1 /* GLIB - Library of useful routines for C programming
2 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
4 * gthread.c: posix thread system implementation
5 * Copyright 1998 Sebastian Wilhelmi; University of Karlsruhe
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 * Boston, MA 02111-1307, USA.
24 * Modified by the GLib Team and others 1997-2000. See the AUTHORS
25 * file for a list of people on the GLib Team. See the ChangeLog
26 * files for a list of changes. These files are distributed with
27 * GLib at ftp://ftp.gtk.org/pub/gtk/.
30 /* The GMutex, GCond and GPrivate implementations in this file are some
31 * of the lowest-level code in GLib. All other parts of GLib (messages,
32 * memory, slices, etc) assume that they can freely use these facilities
33 * without risking recursion.
35 * As such, these functions are NOT permitted to call any other part of
38 * The thread manipulation functions (create, exit, join, etc.) have
39 * more freedom -- they can do as they please.
46 #include "gthreadprivate.h"
48 #include "gmessages.h"
49 #include "gstrfuncs.h"
57 #ifdef HAVE_SYS_TIME_H
58 # include <sys/time.h>
66 #ifdef HAVE_SYS_PRCTL_H
67 #include <sys/prctl.h>
71 g_thread_abort (gint status,
72 const gchar *function)
74 fprintf (stderr, "GLib (gthread-posix.c): Unexpected error from C library during '%s': %s. Aborting.\n",
75 function, strerror (status));
81 static pthread_mutex_t *
82 g_mutex_impl_new (void)
84 pthread_mutexattr_t *pattr = NULL;
85 pthread_mutex_t *mutex;
88 mutex = malloc (sizeof (pthread_mutex_t));
89 if G_UNLIKELY (mutex == NULL)
90 g_thread_abort (errno, "malloc");
92 #ifdef PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
93 pthread_mutexattr_t attr;
94 pthread_mutexattr_init (&attr);
95 pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_ADAPTIVE_NP);
99 if G_UNLIKELY ((status = pthread_mutex_init (mutex, pattr)) != 0)
100 g_thread_abort (status, "pthread_mutex_init");
102 #ifdef PTHREAD_ADAPTIVE_MUTEX_NP
103 pthread_mutexattr_destroy (&attr);
110 g_mutex_impl_free (pthread_mutex_t *mutex)
112 pthread_mutex_destroy (mutex);
116 static pthread_mutex_t *
117 g_mutex_get_impl (GMutex *mutex)
119 pthread_mutex_t *impl = mutex->p;
121 if G_UNLIKELY (impl == NULL)
123 impl = g_mutex_impl_new ();
124 if (!g_atomic_pointer_compare_and_exchange (&mutex->p, NULL, impl))
125 g_mutex_impl_free (impl);
135 * @mutex: an uninitialized #GMutex
137 * Initializes a #GMutex so that it can be used.
139 * This function is useful to initialize a mutex that has been
140 * allocated on the stack, or as part of a larger structure.
141 * It is not necessary to initialize a mutex that has been
142 * created that has been statically allocated.
152 * b = g_new (Blob, 1);
153 * g_mutex_init (&b->m);
156 * To undo the effect of g_mutex_init() when a mutex is no longer
157 * needed, use g_mutex_clear().
159 * Calling g_mutex_init() on an already initialized #GMutex leads
160 * to undefined behaviour.
165 g_mutex_init (GMutex *mutex)
167 mutex->p = g_mutex_impl_new ();
172 * @mutex: an initialized #GMutex
174 * Frees the resources allocated to a mutex with g_mutex_init().
176 * This function should not be used with a #GMutex that has been
177 * statically allocated.
