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