libstdc++
gthr-posix.h
1 /* Threads compatibility routines for libgcc2 and libobjc. */
2 /* Compile this one with gcc. */
3 /* Copyright (C) 1997, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
4  2008, 2009, 2010 Free Software Foundation, Inc.
5 
6 This file is part of GCC.
7 
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
11 version.
12 
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 for more details.
17 
18 Under Section 7 of GPL version 3, you are granted additional
19 permissions described in the GCC Runtime Library Exception, version
20 3.1, as published by the Free Software Foundation.
21 
22 You should have received a copy of the GNU General Public License and
23 a copy of the GCC Runtime Library Exception along with this program;
24 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
25 <http://www.gnu.org/licenses/>. */
26 
27 #ifndef _GLIBCXX_GCC_GTHR_POSIX_H
28 #define _GLIBCXX_GCC_GTHR_POSIX_H
29 
30 /* POSIX threads specific definitions.
31  Easy, since the interface is just one-to-one mapping. */
32 
33 #define __GTHREADS 1
34 #define __GTHREADS_CXX0X 1
35 
36 /* Some implementations of <pthread.h> require this to be defined. */
37 #if !defined(_REENTRANT) && defined(__osf__)
38 #define _REENTRANT 1
39 #endif
40 
41 #include <pthread.h>
42 #include <unistd.h>
43 
44 typedef pthread_t __gthread_t;
45 typedef pthread_key_t __gthread_key_t;
46 typedef pthread_once_t __gthread_once_t;
47 typedef pthread_mutex_t __gthread_mutex_t;
48 typedef pthread_mutex_t __gthread_recursive_mutex_t;
49 typedef pthread_cond_t __gthread_cond_t;
50 typedef struct timespec __gthread_time_t;
51 
52 /* POSIX like conditional variables are supported. Please look at comments
53  in gthr.h for details. */
54 #define __GTHREAD_HAS_COND 1
55 
56 #define __GTHREAD_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER
57 #define __GTHREAD_ONCE_INIT PTHREAD_ONCE_INIT
58 #if defined(PTHREAD_RECURSIVE_MUTEX_INITIALIZER)
59 #define __GTHREAD_RECURSIVE_MUTEX_INIT PTHREAD_RECURSIVE_MUTEX_INITIALIZER
60 #elif defined(PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP)
61 #define __GTHREAD_RECURSIVE_MUTEX_INIT PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP
62 #else
63 #define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function
64 #endif
65 #define __GTHREAD_COND_INIT PTHREAD_COND_INITIALIZER
66 #define __GTHREAD_TIME_INIT {0,0}
67 
68 #if __GXX_WEAK__ && _GLIBCXX_GTHREAD_USE_WEAK
69 # ifndef __gthrw_pragma
70 # define __gthrw_pragma(pragma)
71 # endif
72 # define __gthrw2(name,name2,type) \
73  static __typeof(type) name __attribute__ ((__weakref__(#name2))); \
74  __gthrw_pragma(weak type)
75 # define __gthrw_(name) __gthrw_ ## name
76 #else
77 # define __gthrw2(name,name2,type)
78 # define __gthrw_(name) name
79 #endif
80 
81 /* Typically, __gthrw_foo is a weak reference to symbol foo. */
82 #define __gthrw(name) __gthrw2(__gthrw_ ## name,name,name)
83 
84 /* On Tru64, /usr/include/pthread.h uses #pragma extern_prefix "__" to
85  map a subset of the POSIX pthread API to mangled versions of their
86  names. */
87 #if defined(__osf__) && defined(_PTHREAD_USE_MANGLED_NAMES_)
88 #define __gthrw3(name) __gthrw2(__gthrw_ ## name, __ ## name, name)
89 __gthrw3(pthread_once)
90 __gthrw3(pthread_getspecific)
91 __gthrw3(pthread_setspecific)
92 
93 __gthrw3(pthread_create)
94 __gthrw3(pthread_join)
95 __gthrw3(pthread_detach)
96 __gthrw3(pthread_equal)
97 __gthrw3(pthread_self)
98 __gthrw3(pthread_cancel)
