1 /*
2 * Copyright (c) 1999, 2019, 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_bsd.inline.hpp"
41 #include "os_share_bsd.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/semaphore.hpp"
57 #include "runtime/sharedRuntime.hpp"
58 #include "runtime/statSampler.hpp"
59 #include "runtime/stubRoutines.hpp"
60 #include "runtime/thread.inline.hpp"
61 #include "runtime/threadCritical.hpp"
62 #include "runtime/timer.hpp"
63 #include "services/attachListener.hpp"
64 #include "services/memTracker.hpp"
65 #include "services/runtimeService.hpp"
66 #include "utilities/align.hpp"
67 #include "utilities/decoder.hpp"
68 #include "utilities/defaultStream.hpp"
69 #include "utilities/events.hpp"
70 #include "utilities/growableArray.hpp"
71 #include "utilities/vmError.hpp"
72
73 // put OS-includes here
74 # include <sys/types.h>
75 # include <sys/mman.h>
76 # include <sys/stat.h>
77 # include <sys/select.h>
78 # include <pthread.h>
79 # include <signal.h>
80 # include <errno.h>
81 # include <dlfcn.h>
82 # include <stdio.h>
83 # include <unistd.h>
84 # include <sys/resource.h>
85 # include <sys/stat.h>
86 # include <sys/time.h>
87 # include <sys/times.h>
88 # include <sys/utsname.h>
89 # include <sys/socket.h>
90 # include <sys/wait.h>
91 # include <time.h>
92 # include <pwd.h>
93 # include <poll.h>
94 # include <fcntl.h>
95 # include <string.h>
96 # include <sys/param.h>
97 # include <sys/sysctl.h>
98 # include <sys/ipc.h>
99 # include <sys/shm.h>
100 #ifndef __APPLE__
101 # include <link.h>
102 # include <elf.h>
103 # include <stdlib.h>
104 #endif
105 # include <stdint.h>
106 # include <inttypes.h>
107 # include <sys/ioctl.h>
108 # include <sys/syscall.h>
109
110 #ifdef __FreeBSD__
111 # include <pthread_np.h>
112 # include <sys/cpuset.h>
113 # include <vm/vm_param.h>
114 #endif
115
116 #ifdef __NetBSD__
117 #include <lwp.h>
118 #endif
119
120 #if defined(__OpenBSD__) || defined(__DragonFly__)
121 # include <pthread_np.h>
122 #endif
123
124 #ifdef __APPLE__
125 #include <mach/mach.h> // semaphore_* API
126 #include <mach-o/dyld.h>
127 #include <sys/proc_info.h>
128 #include <objc/objc-auto.h>
129 // needed by current_stack_region() workaround for Mavericks
130 # define DEFAULT_MAIN_THREAD_STACK_PAGES 2048
131 # define OS_X_10_9_0_KERNEL_MAJOR_VERSION 13
132 #endif
133
134 #ifndef MAP_ANONYMOUS
135 #define MAP_ANONYMOUS MAP_ANON
136 #endif
137
138 #ifndef MAP_NORESERVE
139 #define MAP_NORESERVE 0
140 #endif
141
142 #define MAX_PATH (2 * K)
143
144 // for timer info max values which include all bits
145 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
146
147 #define LARGEPAGES_BIT (1 << 6)
148
149 ////////////////////////////////////////////////////////////////////////////////
150 // global variables
151 julong os::Bsd::_physical_memory = 0;
152
153 #ifdef __APPLE__
154 mach_timebase_info_data_t os::Bsd::_timebase_info = {0, 0};
155 volatile uint64_t os::Bsd::_max_abstime = 0;
156 #else
157 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL;
158 int (*os::Bsd::_getcpuclockid)(pthread_t, clockid_t *) = NULL;
159 #endif
160 pthread_t os::Bsd::_main_thread;
161 int os::Bsd::_page_size = -1;
162
163 static jlong initial_time_count=0;
164
165 static int clock_tics_per_sec = 100;
166
167 // For diagnostics to print a message once. see run_periodic_checks
168 static sigset_t check_signal_done;
169 static bool check_signals = true;
170
171 static pid_t _initial_pid = 0;
172
173 // Signal number used to suspend/resume a thread
174
175 // do not use any signal number less than SIGSEGV, see 4355769
176 static int SR_signum = SIGUSR2;
177 sigset_t SR_sigset;
178
179
180 ////////////////////////////////////////////////////////////////////////////////
181 // utility functions
182
183 static int SR_initialize();
184
available_memory()185 julong os::available_memory() {
186 return Bsd::available_memory();
187 }
188
189 // available here means free
available_memory()190 julong os::Bsd::available_memory() {
191 uint64_t available = physical_memory() >> 2;
192 #ifdef __APPLE__
193 mach_msg_type_number_t count = HOST_VM_INFO64_COUNT;
194 vm_statistics64_data_t vmstat;
195 kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64,
196 (host_info64_t)&vmstat, &count);
197 assert(kerr == KERN_SUCCESS,
198 "host_statistics64 failed - check mach_host_self() and count");
199 if (kerr == KERN_SUCCESS) {
200 available = vmstat.free_count * os::vm_page_size();
201 }
202 #elif defined(__FreeBSD__) || defined(__DragonFly__)
203 static const char *vm_stats[] = {
204 "vm.stats.vm.v_free_count",
205 "vm.stats.vm.v_cache_count",
206 "vm.stats.vm.v_inactive_count"
207 };
208 size_t size;
209 julong free_pages;
210 #ifdef __DragonFly__
211 u_long i, npages;
212 #else
213 u_int i, npages;
214 #endif
215
216 for (i = 0, free_pages = 0; i < sizeof(vm_stats) / sizeof(vm_stats[0]); i++) {
217 size = sizeof(npages);
218 if (sysctlbyname(vm_stats[i], &npages, &size, NULL, 0) == -1) {
219 free_pages = 0;
220 break;
221 }
222 free_pages += npages;
223 }
224 if (free_pages > 0)
225 available = free_pages * os::vm_page_size();
226 #endif
227 return available;
228 }
229
230 // for more info see :
231 // https://man.openbsd.org/sysctl.2
print_uptime_info(outputStream * st)232 void os::Bsd::print_uptime_info(outputStream* st) {
233 struct timeval boottime;
234 size_t len = sizeof(boottime);
235 int mib[2];
236 mib[0] = CTL_KERN;
237 mib[1] = KERN_BOOTTIME;
238
239 if (sysctl(mib, 2, &boottime, &len, NULL, 0) >= 0) {
240 time_t bootsec = boottime.tv_sec;
241 time_t currsec = time(NULL);
242 os::print_dhm(st, "OS uptime:", (long) difftime(currsec, bootsec));
243 }
244 }
245
physical_memory()246 julong os::physical_memory() {
247 return Bsd::physical_memory();
248 }
249
250 // Return true if user is running as root.
251
have_special_privileges()252 bool os::have_special_privileges() {
253 static bool init = false;
254 static bool privileges = false;
255 if (!init) {
256 #ifdef __APPLE__
257 privileges = (getuid() != geteuid()) || (getgid() != getegid());
258 #else
259 privileges = issetugid();
260 #endif
261 init = true;
262 }
263 return privileges;
264 }
265
266
267
268 // Cpu architecture string
269 #if defined(ZERO)
270 static char cpu_arch[] = ZERO_LIBARCH;
271 #elif defined(IA64)
272 static char cpu_arch[] = "ia64";
273 #elif defined(IA32)
274 static char cpu_arch[] = "i386";
275 #elif defined(AMD64)
276 static char cpu_arch[] = "amd64";
277 #elif defined(ARM)
278 static char cpu_arch[] = "arm";
279 #elif defined(PPC32)
280 static char cpu_arch[] = "ppc";
281 #elif defined(PPC64)
282 static char cpu_arch[] = "ppc64";
283 #elif defined(SPARC)
284 #ifdef _LP64
285 static char cpu_arch[] = "sparcv9";
286 #else
287 static char cpu_arch[] = "sparc";
288 #endif
289 #elif defined(AARCH64)
290 static char cpu_arch[] = "aarch64";
291 #else
292 #error Add appropriate cpu_arch setting
293 #endif
294
295 // Compiler variant
296 #ifdef COMPILER2
297 #define COMPILER_VARIANT "server"
298 #else
299 #define COMPILER_VARIANT "client"
300 #endif
301
302
initialize_system_info()303 void os::Bsd::initialize_system_info() {
304 int mib[2];
305 size_t len;
306 int cpu_val;
307 #if defined (HW_MEMSIZE) // Apple
308 uint64_t mem_val;
309 #define MEMMIB HW_MEMSIZE;
310 #elif defined(HW_PHYSMEM64) // OpenBSD & NetBSD
311 int64_t mem_val;
312 #define MEMMIB HW_PHYSMEM64;
313 #elif defined(HW_PHYSMEM) // FreeBSD
314 unsigned long mem_val;
315 #define MEMMIB HW_PHYSMEM;
316 #else
317 #error No ways to get physmem
318 #endif
319
320 // get processors count via hw.ncpus sysctl
321 mib[0] = CTL_HW;
322 mib[1] = HW_NCPU;
323 len = sizeof(cpu_val);
324 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) {
325 assert(len == sizeof(cpu_val), "unexpected data size");
326 set_processor_count(cpu_val);
327 } else {
328 set_processor_count(1); // fallback
329 }
330
331 // get physical memory via sysctl
332 mib[0] = CTL_HW;
333 mib[1] = MEMMIB;
334
335 len = sizeof(mem_val);
336 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) {
337 assert(len == sizeof(mem_val), "unexpected data size");
338 _physical_memory = mem_val;
339 } else {
340 _physical_memory = 256 * 1024 * 1024; // fallback (XXXBSD?)
341 }
342
343 #ifdef __OpenBSD__
344 {
345 // limit _physical_memory memory view on OpenBSD since
346 // datasize rlimit restricts us anyway.
347 struct rlimit limits;
348 getrlimit(RLIMIT_DATA, &limits);
349 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur);
350 }
351 #endif
352 }
353
354 #ifdef __APPLE__
get_home()355 static const char *get_home() {
356 const char *home_dir = ::getenv("HOME");
357 if ((home_dir == NULL) || (*home_dir == '\0')) {
358 struct passwd *passwd_info = getpwuid(geteuid());
359 if (passwd_info != NULL) {
360 home_dir = passwd_info->pw_dir;
361 }
362 }
363
364 return home_dir;
365 }
366 #endif
367
init_system_properties_values()368 void os::init_system_properties_values() {
369 // The next steps are taken in the product version:
370 //
371 // Obtain the JAVA_HOME value from the location of libjvm.so.
372 // This library should be located at:
373 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
374 //
375 // If "/jre/lib/" appears at the right place in the path, then we
376 // assume libjvm.so is installed in a JDK and we use this path.
377 //
378 // Otherwise exit with message: "Could not create the Java virtual machine."
379 //
380 // The following extra steps are taken in the debugging version:
381 //
382 // If "/jre/lib/" does NOT appear at the right place in the path
383 // instead of exit check for $JAVA_HOME environment variable.
384 //
385 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
386 // then we append a fake suffix "hotspot/libjvm.so" to this path so
387 // it looks like libjvm.so is installed there
388 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
389 //
390 // Otherwise exit.
391 //
392 // Important note: if the location of libjvm.so changes this
393 // code needs to be changed accordingly.
394
395 // See ld(1):
396 // The linker uses the following search paths to locate required
397 // shared libraries:
398 // 1: ...
399 // ...
400 // 7: The default directories, normally /lib and /usr/lib.
401 #ifndef DEFAULT_LIBPATH
402 #ifdef __APPLE__
403 #define DEFAULT_LIBPATH "/lib:/usr/lib"
404 #elif defined(__NetBSD__)
405 #define DEFAULT_LIBPATH "/usr/lib:/usr/pkg/lib"
406 #else
407 #define DEFAULT_LIBPATH "/usr/lib:/usr/local/lib"
408 #endif
409 #endif
410
411 // Base path of extensions installed on the system.
412 #define SYS_EXT_DIR "/usr/java/packages"
413 #define EXTENSIONS_DIR "/lib/ext"
414
415 #ifndef __APPLE__
416
417 // Buffer that fits several sprintfs.
418 // Note that the space for the colon and the trailing null are provided
419 // by the nulls included by the sizeof operator.
420 const size_t bufsize =
421 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
422 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir
423 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
424
425 // sysclasspath, java_home, dll_dir
426 {
427 char *pslash;
428 os::jvm_path(buf, bufsize);
429
430 // Found the full path to libjvm.so.
431 // Now cut the path to <java_home>/jre if we can.
432 pslash = strrchr(buf, '/');
433 if (pslash != NULL) {
434 *pslash = '\0'; // Get rid of /libjvm.so.
435 }
436 pslash = strrchr(buf, '/');
437 if (pslash != NULL) {
438 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
439 }
440 Arguments::set_dll_dir(buf);
441
442 if (pslash != NULL) {
443 pslash = strrchr(buf, '/');
444 if (pslash != NULL) {
445 *pslash = '\0'; // Get rid of /lib.
446 }
447 }
448 Arguments::set_java_home(buf);
449 set_boot_path('/', ':');
450 }
451
452 // Where to look for native libraries.
453 //
454 // Note: Due to a legacy implementation, most of the library path
455 // is set in the launcher. This was to accomodate linking restrictions
456 // on legacy Bsd implementations (which are no longer supported).
457 // Eventually, all the library path setting will be done here.
458 //
459 // However, to prevent the proliferation of improperly built native
460 // libraries, the new path component /usr/java/packages is added here.
461 // Eventually, all the library path setting will be done here.
462 {
463 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
464 // should always exist (until the legacy problem cited above is
465 // addressed).
466 const char *v = ::getenv("LD_LIBRARY_PATH");
467 const char *v_colon = ":";
468 if (v == NULL) { v = ""; v_colon = ""; }
469 // That's +1 for the colon and +1 for the trailing '\0'.
470 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char,
471 strlen(v) + 1 +
472 sizeof(DEFAULT_LIBPATH) + 1,
473 mtInternal);
474 sprintf(ld_library_path, "%s%s" DEFAULT_LIBPATH, v, v_colon);
475
476 Arguments::set_library_path(ld_library_path);
477 FREE_C_HEAP_ARRAY(char, ld_library_path);
478 }
479
480 // Extensions directories.
481 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
482 Arguments::set_ext_dirs(buf);
483
484 FREE_C_HEAP_ARRAY(char, buf);
485
486 #else // __APPLE__
487
488 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions"
489 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java"
490
491 const char *user_home_dir = get_home();
492 // The null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir.
493 size_t system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) +
494 sizeof(SYS_EXTENSIONS_DIRS);
495
496 // Buffer that fits several sprintfs.
497 // Note that the space for the colon and the trailing null are provided
498 // by the nulls included by the sizeof operator.
499 const size_t bufsize =
500 MAX2((size_t)MAXPATHLEN, // for dll_dir & friends.
501 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + system_ext_size); // extensions dir
502 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
503
504 // sysclasspath, java_home, dll_dir
505 {
506 char *pslash;
507 os::jvm_path(buf, bufsize);
508
509 // Found the full path to libjvm.so.
510 // Now cut the path to <java_home>/jre if we can.
511 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
512 pslash = strrchr(buf, '/');
513 if (pslash != NULL) {
514 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
515 }
516 #ifdef STATIC_BUILD
517 strcat(buf, "/lib");
518 #endif
519
520 Arguments::set_dll_dir(buf);
521
522 if (pslash != NULL) {
523 pslash = strrchr(buf, '/');
524 if (pslash != NULL) {
525 *pslash = '\0'; // Get rid of /lib.
526 }
527 }
528 Arguments::set_java_home(buf);
529 set_boot_path('/', ':');
530 }
531
532 // Where to look for native libraries.
533 //
534 // Note: Due to a legacy implementation, most of the library path
535 // is set in the launcher. This was to accomodate linking restrictions
536 // on legacy Bsd implementations (which are no longer supported).
537 // Eventually, all the library path setting will be done here.
538 //
539 // However, to prevent the proliferation of improperly built native
540 // libraries, the new path component /usr/java/packages is added here.
541 // Eventually, all the library path setting will be done here.
542 {
543 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
544 // should always exist (until the legacy problem cited above is
545 // addressed).
546 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code
547 // can specify a directory inside an app wrapper
548 const char *l = ::getenv("JAVA_LIBRARY_PATH");
549 const char *l_colon = ":";
550 if (l == NULL) { l = ""; l_colon = ""; }
551
552 const char *v = ::getenv("DYLD_LIBRARY_PATH");
553 const char *v_colon = ":";
554 if (v == NULL) { v = ""; v_colon = ""; }
555
556 // Apple's Java6 has "." at the beginning of java.library.path.
557 // OpenJDK on Windows has "." at the end of java.library.path.
558 // OpenJDK on Linux and Solaris don't have "." in java.library.path
559 // at all. To ease the transition from Apple's Java6 to OpenJDK7,
560 // "." is appended to the end of java.library.path. Yes, this
561 // could cause a change in behavior, but Apple's Java6 behavior
562 // can be achieved by putting "." at the beginning of the
563 // JAVA_LIBRARY_PATH environment variable.
564 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char,
565 strlen(v) + 1 + strlen(l) + 1 +
566 system_ext_size + 3,
567 mtInternal);
568 sprintf(ld_library_path, "%s%s%s%s%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS ":.",
569 v, v_colon, l, l_colon, user_home_dir);
570 Arguments::set_library_path(ld_library_path);
571 FREE_C_HEAP_ARRAY(char, ld_library_path);
572 }
573
574 // Extensions directories.
575 //
576 // Note that the space for the colon and the trailing null are provided
577 // by the nulls included by the sizeof operator (so actually one byte more
578 // than necessary is allocated).
579 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS,
580 user_home_dir, Arguments::get_java_home());
581 Arguments::set_ext_dirs(buf);
582
583 FREE_C_HEAP_ARRAY(char, buf);
584
585 #undef SYS_EXTENSIONS_DIR
586 #undef SYS_EXTENSIONS_DIRS
587
588 #endif // __APPLE__
589
590 #undef SYS_EXT_DIR
591 #undef EXTENSIONS_DIR
592 }
593
594 ////////////////////////////////////////////////////////////////////////////////
595 // breakpoint support
596
breakpoint()597 void os::breakpoint() {
598 BREAKPOINT;
599 }
600
breakpoint()601 extern "C" void breakpoint() {
602 // use debugger to set breakpoint here
603 }
604
605 ////////////////////////////////////////////////////////////////////////////////
606 // signal support
607
608 debug_only(static bool signal_sets_initialized = false);
609 static sigset_t unblocked_sigs, vm_sigs;
610
signal_sets_init()611 void os::Bsd::signal_sets_init() {
612 // Should also have an assertion stating we are still single-threaded.