179 * Calling g_mutex_clear() on a locked mutex leads to undefined
185 g_mutex_clear (GMutex *mutex)
187 g_mutex_impl_free (mutex->p);
194 * Locks @mutex. If @mutex is already locked by another thread, the
195 * current thread will block until @mutex is unlocked by the other
198 * <note>#GMutex is neither guaranteed to be recursive nor to be
199 * non-recursive. As such, calling g_mutex_lock() on a #GMutex that has
200 * already been locked by the same thread results in undefined behaviour
201 * (including but not limited to deadlocks).</note>
204 g_mutex_lock (GMutex *mutex)
208 if G_UNLIKELY ((status = pthread_mutex_lock (g_mutex_get_impl (mutex))) != 0)
209 g_thread_abort (status, "pthread_mutex_lock");
216 * Unlocks @mutex. If another thread is blocked in a g_mutex_lock()
217 * call for @mutex, it will become unblocked and can lock @mutex itself.
219 * Calling g_mutex_unlock() on a mutex that is not locked by the
220 * current thread leads to undefined behaviour.
223 g_mutex_unlock (GMutex *mutex)
227 if G_UNLIKELY ((status = pthread_mutex_unlock (g_mutex_get_impl (mutex))) != 0)
228 g_thread_abort (status, "pthread_mutex_unlock");
235 * Tries to lock @mutex. If @mutex is already locked by another thread,
236 * it immediately returns %FALSE. Otherwise it locks @mutex and returns
239 * <note>#GMutex is neither guaranteed to be recursive nor to be
240 * non-recursive. As such, calling g_mutex_lock() on a #GMutex that has
241 * already been locked by the same thread results in undefined behaviour
242 * (including but not limited to deadlocks or arbitrary return values).
245 * Returns: %TRUE if @mutex could be locked
248 g_mutex_trylock (GMutex *mutex)
252 if G_LIKELY ((status = pthread_mutex_trylock (g_mutex_get_impl (mutex))) == 0)
255 if G_UNLIKELY (status != EBUSY)
256 g_thread_abort (status, "pthread_mutex_trylock");
263 static pthread_mutex_t *
264 g_rec_mutex_impl_new (void)
266 pthread_mutexattr_t attr;
267 pthread_mutex_t *mutex;
269 mutex = g_slice_new (pthread_mutex_t);
270 pthread_mutexattr_init (&attr);
271 pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_RECURSIVE);
272 pthread_mutex_init (mutex, &attr);
273 pthread_mutexattr_destroy (&attr);
279 g_rec_mutex_impl_free (pthread_mutex_t *mutex)
281 pthread_mutex_destroy (mutex);
282 g_slice_free (pthread_mutex_t, mutex);
285 static pthread_mutex_t *
286 g_rec_mutex_get_impl (GRecMutex *rec_mutex)
288 pthread_mutex_t *impl = rec_mutex->p;
290 if G_UNLIKELY (impl == NULL)
292 impl = g_rec_mutex_impl_new ();
293 if (!g_atomic_pointer_compare_and_exchange (&rec_mutex->p, NULL, impl))
294 g_rec_mutex_impl_free (impl);
303 * @rec_mutex: an uninitialized #GRecMutex
305 * Initializes a #GRecMutex so that it can be used.
307 * This function is useful to initialize a recursive mutex
308 * that has been allocated on the stack, or as part of a larger
311 * It is not necessary to initialise a recursive mutex that has been
312 * statically allocated.
322 * b = g_new (Blob, 1);
323 * g_rec_mutex_init (&b->m);
326 * Calling g_rec_mutex_init() on an already initialized #GRecMutex
327 * leads to undefined behaviour.
329 * To undo the effect of g_rec_mutex_init() when a recursive mutex
330 * is no longer needed, use g_rec_mutex_clear().
335 g_rec_mutex_init (GRecMutex *rec_mutex)
337 rec_mutex->p = g_rec_mutex_impl_new ();
342 * @rec_mutex: an initialized #GRecMutex
344 * Frees the resources allocated to a recursive mutex with
345 * g_rec_mutex_init().
347 * This function should not be used with a #GRecMutex that has been
348 * statically allocated.
350 * Calling g_rec_mutex_clear() on a locked recursive mutex leads
351 * to undefined behaviour.
