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 "namespace.h"
37 #include <sys/param.h>
38 #include <sys/auxv.h>
39 #include <sys/signalvar.h>
40 #include <sys/ioctl.h>
41 #include <sys/link_elf.h>
42 #include <sys/resource.h>
43 #include <sys/sysctl.h>
44 #include <sys/ttycom.h>
45 #include <sys/mman.h>
46 #include <sys/rtprio.h>
47 #include <errno.h>
48 #include <fcntl.h>
49 #include <paths.h>
50 #include <pthread.h>
51 #include <pthread_np.h>
52 #include <signal.h>
53 #include <stdlib.h>
54 #include <string.h>
55 #include <time.h>
56 #include <unistd.h>
57 #include "un-namespace.h"
58
59 #include "libc_private.h"
60 #include "thr_private.h"
61
62 char *_usrstack;
63 struct pthread *_thr_initial;
64 int _libthr_debug;
65 int _thread_event_mask;
66 struct pthread *_thread_last_event;
67 pthreadlist _thread_list = TAILQ_HEAD_INITIALIZER(_thread_list);
68 pthreadlist _thread_gc_list = TAILQ_HEAD_INITIALIZER(_thread_gc_list);
69 int _thread_active_threads = 1;
70 atfork_head _thr_atfork_list = TAILQ_HEAD_INITIALIZER(_thr_atfork_list);
71 struct urwlock _thr_atfork_lock = DEFAULT_URWLOCK;
72
73 struct pthread_prio _thr_priorities[3] = {
74 {RTP_PRIO_MIN, RTP_PRIO_MAX, 0}, /* FIFO */
75 {0, 0, 63}, /* OTHER */
76 {RTP_PRIO_MIN, RTP_PRIO_MAX, 0} /* RR */
77 };
78
79 struct pthread_attr _pthread_attr_default = {
80 .sched_policy = SCHED_OTHER,
81 .sched_inherit = PTHREAD_INHERIT_SCHED,
82 .prio = 0,
83 .suspend = THR_CREATE_RUNNING,
84 .flags = PTHREAD_SCOPE_SYSTEM,
85 .stackaddr_attr = NULL,
86 .stacksize_attr = THR_STACK_DEFAULT,
87 .guardsize_attr = 0,
88 .cpusetsize = 0,
89 .cpuset = NULL
90 };
91
92 struct pthread_mutex_attr _pthread_mutexattr_default = {
93 .m_type = PTHREAD_MUTEX_DEFAULT,
94 .m_protocol = PTHREAD_PRIO_NONE,
95 .m_ceiling = 0,
96 .m_pshared = PTHREAD_PROCESS_PRIVATE,
97 .m_robust = PTHREAD_MUTEX_STALLED,
98 };
99
100 struct pthread_mutex_attr _pthread_mutexattr_adaptive_default = {
101 .m_type = PTHREAD_MUTEX_ADAPTIVE_NP,
102 .m_protocol = PTHREAD_PRIO_NONE,
103 .m_ceiling = 0,
104 .m_pshared = PTHREAD_PROCESS_PRIVATE,
105 .m_robust = PTHREAD_MUTEX_STALLED,
106 };
107
108 /* Default condition variable attributes: */
109 struct pthread_cond_attr _pthread_condattr_default = {
110 .c_pshared = PTHREAD_PROCESS_PRIVATE,
111 .c_clockid = CLOCK_REALTIME
112 };
113
114 int _thr_is_smp = 0;
115 size_t _thr_guard_default;
116 size_t _thr_stack_default = THR_STACK_DEFAULT;
117 size_t _thr_stack_initial = THR_STACK_INITIAL;
118 int _thr_page_size;
119 int _thr_spinloops;
120 int _thr_yieldloops;
121 int _thr_queuefifo = 4;
122 int _gc_count;
123 struct umutex _mutex_static_lock = DEFAULT_UMUTEX;
124 struct umutex _cond_static_lock = DEFAULT_UMUTEX;
125 struct umutex _rwlock_static_lock = DEFAULT_UMUTEX;
126 struct umutex _keytable_lock = DEFAULT_UMUTEX;
127 struct urwlock _thr_list_lock = DEFAULT_URWLOCK;
128 struct umutex _thr_event_lock = DEFAULT_UMUTEX;
129 struct umutex _suspend_all_lock = DEFAULT_UMUTEX;
130 struct pthread *_single_thread;
131 int _suspend_all_cycle;
132 int _suspend_all_waiters;
133
134 int __pthread_cond_wait(pthread_cond_t *, pthread_mutex_t *);
135 int __pthread_mutex_lock(pthread_mutex_t *);
136 int __pthread_mutex_trylock(pthread_mutex_t *);
137 void _thread_init_hack(void) __attribute__ ((constructor));
138
139 static void init_private(void);
140 static void init_main_thread(struct pthread *thread);
141
142 /*
143 * All weak references used within libc should be in this table.