613 assert(!signal_sets_initialized, "Already initialized");
614 // Fill in signals that are necessarily unblocked for all threads in
615 // the VM. Currently, we unblock the following signals:
616 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
617 // by -Xrs (=ReduceSignalUsage));
618 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
619 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
620 // the dispositions or masks wrt these signals.
621 // Programs embedding the VM that want to use the above signals for their
622 // own purposes must, at this time, use the "-Xrs" option to prevent
623 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
624 // (See bug 4345157, and other related bugs).
625 // In reality, though, unblocking these signals is really a nop, since
626 // these signals are not blocked by default.
627 sigemptyset(&unblocked_sigs);
628 sigaddset(&unblocked_sigs, SIGILL);
629 sigaddset(&unblocked_sigs, SIGSEGV);
630 sigaddset(&unblocked_sigs, SIGBUS);
631 sigaddset(&unblocked_sigs, SIGFPE);
632 #if defined(PPC64)
633 sigaddset(&unblocked_sigs, SIGTRAP);
634 #endif
635 sigaddset(&unblocked_sigs, SR_signum);
636
637 if (!ReduceSignalUsage) {
638 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
639 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
640
641 }
642 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
643 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
644 }
645 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
646 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
647 }
648 }
649 // Fill in signals that are blocked by all but the VM thread.
650 sigemptyset(&vm_sigs);
651 if (!ReduceSignalUsage) {
652 sigaddset(&vm_sigs, BREAK_SIGNAL);
653 }
654 debug_only(signal_sets_initialized = true);
655
656 }
657
658 // These are signals that are unblocked while a thread is running Java.
659 // (For some reason, they get blocked by default.)
unblocked_signals()660 sigset_t* os::Bsd::unblocked_signals() {
661 assert(signal_sets_initialized, "Not initialized");
662 return &unblocked_sigs;
663 }
664
665 // These are the signals that are blocked while a (non-VM) thread is
666 // running Java. Only the VM thread handles these signals.
vm_signals()667 sigset_t* os::Bsd::vm_signals() {
668 assert(signal_sets_initialized, "Not initialized");
669 return &vm_sigs;
670 }
671
hotspot_sigmask(Thread * thread)672 void os::Bsd::hotspot_sigmask(Thread* thread) {
673
674 //Save caller's signal mask before setting VM signal mask
675 sigset_t caller_sigmask;
676 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
677
678 OSThread* osthread = thread->osthread();
679 osthread->set_caller_sigmask(caller_sigmask);
680
681 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL);
682
683 if (!ReduceSignalUsage) {
684 if (thread->is_VM_thread()) {
685 // Only the VM thread handles BREAK_SIGNAL ...
686 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
687 } else {
688 // ... all other threads block BREAK_SIGNAL
689 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
690 }
691 }
692 }
693
694
695 //////////////////////////////////////////////////////////////////////////////
696 // create new thread
697
698 #ifdef __APPLE__
699 // library handle for calling objc_registerThreadWithCollector()
700 // without static linking to the libobjc library
701 #define OBJC_LIB "/usr/lib/libobjc.dylib"
702 #define OBJC_GCREGISTER "objc_registerThreadWithCollector"
703 typedef void (*objc_registerThreadWithCollector_t)();
704 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction;
705 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL;
706 #endif
707
708 #ifdef __APPLE__
locate_unique_thread_id(mach_port_t mach_thread_port)709 static uint64_t locate_unique_thread_id(mach_port_t mach_thread_port) {
710 // Additional thread_id used to correlate threads in SA
711 thread_identifier_info_data_t m_ident_info;
712 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT;
713
714 thread_info(mach_thread_port, THREAD_IDENTIFIER_INFO,
715 (thread_info_t) &m_ident_info, &count);
716
717 return m_ident_info.thread_id;
718 }
719 #endif
720
721 // Thread start routine for all newly created threads
thread_native_entry(Thread * thread)722 static void *thread_native_entry(Thread *thread) {
723
724 thread->record_stack_base_and_size();
725
726 // Try to randomize the cache line index of hot stack frames.
727 // This helps when threads of the same stack traces evict each other's
728 // cache lines. The threads can be either from the same JVM instance, or
729 // from different JVM instances. The benefit is especially true for
730 // processors with hyperthreading technology.
731 static int counter = 0;
732 int pid = os::current_process_id();
733 alloca(((pid ^ counter++) & 7) * 128);
734
735 thread->initialize_thread_current();
736
737 OSThread* osthread = thread->osthread();
738 Monitor* sync = osthread->startThread_lock();
739
740 osthread->set_thread_id(os::Bsd::gettid());
741
742 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
743 os::current_thread_id(), (uintx) pthread_self());
744
745 #ifdef __APPLE__
746 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id());
747 guarantee(unique_thread_id != 0, "unique thread id was not found");
748 osthread->set_unique_thread_id(unique_thread_id);
749 #endif
750 // initialize signal mask for this thread
751 os::Bsd::hotspot_sigmask(thread);
752
753 // initialize floating point control register
754 os::Bsd::init_thread_fpu_state();
755
756 #ifdef __APPLE__
757 // register thread with objc gc
758 if (objc_registerThreadWithCollectorFunction != NULL) {
759 objc_registerThreadWithCollectorFunction();
760 }
761 #endif
762
763 // handshaking with parent thread
764 {
765 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag);
766
767 // notify parent thread
768 osthread->set_state(INITIALIZED);
769 sync->notify_all();
770
771 // wait until os::start_thread()
772 while (osthread->get_state() == INITIALIZED) {
773 sync->wait(Mutex::_no_safepoint_check_flag);
774 }
775 }
776
777 // call one more level start routine
778 thread->call_run();
779
780 // Note: at this point the thread object may already have deleted itself.
781 // Prevent dereferencing it from here on out.
782 thread = NULL;
783
784 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
785 os::current_thread_id(), (uintx) pthread_self());
786
787 return 0;
788 }
789
create_thread(Thread * thread,ThreadType thr_type,size_t req_stack_size)790 bool os::create_thread(Thread* thread, ThreadType thr_type,
791 size_t req_stack_size) {
792 assert(thread->osthread() == NULL, "caller responsible");
793
794 // Allocate the OSThread object
795 OSThread* osthread = new OSThread(NULL, NULL);
796 if (osthread == NULL) {
797 return false;
798 }
799
800 // set the correct thread state
801 osthread->set_thread_type(thr_type);
802
803 // Initial state is ALLOCATED but not INITIALIZED
804 osthread->set_state(ALLOCATED);
805
806 thread->set_osthread(osthread);
807
808 // init thread attributes
809 pthread_attr_t attr;
810 pthread_attr_init(&attr);
811 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
812
813 // calculate stack size if it's not specified by caller
814 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
815 int status = pthread_attr_setstacksize(&attr, stack_size);
816 assert_status(status == 0, status, "pthread_attr_setstacksize");
817
818 ThreadState state;
819
820 {
821 pthread_t tid;
822 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread);
823
824 char buf[64];
825 if (ret == 0) {
826 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
827 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
828 } else {
829 log_warning(os, thread)("Failed to start thread - pthread_create failed (%s) for attributes: %s.",
830 os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
831 // Log some OS information which might explain why creating the thread failed.
832 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads());
833 LogStream st(Log(os, thread)::info());
834 os::Posix::print_rlimit_info(&st);
835 os::print_memory_info(&st);
836 }
837
838 pthread_attr_destroy(&attr);
839
840 if (ret != 0) {
841 // Need to clean up stuff we've allocated so far
842 thread->set_osthread(NULL);
843 delete osthread;
844 return false;
845 }
846
847 // Store pthread info into the OSThread
848 osthread->set_pthread_id(tid);
849
850 // Wait until child thread is either initialized or aborted
851 {
852 Monitor* sync_with_child = osthread->startThread_lock();
853 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag);
854 while ((state = osthread->get_state()) == ALLOCATED) {
855 sync_with_child->wait(Mutex::_no_safepoint_check_flag);
856 }
857 }
858
859 }
860
861 // Aborted due to thread limit being reached
862 if (state == ZOMBIE) {
863 thread->set_osthread(NULL);
864 delete osthread;
865 return false;
866 }
867
868 // The thread is returned suspended (in state INITIALIZED),
869 // and is started higher up in the call chain
870 assert(state == INITIALIZED, "race condition");
871 return true;
872 }
873
874 /////////////////////////////////////////////////////////////////////////////
875 // attach existing thread
876
877 // bootstrap the main thread
create_main_thread(JavaThread * thread)878 bool os::create_main_thread(JavaThread* thread) {
879 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread");
880 return create_attached_thread(thread);
881 }
882
create_attached_thread(JavaThread * thread)883 bool os::create_attached_thread(JavaThread* thread) {
884 #ifdef ASSERT
885 thread->verify_not_published();
886 #endif
887
888 // Allocate the OSThread object
889 OSThread* osthread = new OSThread(NULL, NULL);
890
891 if (osthread == NULL) {
892 return false;
893 }
894
895 osthread->set_thread_id(os::Bsd::gettid());
896
897 // Store pthread info into the OSThread
898 #ifdef __APPLE__
899 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id());
900 guarantee(unique_thread_id != 0, "just checking");
901 osthread->set_unique_thread_id(unique_thread_id);
902 #endif
903 osthread->set_pthread_id(::pthread_self());
904
905 // initialize floating point control register
906 os::Bsd::init_thread_fpu_state();
907
908 // Initial thread state is RUNNABLE
909 osthread->set_state(RUNNABLE);
910
911 thread->set_osthread(osthread);
912
913 // initialize signal mask for this thread
914 // and save the caller's signal mask
915 os::Bsd::hotspot_sigmask(thread);
916
917 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
918 os::current_thread_id(), (uintx) pthread_self());
919
920 return true;
921 }
922
pd_start_thread(Thread * thread)923 void os::pd_start_thread(Thread* thread) {
924 OSThread * osthread = thread->osthread();
925 assert(osthread->get_state() != INITIALIZED, "just checking");
926 Monitor* sync_with_child = osthread->startThread_lock();
927 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag);
928 sync_with_child->notify();
929 }
930
931 // Free Bsd resources related to the OSThread
free_thread(OSThread * osthread)932 void os::free_thread(OSThread* osthread) {
933 assert(osthread != NULL, "osthread not set");
934
935 // We are told to free resources of the argument thread,
936 // but we can only really operate on the current thread.
937 assert(Thread::current()->osthread() == osthread,
938 "os::free_thread but not current thread");
939
940 // Restore caller's signal mask
941 sigset_t sigmask = osthread->caller_sigmask();
942 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
943
944 delete osthread;
945 }
946
947 ////////////////////////////////////////////////////////////////////////////////
948 // time support
949
950 // Time since start-up in seconds to a fine granularity.
951 // Used by VMSelfDestructTimer and the MemProfiler.
elapsedTime()952 double os::elapsedTime() {
953
954 return ((double)os::elapsed_counter()) / os::elapsed_frequency();
955 }
956
elapsed_counter()957 jlong os::elapsed_counter() {
958 return javaTimeNanos() - initial_time_count;
959 }
960
elapsed_frequency()961 jlong os::elapsed_frequency() {
962 return NANOSECS_PER_SEC; // nanosecond resolution
963 }
964
supports_vtime()965 bool os::supports_vtime() { return true; }
enable_vtime()966 bool os::enable_vtime() { return false; }
vtime_enabled()967 bool os::vtime_enabled() { return false; }
968
elapsedVTime()969 double os::elapsedVTime() {
970 #ifdef RUSAGE_THREAD
971 struct rusage usage;
972 int retval = getrusage(RUSAGE_THREAD, &usage);
973 if (retval == 0) {
974 return (double) (usage.ru_utime.tv_sec + usage.ru_stime.tv_sec) + (double) (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000 * 1000);
975 }
976 #endif
977 // better than nothing, but not much
978 return elapsedTime();
979 }
980
javaTimeMillis()981 jlong os::javaTimeMillis() {
982 timeval time;
983 int status = gettimeofday(&time, NULL);
984 assert(status != -1, "bsd error");
985 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
986 }
987
javaTimeSystemUTC(jlong & seconds,jlong & nanos)988 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
989 timeval time;
990 int status = gettimeofday(&time, NULL);
991 assert(status != -1, "bsd error");
992 seconds = jlong(time.tv_sec);
993 nanos = jlong(time.tv_usec) * 1000;
994 }
995
996 #ifndef __APPLE__
997 #ifndef CLOCK_MONOTONIC
998 #define CLOCK_MONOTONIC (1)
999 #endif
1000 #endif
1001
1002 #ifdef __APPLE__
clock_init()1003 void os::Bsd::clock_init() {
1004 mach_timebase_info(&_timebase_info);
1005 }
1006 #else
clock_init()1007 void os::Bsd::clock_init() {
1008 struct timespec res;
1009 struct timespec tp;
1010 _getcpuclockid = (int (*)(pthread_t, clockid_t *))dlsym(RTLD_DEFAULT, "pthread_getcpuclockid");
1011 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 &&
1012 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) {
1013 // yes, monotonic clock is supported
1014 _clock_gettime = ::clock_gettime;
1015 return;
1016 }
1017 warning("No monotonic clock was available - timed services may " \
1018 "be adversely affected if the time-of-day clock changes");
1019 }
1020 #endif
1021
1022
1023
1024 #ifdef __APPLE__
1025
javaTimeNanos()1026 jlong os::javaTimeNanos() {
1027 const uint64_t tm = mach_absolute_time();
1028 const uint64_t now = (tm * Bsd::_timebase_info.numer) / Bsd::_timebase_info.denom;
1029 const uint64_t prev = Bsd::_max_abstime;
1030 if (now <= prev) {
1031 return prev; // same or retrograde time;
1032 }
1033 const uint64_t obsv = Atomic::cmpxchg(now, &Bsd::_max_abstime, prev);
1034 assert(obsv >= prev, "invariant"); // Monotonicity
1035 // If the CAS succeeded then we're done and return "now".
1036 // If the CAS failed and the observed value "obsv" is >= now then
1037 // we should return "obsv". If the CAS failed and now > obsv > prv then
1038 // some other thread raced this thread and installed a new value, in which case
1039 // we could either (a) retry the entire operation, (b) retry trying to install now
1040 // or (c) just return obsv. We use (c). No loop is required although in some cases
1041 // we might discard a higher "now" value in deference to a slightly lower but freshly
1042 // installed obsv value. That's entirely benign -- it admits no new orderings compared
1043 // to (a) or (b) -- and greatly reduces coherence traffic.
1044 // We might also condition (c) on the magnitude of the delta between obsv and now.
1045 // Avoiding excessive CAS operations to hot RW locations is critical.
1046 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
1047 return (prev == obsv) ? now : obsv;
1048 }
1049
1050 #else // __APPLE__
1051
javaTimeNanos()1052 jlong os::javaTimeNanos() {
1053 if (os::supports_monotonic_clock()) {
1054 struct timespec tp;
1055 int status = Bsd::_clock_gettime(CLOCK_MONOTONIC, &tp);
1056 assert(status == 0, "gettime error");
1057 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec);
1058 return result;
1059 } else {
1060 timeval time;
1061 int status = gettimeofday(&time, NULL);
1062 assert(status != -1, "bsd error");
1063 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec);
1064 return 1000 * usecs;
1065 }
1066 }
1067
1068 #endif // __APPLE__
1069
javaTimeNanos_info(jvmtiTimerInfo * info_ptr)1070 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1071 if (os::supports_monotonic_clock()) {
1072 info_ptr->max_value = ALL_64_BITS;
1073
1074 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past
1075 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1076 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1077 } else {
1078 // gettimeofday - based on time in seconds since the Epoch thus does not wrap
1079 info_ptr->max_value = ALL_64_BITS;
1080
1081 // gettimeofday is a real time clock so it skips
1082 info_ptr->may_skip_backward = true;
1083 info_ptr->may_skip_forward = true;
1084 }
1085
1086 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1087 }
1088
1089 // Return the real, user, and system times in seconds from an
1090 // arbitrary fixed point in the past.
getTimesSecs(double * process_real_time,double * process_user_time,double * process_system_time)1091 bool os::getTimesSecs(double* process_real_time,
1092 double* process_user_time,
1093 double* process_system_time) {
1094 struct tms ticks;
1095 clock_t real_ticks = times(&ticks);
1096
1097 if (real_ticks == (clock_t) (-1)) {
1098 return false;
1099 } else {
1100 double ticks_per_second = (double) clock_tics_per_sec;
1101 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1102 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1103 *process_real_time = ((double) real_ticks) / ticks_per_second;
1104
1105 return true;
1106 }
1107 }
1108
1109
local_time_string(char * buf,size_t buflen)1110 char * os::local_time_string(char *buf, size_t buflen) {
1111 struct tm t;
1112 time_t long_time;
1113 time(&long_time);
1114 localtime_r(&long_time, &t);
1115 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1116 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1117 t.tm_hour, t.tm_min, t.tm_sec);
1118 return buf;
1119 }
1120
localtime_pd(const time_t * clock,struct tm * res)1121 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1122 return localtime_r(clock, res);
1123 }
1124
1125 ////////////////////////////////////////////////////////////////////////////////
1126 // runtime exit support
1127
1128 // Note: os::shutdown() might be called very early during initialization, or
1129 // called from signal handler. Before adding something to os::shutdown(), make
1130 // sure it is async-safe and can handle partially initialized VM.
shutdown()1131 void os::shutdown() {
1132
1133 // allow PerfMemory to attempt cleanup of any persistent resources
1134 perfMemory_exit();
1135
1136 // needs to remove object in file system
1137 AttachListener::abort();
1138
1139 // flush buffered output, finish log files
1140 ostream_abort();
1141
1142 // Check for abort hook
1143 abort_hook_t abort_hook = Arguments::abort_hook();
1144 if (abort_hook != NULL) {
1145 abort_hook();
1146 }
1147
1148 }
1149
1150 // Note: os::abort() might be called very early during initialization, or
1151 // called from signal handler. Before adding something to os::abort(), make
1152 // sure it is async-safe and can handle partially initialized VM.
abort(bool dump_core,void * siginfo,const void * context)1153 void os::abort(bool dump_core, void* siginfo, const void* context) {
1154 os::shutdown();
1155 if (dump_core) {
1156 #ifndef PRODUCT
1157 fdStream out(defaultStream::output_fd());
1158 out.print_raw("Current thread is ");
1159 char buf[16];
1160 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1161 out.print_raw_cr(buf);
1162 out.print_raw_cr("Dumping core ...");
1163 #endif
1164 ::abort(); // dump core
1165 }
1166
1167 ::exit(1);
1168 }
1169
1170 // Die immediately, no exit hook, no abort hook, no cleanup.