356 g_rec_mutex_clear (GRecMutex *rec_mutex)
358 g_rec_mutex_impl_free (rec_mutex->p);
363 * @rec_mutex: a #GRecMutex
365 * Locks @rec_mutex. If @rec_mutex is already locked by another
366 * thread, the current thread will block until @rec_mutex is
367 * unlocked by the other thread. If @rec_mutex is already locked
368 * by the current thread, the 'lock count' of @rec_mutex is increased.
369 * The mutex will only become available again when it is unlocked
370 * as many times as it has been locked.
375 g_rec_mutex_lock (GRecMutex *mutex)
377 pthread_mutex_lock (g_rec_mutex_get_impl (mutex));
381 * g_rec_mutex_unlock:
382 * @rec_mutex: a #GRecMutex
384 * Unlocks @rec_mutex. If another thread is blocked in a
385 * g_rec_mutex_lock() call for @rec_mutex, it will become unblocked
386 * and can lock @rec_mutex itself.
388 * Calling g_rec_mutex_unlock() on a recursive mutex that is not
389 * locked by the current thread leads to undefined behaviour.
394 g_rec_mutex_unlock (GRecMutex *rec_mutex)
396 pthread_mutex_unlock (rec_mutex->p);
400 * g_rec_mutex_trylock:
401 * @rec_mutex: a #GRecMutex
403 * Tries to lock @rec_mutex. If @rec_mutex is already locked
404 * by another thread, it immediately returns %FALSE. Otherwise
405 * it locks @rec_mutex and returns %TRUE.
407 * Returns: %TRUE if @rec_mutex could be locked
412 g_rec_mutex_trylock (GRecMutex *rec_mutex)
414 if (pthread_mutex_trylock (g_rec_mutex_get_impl (rec_mutex)) != 0)
422 static pthread_rwlock_t *
423 g_rw_lock_impl_new (void)
425 pthread_rwlock_t *rwlock;
428 rwlock = malloc (sizeof (pthread_rwlock_t));
429 if G_UNLIKELY (rwlock == NULL)
430 g_thread_abort (errno, "malloc");
432 if G_UNLIKELY ((status = pthread_rwlock_init (rwlock, NULL)) != 0)
433 g_thread_abort (status, "pthread_rwlock_init");
439 g_rw_lock_impl_free (pthread_rwlock_t *rwlock)
441 pthread_rwlock_destroy (rwlock);
445 static pthread_rwlock_t *
446 g_rw_lock_get_impl (GRWLock *lock)
448 pthread_rwlock_t *impl = lock->p;
450 if G_UNLIKELY (impl == NULL)
452 impl = g_rw_lock_impl_new ();
453 if (!g_atomic_pointer_compare_and_exchange (&lock->p, NULL, impl))
454 g_rw_lock_impl_free (impl);
463 * @rw_lock: an uninitialized #GRWLock
465 * Initializes a #GRWLock so that it can be used.
467 * This function is useful to initialize a lock that has been
468 * allocated on the stack, or as part of a larger structure. It is not
469 * necessary to initialise a reader-writer lock that has been statically
480 * b = g_new (Blob, 1);
481 * g_rw_lock_init (&b->l);
484 * To undo the effect of g_rw_lock_init() when a lock is no longer
485 * needed, use g_rw_lock_clear().
487 * Calling g_rw_lock_init() on an already initialized #GRWLock leads
488 * to undefined behaviour.
493 g_rw_lock_init (GRWLock *rw_lock)
495 rw_lock->p = g_rw_lock_impl_new ();
500 * @rw_lock: an initialized #GRWLock
502 * Frees the resources allocated to a lock with g_rw_lock_init().
504 * This function should not be used with a #GRWLock that has been
505 * statically allocated.
507 * Calling g_rw_lock_clear() when any thread holds the lock
508 * leads to undefined behaviour.
513 g_rw_lock_clear (GRWLock *rw_lock)
515 g_rw_lock_impl_free (rw_lock->p);
519 * g_rw_lock_writer_lock:
520 * @rw_lock: a #GRWLock
522 * Obtain a write lock on @rw_lock. If any thread already holds
523 * a read or write lock on @rw_lock, the current thread will block
524 * until all other threads have dropped their locks on @rw_lock.
