME value from the location of libjvm.so.
531 // This library should be located at:
532 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
533 //
534 // If "/jre/lib/" appears at the right place in the path, then we
535 // assume libjvm.so is installed in a JDK and we use this path.
536 //
537 // Otherwise exit with message: "Could not create the Java virtual machine."
538 //
539 // The following extra steps are taken in the debugging version:
540 //
541 // If "/jre/lib/" does NOT appear at the right place in the path
542 // instead of exit check for $JAVA_HOME environment variable.
543 //
544 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
545 // then we append a fake suffix "hotspot/libjvm.so" to this path so
546 // it looks like libjvm.so is installed there
547 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
548 //
549 // Otherwise exit.
550 //
551 // Important note: if the location of libjvm.so changes this
552 // code needs to be changed accordingly.
553
554 // Base path of extensions installed on the system.
555 #define SYS_EXT_DIR "/usr/jdk/packages"
556 #define EXTENSIONS_DIR "/lib/ext"
557
558 // Buffer that fits several sprintfs.
559 // Note that the space for the colon and the trailing null are provided
560 // by the nulls included by the sizeof operator.
561 const size_t bufsize =
562 MAX3((size_t)MAXPATHLEN, // For dll_dir & friends.
563 sizeof(SYS_EXT_DIR) + sizeof("/lib/"), // invariant ld_library_path
564 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir
565 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
566
567 // sysclasspath, java_home, dll_dir
568 {
569 char *pslash;
570 os::jvm_path(buf, bufsize);
571
572 // Found the full path to libjvm.so.
573 // Now cut the path to <java_home>/jre if we can.
574 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
575 pslash = strrchr(buf, '/');
576 if (pslash != NULL) {
577 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
578 }
579 Arguments::set_dll_dir(buf);
580
581 if (pslash != NULL) {
582 pslash = strrchr(buf, '/');
583 if (pslash != NULL) {
584 *pslash = '\0'; // Get rid of /lib.
585 }
586 }
587 Arguments::set_java_home(buf);
588 set_boot_path('/', ':');
589 }
590
591 // Where to look for native libraries.
592 {
593 // Use dlinfo() to determine the correct java.library.path.
594 //
595 // If we're launched by the Java launcher, and the user
596 // does not set java.library.path explicitly on the commandline,
597 // the Java launcher sets LD_LIBRARY_PATH for us and unsets
598 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case
599 // dlinfo returns LD_LIBRARY_PATH + crle settings (including
600 // /usr/lib), which is exactly what we want.
601 //
602 // If the user does set java.library.path, it completely
603 // overwrites this setting, and always has.
604 //
605 // If we're not launched by the Java launcher, we may
606 // get here with any/all of the LD_LIBRARY_PATH[_32|64]
607 // settings. Again, dlinfo does exactly what we want.
608
609 Dl_serinfo info_sz, *info = &info_sz;
610 Dl_serpath *path;
611 char *library_path;
612 char *common_path = buf;
613
614 // Determine search path count and required buffer size.
615 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) {
616 FREE_C_HEAP_ARRAY(char, buf);
617 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror());
618 }
619
620 // Allocate new buffer and initialize.
621 info = (Dl_serinfo*)NEW_C_HEAP_ARRAY(char, info_sz.dls_size, mtInternal);
622 info->dls_size = info_sz.dls_size;
623 info->dls_cnt = info_sz.dls_cnt;
624
625 // Obtain search path information.
626 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) {
627 FREE_C_HEAP_ARRAY(char, buf);
628 FREE_C_HEAP_ARRAY(char, info);
629 vm_exit_during_initialization("dlinfo SERINFO request", dlerror());
630 }
631
632 path = &info->dls_serpath[0];
633
634 // Note: Due to a legacy implementation, most of the library path
635 // is set in the launcher. This was to accomodate linking restrictions
636 // on legacy Solaris implementations (which are no longer supported).
637 // Eventually, all the library path setting will be done here.
638 //
639 // However, to prevent the proliferation of improperly built native
640 // libraries, the new path component /usr/jdk/packages is added here.
641
642 // Construct the invariant part of ld_library_path.
643 sprintf(common_path, SYS_EXT_DIR "/lib");
644
645 // Struct size is more than sufficient for the path components obtained
646 // through the dlinfo() call, so only add additional space for the path
647 // components explicitly added here.
648 size_t library_path_size = info->dls_size + strlen(common_path);
649 library_path = (char *)NEW_C_HEAP_ARRAY(char, library_path_size, mtInternal);
650 library_path[0] = '\0';
651
652 // Construct the desired Java library path from the linker's library
653 // search path.
654 //
655 // For compatibility, it is optimal that we insert the additional path
656 // components specific to the Java VM after those components specified
657 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so
658 // infrastructure.
659 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it.
660 strcpy(library_path, common_path);
661 } else {
662 int inserted = 0;
663 int i;
664 for (i = 0; i < info->dls_cnt; i++, path++) {
665 uint_t flags = path->dls_flags & LA_SER_MASK;
666 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) {
667 strcat(library_path, common_path);
668 strcat(library_path, os::path_separator());
669 inserted = 1;
670 }
671 strcat(library_path, path->dls_name);
672 strcat(library_path, os::path_separator());
673 }
674 // Eliminate trailing path separator.
675 library_path[strlen(library_path)-1] = '\0';
676 }
677
678 // happens before argument parsing - can't use a trace flag
679 // tty->print_raw("init_system_properties_values: native lib path: ");
680 // tty->print_raw_cr(library_path);
681
682 // Callee copies into its own buffer.
683 Arguments::set_library_path(library_path);
684
685 FREE_C_HEAP_ARRAY(char, library_path);
686 FREE_C_HEAP_ARRAY(char, info);
687 }
688
689 // Extensions directories.
690 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
691 Arguments::set_ext_dirs(buf);
692
693 FREE_C_HEAP_ARRAY(char, buf);
694
695 #undef SYS_EXT_DIR
696 #undef EXTENSIONS_DIR
697 }
698
breakpoint()699 void os::breakpoint() {
700 BREAKPOINT;
701 }
702
obsolete_option(const JavaVMOption * option)703 bool os::obsolete_option(const JavaVMOption *option) {
704 if (!strncmp(option->optionString, "-Xt", 3)) {
705 return true;
706 } else if (!strncmp(option->optionString, "-Xtm", 4)) {
707 return true;
708 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) {
709 return true;
710 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) {
711 return true;
712 }
713 return false;
714 }
715
valid_stack_address(Thread * thread,address sp)716 bool os::Solaris::valid_stack_address(Thread* thread, address sp) {
717 address stackStart = (address)thread->stack_base();
718 address stackEnd = (address)(stackStart - (address)thread->stack_size());
719 if (sp < stackStart && sp >= stackEnd) return true;
720 return false;
721 }
722
breakpoint()723 extern "C" void breakpoint() {
724 // use debugger to set breakpoint here
725 }
726
727 static thread_t main_thread;
728
729 // Thread start routine for all newly created threads
thread_native_entry(void * thread_addr)730 extern "C" void* thread_native_entry(void* thread_addr) {
731
732 Thread* thread = (Thread*)thread_addr;
733
734 thread->record_stack_base_and_size();
735
736 // Try to randomize the cache line index of hot stack frames.
737 // This helps when threads of the same stack traces evict each other's
738 // cache lines. The threads can be either from the same JVM instance, or
739 // from different JVM instances. The benefit is especially true for
740 // processors with hyperthreading technology.
741 static int counter = 0;
742 int pid = os::current_process_id();
743 alloca(((pid ^ counter++) & 7) * 128);
744
745 int prio;
746
747 thread->initialize_thread_current();
748
749 OSThread* osthr = thread->osthread();
750
751 osthr->set_lwp_id(_lwp_self()); // Store lwp in case we are bound
752 thread->_schedctl = (void *) schedctl_init();
753
754 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").",
755 os::current_thread_id());
756
757 if (UseNUMA) {
758 int lgrp_id = os::numa_get_group_id();
759 if (lgrp_id != -1) {
760 thread->set_lgrp_id(lgrp_id);
761 }
762 }
763
764 // Our priority was set when we were created, and stored in the
765 // osthread, but couldn't be passed through to our LWP until now.
766 // So read back the priority and set it again.
767
768 if (osthr->thread_id() != -1) {
769 if (UseThreadPriorities) {
770 int prio = osthr->native_priority();
771 if (ThreadPriorityVerbose) {
772 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is "
773 INTPTR_FORMAT ", setting priority: %d\n",
774 osthr->thread_id(), osthr->lwp_id(), prio);
775 }
776 os::set_native_priority(thread, prio);
777 }
778 } else if (ThreadPriorityVerbose) {
779 warning("Can't set priority in _start routine, thread id hasn't been set\n");
780 }
781
782 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
783
784 // initialize signal mask for this thread
785 os::Solaris::hotspot_sigmask(thread);
786
787 os::Solaris::init_thread_fpu_state();
788 std::set_terminate(_handle_uncaught_cxx_exception);
789
790 thread->call_run();
791
792 // Note: at this point the thread object may already have deleted itself.
793 // Do not dereference it from here on out.
794
795 // One less thread is executing
796 // When the VMThread gets here, the main thread may have already exited
797 // which frees the CodeHeap containing the Atomic::dec code
798 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
799 Atomic::dec(&os::Solaris::_os_thread_count);
800 }
801
802 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id());
803
804 if (UseDetachedThreads) {
805 thr_exit(NULL);
806 ShouldNotReachHere();
807 }
808 return NULL;
809 }
810
create_os_thread(Thread * thread,thread_t thread_id)811 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) {
812 // Allocate the OSThread object
813 OSThread* osthread = new OSThread(NULL, NULL);
814 if (osthread == NULL) return NULL;
815
816 // Store info on the Solaris thread into the OSThread
817 osthread->set_thread_id(thread_id);
818 osthread->set_lwp_id(_lwp_self());
819 thread->_schedctl = (void *) schedctl_init();
820
821 if (UseNUMA) {
822 int lgrp_id = os::numa_get_group_id();
823 if (lgrp_id != -1) {
824 thread->set_lgrp_id(lgrp_id);
825 }
826 }
827
828 if (ThreadPriorityVerbose) {
829 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n",
830 osthread->thread_id(), osthread->lwp_id());
831 }
832
833 // Initial thread state is INITIALIZED, not SUSPENDED
834 osthread->set_state(INITIALIZED);
835
836 return osthread;
837 }
838
hotspot_sigmask(Thread * thread)839 void os::Solaris::hotspot_sigmask(Thread* thread) {
840 //Save caller's signal mask
841 sigset_t sigmask;
842 pthread_sigmask(SIG_SETMASK, NULL, &sigmask);
843 OSThread *osthread = thread->osthread();
844 osthread->set_caller_sigmask(sigmask);
845
846 pthread_sigmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL);
847 if (!ReduceSignalUsage) {
848 if (thread->is_VM_thread()) {
849 // Only the VM thread handles BREAK_SIGNAL ...
850 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
851 } else {
852 // ... all other threads block BREAK_SIGNAL
853 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked");
854 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
855 }
856 }
857 }
858
create_attached_thread(JavaThread * thread)859 bool os::create_attached_thread(JavaThread* thread) {
860 #ifdef ASSERT
861 thread->verify_not_published();
862 #endif
863 OSThread* osthread = create_os_thread(thread, thr_self());
864 if (osthread == NULL) {
865 return false;
866 }
867
868 // Initial thread state is RUNNABLE
869 osthread->set_state(RUNNABLE);
870 thread->set_osthread(osthread);
871
872 // initialize signal mask for this thread
873 // and save the caller's signal mask
874 os::Solaris::hotspot_sigmask(thread);
875
876 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").",
877 os::current_thread_id());
878
879 return true;
880 }
881
create_main_thread(JavaThread * thread)882 bool os::create_main_thread(JavaThread* thread) {
883 #ifdef ASSERT
884 thread->verify_not_published();
885 #endif
886 if (_starting_thread == NULL) {
887 _starting_thread = create_os_thread(thread, main_thread);
888 if (_starting_thread == NULL) {
889 return false;
890 }
891 }
892
893 // The primodial thread is runnable from the start
894 _starting_thread->set_state(RUNNABLE);
895
896 thread->set_osthread(_starting_thread);
897
898 // initialize signal mask for this thread
899 // and save the caller's signal mask
900 os::Solaris::hotspot_sigmask(thread);
901
902 return true;
903 }
904
905 // Helper function to trace thread attributes, similar to os::Posix::describe_pthread_attr()
describe_thr_create_attributes(char * buf,size_t buflen,size_t stacksize,long flags)906 static char* describe_thr_create_attributes(char* buf, size_t buflen,
907 size_t stacksize, long flags) {
908 stringStream ss(buf, buflen);
909 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024);
910 ss.print("flags: ");
911 #define PRINT_FLAG(f) if (flags & f) ss.print( #f " ");
912 #define ALL(X) \
913 X(THR_SUSPENDED) \
914 X(THR_DETACHED) \
915 X(THR_BOUND) \
916 X(THR_NEW_LWP) \
917 X(THR_DAEMON)
918 ALL(PRINT_FLAG)
919 #undef ALL
920 #undef PRINT_FLAG
921 return buf;
922 }
923
924 // return default stack size for thr_type
default_stack_size(os::ThreadType thr_type)925 size_t os::Posix::default_stack_size(os::ThreadType thr_type) {
926 // default stack size when not specified by caller is 1M (2M for LP64)
927 size_t s = (BytesPerWord >> 2) * K * K;
928 return s;
929 }
930
create_thread(Thread * thread,ThreadType thr_type,size_t req_stack_size)931 bool os::create_thread(Thread* thread, ThreadType thr_type,
932 size_t req_stack_size) {
933 // Allocate the OSThread object
934 OSThread* osthread = new OSThread(NULL, NULL);
935 if (osthread == NULL) {
936 return false;
937 }
938
939 if (ThreadPriorityVerbose) {
940 char *thrtyp;
941 switch (thr_type) {
942 case vm_thread:
943 thrtyp = (char *)"vm";
944 break;
945 case cgc_thread:
946 thrtyp = (char *)"cgc";
947 break;
948 case pgc_thread:
949 thrtyp = (char *)"pgc";
950 break;
951 case java_thread:
952 thrtyp = (char *)"java";
953 break;
954 case compiler_thread:
955 thrtyp = (char *)"compiler";
956 break;
957 case watcher_thread:
958 thrtyp = (char *)"watcher";
959 break;
960 default:
961 thrtyp = (char *)"unknown";
962 break;
963 }
964 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp);
965 }
966
967 // calculate stack size if it's not specified by caller
968 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
969
970 // Initial state is ALLOCATED but not INITIALIZED
971 osthread->set_state(ALLOCATED);
972
973 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) {
974 // We got lots of threads. Check if we still have some address space left.
975 // Need to be at least 5Mb of unreserved address space. We do check by
976 // trying to reserve some.
977 const size_t VirtualMemoryBangSize = 20*K*K;
978 char* mem = os::reserve_memory(VirtualMemoryBangSize);
979 if (mem == NULL) {
980 delete osthread;
981 return false;
982 } else {
983 // Release the memory again
984 os::release_memory(mem, VirtualMemoryBangSize);
985 }
986 }
987
988 // Setup osthread because the child thread may need it.
989 thread->set_osthread(osthread);
990
991 // Create the Solaris thread
992 thread_t tid = 0;
993 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED;
994 int status;
995
996 // Mark that we don't have an lwp or thread id yet.
997 // In case we attempt to set the priority before the thread starts.
998 osthread->set_lwp_id(-1);
999 osthread->set_thread_id(-1);
1000
1001 status = thr_create(NULL, stack_size, thread_native_entry, thread, flags, &tid);
1002
1003 char buf[64];
1004 if (status == 0) {
1005 log_info(os, thread)("Thread started (tid: " UINTX_FORMAT ", attributes: %s). ",
1006 (uintx) tid, describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags));
1007 } else {
1008 log_warning(os, thread)("Failed to start thread - thr_create failed (%s) for attributes: %s.",
1009 os::errno_name(status), describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags));
1010 // Log some OS information which might explain why creating the thread failed.
1011 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads());
1012 LogStream st(Log(os, thread)::info());
1013 os::Posix::print_rlimit_info(&st);
1014 os::print_memory_info(&st);
1015 }
1016
1017 if (status != 0) {
1018 thread->set_osthread(NULL);
1019 // Need to clean up stuff we've allocated so far
1020 delete osthread;
1021 return false;
1022 }
1023
1024 Atomic::inc(&os::Solaris::_os_thread_count);
1025
1026 // Store info on the Solaris thread into the OSThread
1027 osthread->set_thread_id(tid);
1028
1029 // Remember that we created this thread so we can set priority on it
1030 osthread->set_vm_created();
1031
1032 // Most thread types will set an explicit priority before starting the thread,
1033 // but for those that don't we need a valid value to read back in thread_native_entry.
1034 osthread->set_native_priority(NormPriority);
1035
1036 // Initial thread state is INITIALIZED, not SUSPENDED
1037 osthread->set_state(INITIALIZED);
1038
1039 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
1040 return true;
1041 }
1042
1043 debug_only(static bool signal_sets_initialized = false);
1044 static sigset_t unblocked_sigs, vm_sigs;
1045
signal_sets_init()1046 void os::Solaris::signal_sets_init() {
1047 // Should also have an assertion stating we are still single-threaded.
1048 assert(!signal_sets_initialized, "Already initialized");
1049 // Fill in signals that are necessarily unblocked for all threads in
1050 // the VM. Currently, we unblock the following signals:
1051 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
1052 // by -Xrs (=ReduceSignalUsage));
1053 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
1054 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
1055 // the dispositions or masks wrt these signals.
1056 // Programs embedding the VM that want to use the above signals for their
1057 // own purposes must, at this time, use the "-Xrs" option to prevent
1058 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
1059 // (See bug 4345157, and other related bugs).
1060 // In reality, though, unblocking these signals is really a nop, since
1061 // these signals are not blocked by default.
1062 sigemptyset(&unblocked_sigs);
1063 sigaddset(&unblocked_sigs, SIGILL);
1064 sigaddset(&unblocked_sigs, SIGSEGV);
1065 sigaddset(&unblocked_sigs, SIGBUS);
1066 sigaddset(&unblocked_sigs, SIGFPE);
1067 sigaddset(&unblocked_sigs, ASYNC_SIGNAL);
1068
1069 if (!ReduceSignalUsage) {
1070 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
1071 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
1072 }
1073 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
1074 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
1075 }
1076 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
1077 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
1078 }
1079 }
1080 // Fill in signals that are blocked by all but the VM thread.
1081 sigemptyset(&vm_sigs);
1082 if (!ReduceSignalUsage) {
1083 sigaddset(&vm_sigs, BREAK_SIGNAL);
1084 }
1085 debug_only(signal_sets_initialized = true);
1086
1087 // For diagnostics only used in run_periodic_checks
1088 sigemptyset(&check_signal_done);
1089 }
1090
1091 // These are signals that are unblocked while a thread is running Java.
1092 // (For some reason, they get blocked by default.)
unblocked_signals()1093 sigset_t* os::Solaris::unblocked_signals() {
1094 assert(signal_sets_initialized, "Not initialized");
1095 return &unblocked_sigs;
1096 }
1097
1098 // These are the signals that are blocked while a (non-VM) thread is
1099 // running Java. Only the VM thread handles these signals.
vm_signals()1100 sigset_t* os::Solaris::vm_signals() {
1101 assert(signal_sets_initialized, "Not initialized");
1102 return &vm_sigs;
1103 }
1104
1105 // CR 7190089: on Solaris, primordial thread's stack needs adjusting.
1106 // Without the adjustment, stack size is incorrect if stack is set to unlimited (ulimit -s unlimited).
correct_stack_boundaries_for_primordial_thread(Thread * thr)1107 void os::Solaris::correct_stack_boundaries_for_primordial_thread(Thread* thr) {
1108 assert(is_primordial_thread(), "Call only for primordial thread");
1109
1110 JavaThread* jt = (JavaThread *)thr;
1111 assert(jt != NULL, "Sanity check");
1112 size_t stack_size;
1113 address base = jt->stack_base();
1114 if (Arguments::created_by_java_launcher()) {
1115 // Use 2MB to allow for Solaris 7 64 bit mode.
1116 stack_size = JavaThread::stack_size_at_create() == 0
1117 ? 2048*K : JavaThread::stack_size_at_create();
1118
1119 // There are rare cases when we may have already used more than
1120 // the basic stack size allotment before this method is invoked.
1121 // Attempt to allow for a normally sized java_stack.
1122 size_t current_stack_offset = (size_t)(base - (address)&stack_size);
1123 stack_size += ReservedSpace::page_align_size_down(current_stack_offset);
1124 } else {
1125 // 6269555: If we were not created by a Java launcher, i.e. if we are
1126 // running embedded in a native application, treat the primordial thread
1127 // as much like a native attached thread as possible. This means using
1128 // the current stack size from thr_stksegment(), unless it is too large
1129 // to reliably setup guard pages. A reasonable max size is 8MB.
1130 size_t current_size = os::current_stack_size();
1131 // This should never happen, but just in case....