1171 // Dump a core file, if possible, for debugging.
die()1172 void os::die() {
1173 if (TestUnresponsiveErrorHandler && !CreateCoredumpOnCrash) {
1174 // For TimeoutInErrorHandlingTest.java, we just kill the VM
1175 // and don't take the time to generate a core file.
1176 os::signal_raise(SIGKILL);
1177 } else {
1178 // _exit() on BsdThreads only kills current thread
1179 ::abort();
1180 }
1181 }
1182
1183 // This method is a copy of JDK's sysGetLastErrorString
1184 // from src/solaris/hpi/src/system_md.c
1185
lasterror(char * buf,size_t len)1186 size_t os::lasterror(char *buf, size_t len) {
1187 if (errno == 0) return 0;
1188
1189 const char *s = os::strerror(errno);
1190 size_t n = ::strlen(s);
1191 if (n >= len) {
1192 n = len - 1;
1193 }
1194 ::strncpy(buf, s, n);
1195 buf[n] = '\0';
1196 return n;
1197 }
1198
1199 // Information of current thread in variety of formats
gettid()1200 pid_t os::Bsd::gettid() {
1201 int retval = -1;
1202
1203 #ifdef __APPLE__ //XNU kernel
1204 // despite the fact mach port is actually not a thread id use it
1205 // instead of syscall(SYS_thread_selfid) as it certainly fits to u4
1206 retval = ::pthread_mach_thread_np(::pthread_self());
1207 guarantee(retval != 0, "just checking");
1208 return retval;
1209
1210 #elif defined(__FreeBSD__) || defined(__DragonFly__)
1211 return ::pthread_getthreadid_np();
1212 #elif defined(__OpenBSD__)
1213 retval = getthrid();
1214 #elif defined(__NetBSD__)
1215 retval = (pid_t) _lwp_self();
1216 #endif
1217
1218 if (retval == -1) {
1219 return getpid();
1220 }
1221 return retval;
1222 }
1223
current_thread_id()1224 intx os::current_thread_id() {
1225 #ifdef __APPLE__
1226 return (intx)::pthread_mach_thread_np(::pthread_self());
1227 #elif defined(__FreeBSD__)
1228 return os::Bsd::gettid();
1229 #else
1230 return (intx)::pthread_self();
1231 #endif
1232 }
1233
current_process_id()1234 int os::current_process_id() {
1235
1236 // Under the old bsd thread library, bsd gives each thread
1237 // its own process id. Because of this each thread will return
1238 // a different pid if this method were to return the result
1239 // of getpid(2). Bsd provides no api that returns the pid
1240 // of the launcher thread for the vm. This implementation
1241 // returns a unique pid, the pid of the launcher thread
1242 // that starts the vm 'process'.
1243
1244 // Under the NPTL, getpid() returns the same pid as the
1245 // launcher thread rather than a unique pid per thread.
1246 // Use gettid() if you want the old pre NPTL behaviour.
1247
1248 // if you are looking for the result of a call to getpid() that
1249 // returns a unique pid for the calling thread, then look at the
1250 // OSThread::thread_id() method in osThread_bsd.hpp file
1251
1252 return (int)(_initial_pid ? _initial_pid : getpid());
1253 }
1254
1255 // DLL functions
1256
dll_file_extension()1257 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; }
1258
1259 // This must be hard coded because it's the system's temporary
1260 // directory not the java application's temp directory, ala java.io.tmpdir.
1261 #ifdef __APPLE__
1262 // macosx has a secure per-user temporary directory
1263 char temp_path_storage[PATH_MAX];
get_temp_directory()1264 const char* os::get_temp_directory() {
1265 static char *temp_path = NULL;
1266 if (temp_path == NULL) {
1267 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX);
1268 if (pathSize == 0 || pathSize > PATH_MAX) {
1269 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage));
1270 }
1271 temp_path = temp_path_storage;
1272 }
1273 return temp_path;
1274 }
1275 #else // __APPLE__
get_temp_directory()1276 const char* os::get_temp_directory() { return "/tmp"; }
1277 #endif // __APPLE__
1278
1279 // check if addr is inside libjvm.so
address_is_in_vm(address addr)1280 bool os::address_is_in_vm(address addr) {
1281 static address libjvm_base_addr;
1282 Dl_info dlinfo;
1283
1284 if (libjvm_base_addr == NULL) {
1285 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1286 libjvm_base_addr = (address)dlinfo.dli_fbase;
1287 }
1288 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1289 }
1290
1291 if (dladdr((void *)addr, &dlinfo) != 0) {
1292 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1293 }
1294
1295 return false;
1296 }
1297
1298
1299 #define MACH_MAXSYMLEN 256
1300
dll_address_to_function_name(address addr,char * buf,int buflen,int * offset,bool demangle)1301 bool os::dll_address_to_function_name(address addr, char *buf,
1302 int buflen, int *offset,
1303 bool demangle) {
1304 // buf is not optional, but offset is optional
1305 assert(buf != NULL, "sanity check");
1306
1307 Dl_info dlinfo;
1308 char localbuf[MACH_MAXSYMLEN];
1309
1310 if (dladdr((void*)addr, &dlinfo) != 0) {
1311 // see if we have a matching symbol
1312 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1313 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1314 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1315 }
1316 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1317 return true;
1318 }
1319 // no matching symbol so try for just file info
1320 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1321 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1322 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1323 return true;
1324 }
1325 }
1326
1327 // Handle non-dynamic manually:
1328 if (dlinfo.dli_fbase != NULL &&
1329 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset,
1330 dlinfo.dli_fbase)) {
1331 if (!(demangle && Decoder::demangle(localbuf, buf, buflen))) {
1332 jio_snprintf(buf, buflen, "%s", localbuf);
1333 }
1334 return true;
1335 }
1336 }
1337 buf[0] = '\0';
1338 if (offset != NULL) *offset = -1;
1339 return false;
1340 }
1341
1342 // ported from solaris version
dll_address_to_library_name(address addr,char * buf,int buflen,int * offset)1343 bool os::dll_address_to_library_name(address addr, char* buf,
1344 int buflen, int* offset) {
1345 // buf is not optional, but offset is optional
1346 assert(buf != NULL, "sanity check");
1347
1348 Dl_info dlinfo;
1349
1350 if (dladdr((void*)addr, &dlinfo) != 0) {
1351 if (dlinfo.dli_fname != NULL) {
1352 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1353 }
1354 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1355 *offset = addr - (address)dlinfo.dli_fbase;
1356 }
1357 return true;
1358 }
1359
1360 buf[0] = '\0';
1361 if (offset) *offset = -1;
1362 return false;
1363 }
1364
1365 // Loads .dll/.so and
1366 // in case of error it checks if .dll/.so was built for the
1367 // same architecture as Hotspot is running on
1368
1369 #ifdef __APPLE__
dll_load(const char * filename,char * ebuf,int ebuflen)1370 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1371 #ifdef STATIC_BUILD
1372 return os::get_default_process_handle();
1373 #else
1374 log_info(os)("attempting shared library load of %s", filename);
1375
1376 void * result= ::dlopen(filename, RTLD_LAZY);
1377 if (result != NULL) {
1378 Events::log(NULL, "Loaded shared library %s", filename);
1379 // Successful loading
1380 log_info(os)("shared library load of %s was successful", filename);
1381 return result;
1382 }
1383
1384 const char* error_report = ::dlerror();
1385 if (error_report == NULL) {
1386 error_report = "dlerror returned no error description";
1387 }
1388 if (ebuf != NULL && ebuflen > 0) {
1389 // Read system error message into ebuf
1390 ::strncpy(ebuf, error_report, ebuflen-1);
1391 ebuf[ebuflen-1]='\0';
1392 }
1393 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report);
1394 log_info(os)("shared library load of %s failed, %s", filename, error_report);
1395
1396 return NULL;
1397 #endif // STATIC_BUILD
1398 }
1399 #else
dll_load(const char * filename,char * ebuf,int ebuflen)1400 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1401 #ifdef STATIC_BUILD
1402 return os::get_default_process_handle();
1403 #else
1404 log_info(os)("attempting shared library load of %s", filename);
1405
1406 void * result= ::dlopen(filename, RTLD_LAZY);
1407 if (result != NULL) {
1408 Events::log(NULL, "Loaded shared library %s", filename);
1409 // Successful loading
1410 log_info(os)("shared library load of %s was successful", filename);
1411 return result;
1412 }
1413
1414 Elf32_Ehdr elf_head;
1415
1416 const char* error_report = ::dlerror();
1417 if (error_report == NULL) {
1418 error_report = "dlerror returned no error description";
1419 }
1420 if (ebuf != NULL && ebuflen > 0) {
1421 // Read system error message into ebuf
1422 ::strncpy(ebuf, error_report, ebuflen-1);
1423 ebuf[ebuflen-1]='\0';
1424 }
1425 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report);
1426 log_info(os)("shared library load of %s failed, %s", filename, error_report);
1427
1428 int diag_msg_max_length=ebuflen-strlen(ebuf);
1429 char* diag_msg_buf=ebuf+strlen(ebuf);
1430
1431 if (diag_msg_max_length==0) {
1432 // No more space in ebuf for additional diagnostics message
1433 return NULL;
1434 }
1435
1436
1437 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1438
1439 if (file_descriptor < 0) {
1440 // Can't open library, report dlerror() message
1441 return NULL;
1442 }
1443
1444 bool failed_to_read_elf_head=
1445 (sizeof(elf_head)!=
1446 (::read(file_descriptor, &elf_head,sizeof(elf_head))));
1447
1448 ::close(file_descriptor);
1449 if (failed_to_read_elf_head) {
1450 // file i/o error - report dlerror() msg
1451 return NULL;
1452 }
1453
1454 typedef struct {
1455 Elf32_Half code; // Actual value as defined in elf.h
1456 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1457 char elf_class; // 32 or 64 bit
1458 char endianess; // MSB or LSB
1459 char* name; // String representation
1460 } arch_t;
1461
1462 #ifndef EM_486
1463 #define EM_486 6 /* Intel 80486 */
1464 #endif
1465
1466 #ifndef EM_MIPS_RS3_LE
1467 #define EM_MIPS_RS3_LE 10 /* MIPS */
1468 #endif
1469
1470 #ifndef EM_PPC64
1471 #define EM_PPC64 21 /* PowerPC64 */
1472 #endif
1473
1474 #ifndef EM_S390
1475 #define EM_S390 22 /* IBM System/390 */
1476 #endif
1477
1478 #ifndef EM_IA_64
1479 #define EM_IA_64 50 /* HP/Intel IA-64 */
1480 #endif
1481
1482 #ifndef EM_X86_64
1483 #define EM_X86_64 62 /* AMD x86-64 */
1484 #endif
1485
1486 #ifndef EM_AARCH64
1487 #define EM_AARCH64 183 /* ARM AARCH64 */
1488 #endif
1489
1490 static const arch_t arch_array[]={
1491 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1492 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1493 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1494 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1495 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1496 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1497 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1498 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1499 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1500 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"},
1501 {EM_AARCH64, EM_AARCH64, ELFCLASS64, ELFDATA2LSB, (char*)"AARCH64"},
1502 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"},
1503 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"},
1504 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"},
1505 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"},
1506 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"},
1507 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"}
1508 };
1509
1510 #if (defined IA32)
1511 static Elf32_Half running_arch_code=EM_386;
1512 #elif (defined AMD64)
1513 static Elf32_Half running_arch_code=EM_X86_64;
1514 #elif (defined IA64)
1515 static Elf32_Half running_arch_code=EM_IA_64;
1516 #elif (defined __sparc) && (defined _LP64)
1517 static Elf32_Half running_arch_code=EM_SPARCV9;
1518 #elif (defined __sparc) && (!defined _LP64)
1519 static Elf32_Half running_arch_code=EM_SPARC;
1520 #elif (defined __powerpc64__)
1521 static Elf32_Half running_arch_code=EM_PPC64;
1522 #elif (defined __powerpc__)
1523 static Elf32_Half running_arch_code=EM_PPC;
1524 #elif (defined AARCH64)
1525 static Elf32_Half running_arch_code=EM_AARCH64;
1526 #elif (defined ARM)
1527 static Elf32_Half running_arch_code=EM_ARM;
1528 #elif (defined S390)
1529 static Elf32_Half running_arch_code=EM_S390;
1530 #elif (defined ALPHA)
1531 static Elf32_Half running_arch_code=EM_ALPHA;
1532 #elif (defined MIPSEL)
1533 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE;
1534 #elif (defined PARISC)
1535 static Elf32_Half running_arch_code=EM_PARISC;
1536 #elif (defined MIPS)
1537 static Elf32_Half running_arch_code=EM_MIPS;
1538 #elif (defined M68K)
1539 static Elf32_Half running_arch_code=EM_68K;
1540 #else
1541 #error Method os::dll_load requires that one of following is defined:\
1542 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, AARCH64, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K
1543 #endif
1544
1545 // Identify compatability class for VM's architecture and library's architecture
1546 // Obtain string descriptions for architectures
1547
1548 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1549 int running_arch_index=-1;
1550
1551 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) {
1552 if (running_arch_code == arch_array[i].code) {
1553 running_arch_index = i;
1554 }
1555 if (lib_arch.code == arch_array[i].code) {
1556 lib_arch.compat_class = arch_array[i].compat_class;
1557 lib_arch.name = arch_array[i].name;
1558 }
1559 }
1560
1561 assert(running_arch_index != -1,
1562 "Didn't find running architecture code (running_arch_code) in arch_array");
1563 if (running_arch_index == -1) {
1564 // Even though running architecture detection failed
1565 // we may still continue with reporting dlerror() message
1566 return NULL;
1567 }
1568
1569 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1570 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1571 return NULL;
1572 }
1573
1574 #ifndef S390
1575 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1576 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1577 return NULL;
1578 }
1579 #endif // !S390
1580
1581 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1582 if (lib_arch.name!=NULL) {
1583 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1584 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1585 lib_arch.name, arch_array[running_arch_index].name);
1586 } else {
1587 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1588 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1589 lib_arch.code,
1590 arch_array[running_arch_index].name);
1591 }
1592 }
1593
1594 return NULL;
1595 #endif // STATIC_BUILD
1596 }
1597 #endif // !__APPLE__
1598
get_default_process_handle()1599 void* os::get_default_process_handle() {
1600 #ifdef __APPLE__
1601 // MacOS X needs to use RTLD_FIRST instead of RTLD_LAZY
1602 // to avoid finding unexpected symbols on second (or later)
1603 // loads of a library.
1604 return (void*)::dlopen(NULL, RTLD_FIRST);
1605 #else
1606 return (void*)::dlopen(NULL, RTLD_LAZY);
1607 #endif
1608 }
1609
1610 // XXX: Do we need a lock around this as per Linux?
dll_lookup(void * handle,const char * name)1611 void* os::dll_lookup(void* handle, const char* name) {
1612 return dlsym(handle, name);
1613 }
1614
_print_dll_info_cb(const char * name,address base_address,address top_address,void * param)1615 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) {
1616 outputStream * out = (outputStream *) param;
1617 out->print_cr(INTPTR_FORMAT " \t%s", (intptr_t)base_address, name);
1618 return 0;
1619 }
1620
print_dll_info(outputStream * st)1621 void os::print_dll_info(outputStream *st) {
1622 st->print_cr("Dynamic libraries:");
1623 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) {
1624 st->print_cr("Error: Cannot print dynamic libraries.");
1625 }
1626 }
1627
1628 #if defined(__OpenBSD__)
1629 struct iterate_data {
1630 os::LoadedModulesCallbackFunc callback;
1631 void *param;
1632 };
1633
iter_callback(struct dl_phdr_info * info,size_t size,void * d)1634 static int iter_callback(struct dl_phdr_info *info, size_t size, void* d) {
1635 struct iterate_data *data = (struct iterate_data *)d;
1636
1637 if(data->callback(info->dlpi_name, (address)info->dlpi_addr, (address)0, data->param))
1638 return 1;
1639
1640 return 0;
1641 }
1642 #endif
1643
get_loaded_modules_info(os::LoadedModulesCallbackFunc callback,void * param)1644 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1645 #ifdef RTLD_DI_LINKMAP
1646 Dl_info dli;
1647 void *handle;
1648 Link_map *map;
1649 Link_map *p;
1650
1651 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 ||
1652 dli.dli_fname == NULL) {
1653 return 1;
1654 }
1655 handle = dlopen(dli.dli_fname, RTLD_LAZY);
1656 if (handle == NULL) {
1657 return 1;
1658 }
1659 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1660 if (map == NULL) {
1661 dlclose(handle);
1662 return 1;
1663 }
1664
1665 while (map->l_prev != NULL)
1666 map = map->l_prev;
1667
1668 while (map != NULL) {
1669 // Value for top_address is returned as 0 since we don't have any information about module size
1670 if (callback(map->l_name, (address)map->l_addr, (address)0, param)) {
1671 dlclose(handle);
1672 return 1;
1673 }
1674 map = map->l_next;
1675 }
1676
1677 dlclose(handle);
1678 return 0;
1679 #elif defined(__APPLE__)
1680 for (uint32_t i = 1; i < _dyld_image_count(); i++) {
1681 // Value for top_address is returned as 0 since we don't have any information about module size
1682 if (callback(_dyld_get_image_name(i), (address)_dyld_get_image_header(i), (address)0, param)) {
1683 return 1;
1684 }
1685 }
1686 return 0;
1687 #elif defined(__OpenBSD__)
1688 struct iterate_data data = { callback, param };
1689
1690 return dl_iterate_phdr(iter_callback, &data);
1691 #else
1692 return 1;
1693 #endif
1694 }
1695
get_summary_os_info(char * buf,size_t buflen)1696 void os::get_summary_os_info(char* buf, size_t buflen) {
1697 // These buffers are small because we want this to be brief
1698 // and not use a lot of stack while generating the hs_err file.