529 g_rw_lock_writer_lock (GRWLock *rw_lock)
531 pthread_rwlock_wrlock (g_rw_lock_get_impl (rw_lock));
535 * g_rw_lock_writer_trylock:
536 * @rw_lock: a #GRWLock
538 * Tries to obtain a write lock on @rw_lock. If any other thread holds
539 * a read or write lock on @rw_lock, it immediately returns %FALSE.
540 * Otherwise it locks @rw_lock and returns %TRUE.
542 * Returns: %TRUE if @rw_lock could be locked
547 g_rw_lock_writer_trylock (GRWLock *rw_lock)
549 if (pthread_rwlock_trywrlock (g_rw_lock_get_impl (rw_lock)) != 0)
556 * g_rw_lock_writer_unlock:
557 * @rw_lock: a #GRWLock
559 * Release a write lock on @rw_lock.
561 * Calling g_rw_lock_writer_unlock() on a lock that is not held
562 * by the current thread leads to undefined behaviour.
567 g_rw_lock_writer_unlock (GRWLock *rw_lock)
569 pthread_rwlock_unlock (g_rw_lock_get_impl (rw_lock));
573 * g_rw_lock_reader_lock:
574 * @rw_lock: a #GRWLock
576 * Obtain a read lock on @rw_lock. If another thread currently holds
577 * the write lock on @rw_lock or blocks waiting for it, the current
578 * thread will block. Read locks can be taken recursively.
580 * It is implementation-defined how many threads are allowed to
581 * hold read locks on the same lock simultaneously.
586 g_rw_lock_reader_lock (GRWLock *rw_lock)
588 pthread_rwlock_rdlock (g_rw_lock_get_impl (rw_lock));
592 * g_rw_lock_reader_trylock:
593 * @rw_lock: a #GRWLock
595 * Tries to obtain a read lock on @rw_lock and returns %TRUE if
596 * the read lock was successfully obtained. Otherwise it
599 * Returns: %TRUE if @rw_lock could be locked
604 g_rw_lock_reader_trylock (GRWLock *rw_lock)
606 if (pthread_rwlock_tryrdlock (g_rw_lock_get_impl (rw_lock)) != 0)
613 * g_rw_lock_reader_unlock:
614 * @rw_lock: a #GRWLock
616 * Release a read lock on @rw_lock.
618 * Calling g_rw_lock_reader_unlock() on a lock that is not held
619 * by the current thread leads to undefined behaviour.
624 g_rw_lock_reader_unlock (GRWLock *rw_lock)
626 pthread_rwlock_unlock (g_rw_lock_get_impl (rw_lock));
631 static pthread_cond_t *
632 g_cond_impl_new (void)
634 pthread_condattr_t attr;
635 pthread_cond_t *cond;
638 pthread_condattr_init (&attr);
639 #if defined (HAVE_PTHREAD_CONDATTR_SETCLOCK) && defined (CLOCK_MONOTONIC)
640 pthread_condattr_setclock (&attr, CLOCK_MONOTONIC);
643 cond = malloc (sizeof (pthread_cond_t));
644 if G_UNLIKELY (cond == NULL)
645 g_thread_abort (errno, "malloc");
647 if G_UNLIKELY ((status = pthread_cond_init (cond, &attr)) != 0)
648 g_thread_abort (status, "pthread_cond_init");
650 pthread_condattr_destroy (&attr);
656 g_cond_impl_free (pthread_cond_t *cond)
658 pthread_cond_destroy (cond);
662 static pthread_cond_t *
663 g_cond_get_impl (GCond *cond)
665 pthread_cond_t *impl = cond->p;
667 if G_UNLIKELY (impl == NULL)
669 impl = g_cond_impl_new ();
670 if (!g_atomic_pointer_compare_and_exchange (&cond->p, NULL, impl))
671 g_cond_impl_free (impl);
680 * @cond: an uninitialized #GCond
682 * Initialises a #GCond so that it can be used.
