Remove NOT_IN_libc definition for pthread_atfork
[glibc.git] / nptl / pthread_cond_destroy.c
blob2cc2b882762cbf799f11a95210c15675043e3a58
1 /* Copyright (C) 2002-2014 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
19 #include <errno.h>
20 #include <shlib-compat.h>
21 #include "pthreadP.h"
22 #include <stap-probe.h>
25 int
26 __pthread_cond_destroy (cond)
27 pthread_cond_t *cond;
29 int pshared = (cond->__data.__mutex == (void *) ~0l)
30 ? LLL_SHARED : LLL_PRIVATE;
32 LIBC_PROBE (cond_destroy, 1, cond);
34 /* Make sure we are alone. */
35 lll_lock (cond->__data.__lock, pshared);
37 if (cond->__data.__total_seq > cond->__data.__wakeup_seq)
39 /* If there are still some waiters which have not been
40 woken up, this is an application bug. */
41 lll_unlock (cond->__data.__lock, pshared);
42 return EBUSY;
45 /* Tell pthread_cond_*wait that this condvar is being destroyed. */
46 cond->__data.__total_seq = -1ULL;
48 /* If there are waiters which have been already signalled or
49 broadcasted, but still are using the pthread_cond_t structure,
50 pthread_cond_destroy needs to wait for them. */
51 unsigned int nwaiters = cond->__data.__nwaiters;
53 if (nwaiters >= (1 << COND_NWAITERS_SHIFT))
55 /* Wake everybody on the associated mutex in case there are
56 threads that have been requeued to it.
57 Without this, pthread_cond_destroy could block potentially
58 for a long time or forever, as it would depend on other
59 thread's using the mutex.
60 When all threads waiting on the mutex are woken up, pthread_cond_wait
61 only waits for threads to acquire and release the internal
62 condvar lock. */
63 if (cond->__data.__mutex != NULL
64 && cond->__data.__mutex != (void *) ~0l)
66 pthread_mutex_t *mut = (pthread_mutex_t *) cond->__data.__mutex;
67 lll_futex_wake (&mut->__data.__lock, INT_MAX,
68 PTHREAD_MUTEX_PSHARED (mut));
73 lll_unlock (cond->__data.__lock, pshared);
75 lll_futex_wait (&cond->__data.__nwaiters, nwaiters, pshared);
77 lll_lock (cond->__data.__lock, pshared);
79 nwaiters = cond->__data.__nwaiters;
81 while (nwaiters >= (1 << COND_NWAITERS_SHIFT));
84 return 0;
86 versioned_symbol (libpthread, __pthread_cond_destroy,
87 pthread_cond_destroy, GLIBC_2_3_2);