1699 char os[100];
1700 size_t size = sizeof(os);
1701 int mib_kern[] = { CTL_KERN, KERN_OSTYPE };
1702 if (sysctl(mib_kern, 2, os, &size, NULL, 0) < 0) {
1703 #ifdef __APPLE__
1704 strncpy(os, "Darwin", sizeof(os));
1705 #elif defined(__OpenBSD__)
1706 strncpy(os, "OpenBSD", sizeof(os));
1707 #else
1708 strncpy(os, "BSD", sizeof(os));
1709 #endif
1710 }
1711
1712 char release[100];
1713 size = sizeof(release);
1714 int mib_release[] = { CTL_KERN, KERN_OSRELEASE };
1715 if (sysctl(mib_release, 2, release, &size, NULL, 0) < 0) {
1716 // if error, leave blank
1717 strncpy(release, "", sizeof(release));
1718 }
1719 snprintf(buf, buflen, "%s %s", os, release);
1720 }
1721
print_os_info_brief(outputStream * st)1722 void os::print_os_info_brief(outputStream* st) {
1723 os::Posix::print_uname_info(st);
1724 }
1725
print_os_info(outputStream * st)1726 void os::print_os_info(outputStream* st) {
1727 st->print("OS:");
1728
1729 os::Posix::print_uname_info(st);
1730
1731 os::Bsd::print_uptime_info(st);
1732
1733 os::Posix::print_rlimit_info(st);
1734
1735 os::Posix::print_load_average(st);
1736
1737 VM_Version::print_platform_virtualization_info(st);
1738 }
1739
pd_print_cpu_info(outputStream * st,char * buf,size_t buflen)1740 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1741 size_t size = buflen;
1742 int mib[] = { CTL_HW, HW_MODEL };
1743 if (sysctl(mib, 2, buf, &size, NULL, 0) == 0) {
1744 st->print("CPU Model: %s\n", buf);
1745 }
1746 }
1747
get_summary_cpu_info(char * buf,size_t buflen)1748 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1749 size_t size;
1750 #ifdef __APPLE__
1751 unsigned int mhz;
1752 size = sizeof(mhz);
1753 int mib[] = { CTL_HW, HW_CPU_FREQ };
1754 if (sysctl(mib, 2, &mhz, &size, NULL, 0) < 0) {
1755 mhz = 1; // looks like an error but can be divided by
1756 } else {
1757 mhz /= 1000000; // reported in millions
1758 }
1759 #endif
1760
1761 char model[100];
1762 size = sizeof(model);
1763 int mib_model[] = { CTL_HW, HW_MODEL };
1764 if (sysctl(mib_model, 2, model, &size, NULL, 0) < 0) {
1765 strncpy(model, cpu_arch, sizeof(model));
1766 }
1767
1768 char machine[100];
1769 size = sizeof(machine);
1770 int mib_machine[] = { CTL_HW, HW_MACHINE };
1771 if (sysctl(mib_machine, 2, machine, &size, NULL, 0) < 0) {
1772 strncpy(machine, "", sizeof(machine));
1773 }
1774
1775 #ifdef __APPLE__
1776 snprintf(buf, buflen, "%s %s %d MHz", model, machine, mhz);
1777 #else
1778 snprintf(buf, buflen, "%s %s", model, machine);
1779 #endif
1780 }
1781
1782 #ifdef __FreeBSD__
get_swap_info(int * total_pages,int * used_pages)1783 static void get_swap_info(int *total_pages, int *used_pages) {
1784 struct xswdev xsw;
1785 size_t mibsize, size;
1786 int mib[16];
1787 int n, total = 0, used = 0;
1788
1789 mibsize = sizeof(mib) / sizeof(mib[0]);
1790 if (sysctlnametomib("vm.swap_info", mib, &mibsize) != -1) {
1791 for (n = 0; ; n++) {
1792 mib[mibsize] = n;
1793 size = sizeof(xsw);
1794 if (sysctl(mib, mibsize + 1, &xsw, &size, NULL, 0) == -1)
1795 break;
1796 total += xsw.xsw_nblks;
1797 used += xsw.xsw_used;
1798 }
1799 }
1800 *total_pages = total;
1801 *used_pages = used;
1802 }
1803 #endif
1804
print_memory_info(outputStream * st)1805 void os::print_memory_info(outputStream* st) {
1806 st->print("Memory:");
1807 st->print(" %dk page", os::vm_page_size()>>10);
1808
1809 st->print(", physical " UINT64_FORMAT "k",
1810 os::physical_memory() >> 10);
1811 st->print("(" UINT64_FORMAT "k free)",
1812 os::available_memory() >> 10);
1813 #ifdef __FreeBSD__
1814 int total, used;
1815 get_swap_info(&total, &used);
1816 st->print(", swap " UINT64_FORMAT "k",
1817 (((uint64_t) total) * ((uint64_t) os::vm_page_size())) >> 10);
1818 st->print("(" UINT64_FORMAT "k free)",
1819 (((uint64_t) (total - used)) * ((uint64_t) os::vm_page_size())) >> 10);
1820 #elif defined(__APPLE__)
1821 xsw_usage swap_usage;
1822 size_t size = sizeof(swap_usage);
1823
1824 if((sysctlbyname("vm.swapusage", &swap_usage, &size, NULL, 0) == 0) || (errno == ENOMEM)) {
1825 if (size >= offset_of(xsw_usage, xsu_used)) {
1826 st->print(", swap " UINT64_FORMAT "k",
1827 ((julong) swap_usage.xsu_total) >> 10);
1828 st->print("(" UINT64_FORMAT "k free)",
1829 ((julong) swap_usage.xsu_avail) >> 10);
1830 }
1831 }
1832 #endif
1833
1834 st->cr();
1835 }
1836
1837 static void print_signal_handler(outputStream* st, int sig,
1838 char* buf, size_t buflen);
1839
print_signal_handlers(outputStream * st,char * buf,size_t buflen)1840 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1841 st->print_cr("Signal Handlers:");
1842 print_signal_handler(st, SIGSEGV, buf, buflen);
1843 print_signal_handler(st, SIGBUS , buf, buflen);
1844 print_signal_handler(st, SIGFPE , buf, buflen);
1845 print_signal_handler(st, SIGPIPE, buf, buflen);
1846 print_signal_handler(st, SIGXFSZ, buf, buflen);
1847 print_signal_handler(st, SIGILL , buf, buflen);
1848 print_signal_handler(st, SR_signum, buf, buflen);
1849 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1850 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1851 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1852 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1853 }
1854
1855 static char saved_jvm_path[MAXPATHLEN] = {0};
1856
1857 // Find the full path to the current module, libjvm
jvm_path(char * buf,jint buflen)1858 void os::jvm_path(char *buf, jint buflen) {
1859 // Error checking.
1860 if (buflen < MAXPATHLEN) {
1861 assert(false, "must use a large-enough buffer");
1862 buf[0] = '\0';
1863 return;
1864 }
1865 // Lazy resolve the path to current module.
1866 if (saved_jvm_path[0] != 0) {
1867 strcpy(buf, saved_jvm_path);
1868 return;
1869 }
1870
1871 char dli_fname[MAXPATHLEN];
1872 dli_fname[0] = '\0';
1873 bool ret = dll_address_to_library_name(
1874 CAST_FROM_FN_PTR(address, os::jvm_path),
1875 dli_fname, sizeof(dli_fname), NULL);
1876 assert(ret, "cannot locate libjvm");
1877 char *rp = NULL;
1878 if (ret && dli_fname[0] != '\0') {
1879 rp = os::Posix::realpath(dli_fname, buf, buflen);
1880 }
1881 if (rp == NULL) {
1882 return;
1883 }
1884
1885 if (Arguments::sun_java_launcher_is_altjvm()) {
1886 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1887 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so"
1888 // or "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.dylib". If "/jre/lib/"
1889 // appears at the right place in the string, then assume we are
1890 // installed in a JDK and we're done. Otherwise, check for a
1891 // JAVA_HOME environment variable and construct a path to the JVM
1892 // being overridden.
1893
1894 const char *p = buf + strlen(buf) - 1;
1895 for (int count = 0; p > buf && count < 5; ++count) {
1896 for (--p; p > buf && *p != '/'; --p)
1897 /* empty */ ;
1898 }
1899
1900 if (strncmp(p, "/jre/lib/", 9) != 0) {
1901 // Look for JAVA_HOME in the environment.
1902 char* java_home_var = ::getenv("JAVA_HOME");
1903 if (java_home_var != NULL && java_home_var[0] != 0) {
1904 char* jrelib_p;
1905 int len;
1906
1907 // Check the current module name "libjvm"
1908 p = strrchr(buf, '/');
1909 assert(strstr(p, "/libjvm") == p, "invalid library name");
1910
1911 rp = os::Posix::realpath(java_home_var, buf, buflen);
1912 if (rp == NULL) {
1913 return;
1914 }
1915
1916 // determine if this is a legacy image or modules image
1917 // modules image doesn't have "jre" subdirectory
1918 len = strlen(buf);
1919 assert(len < buflen, "Ran out of buffer space");
1920 jrelib_p = buf + len;
1921
1922 // Add the appropriate library subdir
1923 snprintf(jrelib_p, buflen-len, "/jre/lib");
1924 if (0 != access(buf, F_OK)) {
1925 snprintf(jrelib_p, buflen-len, "/lib");
1926 }
1927
1928 // Add the appropriate client or server subdir
1929 len = strlen(buf);
1930 jrelib_p = buf + len;
1931 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT);
1932 if (0 != access(buf, F_OK)) {
1933 snprintf(jrelib_p, buflen-len, "%s", "");
1934 }
1935
1936 // If the path exists within JAVA_HOME, add the JVM library name
1937 // to complete the path to JVM being overridden. Otherwise fallback
1938 // to the path to the current library.
1939 if (0 == access(buf, F_OK)) {
1940 // Use current module name "libjvm"
1941 len = strlen(buf);
1942 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX);
1943 } else {
1944 // Fall back to path of current library
1945 rp = os::Posix::realpath(dli_fname, buf, buflen);
1946 if (rp == NULL) {
1947 return;
1948 }
1949 }
1950 }
1951 }
1952 }
1953
1954 strncpy(saved_jvm_path, buf, MAXPATHLEN);
1955 saved_jvm_path[MAXPATHLEN - 1] = '\0';
1956 }
1957
print_jni_name_prefix_on(outputStream * st,int args_size)1958 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1959 // no prefix required, not even "_"
1960 }
1961
print_jni_name_suffix_on(outputStream * st,int args_size)1962 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1963 // no suffix required
1964 }
1965
1966 ////////////////////////////////////////////////////////////////////////////////
1967 // sun.misc.Signal support
1968
1969 static volatile jint sigint_count = 0;
1970
UserHandler(int sig,void * siginfo,void * context)1971 static void UserHandler(int sig, void *siginfo, void *context) {
1972 // 4511530 - sem_post is serialized and handled by the manager thread. When
1973 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1974 // don't want to flood the manager thread with sem_post requests.
1975 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) {
1976 return;
1977 }
1978
1979 // Ctrl-C is pressed during error reporting, likely because the error
1980 // handler fails to abort. Let VM die immediately.
1981 if (sig == SIGINT && VMError::is_error_reported()) {
1982 os::die();
1983 }
1984
1985 os::signal_notify(sig);
1986 }
1987
user_handler()1988 void* os::user_handler() {
1989 return CAST_FROM_FN_PTR(void*, UserHandler);
1990 }
1991
1992 #ifdef __APPLE__
1993 #define create_semaphore_timespec(sec, nsec) sec, nsec
1994 #else
1995 #define MAX_SECS 100000000
1996
1997 // This code is common to linux and solaris and will be moved to a
1998 // common place in dolphin.
1999 //
2000 // The passed in time value is either a relative time in nanoseconds
2001 // or an absolute time in milliseconds. Either way it has to be unpacked
2002 // into suitable seconds and nanoseconds components and stored in the
2003 // given timespec structure.
2004 // Given time is a 64-bit value and the time_t used in the timespec is only
2005 // a signed-32-bit value (except on 64-bit Linux) we have to watch for
2006 // overflow if times way in the future are given. Further on Solaris versions
2007 // prior to 10 there is a restriction (see cond_timedwait) that the specified
2008 // number of seconds, in abstime, is less than current_time + 100,000,000.
2009 // As it will be 28 years before "now + 100000000" will overflow we can
2010 // ignore overflow and just impose a hard-limit on seconds using the value
2011 // of "now + 100,000,000". This places a limit on the timeout of about 3.17
2012 // years from "now".
2013 //
unpackTime(timespec * absTime,bool isAbsolute,jlong time)2014 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
2015 assert(time > 0, "convertTime");
2016
2017 struct timeval now;
2018 int status = gettimeofday(&now, NULL);
2019 assert(status == 0, "gettimeofday");
2020
2021 time_t max_secs = now.tv_sec + MAX_SECS;
2022
2023 if (isAbsolute) {
2024 jlong secs = time / 1000;
2025 if (secs > max_secs) {
2026 absTime->tv_sec = max_secs;
2027 } else {
2028 absTime->tv_sec = secs;
2029 }
2030 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
2031 } else {
2032 jlong secs = time / NANOSECS_PER_SEC;
2033 if (secs >= MAX_SECS) {
2034 absTime->tv_sec = max_secs;
2035 absTime->tv_nsec = 0;
2036 } else {
2037 absTime->tv_sec = now.tv_sec + secs;
2038 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
2039 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
2040 absTime->tv_nsec -= NANOSECS_PER_SEC;
2041 ++absTime->tv_sec; // note: this must be <= max_secs
2042 }
2043 }
2044 }
2045 assert(absTime->tv_sec >= 0, "tv_sec < 0");
2046 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
2047 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
2048 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
2049 }
2050
create_semaphore_timespec(unsigned int sec,int nsec)2051 static struct timespec create_semaphore_timespec(unsigned int sec, int nsec) {
2052 struct timespec ts;
2053
2054 if (os::supports_monotonic_clock()) {
2055 ::clock_gettime(CLOCK_REALTIME, &ts);
2056 // see os_posix.cpp for discussion on overflow checking
2057 if (sec >= MAX_SECS) {
2058 ts.tv_sec += MAX_SECS;
2059 ts.tv_nsec = 0;
2060 } else {
2061 ts.tv_sec += sec;
2062 ts.tv_nsec += nsec;
2063 if (ts.tv_nsec >= NANOSECS_PER_SEC) {
2064 ts.tv_nsec -= NANOSECS_PER_SEC;
2065 ++ts.tv_sec; // note: this must be <= max_secs
2066 }
2067 }
2068 } else {
2069 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
2070 }
2071 return ts;
2072 }
2073 #endif
2074
2075 extern "C" {
2076 typedef void (*sa_handler_t)(int);
2077 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2078 }
2079
signal(int signal_number,void * handler)2080 void* os::signal(int signal_number, void* handler) {
2081 struct sigaction sigAct, oldSigAct;
2082
2083 sigfillset(&(sigAct.sa_mask));
2084 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
2085 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2086
2087 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
2088 // -1 means registration failed
2089 return (void *)-1;
2090 }
2091
2092 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2093 }
2094
signal_raise(int signal_number)2095 void os::signal_raise(int signal_number) {
2096 ::raise(signal_number);
2097 }
2098
2099 // The following code is moved from os.cpp for making this
2100 // code platform specific, which it is by its very nature.
2101
2102 // Will be modified when max signal is changed to be dynamic
sigexitnum_pd()2103 int os::sigexitnum_pd() {
2104 return NSIG;
2105 }
2106
2107 // a counter for each possible signal value
2108 static volatile jint pending_signals[NSIG+1] = { 0 };
2109 static Semaphore* sig_sem = NULL;
2110
jdk_misc_signal_init()2111 static void jdk_misc_signal_init() {
2112 // Initialize signal structures
2113 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
2114
2115 // Initialize signal semaphore
2116 sig_sem = new Semaphore();
2117 }
2118
signal_notify(int sig)2119 void os::signal_notify(int sig) {
2120 if (sig_sem != NULL) {
2121 Atomic::inc(&pending_signals[sig]);
2122 sig_sem->signal();
2123 } else {
2124 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init
2125 // initialization isn't called.
2126 assert(ReduceSignalUsage, "signal semaphore should be created");
2127 }
2128 }
2129
check_pending_signals()2130 static int check_pending_signals() {
2131 Atomic::store(0, &sigint_count);
2132 for (;;) {
2133 for (int i = 0; i < NSIG + 1; i++) {
2134 jint n = pending_signals[i];
2135 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2136 return i;
2137 }
2138 }
2139 JavaThread *thread = JavaThread::current();
2140 ThreadBlockInVM tbivm(thread);
2141
2142 bool threadIsSuspended;
2143 do {
2144 thread->set_suspend_equivalent();
2145 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2146 sig_sem->wait();
2147
2148 // were we externally suspended while we were waiting?
2149 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2150 if (threadIsSuspended) {
2151 // The semaphore has been incremented, but while we were waiting
2152 // another thread suspended us. We don't want to continue running
2153 // while suspended because that would surprise the thread that
2154 // suspended us.
2155 sig_sem->signal();
2156
2157 thread->java_suspend_self();
2158 }
2159 } while (threadIsSuspended);
2160 }
2161 }
2162
signal_wait()2163 int os::signal_wait() {
2164 return check_pending_signals();
2165 }
2166
2167 ////////////////////////////////////////////////////////////////////////////////
2168 // Virtual Memory
2169
vm_page_size()2170 int os::vm_page_size() {
2171 // Seems redundant as all get out
2172 assert(os::Bsd::page_size() != -1, "must call os::init");
2173 return os::Bsd::page_size();
2174 }
2175
2176 // Solaris allocates memory by pages.
vm_allocation_granularity()2177 int os::vm_allocation_granularity() {
2178 assert(os::Bsd::page_size() != -1, "must call os::init");
2179 return os::Bsd::page_size();
2180 }
2181
2182 // Rationale behind this function:
2183 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable
2184 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get
2185 // samples for JITted code. Here we create private executable mapping over the code cache
2186 // and then we can use standard (well, almost, as mapping can change) way to provide
2187 // info for the reporting script by storing timestamp and location of symbol
bsd_wrap_code(char * base,size_t size)2188 void bsd_wrap_code(char* base, size_t size) {
2189 static volatile jint cnt = 0;
2190
2191 if (!UseOprofile) {
2192 return;
2193 }
2194
2195 char buf[PATH_MAX + 1];
2196 int num = Atomic::add(1, &cnt);
2197
2198 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d",
2199 os::get_temp_directory(), os::current_process_id(), num);
2200 unlink(buf);
2201
2202 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU);
2203
2204 if (fd != -1) {
2205 off_t rv = ::lseek(fd, size-2, SEEK_SET);
2206 if (rv != (off_t)-1) {
2207 if (::write(fd, "", 1) == 1) {
2208 mmap(base, size,
2209 PROT_READ|PROT_WRITE|PROT_EXEC,
2210 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0);
2211 }
2212 }
2213 ::close(fd);
2214 unlink(buf);
2215 }
2216 }
2217
warn_fail_commit_memory(char * addr,size_t size,bool exec,int err)2218 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
2219 int err) {
2220 warning("INFO: os::commit_memory(" INTPTR_FORMAT ", " SIZE_FORMAT
2221 ", %d) failed; error='%s' (errno=%d)", (intptr_t)addr, size, exec,
2222 os::errno_name(err), err);
2223 }
2224
2225 // NOTE: Bsd kernel does not really reserve the pages for us.
