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 static 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 };
96
97 struct pthread_mutex_attr _pthread_mutexattr_adaptive_default = {
98 .m_type = PTHREAD_MUTEX_ADAPTIVE_NP,
99 .m_protocol = PTHREAD_PRIO_NONE,
100 .m_ceiling = 0
101 };
102
103 /* Default condition variable attributes: */
104 struct pthread_cond_attr _pthread_condattr_default = {
105 .c_pshared = PTHREAD_PROCESS_PRIVATE,
106 .c_clockid = CLOCK_REALTIME
107 };
108
109 pid_t _thr_pid;
110 int _thr_is_smp = 0;
111 size_t _thr_guard_default;
112 int _thr_page_size;
113 int _thr_spinloops;
114 int _thr_yieldloops;
115 int _thr_queuefifo = 4;
116 int _gc_count;
117 struct umutex _mutex_static_lock = DEFAULT_UMUTEX;
118 struct umutex _cond_static_lock = DEFAULT_UMUTEX;
119 struct umutex _rwlock_static_lock = DEFAULT_UMUTEX;
120 struct umutex _keytable_lock = DEFAULT_UMUTEX;
121 struct urwlock _thr_list_lock = DEFAULT_URWLOCK;
122 struct umutex _thr_event_lock = DEFAULT_UMUTEX;
123 struct umutex _suspend_all_lock = DEFAULT_UMUTEX;
124 struct pthread *_single_thread;
125 int _suspend_all_cycle;
126 int _suspend_all_waiters;
127
128 int __pthread_cond_wait(pthread_cond_t *, pthread_mutex_t *);
129 int __pthread_mutex_lock(pthread_mutex_t *);
130 int __pthread_mutex_trylock(pthread_mutex_t *);
131 void _thread_init_hack(void) __attribute__ ((constructor));
132
133 static void init_private(void);
134 static void init_main_thread(struct pthread *thread);
135
136 /*
137 * All weak references used within libc should be in this table.
138 * This is so that static libraries will work.
139 */
140
141 STATIC_LIB_REQUIRE(_fork);
142 STATIC_LIB_REQUIRE(_pthread_getspecific);
143 STATIC_LIB_REQUIRE(_pthread_key_create);
144 STATIC_LIB_REQUIRE(_pthread_key_delete);
145 STATIC_LIB_REQUIRE(_pthread_mutex_destroy);
146 STATIC_LIB_REQUIRE(_pthread_mutex_init);
147 STATIC_LIB_REQUIRE(_pthread_mutex_lock);
148 STATIC_LIB_REQUIRE(_pthread_mutex_trylock);
149 STATIC_LIB_REQUIRE(_pthread_mutex_unlock);
150 STATIC_LIB_REQUIRE(_pthread_mutexattr_init);
151 STATIC_LIB_REQUIRE(_pthread_mutexattr_destroy);
152 STATIC_LIB_REQUIRE(_pthread_mutexattr_settype);
153 STATIC_LIB_REQUIRE(_pthread_once);
154 STATIC_LIB_REQUIRE(_pthread_setspecific);
155 STATIC_LIB_REQUIRE(_raise);
156 STATIC_LIB_REQUIRE(_sem_destroy);
157 STATIC_LIB_REQUIRE(_sem_getvalue);
158 STATIC_LIB_REQUIRE(_sem_init);
159 STATIC_LIB_REQUIRE(_sem_post);
160 STATIC_LIB_REQUIRE(_sem_timedwait);
161 STATIC_LIB_REQUIRE(_sem_trywait);
162 STATIC_LIB_REQUIRE(_sem_wait);
163 STATIC_LIB_REQUIRE(_sigaction);
164 STATIC_LIB_REQUIRE(_sigprocmask);
165 STATIC_LIB_REQUIRE(_sigsuspend);
166 STATIC_LIB_REQUIRE(_sigtimedwait);
167 STATIC_LIB_REQUIRE(_sigwait);
168 STATIC_LIB_REQUIRE(_sigwaitinfo);
169 STATIC_LIB_REQUIRE(_spinlock);
170 STATIC_LIB_REQUIRE(_spinlock_debug);
171 STATIC_LIB_REQUIRE(_spinunlock);
172 STATIC_LIB_REQUIRE(_thread_init_hack);
173
174 /*
175 * These are needed when linking statically. All references within
176 * libgcc (and in the future libc) to these routines are weak, but
177 * if they are not (strongly) referenced by the application or other
178 * libraries, then the actual functions will not be loaded.