99 __gthrw3(sched_yield)
100 
101 __gthrw3(pthread_mutex_lock)
102 __gthrw3(pthread_mutex_trylock)
103 #ifdef _POSIX_TIMEOUTS
104 #if _POSIX_TIMEOUTS >= 0
105 __gthrw3(pthread_mutex_timedlock)
106 #endif
107 #endif /* _POSIX_TIMEOUTS */
108 __gthrw3(pthread_mutex_unlock)
109 __gthrw3(pthread_mutex_init)
110 __gthrw3(pthread_mutex_destroy)
111 
112 __gthrw3(pthread_cond_broadcast)
113 __gthrw3(pthread_cond_signal)
114 __gthrw3(pthread_cond_wait)
115 __gthrw3(pthread_cond_timedwait)
116 __gthrw3(pthread_cond_destroy)
117 #else
118 __gthrw(pthread_once)
119 __gthrw(pthread_getspecific)
120 __gthrw(pthread_setspecific)
121 
122 __gthrw(pthread_create)
123 __gthrw(pthread_join)
124 __gthrw(pthread_equal)
125 __gthrw(pthread_self)
126 __gthrw(pthread_detach)
127 #ifndef __BIONIC__
128 __gthrw(pthread_cancel)
129 #endif
130 __gthrw(sched_yield)
131 
132 __gthrw(pthread_mutex_lock)
133 __gthrw(pthread_mutex_trylock)
134 #ifdef _POSIX_TIMEOUTS
135 #if _POSIX_TIMEOUTS >= 0
136 __gthrw(pthread_mutex_timedlock)
137 #endif
138 #endif /* _POSIX_TIMEOUTS */
139 __gthrw(pthread_mutex_unlock)
140 __gthrw(pthread_mutex_init)
141 __gthrw(pthread_mutex_destroy)
142 
143 __gthrw(pthread_cond_broadcast)
144 __gthrw(pthread_cond_signal)
145 __gthrw(pthread_cond_wait)
146 __gthrw(pthread_cond_timedwait)
147 __gthrw(pthread_cond_destroy)
148 #endif
149 
150 __gthrw(pthread_key_create)
151 __gthrw(pthread_key_delete)
152 __gthrw(pthread_mutexattr_init)
153 __gthrw(pthread_mutexattr_settype)
154 __gthrw(pthread_mutexattr_destroy)
155 
156 
157 #if defined(_LIBOBJC) || defined(_LIBOBJC_WEAK)
158 /* Objective-C. */
159 #if defined(__osf__) && defined(_PTHREAD_USE_MANGLED_NAMES_)
160 __gthrw3(pthread_cond_init)
161 __gthrw3(pthread_exit)
162 #else
163 __gthrw(pthread_cond_init)
164 __gthrw(pthread_exit)
165 #endif /* __osf__ && _PTHREAD_USE_MANGLED_NAMES_ */
166 #ifdef _POSIX_PRIORITY_SCHEDULING
167 #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
168 __gthrw(sched_get_priority_max)
169 __gthrw(sched_get_priority_min)
170 #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
171 #endif /* _POSIX_PRIORITY_SCHEDULING */
172 __gthrw(pthread_attr_destroy)
173 __gthrw(pthread_attr_init)
174 __gthrw(pthread_attr_setdetachstate)
175 #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
176 __gthrw(pthread_getschedparam)
177 __gthrw(pthread_setschedparam)
178 #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
179 #endif /* _LIBOBJC || _LIBOBJC_WEAK */
180 
181 #if __GXX_WEAK__ && _GLIBCXX_GTHREAD_USE_WEAK
182 
183 /* On Solaris 2.6 up to 9, the libc exposes a POSIX threads interface even if
184  -pthreads is not specified. The functions are dummies and most return an
185  error value. However pthread_once returns 0 without invoking the routine
186  it is passed so we cannot pretend that the interface is active if -pthreads
187  is not specified. On Solaris 2.5.1, the interface is not exposed at all so
188  we need to play the usual game with weak symbols. On Solaris 10 and up, a
189  working interface is always exposed. On FreeBSD 6 and later, libc also
190  exposes a dummy POSIX threads interface, similar to what Solaris 2.6 up
191  to 9 does. FreeBSD >= 700014 even provides a pthread_cancel stub in libc,
192  which means the alternate __gthread_active_p below cannot be used there. */
193 
194 #if defined(__FreeBSD__) || (defined(__sun) && defined(__svr4__))
195 
196 static volatile int __gthread_active = -1;
197 
