1 /*- 2 * SPDX-License-Identifier: BSD-4-Clause 3 * 4 * Copyright (c) 2003 Daniel M. Eischen <deischen@freebsd.org> 5 * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by John Birrell. 19 * 4. Neither the name of the author nor the names of any co-contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 #include "namespace.h" 40 #include <sys/param.h> 41 #include <sys/auxv.h> 42 #include <sys/signalvar.h> 43 #include <sys/ioctl.h> 44 #include <sys/link_elf.h> 45 #include <sys/resource.h> 46 #include <sys/sysctl.h> 47 #include <sys/ttycom.h> 48 #include <sys/mman.h> 49 #include <sys/rtprio.h> 50 #include <errno.h> 51 #include <fcntl.h> 52 #include <paths.h> 53 #include <pthread.h> 54 #include <pthread_np.h> 55 #include <signal.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <time.h> 59 #include <unistd.h> 60 #include "un-namespace.h" 61 62 #include "libc_private.h" 63 #include "thr_private.h" 64 65 char *_usrstack; 66 struct pthread *_thr_initial; 67 int _libthr_debug; 68 int _thread_event_mask; 69 struct pthread *_thread_last_event; 70 pthreadlist _thread_list = TAILQ_HEAD_INITIALIZER(_thread_list); 71 pthreadlist _thread_gc_list = TAILQ_HEAD_INITIALIZER(_thread_gc_list); 72 int _thread_active_threads = 1; 73 atfork_head _thr_atfork_list = TAILQ_HEAD_INITIALIZER(_thr_atfork_list); 74 struct urwlock _thr_atfork_lock = DEFAULT_URWLOCK; 75 76 struct pthread_prio _thr_priorities[3] = { 77 {RTP_PRIO_MIN, RTP_PRIO_MAX, 0}, /* FIFO */ 78 {0, 0, 63}, /* OTHER */ 79 {RTP_PRIO_MIN, RTP_PRIO_MAX, 0} /* RR */ 80 }; 81 82 struct pthread_attr _pthread_attr_default = { 83 .sched_policy = SCHED_OTHER, 84 .sched_inherit = PTHREAD_INHERIT_SCHED, 85 .prio = 0, 86 .suspend = THR_CREATE_RUNNING, 87 .flags = PTHREAD_SCOPE_SYSTEM, 88 .stackaddr_attr = NULL, 89 .stacksize_attr = THR_STACK_DEFAULT, 90 .guardsize_attr = 0, 91 .cpusetsize = 0, 92 .cpuset = NULL 93 }; 94 95 struct pthread_mutex_attr _pthread_mutexattr_default = { 96 .m_type = PTHREAD_MUTEX_DEFAULT, 97 .m_protocol = PTHREAD_PRIO_NONE, 98 .m_ceiling = 0, 99 .m_pshared = PTHREAD_PROCESS_PRIVATE, 100 .m_robust = PTHREAD_MUTEX_STALLED, 101 }; 102 103 struct pthread_mutex_attr _pthread_mutexattr_adaptive_default = { 104 .m_type = PTHREAD_MUTEX_ADAPTIVE_NP, 105 .m_protocol = PTHREAD_PRIO_NONE, 106 .m_ceiling = 0, 107 .m_pshared = PTHREAD_PROCESS_PRIVATE, 108 .m_robust = PTHREAD_MUTEX_STALLED, 109 }; 110 111 /* Default condition variable attributes: */ 112 struct pthread_cond_attr _pthread_condattr_default = { 113 .c_pshared = PTHREAD_PROCESS_PRIVATE, 114 .c_clockid = CLOCK_REALTIME 115 }; 116 117 int _thr_is_smp = 0; 118 size_t _thr_guard_default; 119 size_t _thr_stack_default = THR_STACK_DEFAULT; 120 size_t _thr_stack_initial = THR_STACK_INITIAL; 121 int _thr_page_size; 122 int _thr_spinloops; 123 int _thr_yieldloops; 124 int _thr_queuefifo = 4; 125 int _gc_count; 126 struct umutex _mutex_static_lock = DEFAULT_UMUTEX; 127 struct umutex _cond_static_lock = DEFAULT_UMUTEX; 