2226 // All it does is to check if there are enough free pages
2227 // left at the time of mmap(). This could be a potential
2228 // problem.
pd_commit_memory(char * addr,size_t size,bool exec)2229 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2230 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2231 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot,
2232 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0);
2233 if (res != (uintptr_t) MAP_FAILED) {
2234 return true;
2235 }
2236
2237 // Warn about any commit errors we see in non-product builds just
2238 // in case mmap() doesn't work as described on the man page.
2239 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);)
2240
2241 return false;
2242 }
2243
pd_commit_memory(char * addr,size_t size,size_t alignment_hint,bool exec)2244 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
2245 bool exec) {
2246 // alignment_hint is ignored on this OS
2247 return pd_commit_memory(addr, size, exec);
2248 }
2249
pd_commit_memory_or_exit(char * addr,size_t size,bool exec,const char * mesg)2250 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2251 const char* mesg) {
2252 assert(mesg != NULL, "mesg must be specified");
2253 if (!pd_commit_memory(addr, size, exec)) {
2254 // add extra info in product mode for vm_exit_out_of_memory():
2255 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
2256 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
2257 }
2258 }
2259
pd_commit_memory_or_exit(char * addr,size_t size,size_t alignment_hint,bool exec,const char * mesg)2260 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2261 size_t alignment_hint, bool exec,
2262 const char* mesg) {
2263 // alignment_hint is ignored on this OS
2264 pd_commit_memory_or_exit(addr, size, exec, mesg);
2265 }
2266
pd_realign_memory(char * addr,size_t bytes,size_t alignment_hint)2267 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2268 }
2269
pd_free_memory(char * addr,size_t bytes,size_t alignment_hint)2270 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2271 ::madvise(addr, bytes, MADV_DONTNEED);
2272 }
2273
numa_make_global(char * addr,size_t bytes)2274 void os::numa_make_global(char *addr, size_t bytes) {
2275 }
2276
numa_make_local(char * addr,size_t bytes,int lgrp_hint)2277 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2278 }
2279
numa_topology_changed()2280 bool os::numa_topology_changed() { return false; }
2281
numa_get_groups_num()2282 size_t os::numa_get_groups_num() {
2283 return 1;
2284 }
2285
numa_get_group_id()2286 int os::numa_get_group_id() {
2287 return 0;
2288 }
2289
numa_get_leaf_groups(int * ids,size_t size)2290 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2291 if (size > 0) {
2292 ids[0] = 0;
2293 return 1;
2294 }
2295 return 0;
2296 }
2297
get_page_info(char * start,page_info * info)2298 bool os::get_page_info(char *start, page_info* info) {
2299 return false;
2300 }
2301
scan_pages(char * start,char * end,page_info * page_expected,page_info * page_found)2302 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2303 return end;
2304 }
2305
2306
pd_uncommit_memory(char * addr,size_t size)2307 bool os::pd_uncommit_memory(char* addr, size_t size) {
2308 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE,
2309 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0);
2310 return res != (uintptr_t) MAP_FAILED;
2311 }
2312
pd_create_stack_guard_pages(char * addr,size_t size)2313 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2314 return os::commit_memory(addr, size, !ExecMem);
2315 }
2316
2317 // If this is a growable mapping, remove the guard pages entirely by
2318 // munmap()ping them. If not, just call uncommit_memory().
remove_stack_guard_pages(char * addr,size_t size)2319 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2320 return os::uncommit_memory(addr, size);
2321 }
2322
2323 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory
2324 // at 'requested_addr'. If there are existing memory mappings at the same
2325 // location, however, they will be overwritten. If 'fixed' is false,
2326 // 'requested_addr' is only treated as a hint, the return value may or
2327 // may not start from the requested address. Unlike Bsd mmap(), this
2328 // function returns NULL to indicate failure.
anon_mmap(char * requested_addr,size_t bytes,bool fixed)2329 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) {
2330 char * addr;
2331 int flags;
2332
2333 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS;
2334 if (fixed) {
2335 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address");
2336 flags |= MAP_FIXED;
2337 }
2338
2339 // Map reserved/uncommitted pages PROT_NONE so we fail early if we
2340 // touch an uncommitted page. Otherwise, the read/write might
2341 // succeed if we have enough swap space to back the physical page.
2342 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE,
2343 flags, -1, 0);
2344
2345 return addr == MAP_FAILED ? NULL : addr;
2346 }
2347
anon_munmap(char * addr,size_t size)2348 static int anon_munmap(char * addr, size_t size) {
2349 return ::munmap(addr, size) == 0;
2350 }
2351
pd_reserve_memory(size_t bytes,char * requested_addr,size_t alignment_hint)2352 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2353 size_t alignment_hint) {
2354 return anon_mmap(requested_addr, bytes, (requested_addr != NULL));
2355 }
2356
pd_release_memory(char * addr,size_t size)2357 bool os::pd_release_memory(char* addr, size_t size) {
2358 return anon_munmap(addr, size);
2359 }
2360
bsd_mprotect(char * addr,size_t size,int prot)2361 static bool bsd_mprotect(char* addr, size_t size, int prot) {
2362 // Bsd wants the mprotect address argument to be page aligned.
2363 char* bottom = (char*)align_down((intptr_t)addr, os::Bsd::page_size());
2364
2365 // According to SUSv3, mprotect() should only be used with mappings
2366 // established by mmap(), and mmap() always maps whole pages. Unaligned
2367 // 'addr' likely indicates problem in the VM (e.g. trying to change
2368 // protection of malloc'ed or statically allocated memory). Check the
2369 // caller if you hit this assert.
2370 assert(addr == bottom, "sanity check");
2371
2372 size = align_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size());
2373 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(bottom), p2i(bottom+size), prot);
2374 return ::mprotect(bottom, size, prot) == 0;
2375 }
2376
2377 // Set protections specified
protect_memory(char * addr,size_t bytes,ProtType prot,bool is_committed)2378 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2379 bool is_committed) {
2380 unsigned int p = 0;
2381 switch (prot) {
2382 case MEM_PROT_NONE: p = PROT_NONE; break;
2383 case MEM_PROT_READ: p = PROT_READ; break;
2384 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2385 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2386 default:
2387 ShouldNotReachHere();
2388 }
2389 // is_committed is unused.
2390 return bsd_mprotect(addr, bytes, p);
2391 }
2392
guard_memory(char * addr,size_t size)2393 bool os::guard_memory(char* addr, size_t size) {
2394 return bsd_mprotect(addr, size, PROT_NONE);
2395 }
2396
unguard_memory(char * addr,size_t size)2397 bool os::unguard_memory(char* addr, size_t size) {
2398 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE);
2399 }
2400
hugetlbfs_sanity_check(bool warn,size_t page_size)2401 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) {
2402 return false;
2403 }
2404
2405 // Large page support
2406
2407 static size_t _large_page_size = 0;
2408
large_page_init()2409 void os::large_page_init() {
2410 }
2411
2412
reserve_memory_special(size_t bytes,size_t alignment,char * req_addr,bool exec)2413 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2414 fatal("This code is not used or maintained.");
2415
2416 // "exec" is passed in but not used. Creating the shared image for
2417 // the code cache doesn't have an SHM_X executable permission to check.
2418 assert(UseLargePages && UseSHM, "only for SHM large pages");
2419
2420 key_t key = IPC_PRIVATE;
2421 char *addr;
2422
2423 bool warn_on_failure = UseLargePages &&
2424 (!FLAG_IS_DEFAULT(UseLargePages) ||
2425 !FLAG_IS_DEFAULT(LargePageSizeInBytes));
2426
2427 // Create a large shared memory region to attach to based on size.
2428 // Currently, size is the total size of the heap
2429 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W);
2430 if (shmid == -1) {
2431 // Possible reasons for shmget failure:
2432 // 1. shmmax is too small for Java heap.
2433 // > check shmmax value: cat /proc/sys/kernel/shmmax
2434 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax
2435 // 2. not enough large page memory.
2436 // > check available large pages: cat /proc/meminfo
2437 // > increase amount of large pages:
2438 // echo new_value > /proc/sys/vm/nr_hugepages
2439 // Note 1: different Bsd may use different name for this property,
2440 // e.g. on Redhat AS-3 it is "hugetlb_pool".
2441 // Note 2: it's possible there's enough physical memory available but
2442 // they are so fragmented after a long run that they can't
2443 // coalesce into large pages. Try to reserve large pages when
2444 // the system is still "fresh".
2445 if (warn_on_failure) {
2446 warning("Failed to reserve shared memory (errno = %d).", errno);
2447 }
2448 return NULL;
2449 }
2450
2451 // attach to the region
2452 addr = (char*)shmat(shmid, req_addr, 0);
2453 int err = errno;
2454
2455 // Remove shmid. If shmat() is successful, the actual shared memory segment
2456 // will be deleted when it's detached by shmdt() or when the process
2457 // terminates. If shmat() is not successful this will remove the shared
2458 // segment immediately.
2459 shmctl(shmid, IPC_RMID, NULL);
2460
2461 if ((intptr_t)addr == -1) {
2462 if (warn_on_failure) {
2463 warning("Failed to attach shared memory (errno = %d).", err);
2464 }
2465 return NULL;
2466 }
2467
2468 // The memory is committed
2469 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, CALLER_PC);
2470
2471 return addr;
2472 }
2473
release_memory_special(char * base,size_t bytes)2474 bool os::release_memory_special(char* base, size_t bytes) {
2475 if (MemTracker::tracking_level() > NMT_minimal) {
2476 Tracker tkr(Tracker::release);
2477 // detaching the SHM segment will also delete it, see reserve_memory_special()
2478 int rslt = shmdt(base);
2479 if (rslt == 0) {
2480 tkr.record((address)base, bytes);
2481 return true;
2482 } else {
2483 return false;
2484 }
2485 } else {
2486 return shmdt(base) == 0;
2487 }
2488 }
2489
large_page_size()2490 size_t os::large_page_size() {
2491 return _large_page_size;
2492 }
2493
2494 // HugeTLBFS allows application to commit large page memory on demand;
2495 // with SysV SHM the entire memory region must be allocated as shared
2496 // memory.
can_commit_large_page_memory()2497 bool os::can_commit_large_page_memory() {
2498 return UseHugeTLBFS;
2499 }
2500
can_execute_large_page_memory()2501 bool os::can_execute_large_page_memory() {
2502 return UseHugeTLBFS;
2503 }
2504
pd_attempt_reserve_memory_at(size_t bytes,char * requested_addr,int file_desc)2505 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
2506 assert(file_desc >= 0, "file_desc is not valid");
2507 char* result = pd_attempt_reserve_memory_at(bytes, requested_addr);
2508 if (result != NULL) {
2509 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
2510 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
2511 }
2512 }
2513 return result;
2514 }
2515
2516 // Reserve memory at an arbitrary address, only if that area is
2517 // available (and not reserved for something else).
2518
pd_attempt_reserve_memory_at(size_t bytes,char * requested_addr)2519 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2520 const int max_tries = 10;
2521 char* base[max_tries];
2522 size_t size[max_tries];
2523 const size_t gap = 0x000000;
2524
2525 // Assert only that the size is a multiple of the page size, since
2526 // that's all that mmap requires, and since that's all we really know
2527 // about at this low abstraction level. If we need higher alignment,
2528 // we can either pass an alignment to this method or verify alignment
2529 // in one of the methods further up the call chain. See bug 5044738.
2530 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2531
2532 // Repeatedly allocate blocks until the block is allocated at the
2533 // right spot.
2534
2535 // Bsd mmap allows caller to pass an address as hint; give it a try first,
2536 // if kernel honors the hint then we can return immediately.
2537 char * addr = anon_mmap(requested_addr, bytes, false);
2538 if (addr == requested_addr) {
2539 return requested_addr;
2540 }
2541
2542 if (addr != NULL) {
2543 // mmap() is successful but it fails to reserve at the requested address
2544 anon_munmap(addr, bytes);
2545 }
2546
2547 int i;
2548 for (i = 0; i < max_tries; ++i) {
2549 base[i] = reserve_memory(bytes);
2550
2551 if (base[i] != NULL) {
2552 // Is this the block we wanted?
2553 if (base[i] == requested_addr) {
2554 size[i] = bytes;
2555 break;
2556 }
2557
2558 // Does this overlap the block we wanted? Give back the overlapped
2559 // parts and try again.
2560
2561 ptrdiff_t top_overlap = requested_addr + (bytes + gap) - base[i];
2562 if (top_overlap >= 0 && (size_t)top_overlap < bytes) {
2563 unmap_memory(base[i], top_overlap);
2564 base[i] += top_overlap;
2565 size[i] = bytes - top_overlap;
2566 } else {
2567 ptrdiff_t bottom_overlap = base[i] + bytes - requested_addr;
2568 if (bottom_overlap >= 0 && (size_t)bottom_overlap < bytes) {
2569 unmap_memory(requested_addr, bottom_overlap);
2570 size[i] = bytes - bottom_overlap;
2571 } else {
2572 size[i] = bytes;
2573 }
2574 }
2575 }
2576 }
2577
2578 // Give back the unused reserved pieces.
2579
2580 for (int j = 0; j < i; ++j) {
2581 if (base[j] != NULL) {
2582 unmap_memory(base[j], size[j]);
2583 }
2584 }
2585
2586 if (i < max_tries) {
2587 return requested_addr;
2588 } else {
2589 return NULL;
2590 }
2591 }
2592
read(int fd,void * buf,unsigned int nBytes)2593 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2594 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes));
2595 }
2596
read_at(int fd,void * buf,unsigned int nBytes,jlong offset)2597 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2598 RESTARTABLE_RETURN_INT(::pread(fd, buf, nBytes, offset));
2599 }
2600
2601 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
infinite_sleep()2602 void os::infinite_sleep() {
2603 while (true) { // sleep forever ...
2604 ::sleep(100); // ... 100 seconds at a time
2605 }
2606 }
2607
2608 // Used to convert frequent JVM_Yield() to nops
dont_yield()2609 bool os::dont_yield() {
2610 return DontYieldALot;
2611 }
2612
naked_yield()2613 void os::naked_yield() {
2614 sched_yield();
2615 }
2616
2617 ////////////////////////////////////////////////////////////////////////////////
2618 // thread priority support
2619
2620 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER
2621 // only supports dynamic priority, static priority must be zero. For real-time
2622 // applications, Bsd supports SCHED_RR which allows static priority (1-99).
2623 // However, for large multi-threaded applications, SCHED_RR is not only slower
2624 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out
2625 // of 5 runs - Sep 2005).
2626 //
2627 // The following code actually changes the niceness of kernel-thread/LWP. It
2628 // has an assumption that setpriority() only modifies one kernel-thread/LWP,
2629 // not the entire user process, and user level threads are 1:1 mapped to kernel
2630 // threads. It has always been the case, but could change in the future. For
2631 // this reason, the code should not be used as default (ThreadPriorityPolicy=0).
2632 // It is only used when ThreadPriorityPolicy=1 and may require system level permission
2633 // (e.g., root privilege or CAP_SYS_NICE capability).
2634
2635 #if !defined(__APPLE__)
2636 int os::java_to_os_priority[CriticalPriority + 1] = {
2637 19, // 0 Entry should never be used
2638
2639 0, // 1 MinPriority
2640 3, // 2
2641 6, // 3
2642
2643 10, // 4
2644 15, // 5 NormPriority
2645 18, // 6
2646
2647 21, // 7
2648 25, // 8
2649 28, // 9 NearMaxPriority
2650
2651 31, // 10 MaxPriority
2652
2653 31 // 11 CriticalPriority
2654 };
2655 #else
2656 // Using Mach high-level priority assignments
2657 int os::java_to_os_priority[CriticalPriority + 1] = {
2658 0, // 0 Entry should never be used (MINPRI_USER)
2659
2660 27, // 1 MinPriority
2661 28, // 2
2662 29, // 3
2663
2664 30, // 4
2665 31, // 5 NormPriority (BASEPRI_DEFAULT)
2666 32, // 6
2667
2668 33, // 7
2669 34, // 8
2670 35, // 9 NearMaxPriority
2671
2672 36, // 10 MaxPriority
2673
2674 36 // 11 CriticalPriority
2675 };
2676 #endif
2677
prio_init()2678 static int prio_init() {
2679 if (ThreadPriorityPolicy == 1) {
2680 if (geteuid() != 0) {
2681 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy) && !FLAG_IS_JIMAGE_RESOURCE(ThreadPriorityPolicy)) {
2682 warning("-XX:ThreadPriorityPolicy=1 may require system level permission, " \
2683 "e.g., being the root user. If the necessary permission is not " \
2684 "possessed, changes to priority will be silently ignored.");
2685 }
2686 }
2687 }
2688 if (UseCriticalJavaThreadPriority) {
2689 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
2690 }
2691 return 0;
2692 }
2693
set_native_priority(Thread * thread,int newpri)2694 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2695 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) return OS_OK;
2696
2697 struct sched_param sp;
2698 int policy;
2699
2700 if (pthread_getschedparam(thread->osthread()->pthread_id(), &policy, &sp) != 0) {
2701 return OS_ERR;
2702 }
2703
2704 sp.sched_priority = newpri;
2705 if (pthread_setschedparam(thread->osthread()->pthread_id(), policy, &sp) != 0) {
2706 return OS_ERR;
2707 }
2708
2709 return OS_OK;
2710 }
2711
get_native_priority(const Thread * const thread,int * priority_ptr)2712 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2713 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) {
2714 *priority_ptr = java_to_os_priority[NormPriority];
2715 return OS_OK;
2716 }
2717
2718 errno = 0;
2719 int policy;
2720 struct sched_param sp;
2721
2722 int res = pthread_getschedparam(thread->osthread()->pthread_id(), &policy, &sp);
2723 if (res != 0) {
2724 *priority_ptr = -1;
2725 return OS_ERR;
2726 } else {
2727 *priority_ptr = sp.sched_priority;
2728 return OS_OK;
2729 }
2730 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR);
2731 }
2732
2733 // Hint to the underlying OS that a task switch would not be good.
2734 // Void return because it's a hint and can fail.
hint_no_preempt()2735 void os::hint_no_preempt() {}
2736
2737 ////////////////////////////////////////////////////////////////////////////////
2738 // suspend/resume support
2739
2740 // The low-level signal-based suspend/resume support is a remnant from the
2741 // old VM-suspension that used to be for java-suspension, safepoints etc,
2742 // within hotspot. Currently used by JFR's OSThreadSampler
2743 //
2744 // The remaining code is greatly simplified from the more general suspension
2745 // code that used to be used.
2746 //
2747 // The protocol is quite simple:
2748 // - suspend:
2749 // - sends a signal to the target thread
2750 // - polls the suspend state of the osthread using a yield loop
2751 // - target thread signal handler (SR_handler) sets suspend state
2752 // and blocks in sigsuspend until continued
2753 // - resume:
2754 // - sets target osthread state to continue
2755 // - sends signal to end the sigsuspend loop in the SR_handler
2756 //
2757 // Note that the SR_lock plays no role in this suspend/resume protocol,
2758 // but is checked for NULL in SR_handler as a thread termination indicator.
