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 * $FreeBSD$ 34 */ 35 36 #include "namespace.h" 37 #include <sys/types.h> 38 #include <sys/signalvar.h> 39 #include <sys/ioctl.h> 40 #include <sys/link_elf.h> 41 #include <sys/resource.h> 42 #include <sys/sysctl.h> 43 #include <sys/ttycom.h> 44 #include <sys/mman.h> 45 #include <sys/rtprio.h> 46 #include <errno.h> 47 #include <fcntl.h> 48 #include <paths.h> 49 #include <pthread.h> 50 #include <pthread_np.h> 51 #include <signal.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <time.h> 55 #include <unistd.h> 56 #include "un-namespace.h" 57 58 #include "libc_private.h" 59 #include "thr_private.h" 60 61 char *_usrstack; 62 struct pthread *_thr_initial; 63 int _libthr_debug; 64 int _thread_event_mask; 65 struct pthread *_thread_last_event; 66 pthreadlist _thread_list = TAILQ_HEAD_INITIALIZER(_thread_list); 67 pthreadlist _thread_gc_list = TAILQ_HEAD_INITIALIZER(_thread_gc_list); 68 int _thread_active_threads = 1; 69 atfork_head _thr_atfork_list = TAILQ_HEAD_INITIALIZER(_thr_atfork_list); 70 struct urwlock _thr_atfork_lock = DEFAULT_URWLOCK; 71 72 struct pthread_prio _thr_priorities[3] = { 73 {RTP_PRIO_MIN, RTP_PRIO_MAX, 0}, /* FIFO */ 74 {0, 0, 63}, /* OTHER */ 75 {RTP_PRIO_MIN, RTP_PRIO_MAX, 0} /* RR */ 76 }; 77 78 struct pthread_attr _pthread_attr_default = { 79 .sched_policy = SCHED_OTHER, 80 .sched_inherit = PTHREAD_INHERIT_SCHED, 81 .prio = 0, 82 .suspend = THR_CREATE_RUNNING, 83 .flags = PTHREAD_SCOPE_SYSTEM, 84 .stackaddr_attr = NULL, 85 .stacksize_attr = THR_STACK_DEFAULT, 86 .guardsize_attr = 0, 87 .cpusetsize = 0, 88 .cpuset = NULL 89 }; 90 91 struct pthread_mutex_attr _pthread_mutexattr_default = { 92 .m_type = PTHREAD_MUTEX_DEFAULT, 93 .m_protocol = PTHREAD_PRIO_NONE, 94 .m_ceiling = 0, 95 .m_pshared = PTHREAD_PROCESS_PRIVATE, 96 }; 97 98 struct pthread_mutex_attr _pthread_mutexattr_adaptive_default = { 99 .m_type = PTHREAD_MUTEX_ADAPTIVE_NP, 100 .m_protocol = PTHREAD_PRIO_NONE, 101 .m_ceiling = 0, 102 .m_pshared = PTHREAD_PROCESS_PRIVATE, 103 }; 104 105 /* Default condition variable attributes: */ 106 struct pthread_cond_attr _pthread_condattr_default = { 107 .c_pshared = PTHREAD_PROCESS_PRIVATE, 108 .c_clockid = CLOCK_REALTIME 109 }; 110 111 pid_t _thr_pid; 112 int _thr_is_smp = 0; 113 size_t _thr_guard_default; 114 size_t _thr_stack_default = THR_STACK_DEFAULT; 115 size_t _thr_stack_initial = THR_STACK_INITIAL; 116 int _thr_page_size; 117 int _thr_spinloops; 118 int _thr_yieldloops; 119 int _thr_queuefifo = 4; 120 int _gc_count; 121 struct umutex _mutex_static_lock = DEFAULT_UMUTEX; 122 struct umutex _cond_static_lock = DEFAULT_UMUTEX; 123 struct umutex _rwlock_static_lock = DEFAULT_UMUTEX; 124 struct umutex _keytable_lock = DEFAULT_UMUTEX; 125 struct urwlock _thr_list_lock = DEFAULT_URWLOCK; 126 