144 * This is so that static libraries will work.
145 */
146
147 STATIC_LIB_REQUIRE(_fork);
148 STATIC_LIB_REQUIRE(_pthread_getspecific);
149 STATIC_LIB_REQUIRE(_pthread_key_create);
150 STATIC_LIB_REQUIRE(_pthread_key_delete);
151 STATIC_LIB_REQUIRE(_pthread_mutex_destroy);
152 STATIC_LIB_REQUIRE(_pthread_mutex_init);
153 STATIC_LIB_REQUIRE(_pthread_mutex_lock);
154 STATIC_LIB_REQUIRE(_pthread_mutex_trylock);
155 STATIC_LIB_REQUIRE(_pthread_mutex_unlock);
156 STATIC_LIB_REQUIRE(_pthread_mutexattr_init);
157 STATIC_LIB_REQUIRE(_pthread_mutexattr_destroy);
158 STATIC_LIB_REQUIRE(_pthread_mutexattr_settype);
159 STATIC_LIB_REQUIRE(_pthread_once);
160 STATIC_LIB_REQUIRE(_pthread_setspecific);
161 STATIC_LIB_REQUIRE(_raise);
162 STATIC_LIB_REQUIRE(_sem_destroy);
163 STATIC_LIB_REQUIRE(_sem_getvalue);
164 STATIC_LIB_REQUIRE(_sem_init);
165 STATIC_LIB_REQUIRE(_sem_post);
166 STATIC_LIB_REQUIRE(_sem_timedwait);
167 STATIC_LIB_REQUIRE(_sem_trywait);
168 STATIC_LIB_REQUIRE(_sem_wait);
169 STATIC_LIB_REQUIRE(_sigaction);
170 STATIC_LIB_REQUIRE(_sigprocmask);
171 STATIC_LIB_REQUIRE(_sigsuspend);
172 STATIC_LIB_REQUIRE(_sigtimedwait);
173 STATIC_LIB_REQUIRE(_sigwait);
174 STATIC_LIB_REQUIRE(_sigwaitinfo);
175 STATIC_LIB_REQUIRE(_spinlock);
176 STATIC_LIB_REQUIRE(_spinunlock);
177 STATIC_LIB_REQUIRE(_thread_init_hack);
178
179 /*
180 * These are needed when linking statically. All references within
181 * libgcc (and in the future libc) to these routines are weak, but
182 * if they are not (strongly) referenced by the application or other
183 * libraries, then the actual functions will not be loaded.
