67 lines
2.0 KiB
C
67 lines
2.0 KiB
C
/* Copyright (C) 2002 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include "pthreadP.h"
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#include <lowlevellock.h>
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int
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pthread_cond_wait (cond, mutex)
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pthread_cond_t *cond;
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pthread_mutex_t *mutex;
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{
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int err;
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/* This function is a cancellation point. Test before we potentially
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go to sleep. */
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CANCELLATION_P (THREAD_SELF);
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/* Make sure the condition is modified atomically. */
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lll_mutex_lock (cond->__data.__lock);
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/* Release the mutex. This might fail. */
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err = INTUSE(__pthread_mutex_unlock) (mutex);
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if (__builtin_expect (err != 0, 0))
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{
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lll_mutex_unlock (cond->__data.__lock);
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return err;
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}
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/* One more tread waiting. */
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++cond->__data.__nr_sleepers;
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/* The actual conditional variable implementation. */
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lll_cond_wait (cond);
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if (--cond->__data.__nr_sleepers == 0)
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/* Forget about the current wakeups now that they are done. */
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cond->__data.__nr_wakers = 0;
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/* Lose the condvar lock. */
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lll_mutex_unlock (cond->__data.__lock);
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/* We have to get the mutex before returning. */
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err = INTUSE(__pthread_mutex_lock) (mutex);
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/* Cancellation handling. */
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CANCELLATION_P (THREAD_SELF);
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return err;
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}
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