179 */
180 STATIC_LIB_REQUIRE(_pthread_once);
181 STATIC_LIB_REQUIRE(_pthread_key_create);
182 STATIC_LIB_REQUIRE(_pthread_key_delete);
183 STATIC_LIB_REQUIRE(_pthread_getspecific);
184 STATIC_LIB_REQUIRE(_pthread_setspecific);
185 STATIC_LIB_REQUIRE(_pthread_mutex_init);
186 STATIC_LIB_REQUIRE(_pthread_mutex_destroy);
187 STATIC_LIB_REQUIRE(_pthread_mutex_lock);
188 STATIC_LIB_REQUIRE(_pthread_mutex_trylock);
189 STATIC_LIB_REQUIRE(_pthread_mutex_unlock);
190 STATIC_LIB_REQUIRE(_pthread_create);
191
192 /* Pull in all symbols required by libthread_db */
193 STATIC_LIB_REQUIRE(_thread_state_running);
194
195 #define DUAL_ENTRY(entry) \
196 (pthread_func_t)entry, (pthread_func_t)entry
197
198 static pthread_func_t jmp_table[][2] = {
199 {DUAL_ENTRY(_pthread_atfork)}, /* PJT_ATFORK */
200 {DUAL_ENTRY(_pthread_attr_destroy)}, /* PJT_ATTR_DESTROY */
201 {DUAL_ENTRY(_pthread_attr_getdetachstate)}, /* PJT_ATTR_GETDETACHSTATE */
202 {DUAL_ENTRY(_pthread_attr_getguardsize)}, /* PJT_ATTR_GETGUARDSIZE */
203 {DUAL_ENTRY(_pthread_attr_getinheritsched)}, /* PJT_ATTR_GETINHERITSCHED */
204 {DUAL_ENTRY(_pthread_attr_getschedparam)}, /* PJT_ATTR_GETSCHEDPARAM */
205 {DUAL_ENTRY(_pthread_attr_getschedpolicy)}, /* PJT_ATTR_GETSCHEDPOLICY */
206 {DUAL_ENTRY(_pthread_attr_getscope)}, /* PJT_ATTR_GETSCOPE */
207 {DUAL_ENTRY(_pthread_attr_getstackaddr)}, /* PJT_ATTR_GETSTACKADDR */
208 {DUAL_ENTRY(_pthread_attr_getstacksize)}, /* PJT_ATTR_GETSTACKSIZE */
209 {DUAL_ENTRY(_pthread_attr_init)}, /* PJT_ATTR_INIT */
210 {DUAL_ENTRY(_pthread_attr_setdetachstate)}, /* PJT_ATTR_SETDETACHSTATE */
211 {DUAL_ENTRY(_pthread_attr_setguardsize)}, /* PJT_ATTR_SETGUARDSIZE */
212 {DUAL_ENTRY(_pthread_attr_setinheritsched)}, /* PJT_ATTR_SETINHERITSCHED */
213 {DUAL_ENTRY(_pthread_attr_setschedparam)}, /* PJT_ATTR_SETSCHEDPARAM */
214 {DUAL_ENTRY(_pthread_attr_setschedpolicy)}, /* PJT_ATTR_SETSCHEDPOLICY */
215 {DUAL_ENTRY(_pthread_attr_setscope)}, /* PJT_ATTR_SETSCOPE */
216 {DUAL_ENTRY(_pthread_attr_setstackaddr)}, /* PJT_ATTR_SETSTACKADDR */
217 {DUAL_ENTRY(_pthread_attr_setstacksize)}, /* PJT_ATTR_SETSTACKSIZE */
218 {DUAL_ENTRY(_pthread_cancel)}, /* PJT_CANCEL */
219 {DUAL_ENTRY(_pthread_cleanup_pop)}, /* PJT_CLEANUP_POP */
220 {DUAL_ENTRY(_pthread_cleanup_push)}, /* PJT_CLEANUP_PUSH */
221 {DUAL_ENTRY(_pthread_cond_broadcast)}, /* PJT_COND_BROADCAST */
222 {DUAL_ENTRY(_pthread_cond_destroy)}, /* PJT_COND_DESTROY */
223 {DUAL_ENTRY(_pthread_cond_init)}, /* PJT_COND_INIT */
224 {DUAL_ENTRY(_pthread_cond_signal)}, /* PJT_COND_SIGNAL */
225 {DUAL_ENTRY(_pthread_cond_timedwait)}, /* PJT_COND_TIMEDWAIT */