198 static void
199 __gthread_trigger (void)
200 {
201  __gthread_active = 1;
202 }
203 
204 static inline int
205 __gthread_active_p (void)
206 {
207  static pthread_mutex_t __gthread_active_mutex = PTHREAD_MUTEX_INITIALIZER;
208  static pthread_once_t __gthread_active_once = PTHREAD_ONCE_INIT;
209 
210  /* Avoid reading __gthread_active twice on the main code path. */
211  int __gthread_active_latest_value = __gthread_active;
212 
213  /* This test is not protected to avoid taking a lock on the main code
214  path so every update of __gthread_active in a threaded program must
215  be atomic with regard to the result of the test. */
216  if (__builtin_expect (__gthread_active_latest_value < 0, 0))
217  {
218  if (__gthrw_(pthread_once))
219  {
220  /* If this really is a threaded program, then we must ensure that
221  __gthread_active has been set to 1 before exiting this block. */
222  __gthrw_(pthread_mutex_lock) (&__gthread_active_mutex);
223  __gthrw_(pthread_once) (&__gthread_active_once, __gthread_trigger);
224  __gthrw_(pthread_mutex_unlock) (&__gthread_active_mutex);
225  }
226 
227  /* Make sure we'll never enter this block again. */
228  if (__gthread_active < 0)
229  __gthread_active = 0;
230 
231  __gthread_active_latest_value = __gthread_active;
232  }
233 
234  return __gthread_active_latest_value != 0;
235 }
236 
237 #else /* neither FreeBSD nor Solaris */
238 
239 static inline int
240 __gthread_active_p (void)
241 {
242 /* Android's C library does not provide pthread_cancel, check for
243  `pthread_create' instead. */
244 #ifndef __BIONIC__
245  static void *const __gthread_active_ptr
246  = __extension__ (void *) &__gthrw_(pthread_cancel);
247 #else
248  static void *const __gthread_active_ptr
249  = __extension__ (void *) &__gthrw_(pthread_create);
250 #endif
251  return __gthread_active_ptr != 0;
252 }
253 
254 #endif /* FreeBSD or Solaris */
255 
256 #else /* not __GXX_WEAK__ */
257 
258 /* Similar to Solaris, HP-UX 11 for PA-RISC provides stubs for pthread
259  calls in shared flavors of the HP-UX C library. Most of the stubs
260  have no functionality. The details are described in the "libc cumulative
261  patch" for each subversion of HP-UX 11. There are two special interfaces
262  provided for checking whether an application is linked to a shared pthread
263  library or not. However, these interfaces aren't available in early
264  libpthread libraries. We also need a test that works for archive
265  libraries. We can't use pthread_once as some libc versions call the
266  init function. We also can't use pthread_create or pthread_attr_init
267  as these create a thread and thereby prevent changing the default stack
268  size. The function pthread_default_stacksize_np is available in both
269  the archive and shared versions of libpthread. It can be used to
270  determine the default pthread stack size. There is a stub in some
271  shared libc versions which returns a zero size if pthreads are not
272  active. We provide an equivalent stub to handle cases where libc
273  doesn't provide one. */
274 
275 #if defined(__hppa__) && defined(__hpux__)
276 
277 static volatile int __gthread_active = -1;
278 
279 static inline int
280 __gthread_active_p (void)
281 {
282  /* Avoid reading __gthread_active twice on the main code path. */
283  int __gthread_active_latest_value = __gthread_active;
284  size_t __s;
285 
286  if (__builtin_expect (__gthread_active_latest_value < 0, 0))
287  {