128 struct umutex _rwlock_static_lock = DEFAULT_UMUTEX; 129 struct umutex _keytable_lock = DEFAULT_UMUTEX; 130 struct urwlock _thr_list_lock = DEFAULT_URWLOCK; 131 struct umutex _thr_event_lock = DEFAULT_UMUTEX; 132 struct umutex _suspend_all_lock = DEFAULT_UMUTEX; 133 struct pthread *_single_thread; 134 int _suspend_all_cycle; 135 int _suspend_all_waiters; 136 137 int __pthread_cond_wait(pthread_cond_t *, pthread_mutex_t *); 138 int __pthread_mutex_lock(pthread_mutex_t *); 139 int __pthread_mutex_trylock(pthread_mutex_t *); 140 void _thread_init_hack(void) __attribute__ ((constructor)); 141 142 static void init_private(void); 143 static void init_main_thread(struct pthread *thread); 144 145 /* 146 * All weak references used within libc should be in this table. 147 * This is so that static libraries will work. 148 */ 149 150 STATIC_LIB_REQUIRE(_fork); 151 STATIC_LIB_REQUIRE(_pthread_getspecific); 152 STATIC_LIB_REQUIRE(_pthread_key_create); 153 STATIC_LIB_REQUIRE(_pthread_key_delete); 154 STATIC_LIB_REQUIRE(_pthread_mutex_destroy); 155 STATIC_LIB_REQUIRE(_pthread_mutex_init); 156 STATIC_LIB_REQUIRE(_pthread_mutex_lock); 157 STATIC_LIB_REQUIRE(_pthread_mutex_trylock); 158 STATIC_LIB_REQUIRE(_pthread_mutex_unlock); 159 STATIC_LIB_REQUIRE(_pthread_mutexattr_init); 160 STATIC_LIB_REQUIRE(_pthread_mutexattr_destroy); 161 STATIC_LIB_REQUIRE(_pthread_mutexattr_settype); 162 STATIC_LIB_REQUIRE(_pthread_once); 163 STATIC_LIB_REQUIRE(_pthread_setspecific); 164 STATIC_LIB_REQUIRE(_raise); 165 STATIC_LIB_REQUIRE(_sem_destroy); 166 STATIC_LIB_REQUIRE(_sem_getvalue); 167 STATIC_LIB_REQUIRE(_sem_init); 168 STATIC_LIB_REQUIRE(_sem_post); 169 STATIC_LIB_REQUIRE(_sem_timedwait); 170 STATIC_LIB_REQUIRE(_sem_trywait); 171 STATIC_LIB_REQUIRE(_sem_wait); 172 STATIC_LIB_REQUIRE(_sigaction); 173 STATIC_LIB_REQUIRE(_sigprocmask); 174 STATIC_LIB_REQUIRE(_sigsuspend); 175 STATIC_LIB_REQUIRE(_sigtimedwait); 176 STATIC_LIB_REQUIRE(_sigwait); 177 STATIC_LIB_REQUIRE(_sigwaitinfo); 178 STATIC_LIB_REQUIRE(_spinlock); 179 STATIC_LIB_REQUIRE(_spinunlock); 180 STATIC_LIB_REQUIRE(_thread_init_hack); 181 182 /* 183 * These are needed when linking statically. All references within 184 * libgcc (and in the future libc) to these routines are weak, but 185 * if they are not (strongly) referenced by the application or other 186 * libraries, then the actual functions will not be loaded. 187 */ 188 STATIC_LIB_REQUIRE(_pthread_once); 189 STATIC_LIB_REQUIRE(_pthread_key_create); 190 STATIC_LIB_REQUIRE(_pthread_key_delete); 191 STATIC_LIB_REQUIRE(_pthread_getspecific); 192 STATIC_LIB_REQUIRE(_pthread_setspecific); 193 STATIC_LIB_REQUIRE(_pthread_mutex_init); 194 STATIC_LIB_REQUIRE(_pthread_mutex_destroy); 195 STATIC_LIB_REQUIRE(_pthread_mutex_lock); 196 STATIC_LIB_REQUIRE(_pthread_mutex_trylock); 197 STATIC_LIB_REQUIRE(_pthread_mutex_unlock); 198 STATIC_LIB_REQUIRE(_pthread_create); 199 200 /* Pull in all symbols required by libthread_db */ 201 