1132 if (current_size == 0) current_size = 2 * K * K;
1133 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size;
1134 }
1135 address bottom = align_up(base - stack_size, os::vm_page_size());;
1136 stack_size = (size_t)(base - bottom);
1137
1138 assert(stack_size > 0, "Stack size calculation problem");
1139
1140 if (stack_size > jt->stack_size()) {
1141 #ifndef PRODUCT
1142 struct rlimit limits;
1143 getrlimit(RLIMIT_STACK, &limits);
1144 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur);
1145 assert(size >= jt->stack_size(), "Stack size problem in main thread");
1146 #endif
1147 tty->print_cr("Stack size of %d Kb exceeds current limit of %d Kb.\n"
1148 "(Stack sizes are rounded up to a multiple of the system page size.)\n"
1149 "See limit(1) to increase the stack size limit.",
1150 stack_size / K, jt->stack_size() / K);
1151 vm_exit(1);
1152 }
1153 assert(jt->stack_size() >= stack_size,
1154 "Attempt to map more stack than was allocated");
1155 jt->set_stack_size(stack_size);
1156
1157 }
1158
1159
1160
1161 // Free Solaris resources related to the OSThread
free_thread(OSThread * osthread)1162 void os::free_thread(OSThread* osthread) {
1163 assert(osthread != NULL, "os::free_thread but osthread not set");
1164
1165 // We are told to free resources of the argument thread,
1166 // but we can only really operate on the current thread.
1167 assert(Thread::current()->osthread() == osthread,
1168 "os::free_thread but not current thread");
1169
1170 // Restore caller's signal mask
1171 sigset_t sigmask = osthread->caller_sigmask();
1172 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1173
1174 delete osthread;
1175 }
1176
pd_start_thread(Thread * thread)1177 void os::pd_start_thread(Thread* thread) {
1178 int status = thr_continue(thread->osthread()->thread_id());
1179 assert_status(status == 0, status, "thr_continue failed");
1180 }
1181
1182
current_thread_id()1183 intx os::current_thread_id() {
1184 return (intx)thr_self();
1185 }
1186
1187 static pid_t _initial_pid = 0;
1188
current_process_id()1189 int os::current_process_id() {
1190 return (int)(_initial_pid ? _initial_pid : getpid());
1191 }
1192
1193 // gethrtime() should be monotonic according to the documentation,
1194 // but some virtualized platforms are known to break this guarantee.
1195 // getTimeNanos() must be guaranteed not to move backwards, so we
1196 // are forced to add a check here.
getTimeNanos()1197 inline hrtime_t getTimeNanos() {
1198 const hrtime_t now = gethrtime();
1199 const hrtime_t prev = max_hrtime;
1200 if (now <= prev) {
1201 return prev; // same or retrograde time;
1202 }
1203 const hrtime_t obsv = Atomic::cmpxchg(now, &max_hrtime, prev);
1204 assert(obsv >= prev, "invariant"); // Monotonicity
1205 // If the CAS succeeded then we're done and return "now".
1206 // If the CAS failed and the observed value "obsv" is >= now then
1207 // we should return "obsv". If the CAS failed and now > obsv > prv then
1208 // some other thread raced this thread and installed a new value, in which case
1209 // we could either (a) retry the entire operation, (b) retry trying to install now
1210 // or (c) just return obsv. We use (c). No loop is required although in some cases
1211 // we might discard a higher "now" value in deference to a slightly lower but freshly
1212 // installed obsv value. That's entirely benign -- it admits no new orderings compared
1213 // to (a) or (b) -- and greatly reduces coherence traffic.
1214 // We might also condition (c) on the magnitude of the delta between obsv and now.
1215 // Avoiding excessive CAS operations to hot RW locations is critical.
1216 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
1217 return (prev == obsv) ? now : obsv;
1218 }
1219
1220 // Time since start-up in seconds to a fine granularity.
1221 // Used by VMSelfDestructTimer and the MemProfiler.
elapsedTime()1222 double os::elapsedTime() {
1223 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz;
1224 }
1225
elapsed_counter()1226 jlong os::elapsed_counter() {
1227 return (jlong)(getTimeNanos() - first_hrtime);
1228 }
1229
elapsed_frequency()1230 jlong os::elapsed_frequency() {
1231 return hrtime_hz;
1232 }
1233
1234 // Return the real, user, and system times in seconds from an
1235 // arbitrary fixed point in the past.
getTimesSecs(double * process_real_time,double * process_user_time,double * process_system_time)1236 bool os::getTimesSecs(double* process_real_time,
1237 double* process_user_time,
1238 double* process_system_time) {
1239 struct tms ticks;
1240 clock_t real_ticks = times(&ticks);
1241
1242 if (real_ticks == (clock_t) (-1)) {
1243 return false;
1244 } else {
1245 double ticks_per_second = (double) clock_tics_per_sec;
1246 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1247 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1248 // For consistency return the real time from getTimeNanos()
1249 // converted to seconds.
1250 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS);
1251
1252 return true;
1253 }
1254 }
1255
supports_vtime()1256 bool os::supports_vtime() { return true; }
enable_vtime()1257 bool os::enable_vtime() { return false; }
vtime_enabled()1258 bool os::vtime_enabled() { return false; }
1259
elapsedVTime()1260 double os::elapsedVTime() {
1261 return (double)gethrvtime() / (double)hrtime_hz;
1262 }
1263
1264 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
javaTimeMillis()1265 jlong os::javaTimeMillis() {
1266 timeval t;
1267 if (gettimeofday(&t, NULL) == -1) {
1268 fatal("os::javaTimeMillis: gettimeofday (%s)", os::strerror(errno));
1269 }
1270 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000;
1271 }
1272
1273 // Must return seconds+nanos since Jan 1 1970. This must use the same
1274 // time source as javaTimeMillis and can't use get_nsec_fromepoch as
1275 // we need better than 1ms accuracy
javaTimeSystemUTC(jlong & seconds,jlong & nanos)1276 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1277 timeval t;
1278 if (gettimeofday(&t, NULL) == -1) {
1279 fatal("os::javaTimeSystemUTC: gettimeofday (%s)", os::strerror(errno));
1280 }
1281 seconds = jlong(t.tv_sec);
1282 nanos = jlong(t.tv_usec) * 1000;
1283 }
1284
1285
javaTimeNanos()1286 jlong os::javaTimeNanos() {
1287 return (jlong)getTimeNanos();
1288 }
1289
javaTimeNanos_info(jvmtiTimerInfo * info_ptr)1290 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1291 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits
1292 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1293 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1294 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1295 }
1296
local_time_string(char * buf,size_t buflen)1297 char * os::local_time_string(char *buf, size_t buflen) {
1298 struct tm t;
1299 time_t long_time;
1300 time(&long_time);
1301 localtime_r(&long_time, &t);
1302 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1303 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1304 t.tm_hour, t.tm_min, t.tm_sec);
1305 return buf;
1306 }
1307
1308 // Note: os::shutdown() might be called very early during initialization, or
1309 // called from signal handler. Before adding something to os::shutdown(), make
1310 // sure it is async-safe and can handle partially initialized VM.
shutdown()1311 void os::shutdown() {
1312
1313 // allow PerfMemory to attempt cleanup of any persistent resources
1314 perfMemory_exit();
1315
1316 // needs to remove object in file system
1317 AttachListener::abort();
1318
1319 // flush buffered output, finish log files
1320 ostream_abort();
1321
1322 // Check for abort hook
1323 abort_hook_t abort_hook = Arguments::abort_hook();
1324 if (abort_hook != NULL) {
1325 abort_hook();
1326 }
1327 }
1328
1329 // Note: os::abort() might be called very early during initialization, or
1330 // called from signal handler. Before adding something to os::abort(), make
1331 // sure it is async-safe and can handle partially initialized VM.
abort(bool dump_core,void * siginfo,const void * context)1332 void os::abort(bool dump_core, void* siginfo, const void* context) {
1333 os::shutdown();
1334 if (dump_core) {
1335 #ifndef PRODUCT
1336 fdStream out(defaultStream::output_fd());
1337 out.print_raw("Current thread is ");
1338 char buf[16];
1339 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1340 out.print_raw_cr(buf);
1341 out.print_raw_cr("Dumping core ...");
1342 #endif
1343 ::abort(); // dump core (for debugging)
1344 }
1345
1346 ::exit(1);
1347 }
1348
1349 // Die immediately, no exit hook, no abort hook, no cleanup.
1350 // Dump a core file, if possible, for debugging.
die()1351 void os::die() {
1352 if (TestUnresponsiveErrorHandler && !CreateCoredumpOnCrash) {
1353 // For TimeoutInErrorHandlingTest.java, we just kill the VM
1354 // and don't take the time to generate a core file.
1355 os::signal_raise(SIGKILL);
1356 } else {
1357 ::abort();
1358 }
1359 }
1360
1361 // DLL functions
1362
dll_file_extension()1363 const char* os::dll_file_extension() { return ".so"; }
1364
1365 // This must be hard coded because it's the system's temporary
1366 // directory not the java application's temp directory, ala java.io.tmpdir.
get_temp_directory()1367 const char* os::get_temp_directory() { return "/tmp"; }
1368
1369 // check if addr is inside libjvm.so
address_is_in_vm(address addr)1370 bool os::address_is_in_vm(address addr) {
1371 static address libjvm_base_addr;
1372 Dl_info dlinfo;
1373
1374 if (libjvm_base_addr == NULL) {
1375 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1376 libjvm_base_addr = (address)dlinfo.dli_fbase;
1377 }
1378 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1379 }
1380
1381 if (dladdr((void *)addr, &dlinfo) != 0) {
1382 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1383 }
1384
1385 return false;
1386 }
1387
1388 typedef int (*dladdr1_func_type)(void *, Dl_info *, void **, int);
1389 static dladdr1_func_type dladdr1_func = NULL;
1390
dll_address_to_function_name(address addr,char * buf,int buflen,int * offset,bool demangle)1391 bool os::dll_address_to_function_name(address addr, char *buf,
1392 int buflen, int * offset,
1393 bool demangle) {
1394 // buf is not optional, but offset is optional
1395 assert(buf != NULL, "sanity check");
1396
1397 Dl_info dlinfo;
1398
1399 // dladdr1_func was initialized in os::init()
1400 if (dladdr1_func != NULL) {
1401 // yes, we have dladdr1
1402
1403 // Support for dladdr1 is checked at runtime; it may be
1404 // available even if the vm is built on a machine that does
1405 // not have dladdr1 support. Make sure there is a value for
1406 // RTLD_DL_SYMENT.
1407 #ifndef RTLD_DL_SYMENT
1408 #define RTLD_DL_SYMENT 1
1409 #endif
1410 #ifdef _LP64
1411 Elf64_Sym * info;
1412 #else
1413 Elf32_Sym * info;
1414 #endif
1415 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info,
1416 RTLD_DL_SYMENT) != 0) {
1417 // see if we have a matching symbol that covers our address
1418 if (dlinfo.dli_saddr != NULL &&
1419 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) {
1420 if (dlinfo.dli_sname != NULL) {
1421 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1422 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1423 }
1424 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1425 return true;
1426 }
1427 }
1428 // no matching symbol so try for just file info
1429 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1430 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1431 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1432 return true;
1433 }
1434 }
1435 }
1436 buf[0] = '\0';
1437 if (offset != NULL) *offset = -1;
1438 return false;
1439 }
1440
1441 // no, only dladdr is available
1442 if (dladdr((void *)addr, &dlinfo) != 0) {
1443 // see if we have a matching symbol
1444 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1445 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1446 jio_snprintf(buf, buflen, dlinfo.dli_sname);
1447 }
1448 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1449 return true;
1450 }
1451 // no matching symbol so try for just file info
1452 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1453 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1454 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1455 return true;
1456 }
1457 }
1458 }
1459 buf[0] = '\0';
1460 if (offset != NULL) *offset = -1;
1461 return false;
1462 }
1463
dll_address_to_library_name(address addr,char * buf,int buflen,int * offset)1464 bool os::dll_address_to_library_name(address addr, char* buf,
1465 int buflen, int* offset) {
1466 // buf is not optional, but offset is optional
1467 assert(buf != NULL, "sanity check");
1468
1469 Dl_info dlinfo;
1470
1471 if (dladdr((void*)addr, &dlinfo) != 0) {
1472 if (dlinfo.dli_fname != NULL) {
1473 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1474 }
1475 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1476 *offset = addr - (address)dlinfo.dli_fbase;
1477 }
1478 return true;
1479 }
1480
1481 buf[0] = '\0';
1482 if (offset) *offset = -1;
1483 return false;
1484 }
1485
get_loaded_modules_info(os::LoadedModulesCallbackFunc callback,void * param)1486 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1487 Dl_info dli;
1488 // Sanity check?
1489 if (dladdr(CAST_FROM_FN_PTR(void *, os::get_loaded_modules_info), &dli) == 0 ||
1490 dli.dli_fname == NULL) {
1491 return 1;
1492 }
1493
1494 void * handle = dlopen(dli.dli_fname, RTLD_LAZY);
1495 if (handle == NULL) {
1496 return 1;
1497 }
1498
1499 Link_map *map;
1500 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1501 if (map == NULL) {
1502 dlclose(handle);
1503 return 1;
1504 }
1505
1506 while (map->l_prev != NULL) {
1507 map = map->l_prev;
1508 }
1509
1510 while (map != NULL) {
1511 // Iterate through all map entries and call callback with fields of interest
1512 if(callback(map->l_name, (address)map->l_addr, (address)0, param)) {
1513 dlclose(handle);
1514 return 1;
1515 }
1516 map = map->l_next;
1517 }
1518
1519 dlclose(handle);
1520 return 0;
1521 }
1522
_print_dll_info_cb(const char * name,address base_address,address top_address,void * param)1523 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) {
1524 outputStream * out = (outputStream *) param;
1525 out->print_cr(PTR_FORMAT " \t%s", base_address, name);
1526 return 0;
1527 }
1528
print_dll_info(outputStream * st)1529 void os::print_dll_info(outputStream * st) {
1530 st->print_cr("Dynamic libraries:"); st->flush();
1531 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) {
1532 st->print_cr("Error: Cannot print dynamic libraries.");
1533 }
1534 }
1535
1536 // Loads .dll/.so and
1537 // in case of error it checks if .dll/.so was built for the
1538 // same architecture as Hotspot is running on
1539
dll_load(const char * filename,char * ebuf,int ebuflen)1540 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1541 log_info(os)("attempting shared library load of %s", filename);
1542
1543 void * result= ::dlopen(filename, RTLD_LAZY);
1544 if (result != NULL) {
1545 // Successful loading
1546 Events::log(NULL, "Loaded shared library %s", filename);
1547 log_info(os)("shared library load of %s was successful", filename);
1548 return result;
1549 }
1550
1551 Elf32_Ehdr elf_head;
1552 const char* error_report = ::dlerror();
1553 if (error_report == NULL) {
1554 error_report = "dlerror returned no error description";
1555 }
1556 if (ebuf != NULL && ebuflen > 0) {
1557 ::strncpy(ebuf, error_report, ebuflen-1);
1558 ebuf[ebuflen-1]='\0';
1559 }
1560
1561 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report);
1562 log_info(os)("shared library load of %s failed, %s", filename, error_report);
1563
1564 int diag_msg_max_length=ebuflen-strlen(ebuf);
1565 char* diag_msg_buf=ebuf+strlen(ebuf);
1566
1567 if (diag_msg_max_length==0) {
1568 // No more space in ebuf for additional diagnostics message
1569 return NULL;
1570 }
1571
1572
1573 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1574
1575 if (file_descriptor < 0) {
1576 // Can't open library, report dlerror() message
1577 return NULL;
1578 }
1579
1580 bool failed_to_read_elf_head=
1581 (sizeof(elf_head)!=
1582 (::read(file_descriptor, &elf_head,sizeof(elf_head))));
1583
1584 ::close(file_descriptor);
1585 if (failed_to_read_elf_head) {
1586 // file i/o error - report dlerror() msg
1587 return NULL;
1588 }
1589
1590 typedef struct {
1591 Elf32_Half code; // Actual value as defined in elf.h
1592 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1593 char elf_class; // 32 or 64 bit
1594 char endianess; // MSB or LSB
1595 char* name; // String representation
1596 } arch_t;
1597
1598 static const arch_t arch_array[]={
1599 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1600 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1601 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1602 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1603 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1604 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1605 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1606 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1607 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1608 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"}
1609 };
1610
1611 #if (defined IA32)
1612 static Elf32_Half running_arch_code=EM_386;
1613 #elif (defined AMD64)
1614 static Elf32_Half running_arch_code=EM_X86_64;
1615 #elif (defined IA64)
1616 static Elf32_Half running_arch_code=EM_IA_64;
1617 #elif (defined __sparc) && (defined _LP64)
1618 static Elf32_Half running_arch_code=EM_SPARCV9;
1619 #elif (defined __sparc) && (!defined _LP64)
1620 static Elf32_Half running_arch_code=EM_SPARC;
1621 #elif (defined __powerpc64__)
1622 static Elf32_Half running_arch_code=EM_PPC64;
1623 #elif (defined __powerpc__)
1624 static Elf32_Half running_arch_code=EM_PPC;
1625 #elif (defined ARM)
1626 static Elf32_Half running_arch_code=EM_ARM;
1627 #else
1628 #error Method os::dll_load requires that one of following is defined:\
1629 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM
1630 #endif
1631
1632 // Identify compatability class for VM's architecture and library's architecture
1633 // Obtain string descriptions for architectures
1634
1635 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1636 int running_arch_index=-1;
1637
1638 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) {
1639 if (running_arch_code == arch_array[i].code) {
1640 running_arch_index = i;
1641 }
1642 if (lib_arch.code == arch_array[i].code) {
1643 lib_arch.compat_class = arch_array[i].compat_class;
1644 lib_arch.name = arch_array[i].name;
1645 }
1646 }
1647
1648 assert(running_arch_index != -1,
1649 "Didn't find running architecture code (running_arch_code) in arch_array");
1650 if (running_arch_index == -1) {
1651 // Even though running architecture detection failed
1652 // we may still continue with reporting dlerror() message
1653 return NULL;
1654 }
1655
1656 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1657 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1658 return NULL;
1659 }
1660
1661 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1662 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1663 return NULL;
1664 }
1665
1666 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1667 if (lib_arch.name!=NULL) {
1668 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1669 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1670 lib_arch.name, arch_array[running_arch_index].name);
1671 } else {
1672 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1673 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1674 lib_arch.code,
1675 arch_array[running_arch_index].name);
1676 }
1677 }
1678
1679 return NULL;
1680 }
1681
dll_lookup(void * handle,const char * name)1682 void* os::dll_lookup(void* handle, const char* name) {
1683 return dlsym(handle, name);
1684 }
1685
get_default_process_handle()1686 void* os::get_default_process_handle() {
1687 return (void*)::dlopen(NULL, RTLD_LAZY);
1688 }
1689
get_mtime(const char * filename)1690 static inline time_t get_mtime(const char* filename) {
1691 struct stat st;
1692 int ret = os::stat(filename, &st);
1693 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
1694 return st.st_mtime;
1695 }
1696
compare_file_modified_times(const char * file1,const char * file2)1697 int os::compare_file_modified_times(const char* file1, const char* file2) {
1698 time_t t1 = get_mtime(file1);
1699 time_t t2 = get_mtime(file2);
1700 return t1 - t2;
1701 }
1702
_print_ascii_file(const char * filename,outputStream * st)1703 static bool _print_ascii_file(const char* filename, outputStream* st) {
1704 int fd = ::open(filename, O_RDONLY);
1705 if (fd == -1) {
1706 return false;
1707 }
1708
1709 char buf[32];
1710 int bytes;
1711 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
1712 st->print_raw(buf, bytes);
1713 }
1714
1715 ::close(fd);
1716
1717 return true;
1718 }
1719
print_os_info_brief(outputStream * st)1720 void os::print_os_info_brief(outputStream* st) {
1721 os::Solaris::print_distro_info(st);
1722
1723 os::Posix::print_uname_info(st);
1724
1725 os::Solaris::print_libversion_info(st);
1726 }
1727
print_os_info(outputStream * st)1728 void os::print_os_info(outputStream* st) {
1729 st->print("OS:");
1730
1731 os::Solaris::print_distro_info(st);
1732
1733 os::Posix::print_uname_info(st);
1734
1735 os::Posix::print_uptime_info(st);
1736
1737 os::Solaris::print_libversion_info(st);
1738
1739 os::Posix::print_rlimit_info(st);
1740
1741 os::Posix::print_load_average(st);
1742 }
1743
print_distro_info(outputStream * st)1744 void os::Solaris::print_distro_info(outputStream* st) {
1745 if (!_print_ascii_file("/etc/release", st)) {
1746 st->print("Solaris");
1747 }
1748 st->cr();
1749 }
1750
get_summary_os_info(char * buf,size_t buflen)1751 void os::get_summary_os_info(char* buf, size_t buflen) {
1752 strncpy(buf, "Solaris", buflen); // default to plain solaris
1753 FILE* fp = fopen("/etc/release", "r");
1754 if (fp != NULL) {
1755 char tmp[256];
1756 // Only get the first line and chop out everything but the os name.