288  pthread_default_stacksize_np (0, &__s);
289  __gthread_active = __s ? 1 : 0;
290  __gthread_active_latest_value = __gthread_active;
291  }
292 
293  return __gthread_active_latest_value != 0;
294 }
295 
296 #else /* not hppa-hpux */
297 
298 static inline int
299 __gthread_active_p (void)
300 {
301  return 1;
302 }
303 
304 #endif /* hppa-hpux */
305 
306 #endif /* __GXX_WEAK__ */
307 
308 #ifdef _LIBOBJC
309 
310 /* This is the config.h file in libobjc/ */
311 #include <config.h>
312 
313 #ifdef HAVE_SCHED_H
314 # include <sched.h>
315 #endif
316 
317 /* Key structure for maintaining thread specific storage */
318 static pthread_key_t _objc_thread_storage;
319 static pthread_attr_t _objc_thread_attribs;
320 
321 /* Thread local storage for a single thread */
322 static void *thread_local_storage = NULL;
323 
324 /* Backend initialization functions */
325 
326 /* Initialize the threads subsystem. */
327 static inline int
328 __gthread_objc_init_thread_system (void)
329 {
330  if (__gthread_active_p ())
331  {
332  /* Initialize the thread storage key. */
333  if (__gthrw_(pthread_key_create) (&_objc_thread_storage, NULL) == 0)
334  {
335  /* The normal default detach state for threads is
336  * PTHREAD_CREATE_JOINABLE which causes threads to not die
337  * when you think they should. */
338  if (__gthrw_(pthread_attr_init) (&_objc_thread_attribs) == 0
339  && __gthrw_(pthread_attr_setdetachstate) (&_objc_thread_attribs,
340  PTHREAD_CREATE_DETACHED) == 0)
341  return 0;
342  }
343  }
344 
345  return -1;
346 }
347 
348 /* Close the threads subsystem. */
349 static inline int
350 __gthread_objc_close_thread_system (void)
351 {
352  if (__gthread_active_p ()
353  && __gthrw_(pthread_key_delete) (_objc_thread_storage) == 0
354  && __gthrw_(pthread_attr_destroy) (&_objc_thread_attribs) == 0)
355  return 0;
356 
357  return -1;
358 }
359 
360 /* Backend thread functions */
361 
362 /* Create a new thread of execution. */
363 static inline objc_thread_t
364 __gthread_objc_thread_detach (void (*func)(void *), void *arg)
365 {
366  objc_thread_t thread_id;
367  pthread_t new_thread_handle;
368 
369  if (!__gthread_active_p ())
370  return NULL;
371 
372  if (!(__gthrw_(pthread_create) (&new_thread_handle, &_objc_thread_attribs,
373  (void *) func, arg)))
374  thread_id = (objc_thread_t) new_thread_handle;
375  else
376  thread_id = NULL;
377 
378  return thread_id;
379 }
380 
381 /* Set the current thread's priority. */
382 static inline int
383 __gthread_objc_thread_set_priority (int priority)
384 {
385  if (!__gthread_active_p ())
386  return -1;
387  else
388  {
389 #ifdef _POSIX_PRIORITY_SCHEDULING
390 #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
391  pthread_t thread_id = __gthrw_(pthread_self) ();
392  int policy;
393  struct sched_param params;
394  int priority_min, priority_max;
395 
396  if (__gthrw_(pthread_getschedparam) (thread_id, &policy, &params) == 0)
397  {
398  if ((priority_max = __gthrw_(sched_get_priority_max) (policy)) == -1)
399  return -1;
400 
401  if ((priority_min = __gthrw_(sched_get_priority_min) (policy)) == -1)
402  return -1;
403 
404  if (priority > priority_max)
405  priority = priority_max;
406  else if (priority < priority_min)
407  priority = priority_min;
408  params.sched_priority = priority;
409 
410  /*
411  * The solaris 7 and several other man pages incorrectly state that
412  * this should be a pointer to policy but pthread.h is universally
413  * at odds with this.