226 {(pthread_func_t)__pthread_cond_wait,
227 (pthread_func_t)_pthread_cond_wait}, /* PJT_COND_WAIT */
228 {DUAL_ENTRY(_pthread_detach)}, /* PJT_DETACH */
229 {DUAL_ENTRY(_pthread_equal)}, /* PJT_EQUAL */
230 {DUAL_ENTRY(_pthread_exit)}, /* PJT_EXIT */
231 {DUAL_ENTRY(_pthread_getspecific)}, /* PJT_GETSPECIFIC */
232 {DUAL_ENTRY(_pthread_join)}, /* PJT_JOIN */
233 {DUAL_ENTRY(_pthread_key_create)}, /* PJT_KEY_CREATE */
234 {DUAL_ENTRY(_pthread_key_delete)}, /* PJT_KEY_DELETE*/
235 {DUAL_ENTRY(_pthread_kill)}, /* PJT_KILL */
236 {DUAL_ENTRY(_pthread_main_np)}, /* PJT_MAIN_NP */
237 {DUAL_ENTRY(_pthread_mutexattr_destroy)}, /* PJT_MUTEXATTR_DESTROY */
238 {DUAL_ENTRY(_pthread_mutexattr_init)}, /* PJT_MUTEXATTR_INIT */
239 {DUAL_ENTRY(_pthread_mutexattr_settype)}, /* PJT_MUTEXATTR_SETTYPE */
240 {DUAL_ENTRY(_pthread_mutex_destroy)}, /* PJT_MUTEX_DESTROY */
241 {DUAL_ENTRY(_pthread_mutex_init)}, /* PJT_MUTEX_INIT */
242 {(pthread_func_t)__pthread_mutex_lock,
243 (pthread_func_t)_pthread_mutex_lock}, /* PJT_MUTEX_LOCK */
244 {(pthread_func_t)__pthread_mutex_trylock,
245 (pthread_func_t)_pthread_mutex_trylock},/* PJT_MUTEX_TRYLOCK */
246 {DUAL_ENTRY(_pthread_mutex_unlock)}, /* PJT_MUTEX_UNLOCK */
247 {DUAL_ENTRY(_pthread_once)}, /* PJT_ONCE */
248 {DUAL_ENTRY(_pthread_rwlock_destroy)}, /* PJT_RWLOCK_DESTROY */
249 {DUAL_ENTRY(_pthread_rwlock_init)}, /* PJT_RWLOCK_INIT */
250 {DUAL_ENTRY(_pthread_rwlock_rdlock)}, /* PJT_RWLOCK_RDLOCK */
251 {DUAL_ENTRY(_pthread_rwlock_tryrdlock)},/* PJT_RWLOCK_TRYRDLOCK */
252 {DUAL_ENTRY(_pthread_rwlock_trywrlock)},/* PJT_RWLOCK_TRYWRLOCK */
253 {DUAL_ENTRY(_pthread_rwlock_unlock)}, /* PJT_RWLOCK_UNLOCK */
254 {DUAL_ENTRY(_pthread_rwlock_wrlock)}, /* PJT_RWLOCK_WRLOCK */
255 {DUAL_ENTRY(_pthread_self)}, /* PJT_SELF */
256 {DUAL_ENTRY(_pthread_setcancelstate)}, /* PJT_SETCANCELSTATE */
257 {DUAL_ENTRY(_pthread_setcanceltype)}, /* PJT_SETCANCELTYPE */
258 {DUAL_ENTRY(_pthread_setspecific)}, /* PJT_SETSPECIFIC */
259 {DUAL_ENTRY(_pthread_sigmask)}, /* PJT_SIGMASK */
260 {DUAL_ENTRY(_pthread_testcancel)}, /* PJT_TESTCANCEL */
261 {DUAL_ENTRY(__pthread_cleanup_pop_imp)},/* PJT_CLEANUP_POP_IMP */
262 {DUAL_ENTRY(__pthread_cleanup_push_imp)},/* PJT_CLEANUP_PUSH_IMP */
263 {DUAL_ENTRY(_pthread_cancel_enter)}, /* PJT_CANCEL_ENTER */
264 {DUAL_ENTRY(_pthread_cancel_leave)} /* PJT_CANCEL_LEAVE */
265 };
266
267 static int init_once = 0;
268
269 /*
270 * For the shared version of the threads library, the above is sufficient.
271 * But for the archive version of the library, we need a little bit more.