1757 if (fgets(tmp, sizeof(tmp), fp)) {
1758 char* ptr = tmp;
1759 // skip past whitespace characters
1760 while (*ptr != '\0' && (*ptr == ' ' || *ptr == '\t' || *ptr == '\n')) ptr++;
1761 if (*ptr != '\0') {
1762 char* nl = strchr(ptr, '\n');
1763 if (nl != NULL) *nl = '\0';
1764 strncpy(buf, ptr, buflen);
1765 }
1766 }
1767 fclose(fp);
1768 }
1769 }
1770
print_libversion_info(outputStream * st)1771 void os::Solaris::print_libversion_info(outputStream* st) {
1772 st->print(" (T2 libthread)");
1773 st->cr();
1774 }
1775
check_addr0(outputStream * st)1776 static bool check_addr0(outputStream* st) {
1777 jboolean status = false;
1778 const int read_chunk = 200;
1779 int ret = 0;
1780 int nmap = 0;
1781 int fd = ::open("/proc/self/map",O_RDONLY);
1782 if (fd >= 0) {
1783 prmap_t *p = NULL;
1784 char *mbuff = (char *) calloc(read_chunk, sizeof(prmap_t));
1785 if (NULL == mbuff) {
1786 ::close(fd);
1787 return status;
1788 }
1789 while ((ret = ::read(fd, mbuff, read_chunk*sizeof(prmap_t))) > 0) {
1790 //check if read() has not read partial data
1791 if( 0 != ret % sizeof(prmap_t)){
1792 break;
1793 }
1794 nmap = ret / sizeof(prmap_t);
1795 p = (prmap_t *)mbuff;
1796 for(int i = 0; i < nmap; i++){
1797 if (p->pr_vaddr == 0x0) {
1798 st->print("Warning: Address: " PTR_FORMAT ", Size: " SIZE_FORMAT "K, ",p->pr_vaddr, p->pr_size/1024);
1799 st->print("Mapped file: %s, ", p->pr_mapname[0] == '\0' ? "None" : p->pr_mapname);
1800 st->print("Access: ");
1801 st->print("%s",(p->pr_mflags & MA_READ) ? "r" : "-");
1802 st->print("%s",(p->pr_mflags & MA_WRITE) ? "w" : "-");
1803 st->print("%s",(p->pr_mflags & MA_EXEC) ? "x" : "-");
1804 st->cr();
1805 status = true;
1806 }
1807 p++;
1808 }
1809 }
1810 free(mbuff);
1811 ::close(fd);
1812 }
1813 return status;
1814 }
1815
get_summary_cpu_info(char * buf,size_t buflen)1816 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1817 // Get MHz with system call. We don't seem to already have this.
1818 processor_info_t stats;
1819 processorid_t id = getcpuid();
1820 int clock = 0;
1821 if (processor_info(id, &stats) != -1) {
1822 clock = stats.pi_clock; // pi_processor_type isn't more informative than below
1823 }
1824 #ifdef AMD64
1825 snprintf(buf, buflen, "x86 64 bit %d MHz", clock);
1826 #else
1827 // must be sparc
1828 snprintf(buf, buflen, "Sparcv9 64 bit %d MHz", clock);
1829 #endif
1830 }
1831
pd_print_cpu_info(outputStream * st,char * buf,size_t buflen)1832 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1833 // Nothing to do for now.
1834 }
1835
print_memory_info(outputStream * st)1836 void os::print_memory_info(outputStream* st) {
1837 st->print("Memory:");
1838 st->print(" %dk page", os::vm_page_size()>>10);
1839 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10);
1840 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10);
1841 st->cr();
1842 (void) check_addr0(st);
1843 }
1844
1845 // Moved from whole group, because we need them here for diagnostic
1846 // prints.
1847 static int Maxsignum = 0;
1848 static int *ourSigFlags = NULL;
1849
get_our_sigflags(int sig)1850 int os::Solaris::get_our_sigflags(int sig) {
1851 assert(ourSigFlags!=NULL, "signal data structure not initialized");
1852 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
1853 return ourSigFlags[sig];
1854 }
1855
set_our_sigflags(int sig,int flags)1856 void os::Solaris::set_our_sigflags(int sig, int flags) {
1857 assert(ourSigFlags!=NULL, "signal data structure not initialized");
1858 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
1859 ourSigFlags[sig] = flags;
1860 }
1861
1862
get_signal_handler_name(address handler,char * buf,int buflen)1863 static const char* get_signal_handler_name(address handler,
1864 char* buf, int buflen) {
1865 int offset;
1866 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
1867 if (found) {
1868 // skip directory names
1869 const char *p1, *p2;
1870 p1 = buf;
1871 size_t len = strlen(os::file_separator());
1872 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
1873 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
1874 } else {
1875 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
1876 }
1877 return buf;
1878 }
1879
print_signal_handler(outputStream * st,int sig,char * buf,size_t buflen)1880 static void print_signal_handler(outputStream* st, int sig,
1881 char* buf, size_t buflen) {
1882 struct sigaction sa;
1883
1884 sigaction(sig, NULL, &sa);
1885
1886 st->print("%s: ", os::exception_name(sig, buf, buflen));
1887
1888 address handler = (sa.sa_flags & SA_SIGINFO)
1889 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
1890 : CAST_FROM_FN_PTR(address, sa.sa_handler);
1891
1892 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
1893 st->print("SIG_DFL");
1894 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
1895 st->print("SIG_IGN");
1896 } else {
1897 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
1898 }
1899
1900 st->print(", sa_mask[0]=");
1901 os::Posix::print_signal_set_short(st, &sa.sa_mask);
1902
1903 address rh = VMError::get_resetted_sighandler(sig);
1904 // May be, handler was resetted by VMError?
1905 if (rh != NULL) {
1906 handler = rh;
1907 sa.sa_flags = VMError::get_resetted_sigflags(sig);
1908 }
1909
1910 st->print(", sa_flags=");
1911 os::Posix::print_sa_flags(st, sa.sa_flags);
1912
1913 // Check: is it our handler?
1914 if (handler == CAST_FROM_FN_PTR(address, signalHandler)) {
1915 // It is our signal handler
1916 // check for flags
1917 if (sa.sa_flags != os::Solaris::get_our_sigflags(sig)) {
1918 st->print(
1919 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
1920 os::Solaris::get_our_sigflags(sig));
1921 }
1922 }
1923 st->cr();
1924 }
1925
print_signal_handlers(outputStream * st,char * buf,size_t buflen)1926 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1927 st->print_cr("Signal Handlers:");
1928 print_signal_handler(st, SIGSEGV, buf, buflen);
1929 print_signal_handler(st, SIGBUS , buf, buflen);
1930 print_signal_handler(st, SIGFPE , buf, buflen);
1931 print_signal_handler(st, SIGPIPE, buf, buflen);
1932 print_signal_handler(st, SIGXFSZ, buf, buflen);
1933 print_signal_handler(st, SIGILL , buf, buflen);
1934 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen);
1935 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1936 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen);
1937 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1938 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen);
1939 }
1940
1941 static char saved_jvm_path[MAXPATHLEN] = { 0 };
1942
1943 // Find the full path to the current module, libjvm.so
jvm_path(char * buf,jint buflen)1944 void os::jvm_path(char *buf, jint buflen) {
1945 // Error checking.
1946 if (buflen < MAXPATHLEN) {
1947 assert(false, "must use a large-enough buffer");
1948 buf[0] = '\0';
1949 return;
1950 }
1951 // Lazy resolve the path to current module.
1952 if (saved_jvm_path[0] != 0) {
1953 strcpy(buf, saved_jvm_path);
1954 return;
1955 }
1956
1957 Dl_info dlinfo;
1958 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1959 assert(ret != 0, "cannot locate libjvm");
1960 if (ret != 0 && dlinfo.dli_fname != NULL) {
1961 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) {
1962 return;
1963 }
1964 } else {
1965 buf[0] = '\0';
1966 return;
1967 }
1968
1969 if (Arguments::sun_java_launcher_is_altjvm()) {
1970 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1971 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so".
1972 // If "/jre/lib/" appears at the right place in the string, then
1973 // assume we are installed in a JDK and we're done. Otherwise, check
1974 // for a JAVA_HOME environment variable and fix up the path so it
1975 // looks like libjvm.so is installed there (append a fake suffix
1976 // hotspot/libjvm.so).
1977 const char *p = buf + strlen(buf) - 1;
1978 for (int count = 0; p > buf && count < 5; ++count) {
1979 for (--p; p > buf && *p != '/'; --p)
1980 /* empty */ ;
1981 }
1982
1983 if (strncmp(p, "/jre/lib/", 9) != 0) {
1984 // Look for JAVA_HOME in the environment.
1985 char* java_home_var = ::getenv("JAVA_HOME");
1986 if (java_home_var != NULL && java_home_var[0] != 0) {
1987 char* jrelib_p;
1988 int len;
1989
1990 // Check the current module name "libjvm.so".
1991 p = strrchr(buf, '/');
1992 assert(strstr(p, "/libjvm") == p, "invalid library name");
1993
1994 if (os::Posix::realpath(java_home_var, buf, buflen) == NULL) {
1995 return;
1996 }
1997 // determine if this is a legacy image or modules image
1998 // modules image doesn't have "jre" subdirectory
1999 len = strlen(buf);
2000 assert(len < buflen, "Ran out of buffer space");
2001 jrelib_p = buf + len;
2002 snprintf(jrelib_p, buflen-len, "/jre/lib");
2003 if (0 != access(buf, F_OK)) {
2004 snprintf(jrelib_p, buflen-len, "/lib");
2005 }
2006
2007 if (0 == access(buf, F_OK)) {
2008 // Use current module name "libjvm.so"
2009 len = strlen(buf);
2010 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
2011 } else {
2012 // Go back to path of .so
2013 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) {
2014 return;
2015 }
2016 }
2017 }
2018 }
2019 }
2020
2021 strncpy(saved_jvm_path, buf, MAXPATHLEN);
2022 saved_jvm_path[MAXPATHLEN - 1] = '\0';
2023 }
2024
2025
print_jni_name_prefix_on(outputStream * st,int args_size)2026 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
2027 // no prefix required, not even "_"
2028 }
2029
2030
print_jni_name_suffix_on(outputStream * st,int args_size)2031 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
2032 // no suffix required
2033 }
2034
2035 // This method is a copy of JDK's sysGetLastErrorString
2036 // from src/solaris/hpi/src/system_md.c
2037
lasterror(char * buf,size_t len)2038 size_t os::lasterror(char *buf, size_t len) {
2039 if (errno == 0) return 0;
2040
2041 const char *s = os::strerror(errno);
2042 size_t n = ::strlen(s);
2043 if (n >= len) {
2044 n = len - 1;
2045 }
2046 ::strncpy(buf, s, n);
2047 buf[n] = '\0';
2048 return n;
2049 }
2050
2051
2052 // sun.misc.Signal
2053
2054 extern "C" {
UserHandler(int sig,void * siginfo,void * context)2055 static void UserHandler(int sig, void *siginfo, void *context) {
2056 // Ctrl-C is pressed during error reporting, likely because the error
2057 // handler fails to abort. Let VM die immediately.
2058 if (sig == SIGINT && VMError::is_error_reported()) {
2059 os::die();
2060 }
2061
2062 os::signal_notify(sig);
2063 // We do not need to reinstate the signal handler each time...
2064 }
2065 }
2066
user_handler()2067 void* os::user_handler() {
2068 return CAST_FROM_FN_PTR(void*, UserHandler);
2069 }
2070
create_semaphore_timespec(unsigned int sec,int nsec)2071 static struct timespec create_semaphore_timespec(unsigned int sec, int nsec) {
2072 struct timespec ts;
2073 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
2074
2075 return ts;
2076 }
2077
2078 extern "C" {
2079 typedef void (*sa_handler_t)(int);
2080 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2081 }
2082
signal(int signal_number,void * handler)2083 void* os::signal(int signal_number, void* handler) {
2084 struct sigaction sigAct, oldSigAct;
2085 sigfillset(&(sigAct.sa_mask));
2086 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
2087 sigAct.sa_flags |= SA_SIGINFO;
2088 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2089
2090 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
2091 // -1 means registration failed
2092 return (void *)-1;
2093 }
2094
2095 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2096 }
2097
signal_raise(int signal_number)2098 void os::signal_raise(int signal_number) {
2099 raise(signal_number);
2100 }
2101
2102 // The following code is moved from os.cpp for making this
2103 // code platform specific, which it is by its very nature.
2104
2105 // a counter for each possible signal value
2106 static int Sigexit = 0;
2107 static jint *pending_signals = NULL;
2108 static int *preinstalled_sigs = NULL;
2109 static struct sigaction *chainedsigactions = NULL;
2110 static Semaphore* sig_sem = NULL;
2111
sigexitnum_pd()2112 int os::sigexitnum_pd() {
2113 assert(Sigexit > 0, "signal memory not yet initialized");
2114 return Sigexit;
2115 }
2116
init_signal_mem()2117 void os::Solaris::init_signal_mem() {
2118 // Initialize signal structures
2119 Maxsignum = SIGRTMAX;
2120 Sigexit = Maxsignum+1;
2121 assert(Maxsignum >0, "Unable to obtain max signal number");
2122
2123 // Initialize signal structures
2124 // pending_signals has one int per signal
2125 // The additional signal is for SIGEXIT - exit signal to signal_thread
2126 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal);
2127 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
2128
2129 if (UseSignalChaining) {
2130 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction)
2131 * (Maxsignum + 1), mtInternal);
2132 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1)));
2133 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2134 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1)));
2135 }
2136 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2137 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
2138 }
2139
jdk_misc_signal_init()2140 static void jdk_misc_signal_init() {
2141 // Initialize signal semaphore
2142 sig_sem = new Semaphore();
2143 }
2144
signal_notify(int sig)2145 void os::signal_notify(int sig) {
2146 if (sig_sem != NULL) {
2147 Atomic::inc(&pending_signals[sig]);
2148 sig_sem->signal();
2149 } else {
2150 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init
2151 // initialization isn't called.
2152 assert(ReduceSignalUsage, "signal semaphore should be created");
2153 }
2154 }
2155
check_pending_signals()2156 static int check_pending_signals() {
2157 int ret;
2158 while (true) {
2159 for (int i = 0; i < Sigexit + 1; i++) {
2160 jint n = pending_signals[i];
2161 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2162 return i;
2163 }
2164 }
2165 JavaThread *thread = JavaThread::current();
2166 ThreadBlockInVM tbivm(thread);
2167
2168 bool threadIsSuspended;
2169 do {
2170 thread->set_suspend_equivalent();
2171 sig_sem->wait();
2172
2173 // were we externally suspended while we were waiting?
2174 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2175 if (threadIsSuspended) {
2176 // The semaphore has been incremented, but while we were waiting
2177 // another thread suspended us. We don't want to continue running
2178 // while suspended because that would surprise the thread that
2179 // suspended us.
2180 sig_sem->signal();
2181
2182 thread->java_suspend_self();
2183 }
2184 } while (threadIsSuspended);
2185 }
2186 }
2187
signal_wait()2188 int os::signal_wait() {
2189 return check_pending_signals();
2190 }
2191
2192 ////////////////////////////////////////////////////////////////////////////////
2193 // Virtual Memory
2194
2195 static int page_size = -1;
2196
vm_page_size()2197 int os::vm_page_size() {
2198 assert(page_size != -1, "must call os::init");
2199 return page_size;
2200 }
2201
2202 // Solaris allocates memory by pages.
vm_allocation_granularity()2203 int os::vm_allocation_granularity() {
2204 assert(page_size != -1, "must call os::init");
2205 return page_size;
2206 }
2207
recoverable_mmap_error(int err)2208 static bool recoverable_mmap_error(int err) {
2209 // See if the error is one we can let the caller handle. This
2210 // list of errno values comes from the Solaris mmap(2) man page.
2211 switch (err) {
2212 case EBADF:
2213 case EINVAL:
2214 case ENOTSUP:
2215 // let the caller deal with these errors
2216 return true;
2217
2218 default:
2219 // Any remaining errors on this OS can cause our reserved mapping
2220 // to be lost. That can cause confusion where different data
2221 // structures think they have the same memory mapped. The worst
2222 // scenario is if both the VM and a library think they have the
2223 // same memory mapped.
2224 return false;
2225 }
2226 }
2227
warn_fail_commit_memory(char * addr,size_t bytes,bool exec,int err)2228 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec,
2229 int err) {
2230 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2231 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec,
2232 os::strerror(err), err);
2233 }
2234
warn_fail_commit_memory(char * addr,size_t bytes,size_t alignment_hint,bool exec,int err)2235 static void warn_fail_commit_memory(char* addr, size_t bytes,
2236 size_t alignment_hint, bool exec,
2237 int err) {
2238 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2239 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes,
2240 alignment_hint, exec, os::strerror(err), err);
2241 }
2242
commit_memory_impl(char * addr,size_t bytes,bool exec)2243 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) {
2244 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2245 size_t size = bytes;
2246 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2247 if (res != NULL) {
2248 if (UseNUMAInterleaving) {
2249 numa_make_global(addr, bytes);
2250 }
2251 return 0;
2252 }
2253
2254 int err = errno; // save errno from mmap() call in mmap_chunk()
2255
2256 if (!recoverable_mmap_error(err)) {
2257 warn_fail_commit_memory(addr, bytes, exec, err);
2258 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory.");
2259 }
2260
2261 return err;
2262 }
2263
pd_commit_memory(char * addr,size_t bytes,bool exec)2264 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
2265 return Solaris::commit_memory_impl(addr, bytes, exec) == 0;
2266 }
2267
pd_commit_memory_or_exit(char * addr,size_t bytes,bool exec,const char * mesg)2268 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec,
2269 const char* mesg) {
2270 assert(mesg != NULL, "mesg must be specified");
2271 int err = os::Solaris::commit_memory_impl(addr, bytes, exec);
2272 if (err != 0) {
2273 // the caller wants all commit errors to exit with the specified mesg:
2274 warn_fail_commit_memory(addr, bytes, exec, err);
2275 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg);
2276 }
2277 }
2278
page_size_for_alignment(size_t alignment)2279 size_t os::Solaris::page_size_for_alignment(size_t alignment) {
2280 assert(is_aligned(alignment, (size_t) vm_page_size()),
2281 SIZE_FORMAT " is not aligned to " SIZE_FORMAT,
2282 alignment, (size_t) vm_page_size());
2283
2284 for (int i = 0; _page_sizes[i] != 0; i++) {
2285 if (is_aligned(alignment, _page_sizes[i])) {
2286 return _page_sizes[i];
2287 }
2288 }
2289
2290 return (size_t) vm_page_size();
2291 }
2292
commit_memory_impl(char * addr,size_t bytes,size_t alignment_hint,bool exec)2293 int os::Solaris::commit_memory_impl(char* addr, size_t bytes,
2294 size_t alignment_hint, bool exec) {
2295 int err = Solaris::commit_memory_impl(addr, bytes, exec);
2296 if (err == 0 && UseLargePages && alignment_hint > 0) {
2297 assert(is_aligned(bytes, alignment_hint),
2298 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint);
2299
2300 // The syscall memcntl requires an exact page size (see man memcntl for details).
2301 size_t page_size = page_size_for_alignment(alignment_hint);
2302 if (page_size > (size_t) vm_page_size()) {
2303 (void)Solaris::setup_large_pages(addr, bytes, page_size);
2304 }
2305 }
2306 return err;
2307 }
2308
pd_commit_memory(char * addr,size_t bytes,size_t alignment_hint,bool exec)2309 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2310 bool exec) {
2311 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0;
2312 }
2313
pd_commit_memory_or_exit(char * addr,size_t bytes,size_t alignment_hint,bool exec,const char * mesg)2314 void os::pd_commit_memory_or_exit(char* addr, size_t bytes,
2315 size_t alignment_hint, bool exec,
2316 const char* mesg) {
2317 assert(mesg != NULL, "mesg must be specified");
2318 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec);
2319 if (err != 0) {
2320 // the caller wants all commit errors to exit with the specified mesg:
2321 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err);
2322 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg);
2323 }
2324 }
2325
2326 // Uncommit the pages in a specified region.
pd_free_memory(char * addr,size_t bytes,size_t alignment_hint)2327 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) {
2328 if (madvise(addr, bytes, MADV_FREE) < 0) {
2329 debug_only(warning("MADV_FREE failed."));
2330 return;
2331 }
2332 }
2333
pd_create_stack_guard_pages(char * addr,size_t size)2334 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2335 return os::commit_memory(addr, size, !ExecMem);
2336 }
2337
remove_stack_guard_pages(char * addr,size_t size)2338 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2339 return os::uncommit_memory(addr, size);
2340 }
2341
2342 // Change the page size in a given range.
pd_realign_memory(char * addr,size_t bytes,size_t alignment_hint)2343 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2344 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2345 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2346 if (UseLargePages) {
2347 size_t page_size = Solaris::page_size_for_alignment(alignment_hint);
2348 if (page_size > (size_t) vm_page_size()) {
2349 Solaris::setup_large_pages(addr, bytes, page_size);
2350 }
2351 }
2352 }
2353
2354 // Tell the OS to make the range local to the first-touching LWP
numa_make_local(char * addr,size_t bytes,int lgrp_hint)2355 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2356 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2357 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2358 debug_only(warning("MADV_ACCESS_LWP failed."));
2359 }
2360 }
2361
2362 // Tell the OS that this range would be accessed from different LWPs.
numa_make_global(char * addr,size_t bytes)2363 void os::numa_make_global(char *addr, size_t bytes) {
2364 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2365 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2366 debug_only(warning("MADV_ACCESS_MANY failed."));
2367 }
2368 }
2369
2370 // Get the number of the locality groups.
numa_get_groups_num()2371 size_t os::numa_get_groups_num() {
2372 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2373 return n != -1 ? n : 1;
2374 }
2375
2376 // Get a list of leaf locality groups. A leaf lgroup is group that
2377 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2378 // board. An LWP is assigned to one of these groups upon creation.
numa_get_leaf_groups(int * ids,size_t size)2379 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2380 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2381 ids[0] = 0;
2382 return 1;
2383 }
2384 int result_size = 0, top = 1, bottom = 0, cur = 0;
2385 for (int k = 0; k < size; k++) {
2386 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2387 (Solaris::lgrp_id_t*)&ids[top], size - top);
2388 if (r == -1) {
2389 ids[0] = 0;
2390 return 1;
2391 }
2392 if (!r) {
2393 // That's a leaf node.
2394 assert(bottom <= cur, "Sanity check");
2395 // Check if the node has memory
2396 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2397 NULL, 0, LGRP_RSRC_MEM) > 0) {
2398 ids[bottom++] = ids[cur];
2399 }
2400 }
2401 top += r;
2402 cur++;
2403 }
2404 if (bottom == 0) {
2405 // Handle a situation, when the OS reports no memory available.
2406 // Assume UMA architecture.
