1 /* 2 * Copyright (c) 2003 Daniel M. Eischen <deischen@freebsd.org> 3 * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by John Birrell. 17 * 4. Neither the name of the author nor the names of any co-contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include "namespace.h" 35 #include <sys/param.h> 36 #include <sys/signalvar.h> 37 #include <sys/ioctl.h> 38 #include <sys/sysctl.h> 39 #include <sys/time.h> 40 #include <sys/types.h> 41 #include <sys/resource.h> 42 #include <sys/ttycom.h> 43 #include <sys/mman.h> 44 #include <stdio.h> 45 #include <fcntl.h> 46 #include <paths.h> 47 #include <pthread.h> 48 #include <signal.h> 49 #include <stdlib.h> 50 #include <string.h> 51 #include <unistd.h> 52 #include "un-namespace.h" 53 54 #include "libc_private.h" 55 #include "thr_private.h" 56 57 /* Default thread attributes: */ 58 struct __pthread_attr_s _pthread_attr_default = { 59 .sched_policy = SCHED_OTHER, 60 .sched_inherit = 0, 61 .prio = THR_DEFAULT_PRIORITY, 62 .suspend = THR_CREATE_RUNNING, 63 .flags = PTHREAD_SCOPE_SYSTEM, 64 .stackaddr_attr = NULL, 65 .stacksize_attr = THR_STACK_DEFAULT, 66 .guardsize_attr = 0 67 }; 68 69 /* Default mutex attributes: */ 70 struct __pthread_mutexattr_s _pthread_mutexattr_default = { 71 .m_type = PTHREAD_MUTEX_DEFAULT, 72 .m_protocol = PTHREAD_PRIO_NONE, 73 .m_ceiling = 0, 74 .m_flags = 0 75 }; 76 77 /* Default condition variable attributes: */ 78 struct __pthread_condattr_s _pthread_condattr_default = { 79 .c_pshared = PTHREAD_PROCESS_PRIVATE, 80 .c_clockid = CLOCK_REALTIME 81 }; 82 83 /* thr_attr.c */ 84 STATIC_LIB_REQUIRE(_pthread_attr_init); 85 /* thr_barrier.c */ 86 STATIC_LIB_REQUIRE(_pthread_barrier_init); 87 /* thr_barrierattr.c */ 88 STATIC_LIB_REQUIRE(_pthread_barrierattr_init); 89 /* thr_cancel.c */ 90 STATIC_LIB_REQUIRE(_pthread_cancel); 91 /* thr_clean.c */ 92 STATIC_LIB_REQUIRE(_pthread_cleanup_push); 93 /* thr_concurrency.c */ 94 STATIC_LIB_REQUIRE(_pthread_getconcurrency); 95 STATIC_LIB_REQUIRE(_pthread_setconcurrency); 96 /* thr_cond.c */ 97 STATIC_LIB_REQUIRE(_pthread_cond_init); 98 /* thr_condattr.c */ 99 STATIC_LIB_REQUIRE(_pthread_condattr_init); 100 /* thr_create.c */ 101 STATIC_LIB_REQUIRE(_pthread_create); 102 /* thr_detach.c */ 103 STATIC_LIB_REQUIRE(_pthread_detach); 104 /* thr_equal.c */ 105 STATIC_LIB_REQUIRE(_pthread_equal); 106 /* thr_exit.c */ 107 STATIC_LIB_REQUIRE(_pthread_exit); 108 /* thr_fork.c */ 109 STATIC_LIB_REQUIRE(_pthread_atfork); 110 STATIC_LIB_REQUIRE(_fork); 111 /* thr_affinity.c */ 112 STATIC_LIB_REQUIRE(_pthread_getaffinity_np); 113 /* thr_getcpuclockid.c */ 114 STATIC_LIB_REQUIRE(_pthread_getcpuclockid); 115 /* thr_getprio.c */ 116 STATIC_LIB_REQUIRE(_pthread_getprio); 117 /* thr_getschedparam.c */ 118 STATIC_LIB_REQUIRE(_pthread_getschedparam); 119 /* thr_getthreadid_np.c */ 120 STATIC_LIB_REQUIRE(_pthread_getthreadid_np); 121 /* thr_info.c */ 122 STATIC_LIB_REQUIRE(_pthread_get_name_np); 123 /* thr_info.c */ 124 STATIC_LIB_REQUIRE(_pthread_set_name_np); 125 /* thr_init.c */ 126 STATIC_LIB_REQUIRE(_pthread_init_early); 127 /* thr_join.c */ 128 STATIC_LIB_REQUIRE(_pthread_join); 129 /* thr_kill.c */ 130 STATIC_LIB_REQUIRE(_pthread_kill); 131 /* thr_main_np.c */ 132 STATIC_LIB_REQUIRE(_pthread_main_np); 133 /* thr_multi_np.c */ 134 STATIC_LIB_REQUIRE(_pthread_multi_np); 135 /* thr_mutex.c */ 136 STATIC_LIB_REQUIRE(_pthread_mutex_init); 137 /* thr_mutex_prioceiling.c */ 138 STATIC_LIB_REQUIRE(_pthread_mutexattr_getprioceiling); 139 /* thr_mutex_protocol.c */ 140 STATIC_LIB_REQUIRE(_pthread_mutexattr_getprotocol); 141 /* thr_mutexattr.c */ 142 STATIC_LIB_REQUIRE(_pthread_mutexattr_init); 143 /* thr_once.c */ 144 STATIC_LIB_REQUIRE(_pthread_once); 145 /* thr_pspinlock.c */ 146 STATIC_LIB_REQUIRE(_pthread_spin_init); 147 /* thr_resume_np.c */ 148 STATIC_LIB_REQUIRE(_pthread_resume_np); 149 /* thr_rwlock.c */ 150 STATIC_LIB_REQUIRE(_pthread_rwlock_init); 151 /* thr_rwlockattr.c */ 152 STATIC_LIB_REQUIRE(_pthread_rwlockattr_init); 153 /* thr_self.c */ 154 STATIC_LIB_REQUIRE(_pthread_self); 155 /* thr_sem.c */ 156 STATIC_LIB_REQUIRE(_sem_init); 157 /* thr_affinity.c */ 158 STATIC_LIB_REQUIRE(_pthread_setaffinity_np); 159 /* thr_setprio.c */ 160 STATIC_LIB_REQUIRE(_pthread_setprio); 161 /* thr_setschedparam.c */ 162 STATIC_LIB_REQUIRE(_pthread_setschedparam); 163 /* thr_sig.c */ 164 STATIC_LIB_REQUIRE(_sigwait); 165 /* thr_single_np.c */ 166 STATIC_LIB_REQUIRE(_pthread_single_np); 167 /* thr_spec.c */ 168 STATIC_LIB_REQUIRE(_pthread_key_create); 169 /* thr_spinlock.c */ 170 STATIC_LIB_REQUIRE(_spinlock); 171 /* thr_suspend_np.c */ 172 STATIC_LIB_REQUIRE(_pthread_suspend_np); 173 /* thr_switch_np.c */ 174 STATIC_LIB_REQUIRE(_pthread_switch_add_np); 175 /* thr_symbols.c */ 176 STATIC_LIB_REQUIRE(_thread_state_running); 177 /* thr_syscalls.c */ 178 STATIC_LIB_REQUIRE(__wait4); 179 /* thr_yield.c */ 180 STATIC_LIB_REQUIRE(_pthread_yield); 181 182 char *_usrstack; 183 pthread_t _thr_initial; 184 static void *_thr_main_redzone; 185 186 pid_t _thr_pid; 187 size_t _thr_guard_default; 188 size_t _thr_stack_default = THR_STACK_DEFAULT; 189 size_t _thr_stack_initial = THR_STACK_INITIAL; 190 int _thr_page_size; 191 192 static void init_private(void); 193 static void _libpthread_uninit(void); 194 static void init_main_thread(pthread_t thread); 195 196 void _thread_init(void) __attribute__ ((constructor)); 197 void 198 _thread_init(void) 199 { 200 _libpthread_init(NULL); 201 _libc_thr_init(); 202 } 203 204 void _thread_uninit(void) __attribute__ ((destructor)); 205 void 206 _thread_uninit(void) 207 { 208 _libpthread_uninit(); 209 } 210 211 /* 212 * This function is used by libc to initialise libpthread 213 * early during dynamic linking. 214 */ 215 void _pthread_init_early(void); 216 void 217 _pthread_init_early(void) 218 { 219 _libpthread_init(NULL); 220 } 221 222 /* 223 * Threaded process initialization. 