272 * Namely, we must arrange for this particular module to be pulled in from
273 * the archive library at link time. To accomplish that, we define and
274 * initialize a variable, "_thread_autoinit_dummy_decl". This variable is
275 * referenced (as an extern) from libc/stdlib/exit.c. This will always
276 * create a need for this module, ensuring that it is present in the
277 * executable.
278 */
279 extern int _thread_autoinit_dummy_decl;
280 int _thread_autoinit_dummy_decl = 0;
281
282 void
_thread_init_hack(void)283 _thread_init_hack(void)
284 {
285
286 _libpthread_init(NULL);
287 }
288
289
290 /*
291 * Threaded process initialization.
292 *
293 * This is only called under two conditions:
294 *
295 * 1) Some thread routines have detected that the library hasn't yet
296 * been initialized (_thr_initial == NULL && curthread == NULL), or
297 *
298 * 2) An explicit call to reinitialize after a fork (indicated
299 * by curthread != NULL)
300 */
301 void
_libpthread_init(struct pthread * curthread)302 _libpthread_init(struct pthread *curthread)
303 {
304 int fd, first, dlopened;
305
306 /* Check if this function has already been called: */
307 if ((_thr_initial != NULL) && (curthread == NULL))
308 /* Only initialize the threaded application once. */
309 return;
310
311 /*
312 * Check the size of the jump table to make sure it is preset
313 * with the correct number of entries.
314 */
315 if (sizeof(jmp_table) != (sizeof(pthread_func_t) * PJT_MAX * 2))
316 PANIC("Thread jump table not properly initialized");
317 memcpy(__thr_jtable, jmp_table, sizeof(jmp_table));
318 __thr_interpose_libc();
319
320 /*
321 * Check for the special case of this process running as
322 * or in place of init as pid = 1:
323 */
324 if ((_thr_pid = getpid()) == 1) {
325 /*
326 * Setup a new session for this process which is
327 * assumed to be running as root.
328 */
329 if (setsid() == -1)
330 PANIC("Can't set session ID");
331 if (revoke(_PATH_CONSOLE) != 0)
332 PANIC("Can't revoke console");
333 if ((fd = __sys_openat(AT_FDCWD, _PATH_CONSOLE, O_RDWR)) < 0)
334 PANIC("Can't open console");
335 if (setlogin("root") == -1)
336 PANIC("Can't set login to root");
337 if (_ioctl(fd, TIOCSCTTY, (char *) NULL) == -1)
338 PANIC("Can't set controlling terminal");
339 }
340
341 /* Initialize pthread private data. */
342 init_private();
343
344 /* Set the initial thread. */
345 if (curthread == NULL) {
346 first = 1;
347 /* Create and initialize the initial thread. */
348 curthread = _thr_alloc(NULL);
349 if (curthread == NULL)
350 PANIC("Can't allocate initial thread");
351 init_main_thread(curthread);
352 } else {
353 first = 0;
354 }
355
356 /*
357 * Add the thread to the thread list queue.
358 */
359 THR_LIST_ADD(curthread);
360 _thread_active_threads = 1;
361
362 /* Setup the thread specific data */
363 _tcb_set(curthread->tcb);
364
365 if (first) {
366 _thr_initial = curthread;
367 dlopened = _rtld_is_dlopened(&_thread_autoinit_dummy_decl) != 0;
368 _thr_signal_init(dlopened);
369 if (_thread_event_mask & TD_CREATE)
370 _thr_report_creation(curthread, curthread);
371 /*
372 * Always use our rtld lock implementation.
373 * It is faster because it postpones signal handlers
374 * instead of calling sigprocmask(2).
375 */
376 _thr_rtld_init();
377 }
378 }
379
380 /*
381 * This function and pthread_create() do a lot of the same things.
382 * It'd be nice to consolidate the common stuff in one place.
383 */
384 static void
init_main_thread(struct pthread * thread)385 init_main_thread(struct pthread *thread)
386 {
387 struct sched_param sched_param;
388
389 /* Setup the thread attributes. */
390 thr_self(&thread->tid);
391 thread->attr = _pthread_attr_default;
392 /*
393 * Set up the thread stack.
394 *
395 * Create a red zone below the main stack. All other stacks
396 * are constrained to a maximum size by the parameters
397 * passed to mmap(), but this stack is only limited by
398 * resource limits, so this stack needs an explicitly mapped
399 * red zone to protect the thread stack that is just beyond.
