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46 lines
1.6 KiB
C
46 lines
1.6 KiB
C
/* Copyright (C) 2002-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include "pthreadP.h"
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#include <stap-probe.h>
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int
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__pthread_mutex_destroy (pthread_mutex_t *mutex)
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{
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LIBC_PROBE (mutex_destroy, 1, mutex);
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/* See concurrency notes regarding __kind in struct __pthread_mutex_s
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in sysdeps/nptl/bits/thread-shared-types.h. */
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if ((atomic_load_relaxed (&(mutex->__data.__kind))
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& PTHREAD_MUTEX_ROBUST_NORMAL_NP) == 0
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&& mutex->__data.__nusers != 0)
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return EBUSY;
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/* Set to an invalid value. Relaxed MO is enough as it is undefined behavior
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if the mutex is used after it has been destroyed. But you can reinitialize
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it with pthread_mutex_init. */
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atomic_store_relaxed (&(mutex->__data.__kind), -1);
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return 0;
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}
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weak_alias (__pthread_mutex_destroy, pthread_mutex_destroy)
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hidden_def (__pthread_mutex_destroy)
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