2759 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
2760 //
2761 // Note that resume_clear_context() and suspend_save_context() are needed
2762 // by SR_handler(), so that fetch_frame_from_ucontext() works,
2763 // which in part is used by:
2764 // - Forte Analyzer: AsyncGetCallTrace()
2765 // - StackBanging: get_frame_at_stack_banging_point()
2766
resume_clear_context(OSThread * osthread)2767 static void resume_clear_context(OSThread *osthread) {
2768 osthread->set_ucontext(NULL);
2769 osthread->set_siginfo(NULL);
2770 }
2771
suspend_save_context(OSThread * osthread,siginfo_t * siginfo,ucontext_t * context)2772 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2773 osthread->set_ucontext(context);
2774 osthread->set_siginfo(siginfo);
2775 }
2776
2777 // Handler function invoked when a thread's execution is suspended or
2778 // resumed. We have to be careful that only async-safe functions are
2779 // called here (Note: most pthread functions are not async safe and
2780 // should be avoided.)
2781 //
2782 // Note: sigwait() is a more natural fit than sigsuspend() from an
2783 // interface point of view, but sigwait() prevents the signal hander
2784 // from being run. libpthread would get very confused by not having
2785 // its signal handlers run and prevents sigwait()'s use with the
2786 // mutex granting granting signal.
2787 //
2788 // Currently only ever called on the VMThread or JavaThread
2789 //
2790 #ifdef __APPLE__
2791 static OSXSemaphore sr_semaphore;
2792 #else
2793 static PosixSemaphore sr_semaphore;
2794 #endif
2795
SR_handler(int sig,siginfo_t * siginfo,ucontext_t * context)2796 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2797 // Save and restore errno to avoid confusing native code with EINTR
2798 // after sigsuspend.
2799 int old_errno = errno;
2800
2801 Thread* thread = Thread::current_or_null_safe();
2802 assert(thread != NULL, "Missing current thread in SR_handler");
2803
2804 // On some systems we have seen signal delivery get "stuck" until the signal
2805 // mask is changed as part of thread termination. Check that the current thread
2806 // has not already terminated (via SR_lock()) - else the following assertion
2807 // will fail because the thread is no longer a JavaThread as the ~JavaThread
2808 // destructor has completed.
2809
2810 if (thread->SR_lock() == NULL) {
2811 return;
2812 }
2813
2814 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2815
2816 OSThread* osthread = thread->osthread();
2817
2818 os::SuspendResume::State current = osthread->sr.state();
2819 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2820 suspend_save_context(osthread, siginfo, context);
2821
2822 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2823 os::SuspendResume::State state = osthread->sr.suspended();
2824 if (state == os::SuspendResume::SR_SUSPENDED) {
2825 sigset_t suspend_set; // signals for sigsuspend()
2826
2827 // get current set of blocked signals and unblock resume signal
2828 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2829 sigdelset(&suspend_set, SR_signum);
2830
2831 sr_semaphore.signal();
2832 // wait here until we are resumed
2833 while (1) {
2834 sigsuspend(&suspend_set);
2835
2836 os::SuspendResume::State result = osthread->sr.running();
2837 if (result == os::SuspendResume::SR_RUNNING) {
2838 sr_semaphore.signal();
2839 break;
2840 } else if (result != os::SuspendResume::SR_SUSPENDED) {
2841 ShouldNotReachHere();
2842 }
2843 }
2844
2845 } else if (state == os::SuspendResume::SR_RUNNING) {
2846 // request was cancelled, continue
2847 } else {
2848 ShouldNotReachHere();
2849 }
2850
2851 resume_clear_context(osthread);
2852 } else if (current == os::SuspendResume::SR_RUNNING) {
2853 // request was cancelled, continue
2854 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2855 // ignore
2856 } else {
2857 // ignore
2858 }
2859
2860 errno = old_errno;
2861 }
2862
2863
SR_initialize()2864 static int SR_initialize() {
2865 struct sigaction act;
2866 char *s;
2867 // Get signal number to use for suspend/resume
2868 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2869 int sig = ::strtol(s, 0, 10);
2870 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769.
2871 sig < NSIG) { // Must be legal signal and fit into sigflags[].
2872 SR_signum = sig;
2873 } else {
2874 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.",
2875 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum);
2876 }
2877 }
2878
2879 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2880 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2881
2882 sigemptyset(&SR_sigset);
2883 sigaddset(&SR_sigset, SR_signum);
2884
2885 // Set up signal handler for suspend/resume
2886 act.sa_flags = SA_RESTART|SA_SIGINFO;
2887 act.sa_handler = (void (*)(int)) SR_handler;
2888
2889 // SR_signum is blocked by default.
2890 // 4528190 - We also need to block pthread restart signal (32 on all
2891 // supported Bsd platforms). Note that BsdThreads need to block
2892 // this signal for all threads to work properly. So we don't have
2893 // to use hard-coded signal number when setting up the mask.
2894 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2895
2896 if (sigaction(SR_signum, &act, 0) == -1) {
2897 return -1;
2898 }
2899
2900 // Save signal flag
2901 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags);
2902 return 0;
2903 }
2904
sr_notify(OSThread * osthread)2905 static int sr_notify(OSThread* osthread) {
2906 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2907 assert_status(status == 0, status, "pthread_kill");
2908 return status;
2909 }
2910
2911 // "Randomly" selected value for how long we want to spin
2912 // before bailing out on suspending a thread, also how often
2913 // we send a signal to a thread we want to resume
2914 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2915 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2916
2917 // returns true on success and false on error - really an error is fatal
2918 // but this seems the normal response to library errors
do_suspend(OSThread * osthread)2919 static bool do_suspend(OSThread* osthread) {
2920 assert(osthread->sr.is_running(), "thread should be running");
2921 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
2922
2923 // mark as suspended and send signal
2924 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2925 // failed to switch, state wasn't running?
2926 ShouldNotReachHere();
2927 return false;
2928 }
2929
2930 if (sr_notify(osthread) != 0) {
2931 ShouldNotReachHere();
2932 }
2933
2934 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2935 while (true) {
2936 if (sr_semaphore.timedwait(create_semaphore_timespec(0, 2 * NANOSECS_PER_MILLISEC))) {
2937 break;
2938 } else {
2939 // timeout
2940 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2941 if (cancelled == os::SuspendResume::SR_RUNNING) {
2942 return false;
2943 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2944 // make sure that we consume the signal on the semaphore as well
2945 sr_semaphore.wait();
2946 break;
2947 } else {
2948 ShouldNotReachHere();
2949 return false;
2950 }
2951 }
2952 }
2953
2954 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2955 return true;
2956 }
2957
do_resume(OSThread * osthread)2958 static void do_resume(OSThread* osthread) {
2959 assert(osthread->sr.is_suspended(), "thread should be suspended");
2960 assert(!sr_semaphore.trywait(), "invalid semaphore state");
2961
2962 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2963 // failed to switch to WAKEUP_REQUEST
2964 ShouldNotReachHere();
2965 return;
2966 }
2967
2968 while (true) {
2969 if (sr_notify(osthread) == 0) {
2970 if (sr_semaphore.timedwait(create_semaphore_timespec(0, 2 * NANOSECS_PER_MILLISEC))) {
2971 if (osthread->sr.is_running()) {
2972 return;
2973 }
2974 }
2975 } else {
2976 ShouldNotReachHere();
2977 }
2978 }
2979
2980 guarantee(osthread->sr.is_running(), "Must be running!");
2981 }
2982
2983 ///////////////////////////////////////////////////////////////////////////////////
2984 // signal handling (except suspend/resume)
2985
2986 // This routine may be used by user applications as a "hook" to catch signals.
2987 // The user-defined signal handler must pass unrecognized signals to this
2988 // routine, and if it returns true (non-zero), then the signal handler must
2989 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2990 // routine will never retun false (zero), but instead will execute a VM panic
2991 // routine kill the process.
2992 //
2993 // If this routine returns false, it is OK to call it again. This allows
2994 // the user-defined signal handler to perform checks either before or after
2995 // the VM performs its own checks. Naturally, the user code would be making
2996 // a serious error if it tried to handle an exception (such as a null check
2997 // or breakpoint) that the VM was generating for its own correct operation.
2998 //
2999 // This routine may recognize any of the following kinds of signals:
3000 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
3001 // It should be consulted by handlers for any of those signals.
3002 //
3003 // The caller of this routine must pass in the three arguments supplied
3004 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
3005 // field of the structure passed to sigaction(). This routine assumes that
3006 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
3007 //
3008 // Note that the VM will print warnings if it detects conflicting signal
3009 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
3010 //
3011 extern "C" JNIEXPORT int JVM_handle_bsd_signal(int signo, siginfo_t* siginfo,
3012 void* ucontext,
3013 int abort_if_unrecognized);
3014
signalHandler(int sig,siginfo_t * info,void * uc)3015 static void signalHandler(int sig, siginfo_t* info, void* uc) {
3016 assert(info != NULL && uc != NULL, "it must be old kernel");
3017 int orig_errno = errno; // Preserve errno value over signal handler.
3018 JVM_handle_bsd_signal(sig, info, uc, true);
3019 errno = orig_errno;
3020 }
3021
3022
3023 // This boolean allows users to forward their own non-matching signals
3024 // to JVM_handle_bsd_signal, harmlessly.
3025 bool os::Bsd::signal_handlers_are_installed = false;
3026
3027 // For signal-chaining
3028 bool os::Bsd::libjsig_is_loaded = false;
3029 typedef struct sigaction *(*get_signal_t)(int);
3030 get_signal_t os::Bsd::get_signal_action = NULL;
3031
get_chained_signal_action(int sig)3032 struct sigaction* os::Bsd::get_chained_signal_action(int sig) {
3033 struct sigaction *actp = NULL;
3034
3035 if (libjsig_is_loaded) {
3036 // Retrieve the old signal handler from libjsig
3037 actp = (*get_signal_action)(sig);
3038 }
3039 if (actp == NULL) {
3040 // Retrieve the preinstalled signal handler from jvm
3041 actp = os::Posix::get_preinstalled_handler(sig);
3042 }
3043
3044 return actp;
3045 }
3046
call_chained_handler(struct sigaction * actp,int sig,siginfo_t * siginfo,void * context)3047 static bool call_chained_handler(struct sigaction *actp, int sig,
3048 siginfo_t *siginfo, void *context) {
3049 // Call the old signal handler
3050 if (actp->sa_handler == SIG_DFL) {
3051 // It's more reasonable to let jvm treat it as an unexpected exception
3052 // instead of taking the default action.
3053 return false;
3054 } else if (actp->sa_handler != SIG_IGN) {
3055 if ((actp->sa_flags & SA_NODEFER) == 0) {
3056 // automaticlly block the signal
3057 sigaddset(&(actp->sa_mask), sig);
3058 }
3059
3060 sa_handler_t hand;
3061 sa_sigaction_t sa;
3062 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3063 // retrieve the chained handler
3064 if (siginfo_flag_set) {
3065 sa = actp->sa_sigaction;
3066 } else {
3067 hand = actp->sa_handler;
3068 }
3069
3070 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3071 actp->sa_handler = SIG_DFL;
3072 }
3073
3074 // try to honor the signal mask
3075 sigset_t oset;
3076 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3077
3078 // call into the chained handler
3079 if (siginfo_flag_set) {
3080 (*sa)(sig, siginfo, context);
3081 } else {
3082 (*hand)(sig);
3083 }
3084
3085 // restore the signal mask
3086 pthread_sigmask(SIG_SETMASK, &oset, 0);
3087 }
3088 // Tell jvm's signal handler the signal is taken care of.
3089 return true;
3090 }
3091
chained_handler(int sig,siginfo_t * siginfo,void * context)3092 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3093 bool chained = false;
3094 // signal-chaining
3095 if (UseSignalChaining) {
3096 struct sigaction *actp = get_chained_signal_action(sig);
3097 if (actp != NULL) {
3098 chained = call_chained_handler(actp, sig, siginfo, context);
3099 }
3100 }
3101 return chained;
3102 }
3103
3104 // for diagnostic
3105 int sigflags[NSIG];
3106
get_our_sigflags(int sig)3107 int os::Bsd::get_our_sigflags(int sig) {
3108 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3109 return sigflags[sig];
3110 }
3111
set_our_sigflags(int sig,int flags)3112 void os::Bsd::set_our_sigflags(int sig, int flags) {
3113 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3114 if (sig > 0 && sig < NSIG) {
3115 sigflags[sig] = flags;
3116 }
3117 }
3118
set_signal_handler(int sig,bool set_installed)3119 void os::Bsd::set_signal_handler(int sig, bool set_installed) {
3120 // Check for overwrite.
3121 struct sigaction oldAct;
3122 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3123
3124 void* oldhand = oldAct.sa_sigaction
3125 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3126 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3127 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3128 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3129 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) {
3130 if (AllowUserSignalHandlers || !set_installed) {
3131 // Do not overwrite; user takes responsibility to forward to us.
3132 return;
3133 } else if (UseSignalChaining) {
3134 // save the old handler in jvm
3135 os::Posix::save_preinstalled_handler(sig, oldAct);
3136 // libjsig also interposes the sigaction() call below and saves the
3137 // old sigaction on it own.
3138 } else {
3139 fatal("Encountered unexpected pre-existing sigaction handler "
3140 "%#lx for signal %d.", (long)oldhand, sig);
3141 }
3142 }
3143
3144 struct sigaction sigAct;
3145 sigfillset(&(sigAct.sa_mask));
3146 sigAct.sa_handler = SIG_DFL;
3147 if (!set_installed) {
3148 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3149 } else {
3150 sigAct.sa_sigaction = signalHandler;
3151 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3152 }
3153 #ifdef __APPLE__
3154 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV
3155 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages"
3156 // if the signal handler declares it will handle it on alternate stack.
3157 // Notice we only declare we will handle it on alt stack, but we are not
3158 // actually going to use real alt stack - this is just a workaround.
3159 // Please see ux_exception.c, method catch_mach_exception_raise for details
3160 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c
3161 if (sig == SIGSEGV) {
3162 sigAct.sa_flags |= SA_ONSTACK;
3163 }
3164 #endif
3165
3166 // Save flags, which are set by ours
3167 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3168 sigflags[sig] = sigAct.sa_flags;
3169
3170 int ret = sigaction(sig, &sigAct, &oldAct);
3171 assert(ret == 0, "check");
3172
3173 void* oldhand2 = oldAct.sa_sigaction
3174 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3175 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3176 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3177 }
3178
3179 // install signal handlers for signals that HotSpot needs to
3180 // handle in order to support Java-level exception handling.
3181
install_signal_handlers()3182 void os::Bsd::install_signal_handlers() {
3183 if (!signal_handlers_are_installed) {
3184 signal_handlers_are_installed = true;
3185
3186 // signal-chaining
3187 typedef void (*signal_setting_t)();
3188 signal_setting_t begin_signal_setting = NULL;
3189 signal_setting_t end_signal_setting = NULL;
3190 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3191 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3192 if (begin_signal_setting != NULL) {
3193 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3194 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3195 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3196 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3197 libjsig_is_loaded = true;
3198 assert(UseSignalChaining, "should enable signal-chaining");
3199 }
3200 if (libjsig_is_loaded) {
3201 // Tell libjsig jvm is setting signal handlers
3202 (*begin_signal_setting)();
3203 }
3204
3205 set_signal_handler(SIGSEGV, true);
3206 set_signal_handler(SIGPIPE, true);
3207 set_signal_handler(SIGBUS, true);
3208 set_signal_handler(SIGILL, true);
3209 set_signal_handler(SIGFPE, true);
3210 #if defined(PPC64)
3211 set_signal_handler(SIGTRAP, true);
3212 #endif
3213 set_signal_handler(SIGXFSZ, true);
3214
3215 #if defined(__APPLE__)
3216 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including
3217 // signals caught and handled by the JVM. To work around this, we reset the mach task
3218 // signal handler that's placed on our process by CrashReporter. This disables
3219 // CrashReporter-based reporting.
3220 //
3221 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes
3222 // on caught fatal signals.
3223 //
3224 // Additionally, gdb installs both standard BSD signal handlers, and mach exception
3225 // handlers. By replacing the existing task exception handler, we disable gdb's mach
3226 // exception handling, while leaving the standard BSD signal handlers functional.
3227 kern_return_t kr;
3228 kr = task_set_exception_ports(mach_task_self(),
3229 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC,
3230 MACH_PORT_NULL,
3231 EXCEPTION_STATE_IDENTITY,
3232 MACHINE_THREAD_STATE);
3233
3234 assert(kr == KERN_SUCCESS, "could not set mach task signal handler");
3235 #endif
3236
3237 if (libjsig_is_loaded) {
3238 // Tell libjsig jvm finishes setting signal handlers
3239 (*end_signal_setting)();
3240 }
3241
3242 // We don't activate signal checker if libjsig is in place, we trust ourselves
3243 // and if UserSignalHandler is installed all bets are off
3244 if (CheckJNICalls) {
3245 if (libjsig_is_loaded) {
3246 if (PrintJNIResolving) {
3247 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3248 }
3249 check_signals = false;
3250 }
3251 if (AllowUserSignalHandlers) {
3252 if (PrintJNIResolving) {
3253 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3254 }
3255 check_signals = false;
3256 }
3257 }
3258 }
3259 }
3260
3261
3262 /////
3263 // glibc on Bsd platform uses non-documented flag
3264 // to indicate, that some special sort of signal
3265 // trampoline is used.
3266 // We will never set this flag, and we should
3267 // ignore this flag in our diagnostic
3268 #ifdef SIGNIFICANT_SIGNAL_MASK
3269 #undef SIGNIFICANT_SIGNAL_MASK
3270 #endif
3271
3272 #ifdef __APPLE__
3273 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000)
3274 #else
3275 #define SIGNIFICANT_SIGNAL_MASK (~0x00000000)
3276 #endif
3277
get_signal_handler_name(address handler,char * buf,int buflen)3278 static const char* get_signal_handler_name(address handler,
3279 char* buf, int buflen) {
3280 int offset = 0;
3281 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3282 if (found) {
3283 // skip directory names
3284 const char *p1, *p2;
3285 p1 = buf;
3286 size_t len = strlen(os::file_separator());
3287 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3288 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
3289 } else {
3290 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3291 }
3292 return buf;
3293 }
3294
print_signal_handler(outputStream * st,int sig,char * buf,size_t buflen)3295 static void print_signal_handler(outputStream* st, int sig,
3296 char* buf, size_t buflen) {
3297 struct sigaction sa;
3298
3299 sigaction(sig, NULL, &sa);
3300
3301 // See comment for SIGNIFICANT_SIGNAL_MASK define
3302 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
3303
3304 st->print("%s: ", os::exception_name(sig, buf, buflen));
3305
3306 address handler = (sa.sa_flags & SA_SIGINFO)
3307 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3308 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3309
3310 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3311 st->print("SIG_DFL");
3312 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3313 st->print("SIG_IGN");
3314 } else {
3315 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3316 }
3317
3318 st->print(", sa_mask[0]=");
3319 os::Posix::print_signal_set_short(st, &sa.sa_mask);
3320
3321 address rh = VMError::get_resetted_sighandler(sig);
3322 // May be, handler was resetted by VMError?