struct umutex _thr_event_lock = DEFAULT_UMUTEX; 127 struct umutex _suspend_all_lock = DEFAULT_UMUTEX; 128 struct pthread *_single_thread; 129 int _suspend_all_cycle; 130 int _suspend_all_waiters; 131 132 int __pthread_cond_wait(pthread_cond_t *, pthread_mutex_t *); 133 int __pthread_mutex_lock(pthread_mutex_t *); 134 int __pthread_mutex_trylock(pthread_mutex_t *); 135 void _thread_init_hack(void) __attribute__ ((constructor)); 136 137 static void init_private(void); 138 static void init_main_thread(struct pthread *thread); 139 140 /* 141 * All weak references used within libc should be in this table. 142 * This is so that static libraries will work. 143 */ 144 145 STATIC_LIB_REQUIRE(_fork); 146 STATIC_LIB_REQUIRE(_pthread_getspecific); 147 STATIC_LIB_REQUIRE(_pthread_key_create); 148 STATIC_LIB_REQUIRE(_pthread_key_delete); 149 STATIC_LIB_REQUIRE(_pthread_mutex_destroy); 150 STATIC_LIB_REQUIRE(_pthread_mutex_init); 151 STATIC_LIB_REQUIRE(_pthread_mutex_lock); 152 STATIC_LIB_REQUIRE(_pthread_mutex_trylock); 153 STATIC_LIB_REQUIRE(_pthread_mutex_unlock); 154 STATIC_LIB_REQUIRE(_pthread_mutexattr_init); 155 STATIC_LIB_REQUIRE(_pthread_mutexattr_destroy); 156 STATIC_LIB_REQUIRE(_pthread_mutexattr_settype); 157 STATIC_LIB_REQUIRE(_pthread_once); 158 STATIC_LIB_REQUIRE(_pthread_setspecific); 159 STATIC_LIB_REQUIRE(_raise); 160 STATIC_LIB_REQUIRE(_sem_destroy); 161 STATIC_LIB_REQUIRE(_sem_getvalue); 162 STATIC_LIB_REQUIRE(_sem_init); 163 STATIC_LIB_REQUIRE(_sem_post); 164 STATIC_LIB_REQUIRE(_sem_timedwait); 165 STATIC_LIB_REQUIRE(_sem_trywait); 166 STATIC_LIB_REQUIRE(_sem_wait); 167 STATIC_LIB_REQUIRE(_sigaction); 168 STATIC_LIB_REQUIRE(_sigprocmask); 169 STATIC_LIB_REQUIRE(_sigsuspend); 170 STATIC_LIB_REQUIRE(_sigtimedwait); 171 STATIC_LIB_REQUIRE(_sigwait); 172 STATIC_LIB_REQUIRE(_sigwaitinfo); 173 STATIC_LIB_REQUIRE(_spinlock); 174 STATIC_LIB_REQUIRE(_spinlock_debug); 175 STATIC_LIB_REQUIRE(_spinunlock); 176 STATIC_LIB_REQUIRE(_thread_init_hack); 177 178 /* 179 * These are needed when linking statically. All references within 180 * libgcc (and in the future libc) to these routines are weak, but 181 * if they are not (strongly) referenced by the application or other 182 * libraries, then the actual functions will not be loaded. 183 */ 184 STATIC_LIB_REQUIRE(_pthread_once); 185 STATIC_LIB_REQUIRE(_pthread_key_create); 186 STATIC_LIB_REQUIRE(_pthread_key_delete); 187 STATIC_LIB_REQUIRE(_pthread_getspecific); 188 STATIC_LIB_REQUIRE(_pthread_setspecific); 189 STATIC_LIB_REQUIRE(_pthread_mutex_init); 190 STATIC_LIB_REQUIRE(_pthread_mutex_destroy); 191 STATIC_LIB_REQUIRE(_pthread_mutex_lock); 192 STATIC_LIB_REQUIRE(_pthread_mutex_trylock); 193 STATIC_LIB_REQUIRE(_pthread_mutex_unlock); 194 STATIC_LIB_REQUIRE(_pthread_create); 195 196 /* Pull in all symbols required by