224 * 225 * This is only called under two conditions: 226 * 227 * 1) Some thread routines have detected that the library hasn't yet 228 * been initialized (_thr_initial == NULL && curthread == NULL), or 229 * 230 * 2) An explicit call to reinitialize after a fork (indicated 231 * by curthread != NULL) 232 */ 233 void 234 _libpthread_init(pthread_t curthread) 235 { 236 int fd, first = 0; 237 sigset_t sigset, oldset; 238 239 /* Check if this function has already been called: */ 240 if ((_thr_initial != NULL) && (curthread == NULL)) 241 /* Only initialize the threaded application once. */ 242 return; 243 244 /* 245 * Check for the special case of this process running as 246 * or in place of init as pid = 1: 247 */ 248 if ((_thr_pid = getpid()) == 1) { 249 /* 250 * Setup a new session for this process which is 251 * assumed to be running as root. 252 */ 253 if (setsid() == -1) 254 PANIC("Can't set session ID"); 255 if (revoke(_PATH_CONSOLE) != 0) 256 PANIC("Can't revoke console"); 257 if ((fd = __sys_open(_PATH_CONSOLE, O_RDWR)) < 0) 258 PANIC("Can't open console"); 259 if (setlogin("root") == -1) 260 PANIC("Can't set login to root"); 261 if (__sys_ioctl(fd, TIOCSCTTY, NULL) == -1) 262 PANIC("Can't set controlling terminal"); 263 } 264 265 /* Initialize pthread private data. */ 266 init_private(); 267 268 /* Set the initial thread. */ 269 if (curthread == NULL) { 270 first = 1; 271 /* Create and initialize the initial thread. */ 272 curthread = _thr_alloc(NULL); 273 if (curthread == NULL) 274 PANIC("Can't allocate initial thread"); 275 init_main_thread(curthread); 276 } 277 /* 278 * Add the thread to the thread list queue. 279 */ 280 THR_LIST_ADD(curthread); 281 _thread_active_threads = 1; 282 283 /* Setup the thread specific data */ 284 tls_set_tcb(curthread->tcb); 285 286 if (first) { 287 SIGFILLSET(sigset); 288 __sys_sigprocmask(SIG_SETMASK, &sigset, &oldset); 289 _thr_signal_init(); 290 _thr_initial = curthread; 291 SIGDELSET(oldset, SIGCANCEL); 292 __sys_sigprocmask(SIG_SETMASK, &oldset, NULL); 293 if (td_eventismember(&_thread_event_mask, TD_CREATE)) 294 _thr_report_creation(curthread, curthread); 295 _thr_rtld_init(); 296 _thr_malloc_init(); 297 _thr_sem_init(); 298 } 299 } 300 301 static void 302 _libpthread_uninit(void) 303 { 304 if (_thr_initial == NULL) 305 return; 306 if (_thr_main_redzone && _thr_main_redzone != MAP_FAILED) { 307 munmap(_thr_main_redzone, _thr_guard_default); 308 _thr_main_redzone = NULL; 309 } 310 _thr_stack_cleanup(); 311 } 312 313 /* 314 * This function and pthread_create() do a lot of the same things. 315 * It'd be nice to consolidate the common stuff in one place. 316 */ 317 static void 318 init_main_thread(pthread_t thread) 319 { 320 /* Setup the thread attributes. */ 321 thread->tid = _thr_get_tid(); 322 thread->attr = _pthread_attr_default; 323 /* 324 * Set up the thread stack. 325 * 326 * Create a red zone below the main stack. All other stacks 327 * are constrained to a maximum size by the parameters 328 * passed to mmap(), but this stack is only limited by 329 * resource limits, so this stack needs an explicitly mapped 330 * red zone to protect the thread stack that is just beyond. 331 */ 332 _thr_main_redzone = mmap(_usrstack - _thr_stack_initial - 333 _thr_guard_default, _thr_guard_default, 334 0, MAP_ANON | MAP_TRYFIXED, -1, 0); 335 if (_thr_main_redzone == MAP_FAILED) { 336 PANIC("Cannot allocate red zone for initial thread"); 337 } 338 339 /* 340 * Mark the stack as an application supplied stack so that it 341 * isn't deallocated. 