2407 ids[0] = 0;
2408 return 1;
2409 }
2410 return bottom;
2411 }
2412
2413 // Detect the topology change. Typically happens during CPU plugging-unplugging.
numa_topology_changed()2414 bool os::numa_topology_changed() {
2415 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2416 if (is_stale != -1 && is_stale) {
2417 Solaris::lgrp_fini(Solaris::lgrp_cookie());
2418 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2419 assert(c != 0, "Failure to initialize LGRP API");
2420 Solaris::set_lgrp_cookie(c);
2421 return true;
2422 }
2423 return false;
2424 }
2425
2426 // Get the group id of the current LWP.
numa_get_group_id()2427 int os::numa_get_group_id() {
2428 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2429 if (lgrp_id == -1) {
2430 return 0;
2431 }
2432 const int size = os::numa_get_groups_num();
2433 int *ids = (int*)alloca(size * sizeof(int));
2434
2435 // Get the ids of all lgroups with memory; r is the count.
2436 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2437 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2438 if (r <= 0) {
2439 return 0;
2440 }
2441 return ids[os::random() % r];
2442 }
2443
2444 // Request information about the page.
get_page_info(char * start,page_info * info)2445 bool os::get_page_info(char *start, page_info* info) {
2446 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2447 uint64_t addr = (uintptr_t)start;
2448 uint64_t outdata[2];
2449 uint_t validity = 0;
2450
2451 if (meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2452 return false;
2453 }
2454
2455 info->size = 0;
2456 info->lgrp_id = -1;
2457
2458 if ((validity & 1) != 0) {
2459 if ((validity & 2) != 0) {
2460 info->lgrp_id = outdata[0];
2461 }
2462 if ((validity & 4) != 0) {
2463 info->size = outdata[1];
2464 }
2465 return true;
2466 }
2467 return false;
2468 }
2469
2470 // Scan the pages from start to end until a page different than
2471 // the one described in the info parameter is encountered.
scan_pages(char * start,char * end,page_info * page_expected,page_info * page_found)2472 char *os::scan_pages(char *start, char* end, page_info* page_expected,
2473 page_info* page_found) {
2474 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2475 const size_t types = sizeof(info_types) / sizeof(info_types[0]);
2476 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1];
2477 uint_t validity[MAX_MEMINFO_CNT];
2478
2479 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
2480 uint64_t p = (uint64_t)start;
2481 while (p < (uint64_t)end) {
2482 addrs[0] = p;
2483 size_t addrs_count = 1;
2484 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) {
2485 addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
2486 addrs_count++;
2487 }
2488
2489 if (meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
2490 return NULL;
2491 }
2492
2493 size_t i = 0;
2494 for (; i < addrs_count; i++) {
2495 if ((validity[i] & 1) != 0) {
2496 if ((validity[i] & 4) != 0) {
2497 if (outdata[types * i + 1] != page_expected->size) {
2498 break;
2499 }
2500 } else if (page_expected->size != 0) {
2501 break;
2502 }
2503
2504 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
2505 if (outdata[types * i] != page_expected->lgrp_id) {
2506 break;
2507 }
2508 }
2509 } else {
2510 return NULL;
2511 }
2512 }
2513
2514 if (i < addrs_count) {
2515 if ((validity[i] & 2) != 0) {
2516 page_found->lgrp_id = outdata[types * i];
2517 } else {
2518 page_found->lgrp_id = -1;
2519 }
2520 if ((validity[i] & 4) != 0) {
2521 page_found->size = outdata[types * i + 1];
2522 } else {
2523 page_found->size = 0;
2524 }
2525 return (char*)addrs[i];
2526 }
2527
2528 p = addrs[addrs_count - 1] + page_size;
2529 }
2530 return end;
2531 }
2532
pd_uncommit_memory(char * addr,size_t bytes)2533 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
2534 size_t size = bytes;
2535 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2536 // uncommitted page. Otherwise, the read/write might succeed if we
2537 // have enough swap space to back the physical page.
2538 return
2539 NULL != Solaris::mmap_chunk(addr, size,
2540 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
2541 PROT_NONE);
2542 }
2543
mmap_chunk(char * addr,size_t size,int flags,int prot)2544 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
2545 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
2546
2547 if (b == MAP_FAILED) {
2548 return NULL;
2549 }
2550 return b;
2551 }
2552
anon_mmap(char * requested_addr,size_t bytes,size_t alignment_hint,bool fixed)2553 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes,
2554 size_t alignment_hint, bool fixed) {
2555 char* addr = requested_addr;
2556 int flags = MAP_PRIVATE | MAP_NORESERVE;
2557
2558 assert(!(fixed && (alignment_hint > 0)),
2559 "alignment hint meaningless with fixed mmap");
2560
2561 if (fixed) {
2562 flags |= MAP_FIXED;
2563 } else if (alignment_hint > (size_t) vm_page_size()) {
2564 flags |= MAP_ALIGN;
2565 addr = (char*) alignment_hint;
2566 }
2567
2568 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2569 // uncommitted page. Otherwise, the read/write might succeed if we
2570 // have enough swap space to back the physical page.
2571 return mmap_chunk(addr, bytes, flags, PROT_NONE);
2572 }
2573
pd_reserve_memory(size_t bytes,char * requested_addr,size_t alignment_hint)2574 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2575 size_t alignment_hint) {
2576 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint,
2577 (requested_addr != NULL));
2578
2579 guarantee(requested_addr == NULL || requested_addr == addr,
2580 "OS failed to return requested mmap address.");
2581 return addr;
2582 }
2583
pd_attempt_reserve_memory_at(size_t bytes,char * requested_addr,int file_desc)2584 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
2585 assert(file_desc >= 0, "file_desc is not valid");
2586 char* result = pd_attempt_reserve_memory_at(bytes, requested_addr);
2587 if (result != NULL) {
2588 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
2589 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
2590 }
2591 }
2592 return result;
2593 }
2594
2595 // Reserve memory at an arbitrary address, only if that area is
2596 // available (and not reserved for something else).
2597
pd_attempt_reserve_memory_at(size_t bytes,char * requested_addr)2598 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2599 const int max_tries = 10;
2600 char* base[max_tries];
2601 size_t size[max_tries];
2602
2603 // Solaris adds a gap between mmap'ed regions. The size of the gap
2604 // is dependent on the requested size and the MMU. Our initial gap
2605 // value here is just a guess and will be corrected later.
2606 bool had_top_overlap = false;
2607 bool have_adjusted_gap = false;
2608 size_t gap = 0x400000;
2609
2610 // Assert only that the size is a multiple of the page size, since
2611 // that's all that mmap requires, and since that's all we really know
2612 // about at this low abstraction level. If we need higher alignment,
2613 // we can either pass an alignment to this method or verify alignment
2614 // in one of the methods further up the call chain. See bug 5044738.
2615 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2616
2617 // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
2618 // Give it a try, if the kernel honors the hint we can return immediately.
2619 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
2620
2621 volatile int err = errno;
2622 if (addr == requested_addr) {
2623 return addr;
2624 } else if (addr != NULL) {
2625 pd_unmap_memory(addr, bytes);
2626 }
2627
2628 if (log_is_enabled(Warning, os)) {
2629 char buf[256];
2630 buf[0] = '\0';
2631 if (addr == NULL) {
2632 jio_snprintf(buf, sizeof(buf), ": %s", os::strerror(err));
2633 }
2634 log_info(os)("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at "
2635 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT
2636 "%s", bytes, requested_addr, addr, buf);
2637 }
2638
2639 // Address hint method didn't work. Fall back to the old method.
2640 // In theory, once SNV becomes our oldest supported platform, this
2641 // code will no longer be needed.
2642 //
2643 // Repeatedly allocate blocks until the block is allocated at the
2644 // right spot. Give up after max_tries.
2645 int i;
2646 for (i = 0; i < max_tries; ++i) {
2647 base[i] = reserve_memory(bytes);
2648
2649 if (base[i] != NULL) {
2650 // Is this the block we wanted?
2651 if (base[i] == requested_addr) {
2652 size[i] = bytes;
2653 break;
2654 }
2655
2656 // check that the gap value is right
2657 if (had_top_overlap && !have_adjusted_gap) {
2658 size_t actual_gap = base[i-1] - base[i] - bytes;
2659 if (gap != actual_gap) {
2660 // adjust the gap value and retry the last 2 allocations
2661 assert(i > 0, "gap adjustment code problem");
2662 have_adjusted_gap = true; // adjust the gap only once, just in case
2663 gap = actual_gap;
2664 log_info(os)("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap);
2665 unmap_memory(base[i], bytes);
2666 unmap_memory(base[i-1], size[i-1]);
2667 i-=2;
2668 continue;
2669 }
2670 }
2671
2672 // Does this overlap the block we wanted? Give back the overlapped
2673 // parts and try again.
2674 //
2675 // There is still a bug in this code: if top_overlap == bytes,
2676 // the overlap is offset from requested region by the value of gap.
2677 // In this case giving back the overlapped part will not work,
2678 // because we'll give back the entire block at base[i] and
2679 // therefore the subsequent allocation will not generate a new gap.
2680 // This could be fixed with a new algorithm that used larger
2681 // or variable size chunks to find the requested region -
2682 // but such a change would introduce additional complications.
2683 // It's rare enough that the planets align for this bug,
2684 // so we'll just wait for a fix for 6204603/5003415 which
2685 // will provide a mmap flag to allow us to avoid this business.
2686
2687 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
2688 if (top_overlap >= 0 && top_overlap < bytes) {
2689 had_top_overlap = true;
2690 unmap_memory(base[i], top_overlap);
2691 base[i] += top_overlap;
2692 size[i] = bytes - top_overlap;
2693 } else {
2694 size_t bottom_overlap = base[i] + bytes - requested_addr;
2695 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
2696 if (bottom_overlap == 0) {
2697 log_info(os)("attempt_reserve_memory_at: possible alignment bug");
2698 }
2699 unmap_memory(requested_addr, bottom_overlap);
2700 size[i] = bytes - bottom_overlap;
2701 } else {
2702 size[i] = bytes;
2703 }
2704 }
2705 }
2706 }
2707
2708 // Give back the unused reserved pieces.
2709
2710 for (int j = 0; j < i; ++j) {
2711 if (base[j] != NULL) {
2712 unmap_memory(base[j], size[j]);
2713 }
2714 }
2715
2716 return (i < max_tries) ? requested_addr : NULL;
2717 }
2718
pd_release_memory(char * addr,size_t bytes)2719 bool os::pd_release_memory(char* addr, size_t bytes) {
2720 size_t size = bytes;
2721 return munmap(addr, size) == 0;
2722 }
2723
solaris_mprotect(char * addr,size_t bytes,int prot)2724 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
2725 assert(addr == (char*)align_down((uintptr_t)addr, os::vm_page_size()),
2726 "addr must be page aligned");
2727 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+bytes), prot);
2728 int retVal = mprotect(addr, bytes, prot);
2729 return retVal == 0;
2730 }
2731
2732 // Protect memory (Used to pass readonly pages through
2733 // JNI GetArray<type>Elements with empty arrays.)
2734 // Also, used for serialization page and for compressed oops null pointer
2735 // checking.
protect_memory(char * addr,size_t bytes,ProtType prot,bool is_committed)2736 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2737 bool is_committed) {
2738 unsigned int p = 0;
2739 switch (prot) {
2740 case MEM_PROT_NONE: p = PROT_NONE; break;
2741 case MEM_PROT_READ: p = PROT_READ; break;
2742 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2743 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2744 default:
2745 ShouldNotReachHere();
2746 }
2747 // is_committed is unused.
2748 return solaris_mprotect(addr, bytes, p);
2749 }
2750
2751 // guard_memory and unguard_memory only happens within stack guard pages.
2752 // Since ISM pertains only to the heap, guard and unguard memory should not
2753 /// happen with an ISM region.
guard_memory(char * addr,size_t bytes)2754 bool os::guard_memory(char* addr, size_t bytes) {
2755 return solaris_mprotect(addr, bytes, PROT_NONE);
2756 }
2757
unguard_memory(char * addr,size_t bytes)2758 bool os::unguard_memory(char* addr, size_t bytes) {
2759 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
2760 }
2761
2762 // Large page support
2763 static size_t _large_page_size = 0;
2764
2765 // Insertion sort for small arrays (descending order).
insertion_sort_descending(size_t * array,int len)2766 static void insertion_sort_descending(size_t* array, int len) {
2767 for (int i = 0; i < len; i++) {
2768 size_t val = array[i];
2769 for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
2770 size_t tmp = array[key];
2771 array[key] = array[key - 1];
2772 array[key - 1] = tmp;
2773 }
2774 }
2775 }
2776
mpss_sanity_check(bool warn,size_t * page_size)2777 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) {
2778 const unsigned int usable_count = VM_Version::page_size_count();
2779 if (usable_count == 1) {
2780 return false;
2781 }
2782
2783 // Find the right getpagesizes interface. When solaris 11 is the minimum
2784 // build platform, getpagesizes() (without the '2') can be called directly.
2785 typedef int (*gps_t)(size_t[], int);
2786 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2"));
2787 if (gps_func == NULL) {
2788 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes"));
2789 if (gps_func == NULL) {
2790 if (warn) {
2791 warning("MPSS is not supported by the operating system.");
2792 }
2793 return false;
2794 }
2795 }
2796
2797 // Fill the array of page sizes.
2798 int n = (*gps_func)(_page_sizes, page_sizes_max);
2799 assert(n > 0, "Solaris bug?");
2800
2801 if (n == page_sizes_max) {
2802 // Add a sentinel value (necessary only if the array was completely filled
2803 // since it is static (zeroed at initialization)).
2804 _page_sizes[--n] = 0;
2805 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
2806 }
2807 assert(_page_sizes[n] == 0, "missing sentinel");
2808 trace_page_sizes("available page sizes", _page_sizes, n);
2809
2810 if (n == 1) return false; // Only one page size available.
2811
2812 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
2813 // select up to usable_count elements. First sort the array, find the first
2814 // acceptable value, then copy the usable sizes to the top of the array and
2815 // trim the rest. Make sure to include the default page size :-).
2816 //
2817 // A better policy could get rid of the 4M limit by taking the sizes of the
2818 // important VM memory regions (java heap and possibly the code cache) into
2819 // account.
2820 insertion_sort_descending(_page_sizes, n);
2821 const size_t size_limit =
2822 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
2823 int beg;
2824 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */;
2825 const int end = MIN2((int)usable_count, n) - 1;
2826 for (int cur = 0; cur < end; ++cur, ++beg) {
2827 _page_sizes[cur] = _page_sizes[beg];
2828 }
2829 _page_sizes[end] = vm_page_size();
2830 _page_sizes[end + 1] = 0;
2831
2832 if (_page_sizes[end] > _page_sizes[end - 1]) {
2833 // Default page size is not the smallest; sort again.
2834 insertion_sort_descending(_page_sizes, end + 1);
2835 }
2836 *page_size = _page_sizes[0];
2837
2838 trace_page_sizes("usable page sizes", _page_sizes, end + 1);
2839 return true;
2840 }
2841
large_page_init()2842 void os::large_page_init() {
2843 if (UseLargePages) {
2844 // print a warning if any large page related flag is specified on command line
2845 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2846 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2847
2848 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
2849 }
2850 }
2851
is_valid_page_size(size_t bytes)2852 bool os::Solaris::is_valid_page_size(size_t bytes) {
2853 for (int i = 0; _page_sizes[i] != 0; i++) {
2854 if (_page_sizes[i] == bytes) {
2855 return true;
2856 }
2857 }
2858 return false;
2859 }
2860
setup_large_pages(caddr_t start,size_t bytes,size_t align)2861 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) {
2862 assert(is_valid_page_size(align), SIZE_FORMAT " is not a valid page size", align);
2863 assert(is_aligned((void*) start, align),
2864 PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align);
2865 assert(is_aligned(bytes, align),
2866 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align);
2867
2868 // Signal to OS that we want large pages for addresses
2869 // from addr, addr + bytes
2870 struct memcntl_mha mpss_struct;
2871 mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
2872 mpss_struct.mha_pagesize = align;
2873 mpss_struct.mha_flags = 0;
2874 // Upon successful completion, memcntl() returns 0
2875 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) {
2876 debug_only(warning("Attempt to use MPSS failed."));
2877 return false;
2878 }
2879 return true;
2880 }
2881
reserve_memory_special(size_t size,size_t alignment,char * addr,bool exec)2882 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) {
2883 fatal("os::reserve_memory_special should not be called on Solaris.");
2884 return NULL;
2885 }
2886
release_memory_special(char * base,size_t bytes)2887 bool os::release_memory_special(char* base, size_t bytes) {
2888 fatal("os::release_memory_special should not be called on Solaris.");
2889 return false;
2890 }
2891
large_page_size()2892 size_t os::large_page_size() {
2893 return _large_page_size;
2894 }
2895
2896 // MPSS allows application to commit large page memory on demand; with ISM
2897 // the entire memory region must be allocated as shared memory.
can_commit_large_page_memory()2898 bool os::can_commit_large_page_memory() {
2899 return true;
2900 }
2901
can_execute_large_page_memory()2902 bool os::can_execute_large_page_memory() {
2903 return true;
2904 }
2905
2906 // Read calls from inside the vm need to perform state transitions
read(int fd,void * buf,unsigned int nBytes)2907 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2908 size_t res;
2909 JavaThread* thread = (JavaThread*)Thread::current();
2910 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm");
2911 ThreadBlockInVM tbiv(thread);
2912 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res);
2913 return res;
2914 }
2915
read_at(int fd,void * buf,unsigned int nBytes,jlong offset)2916 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2917 size_t res;
2918 JavaThread* thread = (JavaThread*)Thread::current();
2919 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm");
2920 ThreadBlockInVM tbiv(thread);
2921 RESTARTABLE(::pread(fd, buf, (size_t) nBytes, offset), res);
2922 return res;
2923 }
2924
restartable_read(int fd,void * buf,unsigned int nBytes)2925 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
2926 size_t res;
2927 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
2928 "Assumed _thread_in_native");
2929 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res);
2930 return res;
2931 }
2932
2933 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
infinite_sleep()2934 void os::infinite_sleep() {
2935 while (true) { // sleep forever ...
2936 ::sleep(100); // ... 100 seconds at a time
2937 }
2938 }
2939
2940 // Used to convert frequent JVM_Yield() to nops
dont_yield()2941 bool os::dont_yield() {
2942 if (DontYieldALot) {
2943 static hrtime_t last_time = 0;
2944 hrtime_t diff = getTimeNanos() - last_time;
2945
2946 if (diff < DontYieldALotInterval * 1000000) {
2947 return true;
2948 }
2949
2950 last_time += diff;
2951
2952 return false;
2953 } else {
2954 return false;
2955 }
2956 }
2957
2958 // Note that yield semantics are defined by the scheduling class to which
2959 // the thread currently belongs. Typically, yield will _not yield to
2960 // other equal or higher priority threads that reside on the dispatch queues
2961 // of other CPUs.
2962
naked_yield()2963 void os::naked_yield() {
2964 thr_yield();
2965 }
2966
2967 // Interface for setting lwp priorities. We are using T2 libthread,
2968 // which forces the use of bound threads, so all of our threads will
2969 // be assigned to real lwp's. Using the thr_setprio function is
2970 // meaningless in this mode so we must adjust the real lwp's priority.
2971 // The routines below implement the getting and setting of lwp priorities.
2972 //
2973 // Note: There are three priority scales used on Solaris. Java priotities
2974 // which range from 1 to 10, libthread "thr_setprio" scale which range
2975 // from 0 to 127, and the current scheduling class of the process we
2976 // are running in. This is typically from -60 to +60.
2977 // The setting of the lwp priorities in done after a call to thr_setprio
2978 // so Java priorities are mapped to libthread priorities and we map from
2979 // the latter to lwp priorities. We don't keep priorities stored in
2980 // Java priorities since some of our worker threads want to set priorities
2981 // higher than all Java threads.
2982 //
2983 // For related information:
2984 // (1) man -s 2 priocntl
2985 // (2) man -s 4 priocntl
2986 // (3) man dispadmin
2987 // = librt.so
2988 // = libthread/common/rtsched.c - thrp_setlwpprio().
2989 // = ps -cL <pid> ... to validate priority.
2990 // = sched_get_priority_min and _max
2991 // pthread_create
2992 // sched_setparam
2993 // pthread_setschedparam
2994 //
2995 // Assumptions:
2996 // + We assume that all threads in the process belong to the same
2997 // scheduling class. IE. an homogenous process.
2998 // + Must be root or in IA group to change change "interactive" attribute.
2999 // Priocntl() will fail silently. The only indication of failure is when
3000 // we read-back the value and notice that it hasn't changed.
3001 // + Interactive threads enter the runq at the head, non-interactive at the tail.
3002 // + For RT, change timeslice as well. Invariant:
3003 // constant "priority integral"
3004 // Konst == TimeSlice * (60-Priority)
3005 // Given a priority, compute appropriate timeslice.
3006 // + Higher numerical values have higher priority.
3007
3008 // sched class attributes
3009 typedef struct {
3010 int schedPolicy; // classID
3011 int maxPrio;
3012 int minPrio;
3013 } SchedInfo;
3014
3015
3016 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits;
3017
3018 #ifdef ASSERT
3019 static int ReadBackValidate = 1;
3020 #endif
3021 static int myClass = 0;
3022 static int myMin = 0;
3023 static int myMax = 0;
3024 static int myCur = 0;
3025 static bool priocntl_enable = false;
3026
3027 static const int criticalPrio = FXCriticalPriority;
3028 static int java_MaxPriority_to_os_priority = 0; // Saved mapping
3029
3030
3031 // lwp_priocntl_init
3032 //
3033 // Try to determine the priority scale for our process.