184 */
185 STATIC_LIB_REQUIRE(_pthread_once);
186 STATIC_LIB_REQUIRE(_pthread_key_create);
187 STATIC_LIB_REQUIRE(_pthread_key_delete);
188 STATIC_LIB_REQUIRE(_pthread_getspecific);
189 STATIC_LIB_REQUIRE(_pthread_setspecific);
190 STATIC_LIB_REQUIRE(_pthread_mutex_init);
191 STATIC_LIB_REQUIRE(_pthread_mutex_destroy);
192 STATIC_LIB_REQUIRE(_pthread_mutex_lock);
193 STATIC_LIB_REQUIRE(_pthread_mutex_trylock);
194 STATIC_LIB_REQUIRE(_pthread_mutex_unlock);
195 STATIC_LIB_REQUIRE(_pthread_create);
196
197 /* Pull in all symbols required by libthread_db */
198 STATIC_LIB_REQUIRE(_thread_state_running);
199
200 #define DUAL_ENTRY(entry) \
201 (pthread_func_t)entry, (pthread_func_t)entry
202
203 static pthread_func_t jmp_table[][2] = {
204 [PJT_ATFORK] = {DUAL_ENTRY(_thr_atfork)},
205 [PJT_ATTR_DESTROY] = {DUAL_ENTRY(_thr_attr_destroy)},
206 [PJT_ATTR_GETDETACHSTATE] = {DUAL_ENTRY(_thr_attr_getdetachstate)},
207 [PJT_ATTR_GETGUARDSIZE] = {DUAL_ENTRY(_thr_attr_getguardsize)},
208 [PJT_ATTR_GETINHERITSCHED] = {DUAL_ENTRY(_thr_attr_getinheritsched)},
209 [PJT_ATTR_GETSCHEDPARAM] = {DUAL_ENTRY(_thr_attr_getschedparam)},
210 [PJT_ATTR_GETSCHEDPOLICY] = {DUAL_ENTRY(_thr_attr_getschedpolicy)},
211 [PJT_ATTR_GETSCOPE] = {DUAL_ENTRY(_thr_attr_getscope)},
212 [PJT_ATTR_GETSTACKADDR] = {DUAL_ENTRY(_thr_attr_getstackaddr)},
213 [PJT_ATTR_GETSTACKSIZE] = {DUAL_ENTRY(_thr_attr_getstacksize)},
214 [PJT_ATTR_INIT] = {DUAL_ENTRY(_thr_attr_init)},
215 [PJT_ATTR_SETDETACHSTATE] = {DUAL_ENTRY(_thr_attr_setdetachstate)},
216 [PJT_ATTR_SETGUARDSIZE] = {DUAL_ENTRY(_thr_attr_setguardsize)},
217 [PJT_ATTR_SETINHERITSCHED] = {DUAL_ENTRY(_thr_attr_setinheritsched)},
218 [PJT_ATTR_SETSCHEDPARAM] = {DUAL_ENTRY(_thr_attr_setschedparam)},
219 [PJT_ATTR_SETSCHEDPOLICY] = {DUAL_ENTRY(_thr_attr_setschedpolicy)},
220 [PJT_ATTR_SETSCOPE] = {DUAL_ENTRY(_thr_attr_setscope)},
221 [PJT_ATTR_SETSTACKADDR] = {DUAL_ENTRY(_thr_attr_setstackaddr)},
222 [PJT_ATTR_SETSTACKSIZE] = {DUAL_ENTRY(_thr_attr_setstacksize)},
223 [PJT_CANCEL] = {DUAL_ENTRY(_thr_cancel)},
224 [PJT_CLEANUP_POP] = {DUAL_ENTRY(_thr_cleanup_pop)},
225 [PJT_CLEANUP_PUSH] = {DUAL_ENTRY(_thr_cleanup_push)},
226 [PJT_COND_BROADCAST] = {DUAL_ENTRY(_thr_cond_broadcast)},
227 [PJT_COND_DESTROY] = {DUAL_ENTRY(_thr_cond_destroy)},
228 [PJT_COND_INIT] = {DUAL_ENTRY(_thr_cond_init)},
229 [PJT_COND_SIGNAL] = {DUAL_ENTRY(_thr_cond_signal)},
230 [PJT_COND_TIMEDWAIT] = {DUAL_ENTRY(_thr_cond_timedwait)},
231 [PJT_COND_WAIT] = {(pthread_func_t)__thr_cond_wait,
232 (pthread_func_t)_thr_cond_wait},
233 [PJT_DETACH] = {DUAL_ENTRY(_thr_detach)},
234 [PJT_EQUAL] = {DUAL_ENTRY(_thr_equal)},
235 [PJT_EXIT] = {DUAL_ENTRY(_Tthr_exit)},
236 [PJT_GETSPECIFIC] = {DUAL_ENTRY(_thr_getspecific)},
237 [PJT_JOIN] = {DUAL_ENTRY(_thr_join)},
238 [PJT_KEY_CREATE] = {DUAL_ENTRY(_thr_key_create)},