STATIC_LIB_REQUIRE(_thread_state_running); 202 203 #define DUAL_ENTRY(entry) \ 204 (pthread_func_t)entry, (pthread_func_t)entry 205 206 static pthread_func_t jmp_table[][2] = { 207 [PJT_ATFORK] = {DUAL_ENTRY(_thr_atfork)}, 208 [PJT_ATTR_DESTROY] = {DUAL_ENTRY(_thr_attr_destroy)}, 209 [PJT_ATTR_GETDETACHSTATE] = {DUAL_ENTRY(_thr_attr_getdetachstate)}, 210 [PJT_ATTR_GETGUARDSIZE] = {DUAL_ENTRY(_thr_attr_getguardsize)}, 211 [PJT_ATTR_GETINHERITSCHED] = {DUAL_ENTRY(_thr_attr_getinheritsched)}, 212 [PJT_ATTR_GETSCHEDPARAM] = {DUAL_ENTRY(_thr_attr_getschedparam)}, 213 [PJT_ATTR_GETSCHEDPOLICY] = {DUAL_ENTRY(_thr_attr_getschedpolicy)}, 214 [PJT_ATTR_GETSCOPE] = {DUAL_ENTRY(_thr_attr_getscope)}, 215 [PJT_ATTR_GETSTACKADDR] = {DUAL_ENTRY(_thr_attr_getstackaddr)}, 216 [PJT_ATTR_GETSTACKSIZE] = {DUAL_ENTRY(_thr_attr_getstacksize)}, 217 [PJT_ATTR_INIT] = {DUAL_ENTRY(_thr_attr_init)}, 218 [PJT_ATTR_SETDETACHSTATE] = {DUAL_ENTRY(_thr_attr_setdetachstate)}, 219 [PJT_ATTR_SETGUARDSIZE] = {DUAL_ENTRY(_thr_attr_setguardsize)}, 220 [PJT_ATTR_SETINHERITSCHED] = {DUAL_ENTRY(_thr_attr_setinheritsched)}, 221 [PJT_ATTR_SETSCHEDPARAM] = {DUAL_ENTRY(_thr_attr_setschedparam)}, 222 [PJT_ATTR_SETSCHEDPOLICY] = {DUAL_ENTRY(_thr_attr_setschedpolicy)}, 223 [PJT_ATTR_SETSCOPE] = {DUAL_ENTRY(_thr_attr_setscope)}, 224 [PJT_ATTR_SETSTACKADDR] = {DUAL_ENTRY(_thr_attr_setstackaddr)}, 225 [PJT_ATTR_SETSTACKSIZE] = {DUAL_ENTRY(_thr_attr_setstacksize)}, 226 [PJT_CANCEL] = {DUAL_ENTRY(_thr_cancel)}, 227 [PJT_CLEANUP_POP] = {DUAL_ENTRY(_thr_cleanup_pop)}, 228 [PJT_CLEANUP_PUSH] = {DUAL_ENTRY(_thr_cleanup_push)}, 229 [PJT_COND_BROADCAST] = {DUAL_ENTRY(_thr_cond_broadcast)}, 230 [PJT_COND_DESTROY] = {DUAL_ENTRY(_thr_cond_destroy)}, 231 [PJT_COND_INIT] = {DUAL_ENTRY(_thr_cond_init)}, 232 [PJT_COND_SIGNAL] = {DUAL_ENTRY(_thr_cond_signal)}, 233 [PJT_COND_TIMEDWAIT] = {DUAL_ENTRY(_thr_cond_timedwait)}, 234 [PJT_COND_WAIT] = {(pthread_func_t)__thr_cond_wait, 235 (pthread_func_t)_thr_cond_wait}, 236 [PJT_DETACH] = {DUAL_ENTRY(_thr_detach)}, 237 [PJT_EQUAL] = {DUAL_ENTRY(_thr_equal)}, 238 [PJT_EXIT] = {DUAL_ENTRY(_Tthr_exit)}, 239 [PJT_GETSPECIFIC] = {DUAL_ENTRY(_thr_getspecific)}, 240 [PJT_JOIN] = {DUAL_ENTRY(_thr_join)}, 241 [PJT_KEY_CREATE] = {DUAL_ENTRY(_thr_key_create)}, 242 [PJT_KEY_DELETE] = {DUAL_ENTRY(_thr_key_delete)}, 243 [PJT_KILL] = {DUAL_ENTRY(_Tthr_kill)}, 244 [PJT_MAIN_NP] = {DUAL_ENTRY(_thr_main_np)}, 245 [PJT_MUTEXATTR_DESTROY] = {DUAL_ENTRY(_thr_mutexattr_destroy)}, 246 [PJT_MUTEXATTR_INIT] = {DUAL_ENTRY(_thr_mutexattr_init)}, 247 [PJT_MUTEXATTR_SETTYPE] = {DUAL_ENTRY(_thr_mutexattr_settype)}, 248 [PJT_MUTEX_DESTROY] = {DUAL_ENTRY(_thr_mutex_destroy)}, 249 [PJT_MUTEX_INIT] = {DUAL_ENTRY(__Tthr_mutex_init)}, 250 [PJT_MUTEX_LOCK] = {DUAL_ENTRY(__Tthr_mutex_lock)}, 251 [PJT_MUTEX_TRYLOCK] = {DUAL_ENTRY(__Tthr_mutex_trylock)}, 252 [PJT_MUTEX_UNLOCK] = {DUAL_ENTRY(_thr_mutex_unlock)}, 253 [PJT_ONCE] = {DUAL_ENTRY(_thr_once)}, 254 [PJT_RWLOCK_DESTROY] = {DUAL_ENTRY(_thr_rwlock_destroy)}, 