3034 //
3035 // Return errno or 0 if OK.
3036 //
lwp_priocntl_init()3037 static int lwp_priocntl_init() {
3038 int rslt;
3039 pcinfo_t ClassInfo;
3040 pcparms_t ParmInfo;
3041 int i;
3042
3043 if (!UseThreadPriorities) return 0;
3044
3045 // If ThreadPriorityPolicy is 1, switch tables
3046 if (ThreadPriorityPolicy == 1) {
3047 for (i = 0; i < CriticalPriority+1; i++)
3048 os::java_to_os_priority[i] = prio_policy1[i];
3049 }
3050 if (UseCriticalJavaThreadPriority) {
3051 // MaxPriority always maps to the FX scheduling class and criticalPrio.
3052 // See set_native_priority() and set_lwp_class_and_priority().
3053 // Save original MaxPriority mapping in case attempt to
3054 // use critical priority fails.
3055 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority];
3056 // Set negative to distinguish from other priorities
3057 os::java_to_os_priority[MaxPriority] = -criticalPrio;
3058 }
3059
3060 // Get IDs for a set of well-known scheduling classes.
3061 // TODO-FIXME: GETCLINFO returns the current # of classes in the
3062 // the system. We should have a loop that iterates over the
3063 // classID values, which are known to be "small" integers.
3064
3065 strcpy(ClassInfo.pc_clname, "TS");
3066 ClassInfo.pc_cid = -1;
3067 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3068 if (rslt < 0) return errno;
3069 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
3070 tsLimits.schedPolicy = ClassInfo.pc_cid;
3071 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
3072 tsLimits.minPrio = -tsLimits.maxPrio;
3073
3074 strcpy(ClassInfo.pc_clname, "IA");
3075 ClassInfo.pc_cid = -1;
3076 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3077 if (rslt < 0) return errno;
3078 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
3079 iaLimits.schedPolicy = ClassInfo.pc_cid;
3080 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
3081 iaLimits.minPrio = -iaLimits.maxPrio;
3082
3083 strcpy(ClassInfo.pc_clname, "RT");
3084 ClassInfo.pc_cid = -1;
3085 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3086 if (rslt < 0) return errno;
3087 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1");
3088 rtLimits.schedPolicy = ClassInfo.pc_cid;
3089 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
3090 rtLimits.minPrio = 0;
3091
3092 strcpy(ClassInfo.pc_clname, "FX");
3093 ClassInfo.pc_cid = -1;
3094 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3095 if (rslt < 0) return errno;
3096 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1");
3097 fxLimits.schedPolicy = ClassInfo.pc_cid;
3098 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri;
3099 fxLimits.minPrio = 0;
3100
3101 // Query our "current" scheduling class.
3102 // This will normally be IA, TS or, rarely, FX or RT.
3103 memset(&ParmInfo, 0, sizeof(ParmInfo));
3104 ParmInfo.pc_cid = PC_CLNULL;
3105 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3106 if (rslt < 0) return errno;
3107 myClass = ParmInfo.pc_cid;
3108
3109 // We now know our scheduling classId, get specific information
3110 // about the class.
3111 ClassInfo.pc_cid = myClass;
3112 ClassInfo.pc_clname[0] = 0;
3113 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo);
3114 if (rslt < 0) return errno;
3115
3116 if (ThreadPriorityVerbose) {
3117 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
3118 }
3119
3120 memset(&ParmInfo, 0, sizeof(pcparms_t));
3121 ParmInfo.pc_cid = PC_CLNULL;
3122 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3123 if (rslt < 0) return errno;
3124
3125 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3126 myMin = rtLimits.minPrio;
3127 myMax = rtLimits.maxPrio;
3128 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3129 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3130 myMin = iaLimits.minPrio;
3131 myMax = iaLimits.maxPrio;
3132 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict
3133 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3134 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3135 myMin = tsLimits.minPrio;
3136 myMax = tsLimits.maxPrio;
3137 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict
3138 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3139 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3140 myMin = fxLimits.minPrio;
3141 myMax = fxLimits.maxPrio;
3142 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict
3143 } else {
3144 // No clue - punt
3145 if (ThreadPriorityVerbose) {
3146 tty->print_cr("Unknown scheduling class: %s ... \n",
3147 ClassInfo.pc_clname);
3148 }
3149 return EINVAL; // no clue, punt
3150 }
3151
3152 if (ThreadPriorityVerbose) {
3153 tty->print_cr("Thread priority Range: [%d..%d]\n", myMin, myMax);
3154 }
3155
3156 priocntl_enable = true; // Enable changing priorities
3157 return 0;
3158 }
3159
3160 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms))
3161 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms))
3162 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms))
3163 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms))
3164
3165
3166 // scale_to_lwp_priority
3167 //
3168 // Convert from the libthread "thr_setprio" scale to our current
3169 // lwp scheduling class scale.
3170 //
scale_to_lwp_priority(int rMin,int rMax,int x)3171 static int scale_to_lwp_priority(int rMin, int rMax, int x) {
3172 int v;
3173
3174 if (x == 127) return rMax; // avoid round-down
3175 v = (((x*(rMax-rMin)))/128)+rMin;
3176 return v;
3177 }
3178
3179
3180 // set_lwp_class_and_priority
set_lwp_class_and_priority(int ThreadID,int lwpid,int newPrio,int new_class,bool scale)3181 int set_lwp_class_and_priority(int ThreadID, int lwpid,
3182 int newPrio, int new_class, bool scale) {
3183 int rslt;
3184 int Actual, Expected, prv;
3185 pcparms_t ParmInfo; // for GET-SET
3186 #ifdef ASSERT
3187 pcparms_t ReadBack; // for readback
3188 #endif
3189
3190 // Set priority via PC_GETPARMS, update, PC_SETPARMS
3191 // Query current values.
3192 // TODO: accelerate this by eliminating the PC_GETPARMS call.
3193 // Cache "pcparms_t" in global ParmCache.
3194 // TODO: elide set-to-same-value
3195
3196 // If something went wrong on init, don't change priorities.
3197 if (!priocntl_enable) {
3198 if (ThreadPriorityVerbose) {
3199 tty->print_cr("Trying to set priority but init failed, ignoring");
3200 }
3201 return EINVAL;
3202 }
3203
3204 // If lwp hasn't started yet, just return
3205 // the _start routine will call us again.
3206 if (lwpid <= 0) {
3207 if (ThreadPriorityVerbose) {
3208 tty->print_cr("deferring the set_lwp_class_and_priority of thread "
3209 INTPTR_FORMAT " to %d, lwpid not set",
3210 ThreadID, newPrio);
3211 }
3212 return 0;
3213 }
3214
3215 if (ThreadPriorityVerbose) {
3216 tty->print_cr ("set_lwp_class_and_priority("
3217 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
3218 ThreadID, lwpid, newPrio);
3219 }
3220
3221 memset(&ParmInfo, 0, sizeof(pcparms_t));
3222 ParmInfo.pc_cid = PC_CLNULL;
3223 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
3224 if (rslt < 0) return errno;
3225
3226 int cur_class = ParmInfo.pc_cid;
3227 ParmInfo.pc_cid = (id_t)new_class;
3228
3229 if (new_class == rtLimits.schedPolicy) {
3230 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms;
3231 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio,
3232 rtLimits.maxPrio, newPrio)
3233 : newPrio;
3234 rtInfo->rt_tqsecs = RT_NOCHANGE;
3235 rtInfo->rt_tqnsecs = RT_NOCHANGE;
3236 if (ThreadPriorityVerbose) {
3237 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
3238 }
3239 } else if (new_class == iaLimits.schedPolicy) {
3240 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3241 int maxClamped = MIN2(iaLimits.maxPrio,
3242 cur_class == new_class
3243 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio);
3244 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio,
3245 maxClamped, newPrio)
3246 : newPrio;
3247 iaInfo->ia_uprilim = cur_class == new_class
3248 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio;
3249 iaInfo->ia_mode = IA_NOCHANGE;
3250 if (ThreadPriorityVerbose) {
3251 tty->print_cr("IA: [%d...%d] %d->%d\n",
3252 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
3253 }
3254 } else if (new_class == tsLimits.schedPolicy) {
3255 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3256 int maxClamped = MIN2(tsLimits.maxPrio,
3257 cur_class == new_class
3258 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio);
3259 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio,
3260 maxClamped, newPrio)
3261 : newPrio;
3262 tsInfo->ts_uprilim = cur_class == new_class
3263 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio;
3264 if (ThreadPriorityVerbose) {
3265 tty->print_cr("TS: [%d...%d] %d->%d\n",
3266 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
3267 }
3268 } else if (new_class == fxLimits.schedPolicy) {
3269 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3270 int maxClamped = MIN2(fxLimits.maxPrio,
3271 cur_class == new_class
3272 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio);
3273 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio,
3274 maxClamped, newPrio)
3275 : newPrio;
3276 fxInfo->fx_uprilim = cur_class == new_class
3277 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio;
3278 fxInfo->fx_tqsecs = FX_NOCHANGE;
3279 fxInfo->fx_tqnsecs = FX_NOCHANGE;
3280 if (ThreadPriorityVerbose) {
3281 tty->print_cr("FX: [%d...%d] %d->%d\n",
3282 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri);
3283 }
3284 } else {
3285 if (ThreadPriorityVerbose) {
3286 tty->print_cr("Unknown new scheduling class %d\n", new_class);
3287 }
3288 return EINVAL; // no clue, punt
3289 }
3290
3291 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
3292 if (ThreadPriorityVerbose && rslt) {
3293 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
3294 }
3295 if (rslt < 0) return errno;
3296
3297 #ifdef ASSERT
3298 // Sanity check: read back what we just attempted to set.
3299 // In theory it could have changed in the interim ...
3300 //
3301 // The priocntl system call is tricky.
3302 // Sometimes it'll validate the priority value argument and
3303 // return EINVAL if unhappy. At other times it fails silently.
3304 // Readbacks are prudent.
3305
3306 if (!ReadBackValidate) return 0;
3307
3308 memset(&ReadBack, 0, sizeof(pcparms_t));
3309 ReadBack.pc_cid = PC_CLNULL;
3310 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
3311 assert(rslt >= 0, "priocntl failed");
3312 Actual = Expected = 0xBAD;
3313 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
3314 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3315 Actual = RTPRI(ReadBack)->rt_pri;
3316 Expected = RTPRI(ParmInfo)->rt_pri;
3317 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3318 Actual = IAPRI(ReadBack)->ia_upri;
3319 Expected = IAPRI(ParmInfo)->ia_upri;
3320 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3321 Actual = TSPRI(ReadBack)->ts_upri;
3322 Expected = TSPRI(ParmInfo)->ts_upri;
3323 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3324 Actual = FXPRI(ReadBack)->fx_upri;
3325 Expected = FXPRI(ParmInfo)->fx_upri;
3326 } else {
3327 if (ThreadPriorityVerbose) {
3328 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n",
3329 ParmInfo.pc_cid);
3330 }
3331 }
3332
3333 if (Actual != Expected) {
3334 if (ThreadPriorityVerbose) {
3335 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
3336 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
3337 }
3338 }
3339 #endif
3340
3341 return 0;
3342 }
3343
3344 // Solaris only gives access to 128 real priorities at a time,
3345 // so we expand Java's ten to fill this range. This would be better
3346 // if we dynamically adjusted relative priorities.
3347 //
3348 // The ThreadPriorityPolicy option allows us to select 2 different
3349 // priority scales.
3350 //
3351 // ThreadPriorityPolicy=0
3352 // Since the Solaris' default priority is MaximumPriority, we do not
3353 // set a priority lower than Max unless a priority lower than
3354 // NormPriority is requested.
3355 //
3356 // ThreadPriorityPolicy=1
3357 // This mode causes the priority table to get filled with
3358 // linear values. NormPriority get's mapped to 50% of the
3359 // Maximum priority an so on. This will cause VM threads
3360 // to get unfair treatment against other Solaris processes
3361 // which do not explicitly alter their thread priorities.
3362
3363 int os::java_to_os_priority[CriticalPriority + 1] = {
3364 -99999, // 0 Entry should never be used
3365
3366 0, // 1 MinPriority
3367 32, // 2
3368 64, // 3
3369
3370 96, // 4
3371 127, // 5 NormPriority
3372 127, // 6
3373
3374 127, // 7
3375 127, // 8
3376 127, // 9 NearMaxPriority
3377
3378 127, // 10 MaxPriority
3379
3380 -criticalPrio // 11 CriticalPriority
3381 };
3382
set_native_priority(Thread * thread,int newpri)3383 OSReturn os::set_native_priority(Thread* thread, int newpri) {
3384 OSThread* osthread = thread->osthread();
3385
3386 // Save requested priority in case the thread hasn't been started
3387 osthread->set_native_priority(newpri);
3388
3389 // Check for critical priority request
3390 bool fxcritical = false;
3391 if (newpri == -criticalPrio) {
3392 fxcritical = true;
3393 newpri = criticalPrio;
3394 }
3395
3396 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
3397 if (!UseThreadPriorities) return OS_OK;
3398
3399 int status = 0;
3400
3401 if (!fxcritical) {
3402 // Use thr_setprio only if we have a priority that thr_setprio understands
3403 status = thr_setprio(thread->osthread()->thread_id(), newpri);
3404 }
3405
3406 int lwp_status =
3407 set_lwp_class_and_priority(osthread->thread_id(),
3408 osthread->lwp_id(),
3409 newpri,
3410 fxcritical ? fxLimits.schedPolicy : myClass,
3411 !fxcritical);
3412 if (lwp_status != 0 && fxcritical) {
3413 // Try again, this time without changing the scheduling class
3414 newpri = java_MaxPriority_to_os_priority;
3415 lwp_status = set_lwp_class_and_priority(osthread->thread_id(),
3416 osthread->lwp_id(),
3417 newpri, myClass, false);
3418 }
3419 status |= lwp_status;
3420 return (status == 0) ? OS_OK : OS_ERR;
3421 }
3422
3423
get_native_priority(const Thread * const thread,int * priority_ptr)3424 OSReturn os::get_native_priority(const Thread* const thread,
3425 int *priority_ptr) {
3426 int p;
3427 if (!UseThreadPriorities) {
3428 *priority_ptr = NormalPriority;
3429 return OS_OK;
3430 }
3431 int status = thr_getprio(thread->osthread()->thread_id(), &p);
3432 if (status != 0) {
3433 return OS_ERR;
3434 }
3435 *priority_ptr = p;
3436 return OS_OK;
3437 }
3438
3439
3440 // Hint to the underlying OS that a task switch would not be good.
3441 // Void return because it's a hint and can fail.
hint_no_preempt()3442 void os::hint_no_preempt() {
3443 schedctl_start(schedctl_init());
3444 }
3445
3446 ////////////////////////////////////////////////////////////////////////////////
3447 // suspend/resume support
3448
3449 // The low-level signal-based suspend/resume support is a remnant from the
3450 // old VM-suspension that used to be for java-suspension, safepoints etc,
3451 // within hotspot. Currently used by JFR's OSThreadSampler
3452 //
3453 // The remaining code is greatly simplified from the more general suspension
3454 // code that used to be used.
3455 //
3456 // The protocol is quite simple:
3457 // - suspend:
3458 // - sends a signal to the target thread
3459 // - polls the suspend state of the osthread using a yield loop
3460 // - target thread signal handler (SR_handler) sets suspend state
3461 // and blocks in sigsuspend until continued
3462 // - resume:
3463 // - sets target osthread state to continue
3464 // - sends signal to end the sigsuspend loop in the SR_handler
3465 //
3466 // Note that the SR_lock plays no role in this suspend/resume protocol,
3467 // but is checked for NULL in SR_handler as a thread termination indicator.
3468 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
3469 //
3470 // Note that resume_clear_context() and suspend_save_context() are needed
3471 // by SR_handler(), so that fetch_frame_from_ucontext() works,
3472 // which in part is used by:
3473 // - Forte Analyzer: AsyncGetCallTrace()
3474 // - StackBanging: get_frame_at_stack_banging_point()
3475 // - JFR: get_topframe()-->....-->get_valid_uc_in_signal_handler()
3476
resume_clear_context(OSThread * osthread)3477 static void resume_clear_context(OSThread *osthread) {
3478 osthread->set_ucontext(NULL);
3479 }
3480
suspend_save_context(OSThread * osthread,ucontext_t * context)3481 static void suspend_save_context(OSThread *osthread, ucontext_t* context) {
3482 osthread->set_ucontext(context);
3483 }
3484
3485 static PosixSemaphore sr_semaphore;
3486
SR_handler(Thread * thread,ucontext_t * context)3487 void os::Solaris::SR_handler(Thread* thread, ucontext_t* context) {
3488 // Save and restore errno to avoid confusing native code with EINTR
3489 // after sigsuspend.
3490 int old_errno = errno;
3491
3492 OSThread* osthread = thread->osthread();
3493 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
3494
3495 os::SuspendResume::State current = osthread->sr.state();
3496 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
3497 suspend_save_context(osthread, context);
3498
3499 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
3500 os::SuspendResume::State state = osthread->sr.suspended();
3501 if (state == os::SuspendResume::SR_SUSPENDED) {
3502 sigset_t suspend_set; // signals for sigsuspend()
3503
3504 // get current set of blocked signals and unblock resume signal
3505 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
3506 sigdelset(&suspend_set, ASYNC_SIGNAL);
3507
3508 sr_semaphore.signal();
3509 // wait here until we are resumed
3510 while (1) {
3511 sigsuspend(&suspend_set);
3512
3513 os::SuspendResume::State result = osthread->sr.running();
3514 if (result == os::SuspendResume::SR_RUNNING) {
3515 sr_semaphore.signal();
3516 break;
3517 }
3518 }
3519
3520 } else if (state == os::SuspendResume::SR_RUNNING) {
3521 // request was cancelled, continue
3522 } else {
3523 ShouldNotReachHere();
3524 }
3525
3526 resume_clear_context(osthread);
3527 } else if (current == os::SuspendResume::SR_RUNNING) {
3528 // request was cancelled, continue
3529 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
3530 // ignore
3531 } else {
3532 // ignore
3533 }
3534
3535 errno = old_errno;
3536 }
3537
print_statistics()3538 void os::print_statistics() {
3539 }
3540
message_box(const char * title,const char * message)3541 bool os::message_box(const char* title, const char* message) {
3542 int i;
3543 fdStream err(defaultStream::error_fd());
3544 for (i = 0; i < 78; i++) err.print_raw("=");
3545 err.cr();
3546 err.print_raw_cr(title);
3547 for (i = 0; i < 78; i++) err.print_raw("-");
3548 err.cr();
3549 err.print_raw_cr(message);
3550 for (i = 0; i < 78; i++) err.print_raw("=");
3551 err.cr();
3552
3553 char buf[16];
3554 // Prevent process from exiting upon "read error" without consuming all CPU
3555 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3556
3557 return buf[0] == 'y' || buf[0] == 'Y';
3558 }
3559
sr_notify(OSThread * osthread)3560 static int sr_notify(OSThread* osthread) {
3561 int status = thr_kill(osthread->thread_id(), ASYNC_SIGNAL);
3562 assert_status(status == 0, status, "thr_kill");
3563 return status;
3564 }
3565
3566 // "Randomly" selected value for how long we want to spin
3567 // before bailing out on suspending a thread, also how often
3568 // we send a signal to a thread we want to resume
3569 static const int RANDOMLY_LARGE_INTEGER = 1000000;
3570 static const int RANDOMLY_LARGE_INTEGER2 = 100;
3571
do_suspend(OSThread * osthread)3572 static bool do_suspend(OSThread* osthread) {
3573 assert(osthread->sr.is_running(), "thread should be running");
3574 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
3575
3576 // mark as suspended and send signal
3577 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
3578 // failed to switch, state wasn't running?
3579 ShouldNotReachHere();
3580 return false;
3581 }
3582
3583 if (sr_notify(osthread) != 0) {
3584 ShouldNotReachHere();
3585 }
3586
3587 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
3588 while (true) {
3589 if (sr_semaphore.timedwait(create_semaphore_timespec(0, 2000 * NANOSECS_PER_MILLISEC))) {
3590 break;
3591 } else {
3592 // timeout
3593 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
3594 if (cancelled == os::SuspendResume::SR_RUNNING) {
3595 return false;
3596 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
3597 // make sure that we consume the signal on the semaphore as well
3598 sr_semaphore.wait();
3599 break;
3600 } else {
3601 ShouldNotReachHere();
3602 return false;
3603 }
3604 }
3605 }
3606
3607 guarantee(osthread->sr.is_suspended(), "Must be suspended");
3608 return true;
3609 }
3610
do_resume(OSThread * osthread)3611 static void do_resume(OSThread* osthread) {
3612 assert(osthread->sr.is_suspended(), "thread should be suspended");
3613 assert(!sr_semaphore.trywait(), "invalid semaphore state");
3614
3615 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
3616 // failed to switch to WAKEUP_REQUEST
3617 ShouldNotReachHere();
3618 return;
3619 }
3620
3621 while (true) {
3622 if (sr_notify(osthread) == 0) {
3623 if (sr_semaphore.timedwait(create_semaphore_timespec(0, 2 * NANOSECS_PER_MILLISEC))) {
3624 if (osthread->sr.is_running()) {
3625 return;
3626 }
3627 }
3628 } else {
3629 ShouldNotReachHere();
3630 }
3631 }
3632
3633 guarantee(osthread->sr.is_running(), "Must be running!");
3634 }
3635
internal_do_task()3636 void os::SuspendedThreadTask::internal_do_task() {
3637 if (do_suspend(_thread->osthread())) {
3638 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3639 do_task(context);
3640 do_resume(_thread->osthread());
3641 }
3642 }
3643
3644 // This does not do anything on Solaris. This is basically a hook for being
3645 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
os_exception_wrapper(java_call_t f,JavaValue * value,const methodHandle & method,JavaCallArguments * args,Thread * thread)3646 void os::os_exception_wrapper(java_call_t f, JavaValue* value,
3647 const methodHandle& method, JavaCallArguments* args,
3648 Thread* thread) {
3649 f(value, method, args, thread);
3650 }
3651
3652 // This routine may be used by user applications as a "hook" to catch signals.