239 [PJT_KEY_DELETE] = {DUAL_ENTRY(_thr_key_delete)},
240 [PJT_KILL] = {DUAL_ENTRY(_Tthr_kill)},
241 [PJT_MAIN_NP] = {DUAL_ENTRY(_thr_main_np)},
242 [PJT_MUTEXATTR_DESTROY] = {DUAL_ENTRY(_thr_mutexattr_destroy)},
243 [PJT_MUTEXATTR_INIT] = {DUAL_ENTRY(_thr_mutexattr_init)},
244 [PJT_MUTEXATTR_SETTYPE] = {DUAL_ENTRY(_thr_mutexattr_settype)},
245 [PJT_MUTEX_DESTROY] = {DUAL_ENTRY(_thr_mutex_destroy)},
246 [PJT_MUTEX_INIT] = {DUAL_ENTRY(__Tthr_mutex_init)},
247 [PJT_MUTEX_LOCK] = {DUAL_ENTRY(__Tthr_mutex_lock)},
248 [PJT_MUTEX_TRYLOCK] = {DUAL_ENTRY(__Tthr_mutex_trylock)},
249 [PJT_MUTEX_UNLOCK] = {DUAL_ENTRY(_thr_mutex_unlock)},
250 [PJT_ONCE] = {DUAL_ENTRY(_thr_once)},
251 [PJT_RWLOCK_DESTROY] = {DUAL_ENTRY(_thr_rwlock_destroy)},
252 [PJT_RWLOCK_INIT] = {DUAL_ENTRY(_thr_rwlock_init)},
253 [PJT_RWLOCK_RDLOCK] = {DUAL_ENTRY(_Tthr_rwlock_rdlock)},
254 [PJT_RWLOCK_TRYRDLOCK] = {DUAL_ENTRY(_Tthr_rwlock_tryrdlock)},
255 [PJT_RWLOCK_TRYWRLOCK] = {DUAL_ENTRY(_Tthr_rwlock_trywrlock)},
256 [PJT_RWLOCK_UNLOCK] = {DUAL_ENTRY(_Tthr_rwlock_unlock)},
257 [PJT_RWLOCK_WRLOCK] = {DUAL_ENTRY(_Tthr_rwlock_wrlock)},
258 [PJT_SELF] = {DUAL_ENTRY(_Tthr_self)},
259 [PJT_SETCANCELSTATE] = {DUAL_ENTRY(_thr_setcancelstate)},
260 [PJT_SETCANCELTYPE] = {DUAL_ENTRY(_thr_setcanceltype)},
261 [PJT_SETSPECIFIC] = {DUAL_ENTRY(_thr_setspecific)},
262 [PJT_SIGMASK] = {DUAL_ENTRY(_thr_sigmask)},
263 [PJT_TESTCANCEL] = {DUAL_ENTRY(_Tthr_testcancel)},
264 [PJT_CLEANUP_POP_IMP] = {DUAL_ENTRY(__thr_cleanup_pop_imp)},
265 [PJT_CLEANUP_PUSH_IMP] = {DUAL_ENTRY(__thr_cleanup_push_imp)},
266 [PJT_CANCEL_ENTER] = {DUAL_ENTRY(_Tthr_cancel_enter)},
267 [PJT_CANCEL_LEAVE] = {DUAL_ENTRY(_Tthr_cancel_leave)},
268 [PJT_MUTEX_CONSISTENT] = {DUAL_ENTRY(_Tthr_mutex_consistent)},
269 [PJT_MUTEXATTR_GETROBUST] = {DUAL_ENTRY(_thr_mutexattr_getrobust)},
270 [PJT_MUTEXATTR_SETROBUST] = {DUAL_ENTRY(_thr_mutexattr_setrobust)},
271 [PJT_GETTHREADID_NP] = {DUAL_ENTRY(_thr_getthreadid_np)},
272 [PJT_ATTR_GET_NP] = {DUAL_ENTRY(_thr_attr_get_np)},
273 [PJT_GETNAME_NP] = {DUAL_ENTRY(_thr_getname_np)},
274 [PJT_SUSPEND_ALL_NP] = {DUAL_ENTRY(_thr_suspend_all_np)},
275 [PJT_RESUME_ALL_NP] = {DUAL_ENTRY(_thr_resume_all_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
_thread_init_hack(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
_libpthread_init(struct pthread * curthread)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 /* Force _get_curthread() return NULL until set. */
338 _tcb_get()->tcb_thread = NULL;
339 /* Create and initialize the initial thread. */
340 curthread = _thr_alloc(NULL);
341 if (curthread == NULL)
342 PANIC("Can't allocate initial thread");
343 init_main_thread(curthread);
344 } else {
345 first = 0;
346 }
347
348 /*
349 * Add the thread to the thread list queue.