3323 if (rh != NULL) {
3324 handler = rh;
3325 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK;
3326 }
3327
3328 st->print(", sa_flags=");
3329 os::Posix::print_sa_flags(st, sa.sa_flags);
3330
3331 // Check: is it our handler?
3332 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) ||
3333 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3334 // It is our signal handler
3335 // check for flags, reset system-used one!
3336 if ((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) {
3337 st->print(
3338 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3339 os::Bsd::get_our_sigflags(sig));
3340 }
3341 }
3342 st->cr();
3343 }
3344
3345
3346 #define DO_SIGNAL_CHECK(sig) \
3347 do { \
3348 if (!sigismember(&check_signal_done, sig)) { \
3349 os::Bsd::check_signal_handler(sig); \
3350 } \
3351 } while (0)
3352
3353 // This method is a periodic task to check for misbehaving JNI applications
3354 // under CheckJNI, we can add any periodic checks here
3355
run_periodic_checks()3356 void os::run_periodic_checks() {
3357
3358 if (check_signals == false) return;
3359
3360 // SEGV and BUS if overridden could potentially prevent
3361 // generation of hs*.log in the event of a crash, debugging
3362 // such a case can be very challenging, so we absolutely
3363 // check the following for a good measure:
3364 DO_SIGNAL_CHECK(SIGSEGV);
3365 DO_SIGNAL_CHECK(SIGILL);
3366 DO_SIGNAL_CHECK(SIGFPE);
3367 DO_SIGNAL_CHECK(SIGBUS);
3368 DO_SIGNAL_CHECK(SIGPIPE);
3369 DO_SIGNAL_CHECK(SIGXFSZ);
3370 #if defined(PPC64)
3371 DO_SIGNAL_CHECK(SIGTRAP);
3372 #endif
3373
3374
3375 // ReduceSignalUsage allows the user to override these handlers
3376 // see comments at the very top and jvm_md.h
3377 if (!ReduceSignalUsage) {
3378 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3379 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3380 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3381 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3382 }
3383
3384 DO_SIGNAL_CHECK(SR_signum);
3385 }
3386
3387 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3388
3389 static os_sigaction_t os_sigaction = NULL;
3390
check_signal_handler(int sig)3391 void os::Bsd::check_signal_handler(int sig) {
3392 char buf[O_BUFLEN];
3393 address jvmHandler = NULL;
3394
3395
3396 struct sigaction act;
3397 if (os_sigaction == NULL) {
3398 // only trust the default sigaction, in case it has been interposed
3399 #if defined(__NetBSD__)
3400 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "__sigaction14");
3401 #else
3402 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3403 #endif
3404 if (os_sigaction == NULL) return;
3405 }
3406
3407 os_sigaction(sig, (struct sigaction*)NULL, &act);
3408
3409
3410 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
3411
3412 address thisHandler = (act.sa_flags & SA_SIGINFO)
3413 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3414 : CAST_FROM_FN_PTR(address, act.sa_handler);
3415
3416
3417 switch (sig) {
3418 case SIGSEGV:
3419 case SIGBUS:
3420 case SIGFPE:
3421 case SIGPIPE:
3422 case SIGILL:
3423 case SIGXFSZ:
3424 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler);
3425 break;
3426
3427 case SHUTDOWN1_SIGNAL:
3428 case SHUTDOWN2_SIGNAL:
3429 case SHUTDOWN3_SIGNAL:
3430 case BREAK_SIGNAL:
3431 jvmHandler = (address)user_handler();
3432 break;
3433
3434 default:
3435 if (sig == SR_signum) {
3436 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3437 } else {
3438 return;
3439 }
3440 break;
3441 }
3442
3443 if (thisHandler != jvmHandler) {
3444 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3445 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3446 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3447 // No need to check this sig any longer
3448 sigaddset(&check_signal_done, sig);
3449 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3450 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3451 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3452 exception_name(sig, buf, O_BUFLEN));
3453 }
3454 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) {
3455 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3456 tty->print("expected:");
3457 os::Posix::print_sa_flags(tty, os::Bsd::get_our_sigflags(sig));
3458 tty->cr();
3459 tty->print(" found:");
3460 os::Posix::print_sa_flags(tty, act.sa_flags);
3461 tty->cr();
3462 // No need to check this sig any longer
3463 sigaddset(&check_signal_done, sig);
3464 }
3465
3466 // Dump all the signal
3467 if (sigismember(&check_signal_done, sig)) {
3468 print_signal_handlers(tty, buf, O_BUFLEN);
3469 }
3470 }
3471
3472 extern void report_error(char* file_name, int line_no, char* title,
3473 char* format, ...);
3474
3475 // this is called _before_ the most of global arguments have been parsed
init(void)3476 void os::init(void) {
3477 char dummy; // used to get a guess on initial stack address
3478
3479 // With BsdThreads the JavaMain thread pid (primordial thread)
3480 // is different than the pid of the java launcher thread.
3481 // So, on Bsd, the launcher thread pid is passed to the VM
3482 // via the sun.java.launcher.pid property.
3483 // Use this property instead of getpid() if it was correctly passed.
3484 // See bug 6351349.
3485 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid();
3486
3487 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid();
3488
3489 clock_tics_per_sec = CLK_TCK;
3490
3491 init_random(1234567);
3492
3493 Bsd::set_page_size(getpagesize());
3494 if (Bsd::page_size() == -1) {
3495 fatal("os_bsd.cpp: os::init: sysconf failed (%s)", os::strerror(errno));
3496 }
3497 init_page_sizes((size_t) Bsd::page_size());
3498
3499 Bsd::initialize_system_info();
3500
3501 // _main_thread points to the thread that created/loaded the JVM.
3502 Bsd::_main_thread = pthread_self();
3503
3504 Bsd::clock_init();
3505 initial_time_count = javaTimeNanos();
3506
3507 os::Posix::init();
3508 }
3509
3510 // To install functions for atexit system call
3511 extern "C" {
perfMemory_exit_helper()3512 static void perfMemory_exit_helper() {
3513 perfMemory_exit();
3514 }
3515 }
3516
3517 // this is called _after_ the global arguments have been parsed
init_2(void)3518 jint os::init_2(void) {
3519
3520 os::Posix::init_2();
3521
3522 // initialize suspend/resume support - must do this before signal_sets_init()
3523 if (SR_initialize() != 0) {
3524 perror("SR_initialize failed");
3525 return JNI_ERR;
3526 }
3527
3528 Bsd::signal_sets_init();
3529 Bsd::install_signal_handlers();
3530 // Initialize data for jdk.internal.misc.Signal
3531 if (!ReduceSignalUsage) {
3532 jdk_misc_signal_init();
3533 }
3534
3535 // Check and sets minimum stack sizes against command line options
3536 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
3537 return JNI_ERR;
3538 }
3539
3540 if (MaxFDLimit) {
3541 // set the number of file descriptors to max. print out error
3542 // if getrlimit/setrlimit fails but continue regardless.
3543 struct rlimit nbr_files;
3544 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3545 if (status != 0) {
3546 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
3547 } else {
3548 nbr_files.rlim_cur = nbr_files.rlim_max;
3549
3550 #ifdef __APPLE__
3551 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if
3552 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must
3553 // be used instead
3554 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur);
3555 #endif
3556
3557 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3558 if (status != 0) {
3559 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
3560 }
3561 }
3562 }
3563
3564 // at-exit methods are called in the reverse order of their registration.
3565 // atexit functions are called on return from main or as a result of a
3566 // call to exit(3C). There can be only 32 of these functions registered
3567 // and atexit() does not set errno.
3568
3569 if (PerfAllowAtExitRegistration) {
3570 // only register atexit functions if PerfAllowAtExitRegistration is set.
3571 // atexit functions can be delayed until process exit time, which
3572 // can be problematic for embedded VM situations. Embedded VMs should
3573 // call DestroyJavaVM() to assure that VM resources are released.
3574
3575 // note: perfMemory_exit_helper atexit function may be removed in
3576 // the future if the appropriate cleanup code can be added to the
3577 // VM_Exit VMOperation's doit method.
3578 if (atexit(perfMemory_exit_helper) != 0) {
3579 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3580 }
3581 }
3582
3583 // initialize thread priority policy
3584 prio_init();
3585
3586 #ifdef __APPLE__
3587 // dynamically link to objective c gc registration
3588 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY);
3589 if (handleLibObjc != NULL) {
3590 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER);
3591 }
3592 #endif
3593
3594 return JNI_OK;
3595 }
3596
3597 // Mark the polling page as unreadable
make_polling_page_unreadable(void)3598 void os::make_polling_page_unreadable(void) {
3599 if (!guard_memory((char*)_polling_page, Bsd::page_size())) {
3600 fatal("Could not disable polling page");
3601 }
3602 }
3603
3604 // Mark the polling page as readable
make_polling_page_readable(void)3605 void os::make_polling_page_readable(void) {
3606 if (!bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) {
3607 fatal("Could not enable polling page");
3608 }
3609 }
3610
active_processor_count()3611 int os::active_processor_count() {
3612 // User has overridden the number of active processors
3613 if (ActiveProcessorCount > 0) {
3614 log_trace(os)("active_processor_count: "
3615 "active processor count set by user : %d",
3616 ActiveProcessorCount);
3617 return ActiveProcessorCount;
3618 }
3619
3620 #ifdef __DragonFly__
3621 return sysconf(_SC_NPROCESSORS_ONLN);
3622 #endif
3623
3624 #ifdef __FreeBSD__
3625 int online_cpus = 0;
3626 cpuset_t mask;
3627 if (cpuset_getaffinity(CPU_LEVEL_WHICH, CPU_WHICH_PID, -1, sizeof(mask),
3628 &mask) == 0)
3629 for (u_int i = 0; i < sizeof(mask) / sizeof(long); i++)
3630 online_cpus += __builtin_popcountl(((long *)&mask)[i]);
3631 if (online_cpus > 0 && online_cpus <= _processor_count)
3632 return online_cpus;
3633 online_cpus = sysconf(_SC_NPROCESSORS_ONLN);
3634 if (online_cpus >= 1)
3635 return online_cpus;
3636 #endif
3637
3638 return _processor_count;
3639 }
3640
set_native_thread_name(const char * name)3641 void os::set_native_thread_name(const char *name) {
3642 if (name != NULL) {
3643 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5
3644 // This is only supported in Snow Leopard and beyond
3645 // Add a "Java: " prefix to the name
3646 char buf[MAXTHREADNAMESIZE];
3647 snprintf(buf, sizeof(buf), "Java: %s", name);
3648 pthread_setname_np(buf);
3649 #elif defined(__FreeBSD__) || defined(__OpenBSD__)
3650 pthread_set_name_np(pthread_self(), name);
3651 #elif defined(__NetBSD__)
3652 pthread_setname_np(pthread_self(), "%s", const_cast<char *>(name));
3653 #endif
3654 }
3655 }
3656
distribute_processes(uint length,uint * distribution)3657 bool os::distribute_processes(uint length, uint* distribution) {
3658 // Not yet implemented.
3659 return false;
3660 }
3661
bind_to_processor(uint processor_id)3662 bool os::bind_to_processor(uint processor_id) {
3663 // Not yet implemented.
3664 return false;
3665 }
3666
internal_do_task()3667 void os::SuspendedThreadTask::internal_do_task() {
3668 if (do_suspend(_thread->osthread())) {
3669 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3670 do_task(context);
3671 do_resume(_thread->osthread());
3672 }
3673 }
3674
3675 ////////////////////////////////////////////////////////////////////////////////
3676 // debug support
3677
find(address addr,outputStream * st)3678 bool os::find(address addr, outputStream* st) {
3679 Dl_info dlinfo;
3680 memset(&dlinfo, 0, sizeof(dlinfo));
3681 if (dladdr(addr, &dlinfo) != 0) {
3682 st->print(INTPTR_FORMAT ": ", (intptr_t)addr);
3683 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
3684 st->print("%s+%#x", dlinfo.dli_sname,
3685 (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_saddr));
3686 } else if (dlinfo.dli_fbase != NULL) {
3687 st->print("<offset %#x>", (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_fbase));
3688 } else {
3689 st->print("<absolute address>");
3690 }
3691 if (dlinfo.dli_fname != NULL) {
3692 st->print(" in %s", dlinfo.dli_fname);
3693 }
3694 if (dlinfo.dli_fbase != NULL) {
3695 st->print(" at " INTPTR_FORMAT, (intptr_t)dlinfo.dli_fbase);
3696 }
3697 st->cr();
3698
3699 if (Verbose) {
3700 // decode some bytes around the PC
3701 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
3702 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
3703 address lowest = (address) dlinfo.dli_sname;
3704 if (!lowest) lowest = (address) dlinfo.dli_fbase;
3705 if (begin < lowest) begin = lowest;
3706 Dl_info dlinfo2;
3707 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
3708 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) {
3709 end = (address) dlinfo2.dli_saddr;
3710 }
3711 Disassembler::decode(begin, end, st);
3712 }
3713 return true;
3714 }
3715 return false;
3716 }
3717
3718 ////////////////////////////////////////////////////////////////////////////////
3719 // misc
3720
3721 // This does not do anything on Bsd. This is basically a hook for being
3722 // able to use structured exception handling (thread-local exception filters)
3723 // on, e.g., Win32.
os_exception_wrapper(java_call_t f,JavaValue * value,const methodHandle & method,JavaCallArguments * args,Thread * thread)3724 void os::os_exception_wrapper(java_call_t f, JavaValue* value,
3725 const methodHandle& method, JavaCallArguments* args,
3726 Thread* thread) {
3727 f(value, method, args, thread);
3728 }
3729
print_statistics()3730 void os::print_statistics() {
3731 }
3732
message_box(const char * title,const char * message)3733 bool os::message_box(const char* title, const char* message) {
3734 int i;
3735 fdStream err(defaultStream::error_fd());
3736 for (i = 0; i < 78; i++) err.print_raw("=");
3737 err.cr();
3738 err.print_raw_cr(title);
3739 for (i = 0; i < 78; i++) err.print_raw("-");
3740 err.cr();
3741 err.print_raw_cr(message);
3742 for (i = 0; i < 78; i++) err.print_raw("=");
3743 err.cr();
3744
3745 char buf[16];
3746 // Prevent process from exiting upon "read error" without consuming all CPU
3747 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3748
3749 return buf[0] == 'y' || buf[0] == 'Y';
3750 }
3751
get_mtime(const char * filename)3752 static inline struct timespec get_mtime(const char* filename) {
3753 struct stat st;
3754 int ret = os::stat(filename, &st);
3755 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
3756 #ifdef __APPLE__
3757 return st.st_mtimespec;
3758 #else
3759 return st.st_mtim;
3760 #endif
3761 }
3762
compare_file_modified_times(const char * file1,const char * file2)3763 int os::compare_file_modified_times(const char* file1, const char* file2) {
3764 struct timespec filetime1 = get_mtime(file1);
3765 struct timespec filetime2 = get_mtime(file2);
3766 int diff = filetime1.tv_sec - filetime2.tv_sec;
3767 if (diff == 0) {
3768 return filetime1.tv_nsec - filetime2.tv_nsec;
3769 }
3770 return diff;
3771 }
3772
3773 // Is a (classpath) directory empty?
dir_is_empty(const char * path)3774 bool os::dir_is_empty(const char* path) {
3775 DIR *dir = NULL;
3776 struct dirent *ptr;
3777
3778 dir = opendir(path);
3779 if (dir == NULL) return true;
3780
3781 // Scan the directory
3782 bool result = true;
3783 while (result && (ptr = readdir(dir)) != NULL) {
3784 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3785 result = false;
3786 }
3787 }
3788 closedir(dir);
3789 return result;
3790 }
3791
3792 // This code originates from JDK's sysOpen and open64_w
3793 // from src/solaris/hpi/src/system_md.c
3794
open(const char * path,int oflag,int mode)3795 int os::open(const char *path, int oflag, int mode) {
3796 if (strlen(path) > MAX_PATH - 1) {
3797 errno = ENAMETOOLONG;
3798 return -1;
3799 }
3800 int fd;
3801
3802 fd = ::open(path, oflag, mode);
3803 if (fd == -1) return -1;
3804
3805 // If the open succeeded, the file might still be a directory
3806 {
3807 struct stat buf;
3808 int ret = ::fstat(fd, &buf);
3809 int st_mode = buf.st_mode;
3810
3811 if (ret != -1) {
3812 if ((st_mode & S_IFMT) == S_IFDIR) {
3813 errno = EISDIR;
3814 ::close(fd);
3815 return -1;
3816 }
3817 } else {
3818 ::close(fd);
3819 return -1;
3820 }
3821 }
3822
3823 // All file descriptors that are opened in the JVM and not
3824 // specifically destined for a subprocess should have the
3825 // close-on-exec flag set. If we don't set it, then careless 3rd
3826 // party native code might fork and exec without closing all
3827 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3828 // UNIXProcess.c), and this in turn might:
3829 //
3830 // - cause end-of-file to fail to be detected on some file
3831 // descriptors, resulting in mysterious hangs, or
3832 //
3833 // - might cause an fopen in the subprocess to fail on a system
3834 // suffering from bug 1085341.