3653 // The user-defined signal handler must pass unrecognized signals to this
3654 // routine, and if it returns true (non-zero), then the signal handler must
3655 // return immediately. If the flag "abort_if_unrecognized" is true, then this
3656 // routine will never retun false (zero), but instead will execute a VM panic
3657 // routine kill the process.
3658 //
3659 // If this routine returns false, it is OK to call it again. This allows
3660 // the user-defined signal handler to perform checks either before or after
3661 // the VM performs its own checks. Naturally, the user code would be making
3662 // a serious error if it tried to handle an exception (such as a null check
3663 // or breakpoint) that the VM was generating for its own correct operation.
3664 //
3665 // This routine may recognize any of the following kinds of signals:
3666 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
3667 // ASYNC_SIGNAL.
3668 // It should be consulted by handlers for any of those signals.
3669 //
3670 // The caller of this routine must pass in the three arguments supplied
3671 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
3672 // field of the structure passed to sigaction(). This routine assumes that
3673 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
3674 //
3675 // Note that the VM will print warnings if it detects conflicting signal
3676 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
3677 //
3678 extern "C" JNIEXPORT int JVM_handle_solaris_signal(int signo,
3679 siginfo_t* siginfo,
3680 void* ucontext,
3681 int abort_if_unrecognized);
3682
3683
signalHandler(int sig,siginfo_t * info,void * ucVoid)3684 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
3685 int orig_errno = errno; // Preserve errno value over signal handler.
3686 JVM_handle_solaris_signal(sig, info, ucVoid, true);
3687 errno = orig_errno;
3688 }
3689
3690 // This boolean allows users to forward their own non-matching signals
3691 // to JVM_handle_solaris_signal, harmlessly.
3692 bool os::Solaris::signal_handlers_are_installed = false;
3693
3694 // For signal-chaining
3695 bool os::Solaris::libjsig_is_loaded = false;
3696 typedef struct sigaction *(*get_signal_t)(int);
3697 get_signal_t os::Solaris::get_signal_action = NULL;
3698
get_chained_signal_action(int sig)3699 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
3700 struct sigaction *actp = NULL;
3701
3702 if ((libjsig_is_loaded) && (sig <= Maxsignum)) {
3703 // Retrieve the old signal handler from libjsig
3704 actp = (*get_signal_action)(sig);
3705 }
3706 if (actp == NULL) {
3707 // Retrieve the preinstalled signal handler from jvm
3708 actp = get_preinstalled_handler(sig);
3709 }
3710
3711 return actp;
3712 }
3713
call_chained_handler(struct sigaction * actp,int sig,siginfo_t * siginfo,void * context)3714 static bool call_chained_handler(struct sigaction *actp, int sig,
3715 siginfo_t *siginfo, void *context) {
3716 // Call the old signal handler
3717 if (actp->sa_handler == SIG_DFL) {
3718 // It's more reasonable to let jvm treat it as an unexpected exception
3719 // instead of taking the default action.
3720 return false;
3721 } else if (actp->sa_handler != SIG_IGN) {
3722 if ((actp->sa_flags & SA_NODEFER) == 0) {
3723 // automaticlly block the signal
3724 sigaddset(&(actp->sa_mask), sig);
3725 }
3726
3727 sa_handler_t hand;
3728 sa_sigaction_t sa;
3729 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3730 // retrieve the chained handler
3731 if (siginfo_flag_set) {
3732 sa = actp->sa_sigaction;
3733 } else {
3734 hand = actp->sa_handler;
3735 }
3736
3737 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3738 actp->sa_handler = SIG_DFL;
3739 }
3740
3741 // try to honor the signal mask
3742 sigset_t oset;
3743 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3744
3745 // call into the chained handler
3746 if (siginfo_flag_set) {
3747 (*sa)(sig, siginfo, context);
3748 } else {
3749 (*hand)(sig);
3750 }
3751
3752 // restore the signal mask
3753 pthread_sigmask(SIG_SETMASK, &oset, 0);
3754 }
3755 // Tell jvm's signal handler the signal is taken care of.
3756 return true;
3757 }
3758
chained_handler(int sig,siginfo_t * siginfo,void * context)3759 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3760 bool chained = false;
3761 // signal-chaining
3762 if (UseSignalChaining) {
3763 struct sigaction *actp = get_chained_signal_action(sig);
3764 if (actp != NULL) {
3765 chained = call_chained_handler(actp, sig, siginfo, context);
3766 }
3767 }
3768 return chained;
3769 }
3770
get_preinstalled_handler(int sig)3771 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) {
3772 assert((chainedsigactions != (struct sigaction *)NULL) &&
3773 (preinstalled_sigs != (int *)NULL), "signals not yet initialized");
3774 if (preinstalled_sigs[sig] != 0) {
3775 return &chainedsigactions[sig];
3776 }
3777 return NULL;
3778 }
3779
save_preinstalled_handler(int sig,struct sigaction & oldAct)3780 void os::Solaris::save_preinstalled_handler(int sig,
3781 struct sigaction& oldAct) {
3782 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range");
3783 assert((chainedsigactions != (struct sigaction *)NULL) &&
3784 (preinstalled_sigs != (int *)NULL), "signals not yet initialized");
3785 chainedsigactions[sig] = oldAct;
3786 preinstalled_sigs[sig] = 1;
3787 }
3788
set_signal_handler(int sig,bool set_installed,bool oktochain)3789 void os::Solaris::set_signal_handler(int sig, bool set_installed,
3790 bool oktochain) {
3791 // Check for overwrite.
3792 struct sigaction oldAct;
3793 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3794 void* oldhand =
3795 oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3796 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3797 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3798 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3799 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
3800 if (AllowUserSignalHandlers || !set_installed) {
3801 // Do not overwrite; user takes responsibility to forward to us.
3802 return;
3803 } else if (UseSignalChaining) {
3804 if (oktochain) {
3805 // save the old handler in jvm
3806 save_preinstalled_handler(sig, oldAct);
3807 } else {
3808 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal.");
3809 }
3810 // libjsig also interposes the sigaction() call below and saves the
3811 // old sigaction on it own.
3812 } else {
3813 fatal("Encountered unexpected pre-existing sigaction handler "
3814 "%#lx for signal %d.", (long)oldhand, sig);
3815 }
3816 }
3817
3818 struct sigaction sigAct;
3819 sigfillset(&(sigAct.sa_mask));
3820 sigAct.sa_handler = SIG_DFL;
3821
3822 sigAct.sa_sigaction = signalHandler;
3823 // Handle SIGSEGV on alternate signal stack if
3824 // not using stack banging
3825 if (!UseStackBanging && sig == SIGSEGV) {
3826 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
3827 } else {
3828 sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
3829 }
3830 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
3831
3832 sigaction(sig, &sigAct, &oldAct);
3833
3834 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3835 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3836 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3837 }
3838
3839
3840 #define DO_SIGNAL_CHECK(sig) \
3841 do { \
3842 if (!sigismember(&check_signal_done, sig)) { \
3843 os::Solaris::check_signal_handler(sig); \
3844 } \
3845 } while (0)
3846
3847 // This method is a periodic task to check for misbehaving JNI applications
3848 // under CheckJNI, we can add any periodic checks here
3849
run_periodic_checks()3850 void os::run_periodic_checks() {
3851 // A big source of grief is hijacking virt. addr 0x0 on Solaris,
3852 // thereby preventing a NULL checks.
3853 if (!check_addr0_done) check_addr0_done = check_addr0(tty);
3854
3855 if (check_signals == false) return;
3856
3857 // SEGV and BUS if overridden could potentially prevent
3858 // generation of hs*.log in the event of a crash, debugging
3859 // such a case can be very challenging, so we absolutely
3860 // check for the following for a good measure:
3861 DO_SIGNAL_CHECK(SIGSEGV);
3862 DO_SIGNAL_CHECK(SIGILL);
3863 DO_SIGNAL_CHECK(SIGFPE);
3864 DO_SIGNAL_CHECK(SIGBUS);
3865 DO_SIGNAL_CHECK(SIGPIPE);
3866 DO_SIGNAL_CHECK(SIGXFSZ);
3867 DO_SIGNAL_CHECK(ASYNC_SIGNAL);
3868
3869 // ReduceSignalUsage allows the user to override these handlers
3870 // see comments at the very top and jvm_solaris.h
3871 if (!ReduceSignalUsage) {
3872 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3873 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3874 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3875 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3876 }
3877 }
3878
3879 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3880
3881 static os_sigaction_t os_sigaction = NULL;
3882
check_signal_handler(int sig)3883 void os::Solaris::check_signal_handler(int sig) {
3884 char buf[O_BUFLEN];
3885 address jvmHandler = NULL;
3886
3887 struct sigaction act;
3888 if (os_sigaction == NULL) {
3889 // only trust the default sigaction, in case it has been interposed
3890 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3891 if (os_sigaction == NULL) return;
3892 }
3893
3894 os_sigaction(sig, (struct sigaction*)NULL, &act);
3895
3896 address thisHandler = (act.sa_flags & SA_SIGINFO)
3897 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3898 : CAST_FROM_FN_PTR(address, act.sa_handler);
3899
3900
3901 switch (sig) {
3902 case SIGSEGV:
3903 case SIGBUS:
3904 case SIGFPE:
3905 case SIGPIPE:
3906 case SIGXFSZ:
3907 case SIGILL:
3908 case ASYNC_SIGNAL:
3909 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
3910 break;
3911
3912 case SHUTDOWN1_SIGNAL:
3913 case SHUTDOWN2_SIGNAL:
3914 case SHUTDOWN3_SIGNAL:
3915 case BREAK_SIGNAL:
3916 jvmHandler = (address)user_handler();
3917 break;
3918
3919 default:
3920 return;
3921 }
3922
3923 if (thisHandler != jvmHandler) {
3924 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3925 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3926 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3927 // No need to check this sig any longer
3928 sigaddset(&check_signal_done, sig);
3929 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3930 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3931 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3932 exception_name(sig, buf, O_BUFLEN));
3933 }
3934 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
3935 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3936 tty->print("expected:");
3937 os::Posix::print_sa_flags(tty, os::Solaris::get_our_sigflags(sig));
3938 tty->cr();
3939 tty->print(" found:");
3940 os::Posix::print_sa_flags(tty, act.sa_flags);
3941 tty->cr();
3942 // No need to check this sig any longer
3943 sigaddset(&check_signal_done, sig);
3944 }
3945
3946 // Print all the signal handler state
3947 if (sigismember(&check_signal_done, sig)) {
3948 print_signal_handlers(tty, buf, O_BUFLEN);
3949 }
3950
3951 }
3952
install_signal_handlers()3953 void os::Solaris::install_signal_handlers() {
3954 signal_handlers_are_installed = true;
3955
3956 // signal-chaining
3957 typedef void (*signal_setting_t)();
3958 signal_setting_t begin_signal_setting = NULL;
3959 signal_setting_t end_signal_setting = NULL;
3960 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3961 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3962 if (begin_signal_setting != NULL) {
3963 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3964 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3965 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3966 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3967 libjsig_is_loaded = true;
3968 assert(UseSignalChaining, "should enable signal-chaining");
3969 }
3970 if (libjsig_is_loaded) {
3971 // Tell libjsig jvm is setting signal handlers
3972 (*begin_signal_setting)();
3973 }
3974
3975 set_signal_handler(SIGSEGV, true, true);
3976 set_signal_handler(SIGPIPE, true, true);
3977 set_signal_handler(SIGXFSZ, true, true);
3978 set_signal_handler(SIGBUS, true, true);
3979 set_signal_handler(SIGILL, true, true);
3980 set_signal_handler(SIGFPE, true, true);
3981 set_signal_handler(ASYNC_SIGNAL, true, true);
3982
3983 if (libjsig_is_loaded) {
3984 // Tell libjsig jvm finishes setting signal handlers
3985 (*end_signal_setting)();
3986 }
3987
3988 // We don't activate signal checker if libjsig is in place, we trust ourselves
3989 // and if UserSignalHandler is installed all bets are off.
3990 // Log that signal checking is off only if -verbose:jni is specified.
3991 if (CheckJNICalls) {
3992 if (libjsig_is_loaded) {
3993 if (PrintJNIResolving) {
3994 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3995 }
3996 check_signals = false;
3997 }
3998 if (AllowUserSignalHandlers) {
3999 if (PrintJNIResolving) {
4000 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
4001 }
4002 check_signals = false;
4003 }
4004 }
4005 }
4006
4007
4008 void report_error(const char* file_name, int line_no, const char* title,
4009 const char* format, ...);
4010
4011 // (Static) wrappers for the liblgrp API
4012 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home;
4013 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init;
4014 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini;
4015 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root;
4016 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children;
4017 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources;
4018 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps;
4019 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale;
4020 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0;
4021
resolve_symbol_lazy(const char * name)4022 static address resolve_symbol_lazy(const char* name) {
4023 address addr = (address) dlsym(RTLD_DEFAULT, name);
4024 if (addr == NULL) {
4025 // RTLD_DEFAULT was not defined on some early versions of 2.5.1
4026 addr = (address) dlsym(RTLD_NEXT, name);
4027 }
4028 return addr;
4029 }
4030
resolve_symbol(const char * name)4031 static address resolve_symbol(const char* name) {
4032 address addr = resolve_symbol_lazy(name);
4033 if (addr == NULL) {
4034 fatal(dlerror());
4035 }
4036 return addr;
4037 }
4038
libthread_init()4039 void os::Solaris::libthread_init() {
4040 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators");
4041
4042 lwp_priocntl_init();
4043
4044 // RTLD_DEFAULT was not defined on some early versions of 5.5.1
4045 if (func == NULL) {
4046 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators");
4047 // Guarantee that this VM is running on an new enough OS (5.6 or
4048 // later) that it will have a new enough libthread.so.
4049 guarantee(func != NULL, "libthread.so is too old.");
4050 }
4051
4052 int size;
4053 void (*handler_info_func)(address *, int *);
4054 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo"));
4055 handler_info_func(&handler_start, &size);
4056 handler_end = handler_start + size;
4057 }
4058
4059
4060 int_fnP_mutex_tP os::Solaris::_mutex_lock;
4061 int_fnP_mutex_tP os::Solaris::_mutex_trylock;
4062 int_fnP_mutex_tP os::Solaris::_mutex_unlock;
4063 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init;
4064 int_fnP_mutex_tP os::Solaris::_mutex_destroy;
4065 int os::Solaris::_mutex_scope = USYNC_THREAD;
4066
4067 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait;
4068 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait;
4069 int_fnP_cond_tP os::Solaris::_cond_signal;
4070 int_fnP_cond_tP os::Solaris::_cond_broadcast;
4071 int_fnP_cond_tP_i_vP os::Solaris::_cond_init;
4072 int_fnP_cond_tP os::Solaris::_cond_destroy;
4073 int os::Solaris::_cond_scope = USYNC_THREAD;
4074 bool os::Solaris::_synchronization_initialized;
4075
synchronization_init()4076 void os::Solaris::synchronization_init() {
4077 if (UseLWPSynchronization) {
4078 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock")));
4079 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock")));
4080 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock")));
4081 os::Solaris::set_mutex_init(lwp_mutex_init);
4082 os::Solaris::set_mutex_destroy(lwp_mutex_destroy);
4083 os::Solaris::set_mutex_scope(USYNC_THREAD);
4084
4085 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait")));
4086 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait")));
4087 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal")));
4088 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast")));
4089 os::Solaris::set_cond_init(lwp_cond_init);
4090 os::Solaris::set_cond_destroy(lwp_cond_destroy);
4091 os::Solaris::set_cond_scope(USYNC_THREAD);
4092 } else {
4093 os::Solaris::set_mutex_scope(USYNC_THREAD);
4094 os::Solaris::set_cond_scope(USYNC_THREAD);
4095
4096 if (UsePthreads) {
4097 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock")));
4098 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock")));
4099 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock")));
4100 os::Solaris::set_mutex_init(pthread_mutex_default_init);
4101 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy")));
4102
4103 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait")));
4104 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait")));
4105 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal")));
4106 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast")));
4107 os::Solaris::set_cond_init(pthread_cond_default_init);
4108 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy")));
4109 } else {
4110 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock")));
4111 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock")));
4112 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock")));
4113 os::Solaris::set_mutex_init(::mutex_init);
4114 os::Solaris::set_mutex_destroy(::mutex_destroy);
4115
4116 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait")));
4117 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait")));
4118 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal")));
4119 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast")));
4120 os::Solaris::set_cond_init(::cond_init);
4121 os::Solaris::set_cond_destroy(::cond_destroy);
4122 }
4123 }
4124 _synchronization_initialized = true;
4125 }
4126
liblgrp_init()4127 bool os::Solaris::liblgrp_init() {
4128 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY);
4129 if (handle != NULL) {
4130 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home")));
4131 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init")));
4132 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini")));
4133 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root")));
4134 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children")));
4135 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources")));
4136 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps")));
4137 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t,
4138 dlsym(handle, "lgrp_cookie_stale")));
4139
4140 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER);
4141 set_lgrp_cookie(c);
4142 return true;
4143 }
4144 return false;
4145 }
4146
4147 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
4148 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
4149 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
4150
init_pset_getloadavg_ptr(void)4151 void init_pset_getloadavg_ptr(void) {
4152 pset_getloadavg_ptr =
4153 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
4154 if (pset_getloadavg_ptr == NULL) {
4155 log_warning(os)("pset_getloadavg function not found");
4156 }
4157 }
4158
4159 int os::Solaris::_dev_zero_fd = -1;
4160
4161 // this is called _before_ the global arguments have been parsed
init(void)4162 void os::init(void) {
4163 _initial_pid = getpid();
4164
4165 max_hrtime = first_hrtime = gethrtime();
4166
4167 init_random(1234567);
4168
4169 page_size = sysconf(_SC_PAGESIZE);
4170 if (page_size == -1) {
4171 fatal("os_solaris.cpp: os::init: sysconf failed (%s)", os::strerror(errno));
4172 }
4173 init_page_sizes((size_t) page_size);
4174
4175 Solaris::initialize_system_info();
4176
4177 int fd = ::open("/dev/zero", O_RDWR);
4178 if (fd < 0) {
4179 fatal("os::init: cannot open /dev/zero (%s)", os::strerror(errno));
4180 } else {
4181 Solaris::set_dev_zero_fd(fd);
4182
4183 // Close on exec, child won't inherit.
4184 fcntl(fd, F_SETFD, FD_CLOEXEC);
4185 }
4186
4187 clock_tics_per_sec = CLK_TCK;
4188
4189 // check if dladdr1() exists; dladdr1 can provide more information than
4190 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
4191 // and is available on linker patches for 5.7 and 5.8.
4192 // libdl.so must have been loaded, this call is just an entry lookup
4193 void * hdl = dlopen("libdl.so", RTLD_NOW);
4194 if (hdl) {
4195 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
4196 }
4197
4198 // main_thread points to the thread that created/loaded the JVM.
4199 main_thread = thr_self();
4200
4201 // dynamic lookup of functions that may not be available in our lowest
4202 // supported Solaris release
4203 void * handle = dlopen("libc.so.1", RTLD_LAZY);
4204 if (handle != NULL) {
4205 Solaris::_pthread_setname_np = // from 11.3
4206 (Solaris::pthread_setname_np_func_t)dlsym(handle, "pthread_setname_np");
4207 }
4208 }
4209
4210 // To install functions for atexit system call
4211 extern "C" {
perfMemory_exit_helper()4212 static void perfMemory_exit_helper() {
4213 perfMemory_exit();
4214 }
4215 }
4216
4217 // this is called _after_ the global arguments have been parsed
init_2(void)4218 jint os::init_2(void) {
4219 // try to enable extended file IO ASAP, see 6431278
4220 os::Solaris::try_enable_extended_io();
4221
4222 // Check and sets minimum stack sizes against command line options
4223 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
4224 return JNI_ERR;
4225 }
4226
4227 Solaris::libthread_init();
4228
4229 if (UseNUMA) {
4230 if (!Solaris::liblgrp_init()) {
4231 UseNUMA = false;
4232 } else {
4233 size_t lgrp_limit = os::numa_get_groups_num();
4234 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal);
4235 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
4236 FREE_C_HEAP_ARRAY(int, lgrp_ids);
4237 if (lgrp_num < 2) {
4238 // There's only one locality group, disable NUMA.
4239 UseNUMA = false;
4240 }
4241 }
4242 if (!UseNUMA && ForceNUMA) {
4243 UseNUMA = true;
4244 }
4245 }
4246
4247 Solaris::signal_sets_init();
4248 Solaris::init_signal_mem();
4249 Solaris::install_signal_handlers();
4250 // Initialize data for jdk.internal.misc.Signal
4251 if (!ReduceSignalUsage) {
4252 jdk_misc_signal_init();
4253 }
4254
4255 // initialize synchronization primitives to use either thread or
4256 // lwp synchronization (controlled by UseLWPSynchronization)
4257 Solaris::synchronization_init();
4258
4259 if (MaxFDLimit) {
4260 // set the number of file descriptors to max. print out error
4261 // if getrlimit/setrlimit fails but continue regardless.