libthread_db */ 197 STATIC_LIB_REQUIRE(_thread_state_running); 198 199 #define DUAL_ENTRY(entry) \ 200 (pthread_func_t)entry, (pthread_func_t)entry 201 202 static pthread_func_t jmp_table[][2] = { 203 {DUAL_ENTRY(_pthread_atfork)}, /* PJT_ATFORK */ 204 {DUAL_ENTRY(_pthread_attr_destroy)}, /* PJT_ATTR_DESTROY */ 205 {DUAL_ENTRY(_pthread_attr_getdetachstate)}, /* PJT_ATTR_GETDETACHSTATE */ 206 {DUAL_ENTRY(_pthread_attr_getguardsize)}, /* PJT_ATTR_GETGUARDSIZE */ 207 {DUAL_ENTRY(_pthread_attr_getinheritsched)}, /* PJT_ATTR_GETINHERITSCHED */ 208 {DUAL_ENTRY(_pthread_attr_getschedparam)}, /* PJT_ATTR_GETSCHEDPARAM */ 209 {DUAL_ENTRY(_pthread_attr_getschedpolicy)}, /* PJT_ATTR_GETSCHEDPOLICY */ 210 {DUAL_ENTRY(_pthread_attr_getscope)}, /* PJT_ATTR_GETSCOPE */ 211 {DUAL_ENTRY(_pthread_attr_getstackaddr)}, /* PJT_ATTR_GETSTACKADDR */ 212 {DUAL_ENTRY(_pthread_attr_getstacksize)}, /* PJT_ATTR_GETSTACKSIZE */ 213 {DUAL_ENTRY(_pthread_attr_init)}, /* PJT_ATTR_INIT */ 214 {DUAL_ENTRY(_pthread_attr_setdetachstate)}, /* PJT_ATTR_SETDETACHSTATE */ 215 {DUAL_ENTRY(_pthread_attr_setguardsize)}, /* PJT_ATTR_SETGUARDSIZE */ 216 {DUAL_ENTRY(_pthread_attr_setinheritsched)}, /* PJT_ATTR_SETINHERITSCHED */ 217 {DUAL_ENTRY(_pthread_attr_setschedparam)}, /* PJT_ATTR_SETSCHEDPARAM */ 218 {DUAL_ENTRY(_pthread_attr_setschedpolicy)}, /* PJT_ATTR_SETSCHEDPOLICY */ 219 {DUAL_ENTRY(_pthread_attr_setscope)}, /* PJT_ATTR_SETSCOPE */ 220 {DUAL_ENTRY(_pthread_attr_setstackaddr)}, /* PJT_ATTR_SETSTACKADDR */ 221 {DUAL_ENTRY(_pthread_attr_setstacksize)}, /* PJT_ATTR_SETSTACKSIZE */ 222 {DUAL_ENTRY(_pthread_cancel)}, /* PJT_CANCEL */ 223 {DUAL_ENTRY(_pthread_cleanup_pop)}, /* PJT_CLEANUP_POP */ 224 {DUAL_ENTRY(_pthread_cleanup_push)}, /* PJT_CLEANUP_PUSH */ 225 {DUAL_ENTRY(_pthread_cond_broadcast)}, /* PJT_COND_BROADCAST */ 226 {DUAL_ENTRY(_pthread_cond_destroy)}, /* PJT_COND_DESTROY */ 227 {DUAL_ENTRY(_pthread_cond_init)}, /* PJT_COND_INIT */ 228 {DUAL_ENTRY(_pthread_cond_signal)}, /* PJT_COND_SIGNAL */ 229 {DUAL_ENTRY(_pthread_cond_timedwait)}, /* PJT_COND_TIMEDWAIT */ 230 {(pthread_func_t)__pthread_cond_wait, 231 (pthread_func_t)_pthread_cond_wait}, /* PJT_COND_WAIT */ 232 {DUAL_ENTRY(_pthread_detach)}, /* PJT_DETACH */ 233 {DUAL_ENTRY(_pthread_equal)}, /* PJT_EQUAL */ 234 {DUAL_ENTRY(_pthread_exit)}, /* PJT_EXIT */ 235 {DUAL_ENTRY(_pthread_getspecific)}, /* PJT_GETSPECIFIC */ 236 {DUAL_ENTRY(_pthread_join)}, /* PJT_JOIN */ 237 {DUAL_ENTRY(_pthread_key_create)}, /* PJT_KEY_CREATE */ 238 {DUAL_ENTRY(_pthread_key_delete)}, /* PJT_KEY_DELETE*/ 239 {DUAL_ENTRY(_pthread_kill)}, /* PJT_KILL */ 240 {DUAL_ENTRY(_pthread_main_np)}, /* PJT_MAIN_NP */ 241 {DUAL_ENTRY(_pthread_mutexattr_destroy)}, /* PJT_MUTEXATTR_DESTROY */ 242 {DUAL_ENTRY(_pthread_mutexattr_init)}, /* PJT_MUTEXATTR_INIT */ 243 {DUAL_ENTRY(_pthread_mutexattr_settype)}, /* PJT_MUTEXATTR_SETTYPE */ 244 {DUAL_ENTRY(_pthread_mutex_destroy)}, /* PJT_MUTEX_DESTROY */ 245 {DUAL_ENTRY(_pthread_mutex_init)}, /* PJT_MUTEX_INIT */ 246 {(pthread_func_t)__pthread_mutex_lock, 247 (pthread_func_t)_pthread_mutex_lock}, /* PJT_MUTEX_LOCK */ 248 {(pthread_func_t)__pthread_mutex_trylock, 249 (pthread_func_t)_pthread_mutex_trylock},/* PJT_MUTEX_TRYLOCK */ 250 {DUAL_ENTRY(_pthread_mutex_unlock)}, /* PJT_MUTEX_UNLOCK */ 251 {DUAL_ENTRY(_pthread_once)}, /* PJT_ONCE */ 252 {DUAL_ENTRY(_pthread_rwlock_destroy)}, /* PJT_RWLOCK_DESTROY */ 253 {DUAL_ENTRY(_pthread_rwlock_init)}, /* PJT_RWLOCK_INIT */ 254 {DUAL_ENTRY(_pthread_rwlock_rdlock)}, /* PJT_RWLOCK_RDLOCK */ 255 {DUAL_ENTRY(_pthread_rwlock_tryrdlock)},/* PJT_RWLOCK_TRYRDLOCK */ 256 {DUAL_ENTRY(_pthread_rwlock_trywrlock)},/* PJT_RWLOCK_TRYWRLOCK */ 257 {DUAL_ENTRY(_pthread_rwlock_unlock)}, /* PJT_RWLOCK_UNLOCK */ 258 {DUAL_ENTRY(_pthread_rwlock_wrlock)}, /* PJT_RWLOCK_WRLOCK */ 259 {DUAL_ENTRY(_pthread_self)}, /* PJT_SELF */ 260 {DUAL_ENTRY(_pthread_setcancelstate)}, /* PJT_SETCANCELSTATE */ 261 {DUAL_ENTRY(_pthread_setcanceltype)}, /* PJT_SETCANCELTYPE */ 262 {DUAL_ENTRY(_pthread_setspecific)}, /* PJT_SETSPECIFIC */ 263 {DUAL_ENTRY(_pthread_sigmask)}, /* PJT_SIGMASK */ 264 {DUAL_ENTRY(_pthread_testcancel)}, /* PJT_TESTCANCEL */ 265 {DUAL_ENTRY(__pthread_cleanup_pop_imp)},/* PJT_CLEANUP_POP_IMP */ 266 {DUAL_ENTRY(__pthread_cleanup_push_imp)},/* PJT_CLEANUP_PUSH_IMP */ 267 {DUAL_ENTRY(_pthread_cancel_enter)}, /* PJT_CANCEL_ENTER */ 268 {DUAL_ENTRY(_pthread_cancel_leave)} /* PJT_CANCEL_LEAVE */ 269 }; 270 271 static int init_once = 0; 272 273 /* 274 * For the shared version of the threads library, the above is sufficient. 275 * But for the archive version of the library, we need a little bit more. 276 * Namely, we must arrange for this particular module to be pulled in from 277 * the archive library at link time. To accomplish that, we define and 278 * initialize a variable, "_thread_autoinit_dummy_decl". This variable is 279 * referenced (as an extern) from libc/stdlib/exit.c. This will always 280 * create a need for this module, ensuring that it is present in the 281 * executable. 282 */ 283 extern int _thread_autoinit_dummy_decl; 284 int _thread_autoinit_dummy_decl = 0; 285 286 void 287 _thread_init_hack(void) 288 { 289 290 _libpthread_init(NULL); 291 } 292 293 294 /* 295 * Threaded process initialization. 296 * 297 * This is only called under two conditions: 298 * 299 * 1) Some thread routines have detected that the library hasn't yet 300 * been initialized (_thr_initial == NULL && curthread == NULL), or 301 * 302 * 2) An explicit call to reinitialize after a fork (indicated 303 * by curthread != NULL) 304 */ 305 void 306 _libpthread_init(struct pthread *curthread) 307 { 308 int first, dlopened; 309 310 /* Check if this function has already been called: */ 311 if ((_thr_initial != NULL) && (curthread == NULL)) 312 /* Only initialize the threaded application once. */ 313 return; 314 315 /* 316 * Check the size of the jump table to make sure it is preset 317 * with the correct number of entries. 