684 * This function is useful to initialise a #GCond that has been
685 * allocated as part of a larger structure. It is not necessary to
686 * initialise a #GCond that has been statically allocated.
688 * To undo the effect of g_cond_init() when a #GCond is no longer
689 * needed, use g_cond_clear().
691 * Calling g_cond_init() on an already-initialised #GCond leads
692 * to undefined behaviour.
697 g_cond_init (GCond *cond)
699 cond->p = g_cond_impl_new ();
704 * @cond: an initialised #GCond
706 * Frees the resources allocated to a #GCond with g_cond_init().
708 * This function should not be used with a #GCond that has been
709 * statically allocated.
711 * Calling g_cond_clear() for a #GCond on which threads are
712 * blocking leads to undefined behaviour.
717 g_cond_clear (GCond *cond)
719 g_cond_impl_free (cond->p);
725 * @mutex: a #GMutex that is currently locked
727 * Atomically releases @mutex and waits until @cond is signalled.
729 * When using condition variables, it is possible that a spurious wakeup
730 * may occur (ie: g_cond_wait() returns even though g_cond_signal() was
731 * not called). It's also possible that a stolen wakeup may occur.
732 * This is when g_cond_signal() is called, but another thread acquires
733 * @mutex before this thread and modifies the state of the program in
734 * such a way that when g_cond_wait() is able to return, the expected
735 * condition is no longer met.
737 * For this reason, g_cond_wait() must always be used in a loop. See
738 * the documentation for #GCond for a complete example.
741 g_cond_wait (GCond *cond,
746 if G_UNLIKELY ((status = pthread_cond_wait (g_cond_get_impl (cond), g_mutex_get_impl (mutex))) != 0)
747 g_thread_abort (status, "pthread_cond_wait");
754 * If threads are waiting for @cond, at least one of them is unblocked.
755 * If no threads are waiting for @cond, this function has no effect.
756 * It is good practice to hold the same lock as the waiting thread
757 * while calling this function, though not required.
760 g_cond_signal (GCond *cond)
764 if G_UNLIKELY ((status = pthread_cond_signal (g_cond_get_impl (cond))) != 0)
765 g_thread_abort (status, "pthread_cond_signal");
772 * If threads are waiting for @cond, all of them are unblocked.
773 * If no threads are waiting for @cond, this function has no effect.
774 * It is good practice to lock the same mutex as the waiting threads
775 * while calling this function, though not required.
778 g_cond_broadcast (GCond *cond)
782 if G_UNLIKELY ((status = pthread_cond_broadcast (g_cond_get_impl (cond))) != 0)
783 g_thread_abort (status, "pthread_cond_broadcast");
789 * @mutex: a #GMutex that is currently locked
790 * @end_time: the monotonic time to wait until
792 * Waits until either @cond is signalled or @end_time has passed.
794 * As with g_cond_wait() it is possible that a spurious or stolen wakeup
795 * could occur. For that reason, waiting on a condition variable should
796 * always be in a loop, based on an explicitly-checked predicate.
798 * %TRUE is returned if the condition variable was signalled (or in the
799 * case of a spurious wakeup). %FALSE is returned if @end_time has
802 * The following code shows how to correctly perform a timed wait on a
803 * condition variable (extended the example presented in the
804 * documentation for #GCond):
808 * pop_data_timed (void)
813 * g_mutex_lock (&data_mutex);
815 * end_time = g_get_monotonic_time () + 5 * G_TIME_SPAN_SECOND;
816 * while (!current_data)
817 * if (!g_cond_wait_until (&data_cond, &data_mutex, end_time))
819 * // timeout has passed.
820 * g_mutex_unlock (&data_mutex);
824 * // there is data for us
825 * data = current_data;
826 * current_data = NULL;
828 * g_mutex_unlock (&data_mutex);
834 * Notice that the end time is calculated once, before entering the
835 * loop and reused. This is the motivation behind the use of absolute
836 * time on this API -- if a relative time of 5 seconds were passed
837 * directly to the call and a spurious wakeup occurred, the program would
838 * have to start over waiting again (which would lead to a total wait
839 * time of more than 5 seconds).