4262 struct rlimit nbr_files;
4263 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
4264 if (status != 0) {
4265 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
4266 } else {
4267 nbr_files.rlim_cur = nbr_files.rlim_max;
4268 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
4269 if (status != 0) {
4270 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
4271 }
4272 }
4273 }
4274
4275 // Calculate theoretical max. size of Threads to guard gainst
4276 // artifical out-of-memory situations, where all available address-
4277 // space has been reserved by thread stacks. Default stack size is 1Mb.
4278 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
4279 JavaThread::stack_size_at_create() : (1*K*K);
4280 assert(pre_thread_stack_size != 0, "Must have a stack");
4281 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
4282 // we should start doing Virtual Memory banging. Currently when the threads will
4283 // have used all but 200Mb of space.
4284 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
4285 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
4286
4287 // at-exit methods are called in the reverse order of their registration.
4288 // In Solaris 7 and earlier, atexit functions are called on return from
4289 // main or as a result of a call to exit(3C). There can be only 32 of
4290 // these functions registered and atexit() does not set errno. In Solaris
4291 // 8 and later, there is no limit to the number of functions registered
4292 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
4293 // functions are called upon dlclose(3DL) in addition to return from main
4294 // and exit(3C).
4295
4296 if (PerfAllowAtExitRegistration) {
4297 // only register atexit functions if PerfAllowAtExitRegistration is set.
4298 // atexit functions can be delayed until process exit time, which
4299 // can be problematic for embedded VM situations. Embedded VMs should
4300 // call DestroyJavaVM() to assure that VM resources are released.
4301
4302 // note: perfMemory_exit_helper atexit function may be removed in
4303 // the future if the appropriate cleanup code can be added to the
4304 // VM_Exit VMOperation's doit method.
4305 if (atexit(perfMemory_exit_helper) != 0) {
4306 warning("os::init2 atexit(perfMemory_exit_helper) failed");
4307 }
4308 }
4309
4310 // Init pset_loadavg function pointer
4311 init_pset_getloadavg_ptr();
4312
4313 return JNI_OK;
4314 }
4315
4316 // Mark the polling page as unreadable
make_polling_page_unreadable(void)4317 void os::make_polling_page_unreadable(void) {
4318 Events::log(NULL, "Protecting polling page " INTPTR_FORMAT " with PROT_NONE", p2i(_polling_page));
4319 if (mprotect((char *)_polling_page, page_size, PROT_NONE) != 0) {
4320 fatal("Could not disable polling page");
4321 }
4322 }
4323
4324 // Mark the polling page as readable
make_polling_page_readable(void)4325 void os::make_polling_page_readable(void) {
4326 Events::log(NULL, "Protecting polling page " INTPTR_FORMAT " with PROT_READ", p2i(_polling_page));
4327 if (mprotect((char *)_polling_page, page_size, PROT_READ) != 0) {
4328 fatal("Could not enable polling page");
4329 }
4330 }
4331
4332 // Is a (classpath) directory empty?
dir_is_empty(const char * path)4333 bool os::dir_is_empty(const char* path) {
4334 DIR *dir = NULL;
4335 struct dirent *ptr;
4336
4337 dir = opendir(path);
4338 if (dir == NULL) return true;
4339
4340 // Scan the directory
4341 bool result = true;
4342 while (result && (ptr = readdir(dir)) != NULL) {
4343 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
4344 result = false;
4345 }
4346 }
4347 closedir(dir);
4348 return result;
4349 }
4350
4351 // This code originates from JDK's sysOpen and open64_w
4352 // from src/solaris/hpi/src/system_md.c
4353
open(const char * path,int oflag,int mode)4354 int os::open(const char *path, int oflag, int mode) {
4355 if (strlen(path) > MAX_PATH - 1) {
4356 errno = ENAMETOOLONG;
4357 return -1;
4358 }
4359 int fd;
4360
4361 fd = ::open64(path, oflag, mode);
4362 if (fd == -1) return -1;
4363
4364 // If the open succeeded, the file might still be a directory
4365 {
4366 struct stat64 buf64;
4367 int ret = ::fstat64(fd, &buf64);
4368 int st_mode = buf64.st_mode;
4369
4370 if (ret != -1) {
4371 if ((st_mode & S_IFMT) == S_IFDIR) {
4372 errno = EISDIR;
4373 ::close(fd);
4374 return -1;
4375 }
4376 } else {
4377 ::close(fd);
4378 return -1;
4379 }
4380 }
4381
4382 // 32-bit Solaris systems suffer from:
4383 //
4384 // - an historical default soft limit of 256 per-process file
4385 // descriptors that is too low for many Java programs.
4386 //
4387 // - a design flaw where file descriptors created using stdio
4388 // fopen must be less than 256, _even_ when the first limit above
4389 // has been raised. This can cause calls to fopen (but not calls to
4390 // open, for example) to fail mysteriously, perhaps in 3rd party
4391 // native code (although the JDK itself uses fopen). One can hardly
4392 // criticize them for using this most standard of all functions.
4393 //
4394 // We attempt to make everything work anyways by:
4395 //
4396 // - raising the soft limit on per-process file descriptors beyond
4397 // 256
4398 //
4399 // - As of Solaris 10u4, we can request that Solaris raise the 256
4400 // stdio fopen limit by calling function enable_extended_FILE_stdio.
4401 // This is done in init_2 and recorded in enabled_extended_FILE_stdio
4402 //
4403 // - If we are stuck on an old (pre 10u4) Solaris system, we can
4404 // workaround the bug by remapping non-stdio file descriptors below
4405 // 256 to ones beyond 256, which is done below.
4406 //
4407 // See:
4408 // 1085341: 32-bit stdio routines should support file descriptors >255
4409 // 6533291: Work around 32-bit Solaris stdio limit of 256 open files
4410 // 6431278: Netbeans crash on 32 bit Solaris: need to call
4411 // enable_extended_FILE_stdio() in VM initialisation
4412 // Giri Mandalika's blog
4413 // http://technopark02.blogspot.com/2005_05_01_archive.html
4414 //
4415 #ifndef _LP64
4416 if ((!enabled_extended_FILE_stdio) && fd < 256) {
4417 int newfd = ::fcntl(fd, F_DUPFD, 256);
4418 if (newfd != -1) {
4419 ::close(fd);
4420 fd = newfd;
4421 }
4422 }
4423 #endif // 32-bit Solaris
4424
4425 // All file descriptors that are opened in the JVM and not
4426 // specifically destined for a subprocess should have the
4427 // close-on-exec flag set. If we don't set it, then careless 3rd
4428 // party native code might fork and exec without closing all
4429 // appropriate file descriptors (e.g. as we do in closeDescriptors in
4430 // UNIXProcess.c), and this in turn might:
4431 //
4432 // - cause end-of-file to fail to be detected on some file
4433 // descriptors, resulting in mysterious hangs, or
4434 //
4435 // - might cause an fopen in the subprocess to fail on a system
4436 // suffering from bug 1085341.
4437 //
4438 // (Yes, the default setting of the close-on-exec flag is a Unix
4439 // design flaw)
4440 //
4441 // See:
4442 // 1085341: 32-bit stdio routines should support file descriptors >255
4443 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
4444 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
4445 //
4446 #ifdef FD_CLOEXEC
4447 {
4448 int flags = ::fcntl(fd, F_GETFD);
4449 if (flags != -1) {
4450 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
4451 }
4452 }
4453 #endif
4454
4455 return fd;
4456 }
4457
4458 // create binary file, rewriting existing file if required
create_binary_file(const char * path,bool rewrite_existing)4459 int os::create_binary_file(const char* path, bool rewrite_existing) {
4460 int oflags = O_WRONLY | O_CREAT;
4461 if (!rewrite_existing) {
4462 oflags |= O_EXCL;
4463 }
4464 return ::open64(path, oflags, S_IREAD | S_IWRITE);
4465 }
4466
4467 // return current position of file pointer
current_file_offset(int fd)4468 jlong os::current_file_offset(int fd) {
4469 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
4470 }
4471
4472 // move file pointer to the specified offset
seek_to_file_offset(int fd,jlong offset)4473 jlong os::seek_to_file_offset(int fd, jlong offset) {
4474 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
4475 }
4476
lseek(int fd,jlong offset,int whence)4477 jlong os::lseek(int fd, jlong offset, int whence) {
4478 return (jlong) ::lseek64(fd, offset, whence);
4479 }
4480
ftruncate(int fd,jlong length)4481 int os::ftruncate(int fd, jlong length) {
4482 return ::ftruncate64(fd, length);
4483 }
4484
fsync(int fd)4485 int os::fsync(int fd) {
4486 RESTARTABLE_RETURN_INT(::fsync(fd));
4487 }
4488
available(int fd,jlong * bytes)4489 int os::available(int fd, jlong *bytes) {
4490 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
4491 "Assumed _thread_in_native");
4492 jlong cur, end;
4493 int mode;
4494 struct stat64 buf64;
4495
4496 if (::fstat64(fd, &buf64) >= 0) {
4497 mode = buf64.st_mode;
4498 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
4499 int n,ioctl_return;
4500
4501 RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return);
4502 if (ioctl_return>= 0) {
4503 *bytes = n;
4504 return 1;
4505 }
4506 }
4507 }
4508 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
4509 return 0;
4510 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
4511 return 0;
4512 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
4513 return 0;
4514 }
4515 *bytes = end - cur;
4516 return 1;
4517 }
4518
4519 // Map a block of memory.
pd_map_memory(int fd,const char * file_name,size_t file_offset,char * addr,size_t bytes,bool read_only,bool allow_exec)4520 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4521 char *addr, size_t bytes, bool read_only,
4522 bool allow_exec) {
4523 int prot;
4524 int flags;
4525
4526 if (read_only) {
4527 prot = PROT_READ;
4528 flags = MAP_SHARED;
4529 } else {
4530 prot = PROT_READ | PROT_WRITE;
4531 flags = MAP_PRIVATE;
4532 }
4533
4534 if (allow_exec) {
4535 prot |= PROT_EXEC;
4536 }
4537
4538 if (addr != NULL) {
4539 flags |= MAP_FIXED;
4540 }
4541
4542 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
4543 fd, file_offset);
4544 if (mapped_address == MAP_FAILED) {
4545 return NULL;
4546 }
4547 return mapped_address;
4548 }
4549
4550
4551 // Remap a block of memory.
pd_remap_memory(int fd,const char * file_name,size_t file_offset,char * addr,size_t bytes,bool read_only,bool allow_exec)4552 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4553 char *addr, size_t bytes, bool read_only,
4554 bool allow_exec) {
4555 // same as map_memory() on this OS
4556 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
4557 allow_exec);
4558 }
4559
4560
4561 // Unmap a block of memory.
pd_unmap_memory(char * addr,size_t bytes)4562 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4563 return munmap(addr, bytes) == 0;
4564 }
4565
pause()4566 void os::pause() {
4567 char filename[MAX_PATH];
4568 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4569 jio_snprintf(filename, MAX_PATH, "%s", PauseAtStartupFile);
4570 } else {
4571 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4572 }
4573
4574 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4575 if (fd != -1) {
4576 struct stat buf;
4577 ::close(fd);
4578 while (::stat(filename, &buf) == 0) {
4579 (void)::poll(NULL, 0, 100);
4580 }
4581 } else {
4582 jio_fprintf(stderr,
4583 "Could not open pause file '%s', continuing immediately.\n", filename);
4584 }
4585 }
4586
4587 #ifndef PRODUCT
4588 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
4589 // Turn this on if you need to trace synch operations.
4590 // Set RECORD_SYNCH_LIMIT to a large-enough value,
4591 // and call record_synch_enable and record_synch_disable
4592 // around the computation of interest.
4593
4594 void record_synch(char* name, bool returning); // defined below
4595
4596 class RecordSynch {
4597 char* _name;
4598 public:
RecordSynch(char * name)4599 RecordSynch(char* name) :_name(name) { record_synch(_name, false); }
~RecordSynch()4600 ~RecordSynch() { record_synch(_name, true); }
4601 };
4602
4603 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \
4604 extern "C" ret name params { \
4605 typedef ret name##_t params; \
4606 static name##_t* implem = NULL; \
4607 static int callcount = 0; \
4608 if (implem == NULL) { \
4609 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \
4610 if (implem == NULL) fatal(dlerror()); \
4611 } \
4612 ++callcount; \
4613 RecordSynch _rs(#name); \
4614 inner; \
4615 return implem args; \
4616 }
4617 // in dbx, examine callcounts this way:
4618 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
4619
4620 #define CHECK_POINTER_OK(p) \
4621 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p)))
4622 #define CHECK_MU \
4623 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
4624 #define CHECK_CV \
4625 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
4626 #define CHECK_P(p) \
4627 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only.");
4628
4629 #define CHECK_MUTEX(mutex_op) \
4630 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
4631
4632 CHECK_MUTEX( mutex_lock)
4633 CHECK_MUTEX( _mutex_lock)
4634 CHECK_MUTEX( mutex_unlock)
4635 CHECK_MUTEX(_mutex_unlock)
4636 CHECK_MUTEX( mutex_trylock)
4637 CHECK_MUTEX(_mutex_trylock)
4638
4639 #define CHECK_COND(cond_op) \
4640 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU; CHECK_CV);
4641
4642 CHECK_COND( cond_wait);
4643 CHECK_COND(_cond_wait);
4644 CHECK_COND(_cond_wait_cancel);
4645
4646 #define CHECK_COND2(cond_op) \
4647 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU; CHECK_CV);
4648
4649 CHECK_COND2( cond_timedwait);
4650 CHECK_COND2(_cond_timedwait);
4651 CHECK_COND2(_cond_timedwait_cancel);
4652
4653 // do the _lwp_* versions too
4654 #define mutex_t lwp_mutex_t
4655 #define cond_t lwp_cond_t
4656 CHECK_MUTEX( _lwp_mutex_lock)
4657 CHECK_MUTEX( _lwp_mutex_unlock)
4658 CHECK_MUTEX( _lwp_mutex_trylock)
4659 CHECK_MUTEX( __lwp_mutex_lock)
4660 CHECK_MUTEX( __lwp_mutex_unlock)
4661 CHECK_MUTEX( __lwp_mutex_trylock)
4662 CHECK_MUTEX(___lwp_mutex_lock)
4663 CHECK_MUTEX(___lwp_mutex_unlock)
4664
4665 CHECK_COND( _lwp_cond_wait);
4666 CHECK_COND( __lwp_cond_wait);
4667 CHECK_COND(___lwp_cond_wait);
4668
4669 CHECK_COND2( _lwp_cond_timedwait);
4670 CHECK_COND2( __lwp_cond_timedwait);
4671 #undef mutex_t
4672 #undef cond_t
4673
4674 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
4675 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
4676 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0);
4677 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0);
4678 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
4679 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
4680 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
4681 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
4682
4683
4684 // recording machinery:
4685
4686 enum { RECORD_SYNCH_LIMIT = 200 };
4687 char* record_synch_name[RECORD_SYNCH_LIMIT];
4688 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
4689 bool record_synch_returning[RECORD_SYNCH_LIMIT];
4690 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
4691 int record_synch_count = 0;
4692 bool record_synch_enabled = false;
4693
4694 // in dbx, examine recorded data this way:
4695 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
4696
record_synch(char * name,bool returning)4697 void record_synch(char* name, bool returning) {
4698 if (record_synch_enabled) {
4699 if (record_synch_count < RECORD_SYNCH_LIMIT) {
4700 record_synch_name[record_synch_count] = name;
4701 record_synch_returning[record_synch_count] = returning;
4702 record_synch_thread[record_synch_count] = thr_self();
4703 record_synch_arg0ptr[record_synch_count] = &name;
4704 record_synch_count++;
4705 }
4706 // put more checking code here:
4707 // ...
4708 }
4709 }
4710
record_synch_enable()4711 void record_synch_enable() {
4712 // start collecting trace data, if not already doing so
4713 if (!record_synch_enabled) record_synch_count = 0;
4714 record_synch_enabled = true;
4715 }
4716
record_synch_disable()4717 void record_synch_disable() {
4718 // stop collecting trace data
4719 record_synch_enabled = false;
4720 }
4721
4722 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
4723 #endif // PRODUCT
4724
4725 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
4726 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
4727 (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
4728
4729
4730 // JVMTI & JVM monitoring and management support
4731 // The thread_cpu_time() and current_thread_cpu_time() are only
4732 // supported if is_thread_cpu_time_supported() returns true.
4733 // They are not supported on Solaris T1.
4734
4735 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4736 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4737 // of a thread.
4738 //
4739 // current_thread_cpu_time() and thread_cpu_time(Thread *)
4740 // returns the fast estimate available on the platform.
4741
4742 // hrtime_t gethrvtime() return value includes
4743 // user time but does not include system time
current_thread_cpu_time()4744 jlong os::current_thread_cpu_time() {
4745 return (jlong) gethrvtime();
4746 }
4747
thread_cpu_time(Thread * thread)4748 jlong os::thread_cpu_time(Thread *thread) {
4749 // return user level CPU time only to be consistent with
4750 // what current_thread_cpu_time returns.
4751 // thread_cpu_time_info() must be changed if this changes
4752 return os::thread_cpu_time(thread, false /* user time only */);
4753 }
4754
current_thread_cpu_time(bool user_sys_cpu_time)4755 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4756 if (user_sys_cpu_time) {
4757 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4758 } else {
4759 return os::current_thread_cpu_time();
4760 }
4761 }
4762
thread_cpu_time(Thread * thread,bool user_sys_cpu_time)4763 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
4764 char proc_name[64];
4765 int count;
4766 prusage_t prusage;
4767 jlong lwp_time;
4768 int fd;
4769
4770 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
4771 getpid(),
4772 thread->osthread()->lwp_id());
4773 fd = ::open(proc_name, O_RDONLY);
4774 if (fd == -1) return -1;
4775
4776 do {
4777 count = ::pread(fd,
4778 (void *)&prusage.pr_utime,
4779 thr_time_size,
4780 thr_time_off);
4781 } while (count < 0 && errno == EINTR);
4782 ::close(fd);
4783 if (count < 0) return -1;
4784
4785 if (user_sys_cpu_time) {
4786 // user + system CPU time
4787 lwp_time = (((jlong)prusage.pr_stime.tv_sec +
4788 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
4789 (jlong)prusage.pr_stime.tv_nsec +
4790 (jlong)prusage.pr_utime.tv_nsec;
4791 } else {
4792 // user level CPU time only
4793 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
4794 (jlong)prusage.pr_utime.tv_nsec;
4795 }
4796
4797 return (lwp_time);
4798 }
4799
current_thread_cpu_time_info(jvmtiTimerInfo * info_ptr)4800 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4801 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4802 info_ptr->may_skip_backward = false; // elapsed time not wall time
4803 info_ptr->may_skip_forward = false; // elapsed time not wall time
4804 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
4805 }
4806
thread_cpu_time_info(jvmtiTimerInfo * info_ptr)4807 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4808 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4809 info_ptr->may_skip_backward = false; // elapsed time not wall time
4810 info_ptr->may_skip_forward = false; // elapsed time not wall time
4811 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
4812 }
4813
is_thread_cpu_time_supported()4814 bool os::is_thread_cpu_time_supported() {
4815 return true;
4816 }
4817
4818 // System loadavg support. Returns -1 if load average cannot be obtained.
4819 // Return the load average for our processor set if the primitive exists
4820 // (Solaris 9 and later). Otherwise just return system wide loadavg.
loadavg(double loadavg[],int nelem)4821 int os::loadavg(double loadavg[], int nelem) {
4822 if (pset_getloadavg_ptr != NULL) {
4823 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
4824 } else {
4825 return ::getloadavg(loadavg, nelem);
4826 }
4827 }
4828
4829 //---------------------------------------------------------------------------------
4830
find(address addr,outputStream * st)4831 bool os::find(address addr, outputStream* st) {
4832 Dl_info dlinfo;
4833 memset(&dlinfo, 0, sizeof(dlinfo));
4834 if (dladdr(addr, &dlinfo) != 0) {
4835 st->print(PTR_FORMAT ": ", addr);
4836 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
4837 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
4838 } else if (dlinfo.dli_fbase != NULL) {
4839 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
4840 } else {
4841 st->print("<absolute address>");
4842 }
4843 if (dlinfo.dli_fname != NULL) {
4844 st->print(" in %s", dlinfo.dli_fname);
4845 }
4846 if (dlinfo.dli_fbase != NULL) {
4847 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
4848 }
4849 st->cr();
4850
4851 if (Verbose) {
4852 // decode some bytes around the PC
4853 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
4854 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
4855 address lowest = (address) dlinfo.dli_sname;
4856 if (!lowest) lowest = (address) dlinfo.dli_fbase;
4857 if (begin < lowest) begin = lowest;
4858 Dl_info dlinfo2;
4859 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
4860 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) {
4861 end = (address) dlinfo2.dli_saddr;
4862 }
4863 Disassembler::decode(begin, end, st);
4864 }
4865 return true;
4866 }
4867 return false;
4868 }
4869
4870 // Following function has been added to support HotSparc's libjvm.so running
4871 // under Solaris production JDK 1.2.2 / 1.3.0. These came from
4872 // src/solaris/hpi/native_threads in the EVM codebase.
4873 //
4874 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
4875 // libraries and should thus be removed. We will leave it behind for a while
4876 // until we no longer want to able to run on top of 1.3.0 Solaris production
4877 // JDK. See 4341971.
4878
4879 #define STACK_SLACK 0x800
4880
4881 extern "C" {
sysThreadAvailableStackWithSlack()4882 intptr_t sysThreadAvailableStackWithSlack() {
4883 stack_t st;
4884 intptr_t retval, stack_top;
4885 retval = thr_stksegment(&st);
4886 assert(retval == 0, "incorrect return value from thr_stksegment");
4887 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
4888 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
4889 stack_top=(intptr_t)st.ss_sp-st.ss_size;
4890 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
4891 }
4892 }
4893
4894 // ObjectMonitor park-unpark infrastructure ...