318 */ 319 if (sizeof(jmp_table) != (sizeof(pthread_func_t) * PJT_MAX * 2)) 320 PANIC("Thread jump table not properly initialized"); 321 memcpy(__thr_jtable, jmp_table, sizeof(jmp_table)); 322 __thr_interpose_libc(); 323 324 /* Initialize pthread private data. */ 325 init_private(); 326 327 /* Set the initial thread. */ 328 if (curthread == NULL) { 329 first = 1; 330 /* Create and initialize the initial thread. */ 331 curthread = _thr_alloc(NULL); 332 if (curthread == NULL) 333 PANIC("Can't allocate initial thread"); 334 init_main_thread(curthread); 335 } else { 336 first = 0; 337 } 338 339 /* 340 * Add the thread to the thread list queue. 341 */ 342 THR_LIST_ADD(curthread); 343 _thread_active_threads = 1; 344 345 /* Setup the thread specific data */ 346 _tcb_set(curthread->tcb); 347 348 if (first) { 349 _thr_initial = curthread; 350 dlopened = _rtld_is_dlopened(&_thread_autoinit_dummy_decl) != 0; 351 _thr_signal_init(dlopened); 352 if (_thread_event_mask & TD_CREATE) 353 _thr_report_creation(curthread, curthread); 354 /* 355 * Always use our rtld lock implementation. 356 * It is faster because it postpones signal handlers 357 * instead of calling sigprocmask(2). 358 */ 359 _thr_rtld_init(); 360 } 361 } 362 363 /* 364 * This function and pthread_create() do a lot of the same things. 365 * It'd be nice to consolidate the common stuff in one place. 366 */ 367 static void 368 init_main_thread(struct pthread *thread) 369 { 370 struct sched_param sched_param; 371 int i; 372 373 /* Setup the thread attributes. */ 374 thr_self(&thread->tid); 375 thread->attr = _pthread_attr_default; 376 /* 377 * Set up the thread stack. 378 * 379 * Create a red zone below the main stack. All other stacks 380 * are constrained to a maximum size by the parameters 381 * passed to mmap(), but this stack is only limited by 382 * resource limits, so this stack needs an explicitly mapped 383 * red zone to protect the thread stack that is just beyond. 384 */ 385 if (mmap(_usrstack - _thr_stack_initial - 386 _thr_guard_default, _thr_guard_default, 0, MAP_ANON, 387 -1, 0) == MAP_FAILED) 388 PANIC("Cannot allocate red zone for initial thread"); 389 390 /* 391 * Mark the stack as an application supplied stack so that it 392 * isn't deallocated. 393 * 394 * XXX - I'm not sure it would hurt anything to deallocate 395 * the main thread stack because deallocation doesn't 396 * actually free() it; it just puts it in the free 397 * stack queue for later reuse. 