3835 //
3836 // (Yes, the default setting of the close-on-exec flag is a Unix
3837 // design flaw)
3838 //
3839 // See:
3840 // 1085341: 32-bit stdio routines should support file descriptors >255
3841 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3842 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3843 //
3844 #ifdef FD_CLOEXEC
3845 {
3846 int flags = ::fcntl(fd, F_GETFD);
3847 if (flags != -1) {
3848 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3849 }
3850 }
3851 #endif
3852
3853 return fd;
3854 }
3855
3856
3857 // create binary file, rewriting existing file if required
create_binary_file(const char * path,bool rewrite_existing)3858 int os::create_binary_file(const char* path, bool rewrite_existing) {
3859 int oflags = O_WRONLY | O_CREAT;
3860 oflags |= rewrite_existing ? O_TRUNC : O_EXCL;
3861 return ::open(path, oflags, S_IREAD | S_IWRITE);
3862 }
3863
3864 // return current position of file pointer
current_file_offset(int fd)3865 jlong os::current_file_offset(int fd) {
3866 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR);
3867 }
3868
3869 // move file pointer to the specified offset
seek_to_file_offset(int fd,jlong offset)3870 jlong os::seek_to_file_offset(int fd, jlong offset) {
3871 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET);
3872 }
3873
3874 // This code originates from JDK's sysAvailable
3875 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3876
available(int fd,jlong * bytes)3877 int os::available(int fd, jlong *bytes) {
3878 jlong cur, end;
3879 int mode;
3880 struct stat buf;
3881
3882 if (::fstat(fd, &buf) >= 0) {
3883 mode = buf.st_mode;
3884 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3885 int n;
3886 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3887 *bytes = n;
3888 return 1;
3889 }
3890 }
3891 }
3892 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) {
3893 return 0;
3894 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) {
3895 return 0;
3896 } else if (::lseek(fd, cur, SEEK_SET) == -1) {
3897 return 0;
3898 }
3899 *bytes = end - cur;
3900 return 1;
3901 }
3902
3903 // 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)3904 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3905 char *addr, size_t bytes, bool read_only,
3906 bool allow_exec) {
3907 int prot;
3908 int flags;
3909
3910 if (read_only) {
3911 prot = PROT_READ;
3912 flags = MAP_SHARED;
3913 } else {
3914 prot = PROT_READ | PROT_WRITE;
3915 flags = MAP_PRIVATE;
3916 }
3917
3918 if (allow_exec) {
3919 prot |= PROT_EXEC;
3920 }
3921
3922 if (addr != NULL) {
3923 flags |= MAP_FIXED;
3924 }
3925
3926 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
3927 fd, file_offset);
3928 if (mapped_address == MAP_FAILED) {
3929 return NULL;
3930 }
3931 return mapped_address;
3932 }
3933
3934
3935 // 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)3936 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3937 char *addr, size_t bytes, bool read_only,
3938 bool allow_exec) {
3939 // same as map_memory() on this OS
3940 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3941 allow_exec);
3942 }
3943
3944
3945 // Unmap a block of memory.
pd_unmap_memory(char * addr,size_t bytes)3946 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3947 return munmap(addr, bytes) == 0;
3948 }
3949
3950 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3951 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3952 // of a thread.
3953 //
3954 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3955 // the fast estimate available on the platform.
3956
current_thread_cpu_time()3957 jlong os::current_thread_cpu_time() {
3958 return os::thread_cpu_time(Thread::current(), true /* user + sys */);
3959 }
3960
thread_cpu_time(Thread * thread)3961 jlong os::thread_cpu_time(Thread* thread) {
3962 return os::thread_cpu_time(thread, true /* user + sys */);
3963 }
3964
current_thread_cpu_time(bool user_sys_cpu_time)3965 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3966 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3967 }
3968
thread_cpu_time(Thread * thread,bool user_sys_cpu_time)3969 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
3970 #ifdef __APPLE__
3971 struct thread_basic_info tinfo;
3972 mach_msg_type_number_t tcount = THREAD_INFO_MAX;
3973 kern_return_t kr;
3974 thread_t mach_thread;
3975
3976 mach_thread = thread->osthread()->thread_id();
3977 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount);
3978 if (kr != KERN_SUCCESS) {
3979 return -1;
3980 }
3981
3982 if (user_sys_cpu_time) {
3983 jlong nanos;
3984 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000;
3985 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000;
3986 return nanos;
3987 } else {
3988 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000);
3989 }
3990 #else
3991 #if defined(__OpenBSD__)
3992 size_t length = 0;
3993 pid_t pid = getpid();
3994 struct kinfo_proc *ki;
3995
3996 int mib[] = { CTL_KERN, KERN_PROC, KERN_PROC_PID|KERN_PROC_SHOW_THREADS, pid, sizeof(struct kinfo_proc), 0 };
3997 const u_int miblen = sizeof(mib) / sizeof(mib[0]);
3998
3999 if (sysctl(mib, miblen, NULL, &length, NULL, 0) < 0) {
4000 return -1;
4001 }
4002
4003 size_t num_threads = length / sizeof(*ki);
4004 ki = NEW_C_HEAP_ARRAY(struct kinfo_proc, num_threads, mtInternal);
4005
4006 mib[5] = num_threads;
4007
4008 if (sysctl(mib, miblen, ki, &length, NULL, 0) < 0) {
4009 FREE_C_HEAP_ARRAY(struct kinfo_proc, ki);
4010 return -1;
4011 }
4012
4013 num_threads = length / sizeof(*ki);
4014
4015 for (size_t i = 0; i < num_threads; i++) {
4016 if (ki[i].p_tid == thread->osthread()->thread_id()) {
4017 jlong nanos = (jlong)ki[i].p_uutime_sec * NANOSECS_PER_SEC;
4018 nanos += (jlong)ki[i].p_uutime_usec * 1000;
4019 if (user_sys_cpu_time) {
4020 nanos += (jlong)ki[i].p_ustime_sec * NANOSECS_PER_SEC;
4021 nanos += (jlong)ki[i].p_ustime_usec * 1000;
4022 }
4023 FREE_C_HEAP_ARRAY(struct kinfo_proc, ki);
4024 return nanos;
4025 }
4026 }
4027 FREE_C_HEAP_ARRAY(struct kinfo_proc, ki);
4028 return -1;
4029 #else /* !OpenBSD */
4030 if (user_sys_cpu_time && Bsd::_getcpuclockid != NULL) {
4031 struct timespec tp;
4032 clockid_t clockid;
4033 int ret;
4034
4035 /*
4036 * XXX This is essentially a copy of the Linux implementation,
4037 * but with fewer indirections.
4038 */
4039 ret = Bsd::_getcpuclockid(thread->osthread()->pthread_id(), &clockid);
4040 if (ret != 0)
4041 return -1;
4042 /* NB: _clock_gettime only needs to be valid for CLOCK_MONOTONIC. */
4043 ret = ::clock_gettime(clockid, &tp);
4044 if (ret != 0)
4045 return -1;
4046 return (tp.tv_sec * NANOSECS_PER_SEC) + tp.tv_nsec;
4047 }
4048 #ifdef RUSAGE_THREAD
4049 if (thread == Thread::current()) {
4050 struct rusage usage;
4051 jlong nanos;
4052
4053 if (getrusage(RUSAGE_THREAD, &usage) != 0)
4054 return -1;
4055 nanos = (jlong)usage.ru_utime.tv_sec * NANOSECS_PER_SEC;
4056 nanos += (jlong)usage.ru_utime.tv_usec * 1000;
4057 if (user_sys_cpu_time) {
4058 nanos += (jlong)usage.ru_stime.tv_sec * NANOSECS_PER_SEC;
4059 nanos += (jlong)usage.ru_stime.tv_usec * 1000;
4060 }
4061 return nanos;
4062 }
4063 #endif
4064 return -1;
4065 #endif
4066 #endif
4067 }
4068
4069
current_thread_cpu_time_info(jvmtiTimerInfo * info_ptr)4070 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4071 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4072 info_ptr->may_skip_backward = false; // elapsed time not wall time
4073 info_ptr->may_skip_forward = false; // elapsed time not wall time
4074 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4075 }
4076
thread_cpu_time_info(jvmtiTimerInfo * info_ptr)4077 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4078 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4079 info_ptr->may_skip_backward = false; // elapsed time not wall time
4080 info_ptr->may_skip_forward = false; // elapsed time not wall time
4081 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4082 }
4083
is_thread_cpu_time_supported()4084 bool os::is_thread_cpu_time_supported() {
4085 #if defined(__APPLE__) || defined(__OpenBSD__)
4086 return true;
4087 #else
4088 return (Bsd::_getcpuclockid != NULL);
4089 #endif
4090 }
4091
4092 // System loadavg support. Returns -1 if load average cannot be obtained.
4093 // Bsd doesn't yet have a (official) notion of processor sets,
4094 // so just return the system wide load average.
loadavg(double loadavg[],int nelem)4095 int os::loadavg(double loadavg[], int nelem) {
4096 return ::getloadavg(loadavg, nelem);
4097 }
4098
pause()4099 void os::pause() {
4100 char filename[MAX_PATH];
4101 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4102 jio_snprintf(filename, MAX_PATH, "%s", PauseAtStartupFile);
4103 } else {
4104 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4105 }
4106
4107 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4108 if (fd != -1) {
4109 struct stat buf;
4110 ::close(fd);
4111 while (::stat(filename, &buf) == 0) {
4112 (void)::poll(NULL, 0, 100);
4113 }
4114 } else {
4115 jio_fprintf(stderr,
4116 "Could not open pause file '%s', continuing immediately.\n", filename);
4117 }
4118 }
4119
4120 // Darwin has no "environ" in a dynamic library.
4121 #ifdef __APPLE__
4122 #include <crt_externs.h>
4123 #define environ (*_NSGetEnviron())
4124 #else
4125 extern char** environ;
4126 #endif
4127
4128 // Run the specified command in a separate process. Return its exit value,
4129 // or -1 on failure (e.g. can't fork a new process).
4130 // Unlike system(), this function can be called from signal handler. It
4131 // doesn't block SIGINT et al.
fork_and_exec(char * cmd,bool use_vfork_if_available)4132 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
4133 const char * argv[4] = {"sh", "-c", cmd, NULL};
4134
4135 // fork() in BsdThreads/NPTL is not async-safe. It needs to run
4136 // pthread_atfork handlers and reset pthread library. All we need is a
4137 // separate process to execve. Make a direct syscall to fork process.
4138 // On IA64 there's no fork syscall, we have to use fork() and hope for
4139 // the best...
4140 pid_t pid = fork();
4141
4142 if (pid < 0) {
4143 // fork failed
4144 return -1;
4145
4146 } else if (pid == 0) {
4147 // child process
4148
4149 // execve() in BsdThreads will call pthread_kill_other_threads_np()
4150 // first to kill every thread on the thread list. Because this list is
4151 // not reset by fork() (see notes above), execve() will instead kill
4152 // every thread in the parent process. We know this is the only thread
4153 // in the new process, so make a system call directly.
4154 // IA64 should use normal execve() from glibc to match the glibc fork()
4155 // above.
4156 execve("/bin/sh", (char* const*)argv, environ);
4157
4158 // execve failed
4159 _exit(-1);
4160
4161 } else {
4162 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
4163 // care about the actual exit code, for now.
4164
4165 int status;
4166
4167 // Wait for the child process to exit. This returns immediately if
4168 // the child has already exited. */
4169 while (waitpid(pid, &status, 0) < 0) {
4170 switch (errno) {
4171 case ECHILD: return 0;
4172 case EINTR: break;
4173 default: return -1;
4174 }
4175 }
4176
4177 if (WIFEXITED(status)) {
4178 // The child exited normally; get its exit code.
4179 return WEXITSTATUS(status);
4180 } else if (WIFSIGNALED(status)) {
4181 // The child exited because of a signal
4182 // The best value to return is 0x80 + signal number,
4183 // because that is what all Unix shells do, and because
4184 // it allows callers to distinguish between process exit and
4185 // process death by signal.
4186 return 0x80 + WTERMSIG(status);
4187 } else {
4188 // Unknown exit code; pass it through
4189 return status;
4190 }
4191 }
4192 }
4193
4194 // Get the kern.corefile setting, or otherwise the default path to the core file
4195 // Returns the length of the string
get_core_path(char * buffer,size_t bufferSize)4196 int os::get_core_path(char* buffer, size_t bufferSize) {
4197 #ifdef __APPLE__
4198 int n = 0;
4199 char coreinfo[MAX_PATH];
4200 size_t sz = sizeof(coreinfo);
4201 int ret = sysctlbyname("kern.corefile", coreinfo, &sz, NULL, 0);
4202 if (ret == 0) {
4203 char *pid_pos = strstr(coreinfo, "%P");
4204 // skip over the "%P" to preserve any optional custom user pattern
4205 const char* tail = (pid_pos != NULL) ? (pid_pos + 2) : "";
4206
4207 if (pid_pos != NULL) {
4208 *pid_pos = '\0';
4209 n = jio_snprintf(buffer, bufferSize, "%s%d%s", coreinfo, os::current_process_id(), tail);
4210 } else {
4211 n = jio_snprintf(buffer, bufferSize, "%s", coreinfo);
4212 }
4213 } else
4214 {
4215 n = jio_snprintf(buffer, bufferSize, "/cores/core.%d", os::current_process_id());
4216 }
4217 // Truncate if theoretical string was longer than bufferSize
4218 n = MIN2(n, (int)bufferSize);
4219
4220 return n;
4221 #else
4222 const char *p = get_current_directory(buffer, bufferSize);
4223
4224 if (p == NULL) {
4225 assert(p != NULL, "failed to get current directory");
4226 return 0;
4227 }
4228
4229 const char *q = getprogname();
4230
4231 if (q == NULL) {
4232 assert(q != NULL, "failed to get progname");
4233 return 0;
4234 }
4235
4236 const int n = strlen(buffer);
4237
4238 jio_snprintf(buffer + n, bufferSize - n, "/%s.core", q);
4239 return strlen(buffer);
4240 #endif
4241 }
4242
4243 #ifndef PRODUCT
TestReserveMemorySpecial_test()4244 void TestReserveMemorySpecial_test() {
4245 // No tests available for this platform
4246 }
4247 #endif
4248
start_debugging(char * buf,int buflen)4249 bool os::start_debugging(char *buf, int buflen) {
4250 int len = (int)strlen(buf);
4251 char *p = &buf[len];
4252
4253 jio_snprintf(p, buflen-len,
4254 "\n\n"
4255 "Do you want to debug the problem?\n\n"
4256 "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " INTX_FORMAT " (" INTPTR_FORMAT ")\n"
4257 "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n"
4258 "Otherwise, press RETURN to abort...",
4259 os::current_process_id(), os::current_process_id(),
4260 os::current_thread_id(), os::current_thread_id());
4261
4262 bool yes = os::message_box("Unexpected Error", buf);
4263
4264 if (yes) {
4265 // yes, user asked VM to launch debugger
4266 jio_snprintf(buf, sizeof(buf), "gdb /proc/%d/exe %d",
4267 os::current_process_id(), os::current_process_id());
4268
4269 os::fork_and_exec(buf);
4270 yes = false;
4271 }
4272 return yes;
4273 }
4274
4275 // Java thread:
4276 //
4277 // Low memory addresses
4278 // +------------------------+
4279 // | |\ Java thread created by VM does not have
4280 // | pthread guard page | - pthread guard, attached Java thread usually
4281 // | |/ has 1 pthread guard page.
4282 // P1 +------------------------+ Thread::stack_base() - Thread::stack_size()
4283 // | |\
4284 // | HotSpot Guard Pages | - red, yellow and reserved pages
4285 // | |/
4286 // +------------------------+ JavaThread::stack_reserved_zone_base()
4287 // | |\
4288 // | Normal Stack | -
4289 // | |/
4290 // P2 +------------------------+ Thread::stack_base()
4291 //
4292 // Non-Java thread:
4293 //
4294 // Low memory addresses
4295 // +------------------------+
4296 // | |\
4297 // | pthread guard page | - usually 1 page
4298 // | |/
4299 // P1 +------------------------+ Thread::stack_base() - Thread::stack_size()
4300 // | |\
4301 // | Normal Stack | -
4302 // | |/
4303 // P2 +------------------------+ Thread::stack_base()
4304 //
4305 // ** P1 (aka bottom) and size ( P2 = P1 - size) are the address and stack size returned from
4306 // pthread_attr_getstack()
4307
current_stack_region(address * bottom,size_t * size)4308 static void current_stack_region(address * bottom, size_t * size) {
4309 #ifdef __APPLE__
4310 pthread_t self = pthread_self();
4311 void *stacktop = pthread_get_stackaddr_np(self);
4312 *size = pthread_get_stacksize_np(self);
4313 // workaround for OS X 10.9.0 (Mavericks)
4314 // pthread_get_stacksize_np returns 128 pages even though the actual size is 2048 pages
4315 if (pthread_main_np() == 1) {
4316 // At least on Mac OS 10.12 we have observed stack sizes not aligned
4317 // to pages boundaries. This can be provoked by e.g. setrlimit() (ulimit -s xxxx in the
4318 // shell). Apparently Mac OS actually rounds upwards to next multiple of page size,
4319 // however, we round downwards here to be on the safe side.
4320 *size = align_down(*size, getpagesize());
4321
4322 if ((*size) < (DEFAULT_MAIN_THREAD_STACK_PAGES * (size_t)getpagesize())) {
4323 char kern_osrelease[256];
4324 size_t kern_osrelease_size = sizeof(kern_osrelease);
4325 int ret = sysctlbyname("kern.osrelease", kern_osrelease, &kern_osrelease_size, NULL, 0);
4326 if (ret == 0) {
4327 // get the major number, atoi will ignore the minor amd micro portions of the version string
4328 if (atoi(kern_osrelease) >= OS_X_10_9_0_KERNEL_MAJOR_VERSION) {
4329 *size = (DEFAULT_MAIN_THREAD_STACK_PAGES*getpagesize());
4330 }
4331 }
4332 }
4333 }
4334 *bottom = (address) stacktop - *size;
4335 #elif defined(__OpenBSD__)
4336 stack_t ss;
4337 int rslt = pthread_stackseg_np(pthread_self(), &ss);
4338
4339 if (rslt != 0)
4340 fatal("pthread_stackseg_np failed with error = %d", rslt);
4341
4342 *bottom = (address)((char *)ss.ss_sp - ss.ss_size);
4343 *size = ss.ss_size;
4344 #else
4345 pthread_attr_t attr;
4346
4347 int rslt = pthread_attr_init(&attr);
4348
4349 // JVM needs to know exact stack location, abort if it fails
4350 if (rslt != 0)
4351 fatal("pthread_attr_init failed with error = %d", rslt);
4352
4353 rslt = pthread_attr_get_np(pthread_self(), &attr);
4354
4355 if (rslt != 0)
4356 fatal("pthread_attr_get_np failed with error = %d", rslt);
4357
4358 if (pthread_attr_getstack(&attr, (void **)bottom, size) != 0) {
4359 fatal("Can not locate current stack attributes!");
4360 }
4361
4362 pthread_attr_destroy(&attr);
4363 #endif
4364 assert(os::current_stack_pointer() >= *bottom &&
4365 os::current_stack_pointer() < *bottom + *size, "just checking");
4366 }
4367
current_stack_base()4368 address os::current_stack_base() {
4369 address bottom;
4370 size_t size;
4371 current_stack_region(&bottom, &size);
4372 return (bottom + size);
4373 }
4374
current_stack_size()4375 size_t os::current_stack_size() {
4376 // stack size includes normal stack and HotSpot guard pages
4377 address bottom;
4378 size_t size;
4379 current_stack_region(&bottom, &size);
4380 return size;
4381 }
4382