4895 //
4896 // We implement Solaris and Linux PlatformEvents with the
4897 // obvious condvar-mutex-flag triple.
4898 // Another alternative that works quite well is pipes:
4899 // Each PlatformEvent consists of a pipe-pair.
4900 // The thread associated with the PlatformEvent
4901 // calls park(), which reads from the input end of the pipe.
4902 // Unpark() writes into the other end of the pipe.
4903 // The write-side of the pipe must be set NDELAY.
4904 // Unfortunately pipes consume a large # of handles.
4905 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
4906 // Using pipes for the 1st few threads might be workable, however.
4907 //
4908 // park() is permitted to return spuriously.
4909 // Callers of park() should wrap the call to park() in
4910 // an appropriate loop. A litmus test for the correct
4911 // usage of park is the following: if park() were modified
4912 // to immediately return 0 your code should still work,
4913 // albeit degenerating to a spin loop.
4914 //
4915 // In a sense, park()-unpark() just provides more polite spinning
4916 // and polling with the key difference over naive spinning being
4917 // that a parked thread needs to be explicitly unparked() in order
4918 // to wake up and to poll the underlying condition.
4919 //
4920 // Assumption:
4921 // Only one parker can exist on an event, which is why we allocate
4922 // them per-thread. Multiple unparkers can coexist.
4923 //
4924 // _Event transitions in park()
4925 // -1 => -1 : illegal
4926 // 1 => 0 : pass - return immediately
4927 // 0 => -1 : block; then set _Event to 0 before returning
4928 //
4929 // _Event transitions in unpark()
4930 // 0 => 1 : just return
4931 // 1 => 1 : just return
4932 // -1 => either 0 or 1; must signal target thread
4933 // That is, we can safely transition _Event from -1 to either
4934 // 0 or 1.
4935 //
4936 // _Event serves as a restricted-range semaphore.
4937 // -1 : thread is blocked, i.e. there is a waiter
4938 // 0 : neutral: thread is running or ready,
4939 // could have been signaled after a wait started
4940 // 1 : signaled - thread is running or ready
4941 //
4942 // Another possible encoding of _Event would be with
4943 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
4944 //
4945 // TODO-FIXME: add DTRACE probes for:
4946 // 1. Tx parks
4947 // 2. Ty unparks Tx
4948 // 3. Tx resumes from park
4949
4950
4951 // value determined through experimentation
4952 #define ROUNDINGFIX 11
4953
4954 // utility to compute the abstime argument to timedwait.
4955 // TODO-FIXME: switch from compute_abstime() to unpackTime().
4956
compute_abstime(timestruc_t * abstime,jlong millis)4957 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
4958 // millis is the relative timeout time
4959 // abstime will be the absolute timeout time
4960 if (millis < 0) millis = 0;
4961 struct timeval now;
4962 int status = gettimeofday(&now, NULL);
4963 assert(status == 0, "gettimeofday");
4964 jlong seconds = millis / 1000;
4965 jlong max_wait_period;
4966
4967 if (UseLWPSynchronization) {
4968 // forward port of fix for 4275818 (not sleeping long enough)
4969 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
4970 // _lwp_cond_timedwait() used a round_down algorithm rather
4971 // than a round_up. For millis less than our roundfactor
4972 // it rounded down to 0 which doesn't meet the spec.
4973 // For millis > roundfactor we may return a bit sooner, but
4974 // since we can not accurately identify the patch level and
4975 // this has already been fixed in Solaris 9 and 8 we will
4976 // leave it alone rather than always rounding down.
4977
4978 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
4979 // It appears that when we go directly through Solaris _lwp_cond_timedwait()
4980 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
4981 max_wait_period = 21000000;
4982 } else {
4983 max_wait_period = 50000000;
4984 }
4985 millis %= 1000;
4986 if (seconds > max_wait_period) { // see man cond_timedwait(3T)
4987 seconds = max_wait_period;
4988 }
4989 abstime->tv_sec = now.tv_sec + seconds;
4990 long usec = now.tv_usec + millis * 1000;
4991 if (usec >= 1000000) {
4992 abstime->tv_sec += 1;
4993 usec -= 1000000;
4994 }
4995 abstime->tv_nsec = usec * 1000;
4996 return abstime;
4997 }
4998
park()4999 void os::PlatformEvent::park() { // AKA: down()
5000 // Transitions for _Event:
5001 // -1 => -1 : illegal
5002 // 1 => 0 : pass - return immediately
5003 // 0 => -1 : block; then set _Event to 0 before returning
5004
5005 // Invariant: Only the thread associated with the Event/PlatformEvent
5006 // may call park().
5007 assert(_nParked == 0, "invariant");
5008
5009 int v;
5010 for (;;) {
5011 v = _Event;
5012 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5013 }
5014 guarantee(v >= 0, "invariant");
5015 if (v == 0) {
5016 // Do this the hard way by blocking ...
5017 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5018 int status = os::Solaris::mutex_lock(_mutex);
5019 assert_status(status == 0, status, "mutex_lock");
5020 guarantee(_nParked == 0, "invariant");
5021 ++_nParked;
5022 while (_Event < 0) {
5023 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
5024 // Treat this the same as if the wait was interrupted
5025 // With usr/lib/lwp going to kernel, always handle ETIME
5026 status = os::Solaris::cond_wait(_cond, _mutex);
5027 if (status == ETIME) status = EINTR;
5028 assert_status(status == 0 || status == EINTR, status, "cond_wait");
5029 }
5030 --_nParked;
5031 _Event = 0;
5032 status = os::Solaris::mutex_unlock(_mutex);
5033 assert_status(status == 0, status, "mutex_unlock");
5034 // Paranoia to ensure our locked and lock-free paths interact
5035 // correctly with each other.
5036 OrderAccess::fence();
5037 }
5038 }
5039
park(jlong millis)5040 int os::PlatformEvent::park(jlong millis) {
5041 // Transitions for _Event:
5042 // -1 => -1 : illegal
5043 // 1 => 0 : pass - return immediately
5044 // 0 => -1 : block; then set _Event to 0 before returning
5045
5046 guarantee(_nParked == 0, "invariant");
5047 int v;
5048 for (;;) {
5049 v = _Event;
5050 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5051 }
5052 guarantee(v >= 0, "invariant");
5053 if (v != 0) return OS_OK;
5054
5055 int ret = OS_TIMEOUT;
5056 timestruc_t abst;
5057 compute_abstime(&abst, millis);
5058
5059 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5060 int status = os::Solaris::mutex_lock(_mutex);
5061 assert_status(status == 0, status, "mutex_lock");
5062 guarantee(_nParked == 0, "invariant");
5063 ++_nParked;
5064 while (_Event < 0) {
5065 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
5066 assert_status(status == 0 || status == EINTR ||
5067 status == ETIME || status == ETIMEDOUT,
5068 status, "cond_timedwait");
5069 if (!FilterSpuriousWakeups) break; // previous semantics
5070 if (status == ETIME || status == ETIMEDOUT) break;
5071 // We consume and ignore EINTR and spurious wakeups.
5072 }
5073 --_nParked;
5074 if (_Event >= 0) ret = OS_OK;
5075 _Event = 0;
5076 status = os::Solaris::mutex_unlock(_mutex);
5077 assert_status(status == 0, status, "mutex_unlock");
5078 // Paranoia to ensure our locked and lock-free paths interact
5079 // correctly with each other.
5080 OrderAccess::fence();
5081 return ret;
5082 }
5083
unpark()5084 void os::PlatformEvent::unpark() {
5085 // Transitions for _Event:
5086 // 0 => 1 : just return
5087 // 1 => 1 : just return
5088 // -1 => either 0 or 1; must signal target thread
5089 // That is, we can safely transition _Event from -1 to either
5090 // 0 or 1.
5091 // See also: "Semaphores in Plan 9" by Mullender & Cox
5092 //
5093 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5094 // that it will take two back-to-back park() calls for the owning
5095 // thread to block. This has the benefit of forcing a spurious return
5096 // from the first park() call after an unpark() call which will help
5097 // shake out uses of park() and unpark() without condition variables.
5098
5099 if (Atomic::xchg(1, &_Event) >= 0) return;
5100
5101 // If the thread associated with the event was parked, wake it.
5102 // Wait for the thread assoc with the PlatformEvent to vacate.
5103 int status = os::Solaris::mutex_lock(_mutex);
5104 assert_status(status == 0, status, "mutex_lock");
5105 int AnyWaiters = _nParked;
5106 status = os::Solaris::mutex_unlock(_mutex);
5107 assert_status(status == 0, status, "mutex_unlock");
5108 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
5109 if (AnyWaiters != 0) {
5110 // Note that we signal() *after* dropping the lock for "immortal" Events.
5111 // This is safe and avoids a common class of futile wakeups. In rare
5112 // circumstances this can cause a thread to return prematurely from
5113 // cond_{timed}wait() but the spurious wakeup is benign and the victim
5114 // will simply re-test the condition and re-park itself.
5115 // This provides particular benefit if the underlying platform does not
5116 // provide wait morphing.
5117 status = os::Solaris::cond_signal(_cond);
5118 assert_status(status == 0, status, "cond_signal");
5119 }
5120 }
5121
5122 // JSR166
5123 // -------------------------------------------------------
5124
5125 // The solaris and linux implementations of park/unpark are fairly
5126 // conservative for now, but can be improved. They currently use a
5127 // mutex/condvar pair, plus _counter.
5128 // Park decrements _counter if > 0, else does a condvar wait. Unpark
5129 // sets count to 1 and signals condvar. Only one thread ever waits
5130 // on the condvar. Contention seen when trying to park implies that someone
5131 // is unparking you, so don't wait. And spurious returns are fine, so there
5132 // is no need to track notifications.
5133
5134 #define MAX_SECS 100000000
5135
5136 // This code is common to linux and solaris and will be moved to a
5137 // common place in dolphin.
5138 //
5139 // The passed in time value is either a relative time in nanoseconds
5140 // or an absolute time in milliseconds. Either way it has to be unpacked
5141 // into suitable seconds and nanoseconds components and stored in the
5142 // given timespec structure.
5143 // Given time is a 64-bit value and the time_t used in the timespec is only
5144 // a signed-32-bit value (except on 64-bit Linux) we have to watch for
5145 // overflow if times way in the future are given. Further on Solaris versions
5146 // prior to 10 there is a restriction (see cond_timedwait) that the specified
5147 // number of seconds, in abstime, is less than current_time + 100,000,000.
5148 // As it will be 28 years before "now + 100000000" will overflow we can
5149 // ignore overflow and just impose a hard-limit on seconds using the value
5150 // of "now + 100,000,000". This places a limit on the timeout of about 3.17
5151 // years from "now".
5152 //
unpackTime(timespec * absTime,bool isAbsolute,jlong time)5153 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
5154 assert(time > 0, "convertTime");
5155
5156 struct timeval now;
5157 int status = gettimeofday(&now, NULL);
5158 assert(status == 0, "gettimeofday");
5159
5160 time_t max_secs = now.tv_sec + MAX_SECS;
5161
5162 if (isAbsolute) {
5163 jlong secs = time / 1000;
5164 if (secs > max_secs) {
5165 absTime->tv_sec = max_secs;
5166 } else {
5167 absTime->tv_sec = secs;
5168 }
5169 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
5170 } else {
5171 jlong secs = time / NANOSECS_PER_SEC;
5172 if (secs >= MAX_SECS) {
5173 absTime->tv_sec = max_secs;
5174 absTime->tv_nsec = 0;
5175 } else {
5176 absTime->tv_sec = now.tv_sec + secs;
5177 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
5178 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
5179 absTime->tv_nsec -= NANOSECS_PER_SEC;
5180 ++absTime->tv_sec; // note: this must be <= max_secs
5181 }
5182 }
5183 }
5184 assert(absTime->tv_sec >= 0, "tv_sec < 0");
5185 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
5186 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
5187 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
5188 }
5189
park(bool isAbsolute,jlong time)5190 void Parker::park(bool isAbsolute, jlong time) {
5191 // Ideally we'd do something useful while spinning, such
5192 // as calling unpackTime().
5193
5194 // Optional fast-path check:
5195 // Return immediately if a permit is available.
5196 // We depend on Atomic::xchg() having full barrier semantics
5197 // since we are doing a lock-free update to _counter.
5198 if (Atomic::xchg(0, &_counter) > 0) return;
5199
5200 // Optional fast-exit: Check interrupt before trying to wait
5201 Thread* thread = Thread::current();
5202 assert(thread->is_Java_thread(), "Must be JavaThread");
5203 JavaThread *jt = (JavaThread *)thread;
5204 if (Thread::is_interrupted(thread, false)) {
5205 return;
5206 }
5207
5208 // First, demultiplex/decode time arguments
5209 timespec absTime;
5210 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all
5211 return;
5212 }
5213 if (time > 0) {
5214 // Warning: this code might be exposed to the old Solaris time
5215 // round-down bugs. Grep "roundingFix" for details.
5216 unpackTime(&absTime, isAbsolute, time);
5217 }
5218
5219 // Enter safepoint region
5220 // Beware of deadlocks such as 6317397.
5221 // The per-thread Parker:: _mutex is a classic leaf-lock.
5222 // In particular a thread must never block on the Threads_lock while
5223 // holding the Parker:: mutex. If safepoints are pending both the
5224 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
5225 ThreadBlockInVM tbivm(jt);
5226
5227 // Don't wait if cannot get lock since interference arises from
5228 // unblocking. Also. check interrupt before trying wait
5229 if (Thread::is_interrupted(thread, false) ||
5230 os::Solaris::mutex_trylock(_mutex) != 0) {
5231 return;
5232 }
5233
5234 int status;
5235
5236 if (_counter > 0) { // no wait needed
5237 _counter = 0;
5238 status = os::Solaris::mutex_unlock(_mutex);
5239 assert(status == 0, "invariant");
5240 // Paranoia to ensure our locked and lock-free paths interact
5241 // correctly with each other and Java-level accesses.
5242 OrderAccess::fence();
5243 return;
5244 }
5245
5246 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5247 jt->set_suspend_equivalent();
5248 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
5249
5250 // Do this the hard way by blocking ...
5251 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5252 if (time == 0) {
5253 status = os::Solaris::cond_wait(_cond, _mutex);
5254 } else {
5255 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
5256 }
5257 // Note that an untimed cond_wait() can sometimes return ETIME on older
5258 // versions of the Solaris.
5259 assert_status(status == 0 || status == EINTR ||
5260 status == ETIME || status == ETIMEDOUT,
5261 status, "cond_timedwait");
5262
5263 _counter = 0;
5264 status = os::Solaris::mutex_unlock(_mutex);
5265 assert_status(status == 0, status, "mutex_unlock");
5266 // Paranoia to ensure our locked and lock-free paths interact
5267 // correctly with each other and Java-level accesses.
5268 OrderAccess::fence();
5269
5270 // If externally suspended while waiting, re-suspend
5271 if (jt->handle_special_suspend_equivalent_condition()) {
5272 jt->java_suspend_self();
5273 }
5274 }
5275
unpark()5276 void Parker::unpark() {
5277 int status = os::Solaris::mutex_lock(_mutex);
5278 assert(status == 0, "invariant");
5279 const int s = _counter;
5280 _counter = 1;
5281 status = os::Solaris::mutex_unlock(_mutex);
5282 assert(status == 0, "invariant");
5283
5284 if (s < 1) {
5285 status = os::Solaris::cond_signal(_cond);
5286 assert(status == 0, "invariant");
5287 }
5288 }
5289
5290 extern char** environ;
5291
5292 // Run the specified command in a separate process. Return its exit value,
5293 // or -1 on failure (e.g. can't fork a new process).
5294 // Unlike system(), this function can be called from signal handler. It
5295 // doesn't block SIGINT et al.
fork_and_exec(char * cmd,bool use_vfork_if_available)5296 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
5297 char * argv[4];
5298 argv[0] = (char *)"sh";
5299 argv[1] = (char *)"-c";
5300 argv[2] = cmd;
5301 argv[3] = NULL;
5302
5303 // fork is async-safe, fork1 is not so can't use in signal handler
5304 pid_t pid;
5305 Thread* t = Thread::current_or_null_safe();
5306 if (t != NULL && t->is_inside_signal_handler()) {
5307 pid = fork();
5308 } else {
5309 pid = fork1();
5310 }
5311
5312 if (pid < 0) {
5313 // fork failed
5314 warning("fork failed: %s", os::strerror(errno));
5315 return -1;
5316
5317 } else if (pid == 0) {
5318 // child process
5319
5320 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
5321 execve("/usr/bin/sh", argv, environ);
5322
5323 // execve failed
5324 _exit(-1);
5325
5326 } else {
5327 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
5328 // care about the actual exit code, for now.
5329
5330 int status;
5331
5332 // Wait for the child process to exit. This returns immediately if
5333 // the child has already exited. */
5334 while (waitpid(pid, &status, 0) < 0) {
5335 switch (errno) {
5336 case ECHILD: return 0;
5337 case EINTR: break;
5338 default: return -1;
5339 }
5340 }
5341
5342 if (WIFEXITED(status)) {
5343 // The child exited normally; get its exit code.
5344 return WEXITSTATUS(status);
5345 } else if (WIFSIGNALED(status)) {
5346 // The child exited because of a signal
5347 // The best value to return is 0x80 + signal number,
5348 // because that is what all Unix shells do, and because
5349 // it allows callers to distinguish between process exit and
5350 // process death by signal.
5351 return 0x80 + WTERMSIG(status);
5352 } else {
5353 // Unknown exit code; pass it through
5354 return status;
5355 }
5356 }
5357 }
5358
write(int fd,const void * buf,unsigned int nBytes)5359 size_t os::write(int fd, const void *buf, unsigned int nBytes) {
5360 size_t res;
5361 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res);
5362 return res;
5363 }
5364
close(int fd)5365 int os::close(int fd) {
5366 return ::close(fd);
5367 }
5368
socket_close(int fd)5369 int os::socket_close(int fd) {
5370 return ::close(fd);
5371 }
5372
recv(int fd,char * buf,size_t nBytes,uint flags)5373 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5374 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5375 "Assumed _thread_in_native");
5376 RESTARTABLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags));
5377 }
5378
send(int fd,char * buf,size_t nBytes,uint flags)5379 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5380 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5381 "Assumed _thread_in_native");
5382 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5383 }
5384
raw_send(int fd,char * buf,size_t nBytes,uint flags)5385 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5386 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5387 }
5388
5389 // As both poll and select can be interrupted by signals, we have to be
5390 // prepared to restart the system call after updating the timeout, unless
5391 // a poll() is done with timeout == -1, in which case we repeat with this
5392 // "wait forever" value.
5393
connect(int fd,struct sockaddr * him,socklen_t len)5394 int os::connect(int fd, struct sockaddr *him, socklen_t len) {
5395 int _result;
5396 _result = ::connect(fd, him, len);
5397
5398 // On Solaris, when a connect() call is interrupted, the connection
5399 // can be established asynchronously (see 6343810). Subsequent calls
5400 // to connect() must check the errno value which has the semantic
5401 // described below (copied from the connect() man page). Handling
5402 // of asynchronously established connections is required for both
5403 // blocking and non-blocking sockets.
5404 // EINTR The connection attempt was interrupted
5405 // before any data arrived by the delivery of
5406 // a signal. The connection, however, will be
5407 // established asynchronously.
5408 //
5409 // EINPROGRESS The socket is non-blocking, and the connec-
5410 // tion cannot be completed immediately.
5411 //
5412 // EALREADY The socket is non-blocking, and a previous
5413 // connection attempt has not yet been com-
5414 // pleted.
5415 //
5416 // EISCONN The socket is already connected.
5417 if (_result == OS_ERR && errno == EINTR) {
5418 // restarting a connect() changes its errno semantics
5419 RESTARTABLE(::connect(fd, him, len), _result);
5420 // undo these changes
5421 if (_result == OS_ERR) {
5422 if (errno == EALREADY) {
5423 errno = EINPROGRESS; // fall through
5424 } else if (errno == EISCONN) {
5425 errno = 0;
5426 return OS_OK;
5427 }
5428 }
5429 }
5430 return _result;
5431 }
5432
5433 // Get the default path to the core file
5434 // Returns the length of the string
get_core_path(char * buffer,size_t bufferSize)5435 int os::get_core_path(char* buffer, size_t bufferSize) {
5436 const char* p = get_current_directory(buffer, bufferSize);
5437
5438 if (p == NULL) {
5439 assert(p != NULL, "failed to get current directory");
5440 return 0;
5441 }
5442
5443 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
5444 p, current_process_id());
5445
5446 return strlen(buffer);
5447 }
5448
5449 #ifndef PRODUCT
TestReserveMemorySpecial_test()5450 void TestReserveMemorySpecial_test() {
5451 // No tests available for this platform
5452 }
5453 #endif
5454
start_debugging(char * buf,int buflen)5455 bool os::start_debugging(char *buf, int buflen) {
5456 int len = (int)strlen(buf);
5457 char *p = &buf[len];
5458
5459 jio_snprintf(p, buflen-len,
5460 "\n\n"
5461 "Do you want to debug the problem?\n\n"
5462 "To debug, run 'dbx - %d'; then switch to thread " INTX_FORMAT "\n"
5463 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n"
5464 "Otherwise, press RETURN to abort...",
5465 os::current_process_id(), os::current_thread_id());
5466
5467 bool yes = os::message_box("Unexpected Error", buf);
5468
5469 if (yes) {
5470 // yes, user asked VM to launch debugger
5471 jio_snprintf(buf, sizeof(buf), "dbx - %d", os::current_process_id());
5472
5473 os::fork_and_exec(buf);
5474 yes = false;
5475 }
5476 return yes;
5477 }
5478