398 */ 399 thread->attr.stackaddr_attr = _usrstack - _thr_stack_initial; 400 thread->attr.stacksize_attr = _thr_stack_initial; 401 thread->attr.guardsize_attr = _thr_guard_default; 402 thread->attr.flags |= THR_STACK_USER; 403 404 /* 405 * Write a magic value to the thread structure 406 * to help identify valid ones: 407 */ 408 thread->magic = THR_MAGIC; 409 410 thread->cancel_enable = 1; 411 thread->cancel_async = 0; 412 413 /* Initialize the mutex queues */ 414 for (i = 0; i < TMQ_NITEMS; i++) 415 TAILQ_INIT(&thread->mq[i]); 416 417 thread->state = PS_RUNNING; 418 419 _thr_getscheduler(thread->tid, &thread->attr.sched_policy, 420 &sched_param); 421 thread->attr.prio = sched_param.sched_priority; 422 423 #ifdef _PTHREAD_FORCED_UNWIND 424 thread->unwind_stackend = _usrstack; 425 #endif 426 427 /* Others cleared to zero by thr_alloc() */ 428 } 429 430 static void 431 init_private(void) 432 { 433 struct rlimit rlim; 434 size_t len; 435 int mib[2]; 436 char *env, *env_bigstack, *env_splitstack; 437 438 _thr_umutex_init(&_mutex_static_lock); 439 _thr_umutex_init(&_cond_static_lock); 440 _thr_umutex_init(&_rwlock_static_lock); 441 _thr_umutex_init(&_keytable_lock); 442 _thr_urwlock_init(&_thr_atfork_lock); 443 _thr_umutex_init(&_thr_event_lock); 444 _thr_umutex_init(&_suspend_all_lock); 445 _thr_once_init(); 446 _thr_spinlock_init(); 447 _thr_list_init(); 448 _thr_wake_addr_init(); 449 _sleepq_init(); 450 _single_thread = NULL; 451 _suspend_all_waiters = 0; 452 453 /* 454 * Avoid reinitializing some things if they don't need to be, 455 * e.g. after a fork(). 456 */ 457 if (init_once == 0) { 458 __thr_pshared_init(); 459 /* Find the stack top */ 460 mib[0] = CTL_KERN; 461 mib[1] = KERN_USRSTACK; 462 len = sizeof (_usrstack); 463 if (sysctl(mib, 2, &_usrstack, &len, NULL, 0) == -1) 464 PANIC("Cannot get kern.usrstack from sysctl"); 465 env_bigstack = getenv("LIBPTHREAD_BIGSTACK_MAIN"); 466 env_splitstack = getenv("LIBPTHREAD_SPLITSTACK_MAIN"); 467 if (env_bigstack != NULL || env_splitstack == NULL) { 468 if (getrlimit(RLIMIT_STACK, &rlim) == -1) 469 PANIC("Cannot get stack rlimit"); 470 _thr_stack_initial = rlim.rlim_cur; 471 } 472 len = sizeof(_thr_is_smp); 473 sysctlbyname("kern.smp.cpus", &_thr_is_smp, &len, NULL, 0); 474 _thr_is_smp = (_thr_is_smp > 1); 475 _thr_page_size = getpagesize(); 476 _thr_guard_default = _thr_page_size; 477 _pthread_attr_default.guardsize_attr = _thr_guard_default; 478 _pthread_attr_default.stacksize_attr = _thr_stack_default; 479 env = getenv("LIBPTHREAD_SPINLOOPS"); 480 if (env) 481 _thr_spinloops = atoi(env); 482 env = getenv("LIBPTHREAD_YIELDLOOPS"); 483 if (env) 484 _thr_yieldloops = atoi(env); 485 env = getenv("LIBPTHREAD_QUEUE_FIFO"); 486 if (env) 487 _thr_queuefifo = atoi(env); 488 TAILQ_INIT(&_thr_atfork_list); 489 } 490 init_once = 1; 491 } 492