255 [PJT_RWLOCK_INIT] = {DUAL_ENTRY(_thr_rwlock_init)}, 256 [PJT_RWLOCK_RDLOCK] = {DUAL_ENTRY(_Tthr_rwlock_rdlock)}, 257 [PJT_RWLOCK_TRYRDLOCK] = {DUAL_ENTRY(_Tthr_rwlock_tryrdlock)}, 258 [PJT_RWLOCK_TRYWRLOCK] = {DUAL_ENTRY(_Tthr_rwlock_trywrlock)}, 259 [PJT_RWLOCK_UNLOCK] = {DUAL_ENTRY(_Tthr_rwlock_unlock)}, 260 [PJT_RWLOCK_WRLOCK] = {DUAL_ENTRY(_Tthr_rwlock_wrlock)}, 261 [PJT_SELF] = {DUAL_ENTRY(_Tthr_self)}, 262 [PJT_SETCANCELSTATE] = {DUAL_ENTRY(_thr_setcancelstate)}, 263 [PJT_SETCANCELTYPE] = {DUAL_ENTRY(_thr_setcanceltype)}, 264 [PJT_SETSPECIFIC] = {DUAL_ENTRY(_thr_setspecific)}, 265 [PJT_SIGMASK] = {DUAL_ENTRY(_thr_sigmask)}, 266 [PJT_TESTCANCEL] = {DUAL_ENTRY(_Tthr_testcancel)}, 267 [PJT_CLEANUP_POP_IMP] = {DUAL_ENTRY(__thr_cleanup_pop_imp)}, 268 [PJT_CLEANUP_PUSH_IMP] = {DUAL_ENTRY(__thr_cleanup_push_imp)}, 269 [PJT_CANCEL_ENTER] = {DUAL_ENTRY(_Tthr_cancel_enter)}, 270 [PJT_CANCEL_LEAVE] = {DUAL_ENTRY(_Tthr_cancel_leave)}, 271 [PJT_MUTEX_CONSISTENT] = {DUAL_ENTRY(_Tthr_mutex_consistent)}, 272 [PJT_MUTEXATTR_GETROBUST] = {DUAL_ENTRY(_thr_mutexattr_getrobust)}, 273 [PJT_MUTEXATTR_SETROBUST] = {DUAL_ENTRY(_thr_mutexattr_setrobust)}, 274 [PJT_GETTHREADID_NP] = {DUAL_ENTRY(_thr_getthreadid_np)}, 275 [PJT_ATTR_GET_NP] = {DUAL_ENTRY(_thr_attr_get_np)}, 276 }; 277 278 static int init_once = 0; 279 280 /* 281 * For the shared version of the threads library, the above is sufficient. 282 * But for the archive version of the library, we need a little bit more. 283 * Namely, we must arrange for this particular module to be pulled in from 284 * the archive library at link time. To accomplish that, we define and 285 * initialize a variable, "_thread_autoinit_dummy_decl". This variable is 286 * referenced (as an extern) from libc/stdlib/exit.c. This will always 287 * create a need for this module, ensuring that it is present in the 288 * executable. 289 */ 290 extern int _thread_autoinit_dummy_decl; 291 int _thread_autoinit_dummy_decl = 0; 292 293 void 294 _thread_init_hack(void) 295 { 296 297 _libpthread_init(NULL); 298 } 299 300 301 /* 302 * Threaded process initialization. 303 * 304 * This is only called under two conditions: 305 * 306 * 1) Some thread routines have detected that the library hasn't yet 307 * been initialized (_thr_initial == NULL && curthread == NULL), or 308 * 309 * 2) An explicit call to reinitialize after a fork (indicated 310 * by curthread != NULL) 311 */ 312 void 313 _libpthread_init(struct pthread *curthread) 314 { 315 int first, dlopened; 316 317 /* Check if this function has already been called: */ 318 if (_thr_initial != NULL && curthread == NULL) 319 /* Only initialize the threaded application once. */ 320 return; 321 322 /* 323 * Check the size of the jump table to make sure it is preset 324 * with the correct number of entries. 