414  */
415  if (__gthrw_(pthread_setschedparam) (thread_id, policy, &params) == 0)
416  return 0;
417  }
418 #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
419 #endif /* _POSIX_PRIORITY_SCHEDULING */
420  return -1;
421  }
422 }
423 
424 /* Return the current thread's priority. */
425 static inline int
426 __gthread_objc_thread_get_priority (void)
427 {
428 #ifdef _POSIX_PRIORITY_SCHEDULING
429 #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
430  if (__gthread_active_p ())
431  {
432  int policy;
433  struct sched_param params;
434 
435  if (__gthrw_(pthread_getschedparam) (__gthrw_(pthread_self) (), &policy, &params) == 0)
436  return params.sched_priority;
437  else
438  return -1;
439  }
440  else
441 #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
442 #endif /* _POSIX_PRIORITY_SCHEDULING */
443  return OBJC_THREAD_INTERACTIVE_PRIORITY;
444 }
445 
446 /* Yield our process time to another thread. */
447 static inline void
448 __gthread_objc_thread_yield (void)
449 {
450  if (__gthread_active_p ())
451  __gthrw_(sched_yield) ();
452 }
453 
454 /* Terminate the current thread. */
455 static inline int
456 __gthread_objc_thread_exit (void)
457 {
458  if (__gthread_active_p ())
459  /* exit the thread */
460  __gthrw_(pthread_exit) (&__objc_thread_exit_status);
461 
462  /* Failed if we reached here */
463  return -1;
464 }
465 
466 /* Returns an integer value which uniquely describes a thread. */
467 static inline objc_thread_t
468 __gthread_objc_thread_id (void)
469 {
470  if (__gthread_active_p ())
471  return (objc_thread_t) __gthrw_(pthread_self) ();
472  else
473  return (objc_thread_t) 1;
474 }
475 
476 /* Sets the thread's local storage pointer. */
477 static inline int
478 __gthread_objc_thread_set_data (void *value)
479 {
480  if (__gthread_active_p ())
481  return __gthrw_(pthread_setspecific) (_objc_thread_storage, value);
482  else
483  {
484  thread_local_storage = value;
485  return 0;
486  }
487 }
488 
489 /* Returns the thread's local storage pointer. */
490 static inline void *
491 __gthread_objc_thread_get_data (void)
492 {
493  if (__gthread_active_p ())
494  return __gthrw_(pthread_getspecific) (_objc_thread_storage);
495  else
496  return thread_local_storage;
497 }
498 
499 /* Backend mutex functions */
500 
501 /* Allocate a mutex. */
502 static inline int
503 __gthread_objc_mutex_allocate (objc_mutex_t mutex)
504 {
505  if (__gthread_active_p ())
506  {
507  mutex->backend = objc_malloc (sizeof (pthread_mutex_t));
508 
509  if (__gthrw_(pthread_mutex_init) ((pthread_mutex_t *) mutex->backend, NULL))
510  {
511  objc_free (mutex->backend);
512  mutex->backend = NULL;
513  return -1;
514  }
515  }
516 
517  return 0;
518 }
519 
520 /* Deallocate a mutex. */
521 static inline int
522 __gthread_objc_mutex_deallocate (objc_mutex_t mutex)
523 {
524  if (__gthread_active_p ())
525  {
526  int count;
527 
528  /*
529  * Posix Threads specifically require that the thread be unlocked
530  * for __gthrw_(pthread_mutex_destroy) to work.
531  */
532 
533  do
534  {
535  count = __gthrw_(pthread_mutex_unlock) ((pthread_mutex_t *) mutex->backend);
536  if (count < 0)
537  return -1;
538  }
539  while (count);
540 
541  if (__gthrw_(pthread_mutex_destroy) ((pthread_mutex_t *) mutex->backend))
542  return -1;
543 
544  objc_free (mutex->backend);
545  mutex->backend = NULL;
546  }
547  return 0;
548 }
549 
550 /* Grab a lock on a mutex. */
551 static inline int
552 __gthread_objc_mutex_lock (objc_mutex_t mutex)
553 {
554  if (__gthread_active_p ()
555  && __gthrw_(pthread_mutex_lock) ((pthread_mutex_t *) mutex->backend) != 0)
556  {
557  return -1;
558  }
559 
560  return 0;
561 }
562 
563 /* Try to grab a lock on a mutex. */
564 static inline int
565 __gthread_objc_mutex_trylock (objc_mutex_t mutex)
566 {
567  if (__gthread_active_p ()
568  && __gthrw_(pthread_mutex_trylock) ((pthread_mutex_t *) mutex->backend) != 0)
569  {
570  return -1;
571  }
572 
573  return 0;
574 }
575 