342 * 343 * XXX - I'm not sure it would hurt anything to deallocate 344 * the main thread stack because deallocation doesn't 345 * actually free() it; it just puts it in the free 346 * stack queue for later reuse. 347 */ 348 thread->attr.stackaddr_attr = _usrstack - _thr_stack_initial; 349 thread->attr.stacksize_attr = _thr_stack_initial; 350 thread->attr.guardsize_attr = _thr_guard_default; 351 thread->attr.flags |= THR_STACK_USER; 352 353 /* 354 * Write a magic value to the thread structure 355 * to help identify valid ones: 356 */ 357 thread->magic = THR_MAGIC; 358 359 thread->cancelflags = PTHREAD_CANCEL_ENABLE | PTHREAD_CANCEL_DEFERRED; 360 thread->name = __malloc(16); 361 snprintf(thread->name, 16, "initial thread"); 362 363 /* Default the priority of the initial thread: */ 364 thread->base_priority = THR_DEFAULT_PRIORITY; 365 thread->active_priority = THR_DEFAULT_PRIORITY; 366 thread->inherited_priority = 0; 367 368 /* Initialize the mutex queue: */ 369 TAILQ_INIT(&thread->mutexq); 370 371 thread->state = PS_RUNNING; 372 thread->uniqueid = 0; 373 374 /* Others cleared to zero by thr_alloc() */ 375 } 376 377 /* 378 * Determine the size of the main thread. 379 * 380 * Set the main thread's stack size equal to the value of RLIMIT_STACK for the 381 * process. The size of stacks for threads created by the process at run-time 382 * with pthread_create(3) is not affected by this and is still controlled by 383 * thread attributes. 384 * 385 * Note: FreeBSD uses environment variables LIBPTHREAD_BIGSTACK_MAIN and 386 * LIBPTHREAD_SPLITSTACK_MAIN to control use of RLIMIT_STACK vs the hard-coded 387 * 4MB with RLIMIT_STACK being the default behaviour. DragonFly instead respects 388 * RLIMIT_STACK unconditionally. 389 */ 390 static int64_t 391 get_mainthread_size(void) 392 { 393 struct rlimit rlim; 394 395 if (getrlimit(RLIMIT_STACK, &rlim) == -1) 396 PANIC("Cannot get stack rlimit"); 397 398 return rlim.rlim_cur; 399 } 400 401 static void 402 init_private(void) 403 { 404 static int init_once = 0; 405 size_t len; 406 int mib[2]; 407 408 /* 409 * Avoid reinitializing some things if they don't need to be, 410 * e.g. after a fork(). 411 * 412 * NOTE: _thr_atfork_*list must remain intact after a fork. 413 */ 414 if (init_once == 0) { 415 /* Find the stack top */ 416 mib[0] = CTL_KERN; 417 mib[1] = KERN_USRSTACK; 418 len = sizeof (_usrstack); 419 if (sysctl(mib, 2, &_usrstack, &len, NULL, 0) == -1) 420 PANIC("Cannot get kern.usrstack from sysctl"); 421 _thr_stack_initial = get_mainthread_size(); 422 _thr_page_size = getpagesize(); 423 _thr_guard_default = _thr_page_size; 424 _pthread_attr_default.guardsize_attr = _thr_guard_default; 425 TAILQ_INIT(&_thr_atfork_list); 426 TAILQ_INIT(&_thr_atfork_kern_list); 427 init_once = 1; 428 } 429 430 _thr_umtx_init(&_mutex_static_lock); 431 _thr_umtx_init(&_cond_static_lock); 432 _thr_umtx_init(&_rwlock_static_lock); 433 _thr_umtx_init(&_keytable_lock); 434 _thr_umtx_init(&_thr_atfork_lock); 435 _thr_umtx_init(&_thr_event_lock); 436 _thr_spinlock_init(); 437 _thr_list_init(); 438 } 439 440 __strong_reference(_pthread_init_early, pthread_init_early); 441