350 */
351 THR_LIST_ADD(curthread);
352 _thread_active_threads = 1;
353
354 /* Setup the thread specific data */
355 _tcb_set(curthread->tcb);
356
357 if (first) {
358 _thr_initial = curthread;
359 dlopened = _rtld_is_dlopened(&_thread_autoinit_dummy_decl) != 0;
360 _thr_signal_init(dlopened);
361 if (_thread_event_mask & TD_CREATE)
362 _thr_report_creation(curthread, curthread);
363 /*
364 * Always use our rtld lock implementation.
365 * It is faster because it postpones signal handlers
366 * instead of calling sigprocmask(2).
367 */
368 _thr_rtld_init();
369 }
370 }
371
372 /*
373 * This function and pthread_create() do a lot of the same things.
374 * It'd be nice to consolidate the common stuff in one place.
375 */
376 static void
init_main_thread(struct pthread * thread)377 init_main_thread(struct pthread *thread)
378 {
379 struct sched_param sched_param;
380 int i;
381
382 /* Setup the thread attributes. */
383 thr_self(&thread->tid);
384 thread->attr = _pthread_attr_default;
385 /*
386 * Set up the thread stack.
387 *
388 * Create a red zone below the main stack. All other stacks
389 * are constrained to a maximum size by the parameters
390 * passed to mmap(), but this stack is only limited by
391 * resource limits, so this stack needs an explicitly mapped
392 * red zone to protect the thread stack that is just beyond.
393 */
394 if (mmap(_usrstack - _thr_stack_initial -
395 _thr_guard_default, _thr_guard_default, 0, MAP_ANON,
396 -1, 0) == MAP_FAILED)
397 PANIC("Cannot allocate red zone for initial thread");
398
399 /*
400 * Mark the stack as an application supplied stack so that it
401 * isn't deallocated.
402 *
403 * XXX - I'm not sure it would hurt anything to deallocate
404 * the main thread stack because deallocation doesn't
405 * actually free() it; it just puts it in the free
406 * stack queue for later reuse.