576 /* Unlock the mutex */
577 static inline int
578 __gthread_objc_mutex_unlock (objc_mutex_t mutex)
579 {
580  if (__gthread_active_p ()
581  && __gthrw_(pthread_mutex_unlock) ((pthread_mutex_t *) mutex->backend) != 0)
582  {
583  return -1;
584  }
585 
586  return 0;
587 }
588 
589 /* Backend condition mutex functions */
590 
591 /* Allocate a condition. */
592 static inline int
593 __gthread_objc_condition_allocate (objc_condition_t condition)
594 {
595  if (__gthread_active_p ())
596  {
597  condition->backend = objc_malloc (sizeof (pthread_cond_t));
598 
599  if (__gthrw_(pthread_cond_init) ((pthread_cond_t *) condition->backend, NULL))
600  {
601  objc_free (condition->backend);
602  condition->backend = NULL;
603  return -1;
604  }
605  }
606 
607  return 0;
608 }
609 
610 /* Deallocate a condition. */
611 static inline int
612 __gthread_objc_condition_deallocate (objc_condition_t condition)
613 {
614  if (__gthread_active_p ())
615  {
616  if (__gthrw_(pthread_cond_destroy) ((pthread_cond_t *) condition->backend))
617  return -1;
618 
619  objc_free (condition->backend);
620  condition->backend = NULL;
621  }
622  return 0;
623 }
624 
625 /* Wait on the condition */
626 static inline int
627 __gthread_objc_condition_wait (objc_condition_t condition, objc_mutex_t mutex)
628 {
629  if (__gthread_active_p ())
630  return __gthrw_(pthread_cond_wait) ((pthread_cond_t *) condition->backend,
631  (pthread_mutex_t *) mutex->backend);
632  else
633  return 0;
634 }
635 
636 /* Wake up all threads waiting on this condition. */
637 static inline int
638 __gthread_objc_condition_broadcast (objc_condition_t condition)
639 {
640  if (__gthread_active_p ())
641  return __gthrw_(pthread_cond_broadcast) ((pthread_cond_t *) condition->backend);
642  else
643  return 0;
644 }
645 
646 /* Wake up one thread waiting on this condition. */
647 static inline int
648 __gthread_objc_condition_signal (objc_condition_t condition)
649 {
650  if (__gthread_active_p ())
651  return __gthrw_(pthread_cond_signal) ((pthread_cond_t *) condition->backend);
652  else
653  return 0;
654 }
655 
656 #else /* _LIBOBJC */
657 
658 static inline int
659 __gthread_create (__gthread_t *__threadid, void *(*__func) (void*),
660  void *__args)
661 {
662  return __gthrw_(pthread_create) (__threadid, NULL, __func, __args);
663 }
664 
665 static inline int
666 __gthread_join (__gthread_t __threadid, void **__value_ptr)
667 {
668  return __gthrw_(pthread_join) (__threadid, __value_ptr);
669 }
670 
671 static inline int
672 __gthread_detach (__gthread_t __threadid)
673 {
674  return __gthrw_(pthread_detach) (__threadid);
675 }
676 
677 static inline int
678 __gthread_equal (__gthread_t __t1, __gthread_t __t2)
679 {
680  return __gthrw_(pthread_equal) (__t1, __t2);
681 }
682 
683 static inline __gthread_t
684 __gthread_self (void)
685 {
686  return __gthrw_(pthread_self) ();
687 }
688 
689 static inline int
690 __gthread_yield (void)
691 {
692  return __gthrw_(sched_yield) ();
693 }
694 
695 static inline int
696 __gthread_once (__gthread_once_t *__once, void (*__func) (void))
697 {
698  if (__gthread_active_p ())
699  return __gthrw_(pthread_once) (__once, __func);
700  else
701  return -1;
702 }
703 
704 static inline int
705 __gthread_key_create (__gthread_key_t *__key, void (*__dtor) (void *))
706 {
707  return __gthrw_(pthread_key_create) (__key, __dtor);
708 }
709 
710 static inline int
711 __gthread_key_delete (__gthread_key_t __key)
712 {
713  return __gthrw_(pthread_key_delete) (__key);
714 }
715 
716 static inline void *
717 __gthread_getspecific (__gthread_key_t __key)
718 {
719  return __gthrw_(pthread_getspecific) (__key);
720 }
721 
722 static inline int
723 __gthread_setspecific (__gthread_key_t __key, const void *__ptr)
724 {
725  return __gthrw_(pthread_setspecific) (__key, __ptr);
726 }
727 
728 static inline int
729 __gthread_mutex_destroy (__gthread_mutex_t *__mutex)
730 {
731  if (__gthread_active_p ())
732  return __gthrw_(pthread_mutex_destroy) (__mutex);