841 * Returns: %TRUE on a signal, %FALSE on a timeout
845 g_cond_wait_until (GCond *cond,
852 ts.tv_sec = end_time / 1000000;
853 ts.tv_nsec = (end_time % 1000000) * 1000;
855 if ((status = pthread_cond_timedwait (g_cond_get_impl (cond), g_mutex_get_impl (mutex), &ts)) == 0)
858 if G_UNLIKELY (status != ETIMEDOUT)
859 g_thread_abort (status, "pthread_cond_timedwait");
869 * The #GPrivate struct is an opaque data structure to represent a
870 * thread-local data key. It is approximately equivalent to the
871 * pthread_setspecific()/pthread_getspecific() APIs on POSIX and to
872 * TlsSetValue()/TlsGetValue() on Windows.
874 * If you don't already know why you might want this functionality,
875 * then you probably don't need it.
877 * #GPrivate is a very limited resource (as far as 128 per program,
878 * shared between all libraries). It is also not possible to destroy a
879 * #GPrivate after it has been used. As such, it is only ever acceptable
880 * to use #GPrivate in static scope, and even then sparingly so.
882 * See G_PRIVATE_INIT() for a couple of examples.
884 * The #GPrivate structure should be considered opaque. It should only
885 * be accessed via the <function>g_private_</function> functions.
890 * @notify: a #GDestroyNotify
892 * A macro to assist with the static initialisation of a #GPrivate.
894 * This macro is useful for the case that a #GDestroyNotify function
895 * should be associated the key. This is needed when the key will be
896 * used to point at memory that should be deallocated when the thread
899 * Additionally, the #GDestroyNotify will also be called on the previous
900 * value stored in the key when g_private_replace() is used.
902 * If no #GDestroyNotify is needed, then use of this macro is not
903 * required -- if the #GPrivate is declared in static scope then it will
904 * be properly initialised by default (ie: to all zeros). See the
908 * static GPrivate name_key = G_PRIVATE_INIT (g_free);
910 * // return value should not be freed
912 * get_local_name (void)
914 * return g_private_get (&name_key);
918 * set_local_name (const gchar *name)
920 * g_private_replace (&name_key, g_strdup (name));
924 * static GPrivate count_key; // no free function
927 * get_local_count (void)
929 * return GPOINTER_TO_INT (g_private_get (&count_key));
933 * set_local_count (gint count)
935 * g_private_set (&count_key, GINT_TO_POINTER (count));
942 static pthread_key_t *
943 g_private_impl_new (GDestroyNotify notify)
948 key = malloc (sizeof (pthread_key_t));
949 if G_UNLIKELY (key == NULL)
950 g_thread_abort (errno, "malloc");
951 status = pthread_key_create (key, notify);
952 if G_UNLIKELY (status != 0)
953 g_thread_abort (status, "pthread_key_create");
959 g_private_impl_free (pthread_key_t *key)
963 status = pthread_key_delete (*key);
964 if G_UNLIKELY (status != 0)
965 g_thread_abort (status, "pthread_key_delete");
969 static pthread_key_t *
970 g_private_get_impl (GPrivate *key)
972 pthread_key_t *impl = key->p;
974 if G_UNLIKELY (impl == NULL)
976 impl = g_private_impl_new (key->notify);
977 if (!g_atomic_pointer_compare_and_exchange (&key->p, NULL, impl))
979 g_private_impl_free (impl);
991 * Returns the current value of the thread local variable @key.
993 * If the value has not yet been set in this thread, %NULL is returned.
994 * Values are never copied between threads (when a new thread is
995 * created, for example).