400 */
401 if (mmap(_usrstack - THR_STACK_INITIAL - _thr_guard_default,
402 _thr_guard_default, PROT_NONE, MAP_ANON, -1, 0) == MAP_FAILED)
403 PANIC("Cannot allocate red zone for initial thread");
404
405 /*
406 * Mark the stack as an application supplied stack so that it
407 * isn't deallocated.
408 *
409 * XXX - I'm not sure it would hurt anything to deallocate
410 * the main thread stack because deallocation doesn't
411 * actually free() it; it just puts it in the free
412 * stack queue for later reuse.
413 */
414 thread->attr.stackaddr_attr = _usrstack - THR_STACK_INITIAL;
415 thread->attr.stacksize_attr = THR_STACK_INITIAL;
416 thread->attr.guardsize_attr = _thr_guard_default;
417 thread->attr.flags |= THR_STACK_USER;
418
419 /*
420 * Write a magic value to the thread structure
421 * to help identify valid ones:
422 */
423 thread->magic = THR_MAGIC;
424
425 thread->cancel_enable = 1;
426 thread->cancel_async = 0;
427
428 /* Initialize the mutex queue: */
429 TAILQ_INIT(&thread->mutexq);
430 TAILQ_INIT(&thread->pp_mutexq);
431
432 thread->state = PS_RUNNING;
433
434 _thr_getscheduler(thread->tid, &thread->attr.sched_policy,
435 &sched_param);
436 thread->attr.prio = sched_param.sched_priority;
437
438 #ifdef _PTHREAD_FORCED_UNWIND
439 thread->unwind_stackend = _usrstack;
440 #endif
441
442 /* Others cleared to zero by thr_alloc() */
443 }
444
445 static void
init_private(void)446 init_private(void)
447 {
448 struct rlimit rlim;
449 size_t len;
450 int mib[2];
451 char *env, *env_bigstack, *env_splitstack;
452
453 _thr_umutex_init(&_mutex_static_lock);
454 _thr_umutex_init(&_cond_static_lock);
455 _thr_umutex_init(&_rwlock_static_lock);
456 _thr_umutex_init(&_keytable_lock);
457 _thr_urwlock_init(&_thr_atfork_lock);
458 _thr_umutex_init(&_thr_event_lock);
459 _thr_umutex_init(&_suspend_all_lock);
460 _thr_once_init();
461 _thr_spinlock_init();
462 _thr_list_init();
463 _thr_wake_addr_init();
464 _sleepq_init();
465 _single_thread = NULL;
466 _suspend_all_waiters = 0;
467
468 /*
469 * Avoid reinitializing some things if they don't need to be,
470 * e.g. after a fork().
471 */
472 if (init_once == 0) {
473 /* Find the stack top */
474 mib[0] = CTL_KERN;
475 mib[1] = KERN_USRSTACK;
476 len = sizeof (_usrstack);
477 if (sysctl(mib, 2, &_usrstack, &len, NULL, 0) == -1)
478 PANIC("Cannot get kern.usrstack from sysctl");
479 env_bigstack = getenv("LIBPTHREAD_BIGSTACK_MAIN");
480 env_splitstack = getenv("LIBPTHREAD_SPLITSTACK_MAIN");
481 if (env_bigstack != NULL || env_splitstack == NULL) {
482 if (getrlimit(RLIMIT_STACK, &rlim) == -1)
483 PANIC("Cannot get stack rlimit");
484 // XXX - _thr_stack_initial = rlim.rlim_cur;
485 }
486 len = sizeof(_thr_is_smp);
487 sysctlbyname("kern.smp.cpus", &_thr_is_smp, &len, NULL, 0);
488 _thr_is_smp = (_thr_is_smp > 1);
489 _thr_page_size = getpagesize();
490 _thr_guard_default = _thr_page_size;
491 _pthread_attr_default.guardsize_attr = _thr_guard_default;
492 _pthread_attr_default.stacksize_attr = THR_STACK_DEFAULT;
493 env = getenv("LIBPTHREAD_SPINLOOPS");
494 if (env)
495 _thr_spinloops = atoi(env);
496 env = getenv("LIBPTHREAD_YIELDLOOPS");
497 if (env)
498 _thr_yieldloops = atoi(env);
499 env = getenv("LIBPTHREAD_QUEUE_FIFO");
500 if (env)
501 _thr_queuefifo = atoi(env);
502 TAILQ_INIT(&_thr_atfork_list);
503 }
504 init_once = 1;
505 }
506