733  else
734  return 0;
735 }
736 
737 static inline int
738 __gthread_mutex_lock (__gthread_mutex_t *__mutex)
739 {
740  if (__gthread_active_p ())
741  return __gthrw_(pthread_mutex_lock) (__mutex);
742  else
743  return 0;
744 }
745 
746 static inline int
747 __gthread_mutex_trylock (__gthread_mutex_t *__mutex)
748 {
749  if (__gthread_active_p ())
750  return __gthrw_(pthread_mutex_trylock) (__mutex);
751  else
752  return 0;
753 }
754 
755 #ifdef _POSIX_TIMEOUTS
756 #if _POSIX_TIMEOUTS >= 0
757 static inline int
758 __gthread_mutex_timedlock (__gthread_mutex_t *__mutex,
759  const __gthread_time_t *__abs_timeout)
760 {
761  if (__gthread_active_p ())
762  return __gthrw_(pthread_mutex_timedlock) (__mutex, __abs_timeout);
763  else
764  return 0;
765 }
766 #endif
767 #endif
768 
769 static inline int
770 __gthread_mutex_unlock (__gthread_mutex_t *__mutex)
771 {
772  if (__gthread_active_p ())
773  return __gthrw_(pthread_mutex_unlock) (__mutex);
774  else
775  return 0;
776 }
777 
778 #ifndef PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP
779 static inline int
780 __gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *__mutex)
781 {
782  if (__gthread_active_p ())
783  {
784  pthread_mutexattr_t __attr;
785  int __r;
786 
787  __r = __gthrw_(pthread_mutexattr_init) (&__attr);
788  if (!__r)
789  __r = __gthrw_(pthread_mutexattr_settype) (&__attr,
790  PTHREAD_MUTEX_RECURSIVE);
791  if (!__r)
792  __r = __gthrw_(pthread_mutex_init) (__mutex, &__attr);
793  if (!__r)
794  __r = __gthrw_(pthread_mutexattr_destroy) (&__attr);
795  return __r;
796  }
797  return 0;
798 }
799 #endif
800 
801 static inline int
802 __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *__mutex)
803 {
804  return __gthread_mutex_lock (__mutex);
805 }
806 
807 static inline int
808 __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *__mutex)
809 {
810  return __gthread_mutex_trylock (__mutex);
811 }
812 
813 #ifdef _POSIX_TIMEOUTS
814 #if _POSIX_TIMEOUTS >= 0
815 static inline int
816 __gthread_recursive_mutex_timedlock (__gthread_recursive_mutex_t *__mutex,
817  const __gthread_time_t *__abs_timeout)
818 {
819  return __gthread_mutex_timedlock (__mutex, __abs_timeout);
820 }
821 #endif
822 #endif
823 
824 static inline int
825 __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *__mutex)
826 {
827  return __gthread_mutex_unlock (__mutex);
828 }
829 
830 static inline int
831 __gthread_cond_broadcast (__gthread_cond_t *__cond)
832 {
833  return __gthrw_(pthread_cond_broadcast) (__cond);
834 }
835 
836 static inline int
837 __gthread_cond_signal (__gthread_cond_t *__cond)
838 {
839  return __gthrw_(pthread_cond_signal) (__cond);
840 }
841 
842 static inline int
843 __gthread_cond_wait (__gthread_cond_t *__cond, __gthread_mutex_t *__mutex)
844 {
845  return __gthrw_(pthread_cond_wait) (__cond, __mutex);
846 }
847 
848 static inline int
849 __gthread_cond_timedwait (__gthread_cond_t *__cond, __gthread_mutex_t *__mutex,
850  const __gthread_time_t *__abs_timeout)
851 {
852  return __gthrw_(pthread_cond_timedwait) (__cond, __mutex, __abs_timeout);
853 }
854 
855 static inline int
856 __gthread_cond_wait_recursive (__gthread_cond_t *__cond,
857  __gthread_recursive_mutex_t *__mutex)
858 {
859  return __gthread_cond_wait (__cond, __mutex);
860 }
861 
862 static inline int
863 __gthread_cond_timedwait_recursive (__gthread_cond_t *__cond,
864  __gthread_recursive_mutex_t *__mutex,
865  const __gthread_time_t *__abs_timeout)
866 {
867  return __gthread_cond_timedwait (__cond, __mutex, __abs_timeout);
868 }
869 
870 static inline int
871 __gthread_cond_destroy (__gthread_cond_t* __cond)
872 {
873  return __gthrw_(pthread_cond_destroy) (__cond);
874 }
875 
876 #endif /* _LIBOBJC */
877 
878 #endif /* ! _GLIBCXX_GCC_GTHR_POSIX_H */
size_t count() const
Returns the number of bits which are set.
Definition: bitset:1270
_Tp arg(const complex< _Tp > &)
Return phase angle of z.
Definition: complex:623