997 * Returns: the thread-local value
1000 g_private_get (GPrivate *key)
1002 /* quote POSIX: No errors are returned from pthread_getspecific(). */
1003 return pthread_getspecific (*g_private_get_impl (key));
1009 * @value: the new value
1011 * Sets the thread local variable @key to have the value @value in the
1014 * This function differs from g_private_replace() in the following way:
1015 * the #GDestroyNotify for @key is not called on the old value.
1018 g_private_set (GPrivate *key,
1023 if G_UNLIKELY ((status = pthread_setspecific (*g_private_get_impl (key), value)) != 0)
1024 g_thread_abort (status, "pthread_setspecific");
1028 * g_private_replace:
1030 * @value: the new value
1032 * Sets the thread local variable @key to have the value @value in the
1035 * This function differs from g_private_set() in the following way: if
1036 * the previous value was non-%NULL then the #GDestroyNotify handler for
1037 * @key is run on it.
1042 g_private_replace (GPrivate *key,
1045 pthread_key_t *impl = g_private_get_impl (key);
1049 old = pthread_getspecific (*impl);
1050 if (old && key->notify)
1053 if G_UNLIKELY ((status = pthread_setspecific (*impl, value)) != 0)
1054 g_thread_abort (status, "pthread_setspecific");
1059 #define posix_check_err(err, name) G_STMT_START{ \
1060 int error = (err); \
1062 g_error ("file %s: line %d (%s): error '%s' during '%s'", \
1063 __FILE__, __LINE__, G_STRFUNC, \
1064 g_strerror (error), name); \
1067 #define posix_check_cmd(cmd) posix_check_err (cmd, #cmd)
1073 pthread_t system_thread;
1079 g_system_thread_free (GRealThread *thread)
1081 GThreadPosix *pt = (GThreadPosix *) thread;
1084 pthread_detach (pt->system_thread);
1086 g_mutex_clear (&pt->lock);
1088 g_slice_free (GThreadPosix, pt);
1092 g_system_thread_new (GThreadFunc thread_func,
1096 GThreadPosix *thread;
1097 pthread_attr_t attr;
1100 thread = g_slice_new0 (GThreadPosix);
1102 posix_check_cmd (pthread_attr_init (&attr));
1104 #ifdef HAVE_PTHREAD_ATTR_SETSTACKSIZE
1107 #ifdef _SC_THREAD_STACK_MIN
1108 stack_size = MAX (sysconf (_SC_THREAD_STACK_MIN), stack_size);
1109 #endif /* _SC_THREAD_STACK_MIN */
1110 /* No error check here, because some systems can't do it and
1111 * we simply don't want threads to fail because of that. */
1112 pthread_attr_setstacksize (&attr, stack_size);
1114 #endif /* HAVE_PTHREAD_ATTR_SETSTACKSIZE */
1116 ret = pthread_create (&thread->system_thread, &attr, (void* (*)(void*))thread_func, thread);
1118 posix_check_cmd (pthread_attr_destroy (&attr));
1122 g_set_error (error, G_THREAD_ERROR, G_THREAD_ERROR_AGAIN,
1123 "Error creating thread: %s", g_strerror (ret));
1124 g_slice_free (GThreadPosix, thread);
1128 posix_check_err (ret, "pthread_create");
1130 g_mutex_init (&thread->lock);
1132 return (GRealThread *) thread;
1138 * Causes the calling thread to voluntarily relinquish the CPU, so
1139 * that other threads can run.
1141 * This function is often used as a method to make busy wait less evil.
1144 g_thread_yield (void)
1150 g_system_thread_wait (GRealThread *thread)
1152 GThreadPosix *pt = (GThreadPosix *) thread;
1154 g_mutex_lock (&pt->lock);
1158 posix_check_cmd (pthread_join (pt->system_thread, NULL));
1162 g_mutex_unlock (&pt->lock);
1166 g_system_thread_exit (void)
1168 pthread_exit (NULL);
1172 g_system_thread_set_name (const gchar *name)
1174 #ifdef HAVE_SYS_PRCTL_H
1176 prctl (PR_SET_NAME, name, 0, 0, 0, 0);
1182 /* vim:set foldmethod=marker: */