325 */ 326 if (sizeof(jmp_table) != sizeof(pthread_func_t) * PJT_MAX * 2) 327 PANIC("Thread jump table not properly initialized"); 328 memcpy(__thr_jtable, jmp_table, sizeof(jmp_table)); 329 __thr_interpose_libc(); 330 331 /* Initialize pthread private data. */ 332 init_private(); 333 334 /* Set the initial thread. */ 335 if (curthread == NULL) { 336 first = 1; 337 /* Create and initialize the initial thread. */ 338 curthread = _thr_alloc(NULL); 339 if (curthread == NULL) 340 PANIC("Can't allocate initial thread"); 341 init_main_thread(curthread); 342 } else { 343 first = 0; 344 } 345 346 /* 347 * Add the thread to the thread list queue. 348 */ 349 THR_LIST_ADD(curthread); 350 _thread_active_threads = 1; 351 352 /* Setup the thread specific data */ 353 _tcb_set(curthread->tcb); 354 355 if (first) { 356 _thr_initial = curthread; 357 dlopened = _rtld_is_dlopened(&_thread_autoinit_dummy_decl) != 0; 358 _thr_signal_init(dlopened); 359 if (_thread_event_mask & TD_CREATE) 360 _thr_report_creation(curthread, curthread); 361 /* 362 * Always use our rtld lock implementation. 363 * It is faster because it postpones signal handlers 364 * instead of calling sigprocmask(2). 365 */ 366 _thr_rtld_init(); 367 } 368 } 369 370 /* 371 * This function and pthread_create() do a lot of the same things. 372 * It'd be nice to consolidate the common stuff in one place. 373 */ 374 static void 375 init_main_thread(struct pthread *thread) 376 { 377 struct sched_param sched_param; 378 int i; 379 380 /* Setup the thread attributes. */ 381 thr_self(&thread->tid); 382 thread->attr = _pthread_attr_default; 383 /* 384 * Set up the thread stack. 385 * 386 * Create a red zone below the main stack. All other stacks 387 * are constrained to a maximum size by the parameters 388 * passed to mmap(), but this stack is only limited by 389 * resource limits, so this stack needs an explicitly mapped 390 * red zone to protect the thread stack that is just beyond. 391 */ 392 if (mmap(_usrstack - _thr_stack_initial - 393 _thr_guard_default, _thr_guard_default, 0, MAP_ANON, 394 -1, 0) == MAP_FAILED) 395 PANIC("Cannot allocate red zone for initial thread"); 396 397 /* 398 * Mark the stack as an application supplied stack so that it 399 * isn't deallocated. 400 * 401 * XXX - I'm not sure it would hurt anything to deallocate 402 * the main thread stack because deallocation doesn't 403 * actually free() it; it just puts it in the free 404 * stack queue for later reuse. 405 */ 406 thread->attr.stackaddr_attr = _usrstack - _thr_stack_initial; 407 thread->attr.stacksize_attr = _thr_stack_initial; 408 thread->attr.guardsize_attr = _thr_guard_default; 409 thread->attr.flags |= THR_STACK_USER; 410 411 /* 412 * Write a magic value to the thread structure 413 * to help identify valid ones: 414 */ 415 thread->magic = THR_MAGIC; 416 417 thread->cancel_enable = 1; 418 thread->cancel_async = 0; 419 420 /* Initialize the mutex queues */ 421 for (i = 0; i < TMQ_NITEMS; i++) 422 TAILQ_INIT(&thread->mq[i]); 423 424 thread->state = PS_RUNNING; 425 426 _thr_getscheduler(thread->tid, &thread->attr.sched_policy, 