407 */
408 thread->attr.stackaddr_attr = _usrstack - _thr_stack_initial;
409 thread->attr.stacksize_attr = _thr_stack_initial;
410 thread->attr.guardsize_attr = _thr_guard_default;
411 thread->attr.flags |= THR_STACK_USER;
412
413 /*
414 * Write a magic value to the thread structure
415 * to help identify valid ones:
416 */
417 thread->magic = THR_MAGIC;
418
419 thread->cancel_enable = 1;
420 thread->cancel_async = 0;
421
422 /* Initialize the mutex queues */
423 for (i = 0; i < TMQ_NITEMS; i++)
424 TAILQ_INIT(&thread->mq[i]);
425
426 thread->state = PS_RUNNING;
427
428 _thr_getscheduler(thread->tid, &thread->attr.sched_policy,
429 &sched_param);
430 thread->attr.prio = sched_param.sched_priority;
431
432 #ifdef _PTHREAD_FORCED_UNWIND
433 thread->unwind_stackend = _usrstack;
434 #endif
435
436 /* Others cleared to zero by thr_alloc() */
437 }
438
439 bool
__thr_get_main_stack_base(char ** base)440 __thr_get_main_stack_base(char **base)
441 {
442 size_t len;
443 int mib[2];
444
445 if (elf_aux_info(AT_USRSTACKBASE, base, sizeof(*base)) == 0)
446 return (true);
447
448 mib[0] = CTL_KERN;
449 mib[1] = KERN_USRSTACK;
450 len = sizeof(*base);
451 if (sysctl(mib, nitems(mib), base, &len, NULL, 0) == 0)
452 return (true);
453
454 return (false);
455 }
456
457 bool
__thr_get_main_stack_lim(size_t * lim)458 __thr_get_main_stack_lim(size_t *lim)
459 {
460 struct rlimit rlim;
461
462 if (elf_aux_info(AT_USRSTACKLIM, lim, sizeof(*lim)) == 0)
463 return (true);
464
465 if (getrlimit(RLIMIT_STACK, &rlim) == 0) {
466 *lim = rlim.rlim_cur;
467 return (true);
468 }
469
470 return (false);
471 }
472
473 static void
init_private(void)474 init_private(void)
475 {
476 char *env, *env_bigstack, *env_splitstack;
477
478 _thr_umutex_init(&_mutex_static_lock);
479 _thr_umutex_init(&_cond_static_lock);
480 _thr_umutex_init(&_rwlock_static_lock);
481 _thr_umutex_init(&_keytable_lock);
482 _thr_urwlock_init(&_thr_atfork_lock);
483 _thr_umutex_init(&_thr_event_lock);
484 _thr_umutex_init(&_suspend_all_lock);
485 _thr_spinlock_init();
486 _thr_list_init();
487 _thr_wake_addr_init();
488 _sleepq_init();
489 _single_thread = NULL;
490 _suspend_all_waiters = 0;
491
492 /*
493 * Avoid reinitializing some things if they don't need to be,
494 * e.g. after a fork().
495 */
496 if (init_once == 0) {
497 __thr_pshared_init();
498 __thr_malloc_init();
499
500 /* Find the stack top */
501 if (!__thr_get_main_stack_base(&_usrstack))
502 PANIC("Cannot get kern.usrstack");
503 env_bigstack = getenv("LIBPTHREAD_BIGSTACK_MAIN");
504 env_splitstack = getenv("LIBPTHREAD_SPLITSTACK_MAIN");
505 if (env_bigstack != NULL || env_splitstack == NULL) {
506 if (!__thr_get_main_stack_lim(&_thr_stack_initial))
507 PANIC("Cannot get stack rlimit");
508 }
509 _thr_is_smp = sysconf(_SC_NPROCESSORS_CONF);
510 if (_thr_is_smp == -1)
511 PANIC("Cannot get _SC_NPROCESSORS_CONF");
512 _thr_is_smp = (_thr_is_smp > 1);
513 _thr_page_size = getpagesize();
514 _thr_guard_default = _thr_page_size;
515 _pthread_attr_default.guardsize_attr = _thr_guard_default;
516 _pthread_attr_default.stacksize_attr = _thr_stack_default;
517 env = getenv("LIBPTHREAD_SPINLOOPS");
518 if (env)
519 _thr_spinloops = atoi(env);
520 env = getenv("LIBPTHREAD_YIELDLOOPS");
521 if (env)
522 _thr_yieldloops = atoi(env);
523 env = getenv("LIBPTHREAD_QUEUE_FIFO");
524 if (env)
525 _thr_queuefifo = atoi(env);
526 env = getenv("LIBPTHREAD_UMTX_MIN_TIMEOUT");
527 if (env) {
528 char *endptr;
529 long mint;
530
531 mint = strtol(env, &endptr, 0);
532 if (*endptr == '\0' && mint >= 0) {
533 _umtx_op(NULL, UMTX_OP_SET_MIN_TIMEOUT,
534 mint, NULL, NULL);
535 }
536 }
537 }
538 init_once = 1;
539 }
540