427 &sched_param); 428 thread->attr.prio = sched_param.sched_priority; 429 430 #ifdef _PTHREAD_FORCED_UNWIND 431 thread->unwind_stackend = _usrstack; 432 #endif 433 434 /* Others cleared to zero by thr_alloc() */ 435 } 436 437 bool 438 __thr_get_main_stack_base(char **base) 439 { 440 size_t len; 441 int mib[2]; 442 443 if (elf_aux_info(AT_USRSTACKBASE, base, sizeof(*base)) == 0) 444 return (true); 445 446 mib[0] = CTL_KERN; 447 mib[1] = KERN_USRSTACK; 448 len = sizeof(*base); 449 if (sysctl(mib, nitems(mib), base, &len, NULL, 0) == 0) 450 return (true); 451 452 return (false); 453 } 454 455 bool 456 __thr_get_main_stack_lim(size_t *lim) 457 { 458 struct rlimit rlim; 459 460 if (elf_aux_info(AT_USRSTACKLIM, lim, sizeof(*lim)) == 0) 461 return (true); 462 463 if (getrlimit(RLIMIT_STACK, &rlim) == 0) { 464 *lim = rlim.rlim_cur; 465 return (true); 466 } 467 468 return (false); 469 } 470 471 static void 472 init_private(void) 473 { 474 char *env, *env_bigstack, *env_splitstack; 475 476 _thr_umutex_init(&_mutex_static_lock); 477 _thr_umutex_init(&_cond_static_lock); 478 _thr_umutex_init(&_rwlock_static_lock); 479 _thr_umutex_init(&_keytable_lock); 480 _thr_urwlock_init(&_thr_atfork_lock); 481 _thr_umutex_init(&_thr_event_lock); 482 _thr_umutex_init(&_suspend_all_lock); 483 _thr_spinlock_init(); 484 _thr_list_init(); 485 _thr_wake_addr_init(); 486 _sleepq_init(); 487 _single_thread = NULL; 488 _suspend_all_waiters = 0; 489 490 /* 491 * Avoid reinitializing some things if they don't need to be, 492 * e.g. after a fork(). 493 */ 494 if (init_once == 0) { 495 __thr_pshared_init(); 496 __thr_malloc_init(); 497 498 /* Find the stack top */ 499 if (!__thr_get_main_stack_base(&_usrstack)) 500 PANIC("Cannot get kern.usrstack"); 501 env_bigstack = getenv("LIBPTHREAD_BIGSTACK_MAIN"); 502 env_splitstack = getenv("LIBPTHREAD_SPLITSTACK_MAIN"); 503 if (env_bigstack != NULL || env_splitstack == NULL) { 504 if (!__thr_get_main_stack_lim(&_thr_stack_initial)) 505 PANIC("Cannot get stack rlimit"); 506 } 507 _thr_is_smp = sysconf(_SC_NPROCESSORS_CONF); 508 if (_thr_is_smp == -1) 509 PANIC("Cannot get _SC_NPROCESSORS_CONF"); 510 _thr_is_smp = (_thr_is_smp > 1); 511 _thr_page_size = getpagesize(); 512 _thr_guard_default = _thr_page_size; 513 _pthread_attr_default.guardsize_attr = _thr_guard_default; 514 _pthread_attr_default.stacksize_attr = _thr_stack_default; 515 env = getenv("LIBPTHREAD_SPINLOOPS"); 516 if (env) 517 _thr_spinloops = atoi(env); 518 env = getenv("LIBPTHREAD_YIELDLOOPS"); 519 if (env) 520 _thr_yieldloops = atoi(env); 521 env = getenv("LIBPTHREAD_QUEUE_FIFO"); 522 if (env) 523 _thr_queuefifo = atoi(env); 524 TAILQ_INIT(&_thr_atfork_list); 525 env = getenv("LIBPTHREAD_UMTX_MIN_TIMEOUT"); 526 if (env) { 527 char *endptr; 528 long mint; 529 530 mint = strtol(env, &endptr, 0); 531 if (*endptr == '\0' && mint >= 0) { 532 _umtx_op(NULL, UMTX_OP_SET_MIN_TIMEOUT, 533 mint, NULL, NULL); 534 } 535 } 536 } 537 init_once = 1; 538 } 539