mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-25 14:30:06 +00:00
68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
/* Copyright (C) 2002 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#include "pthreadP.h"
|
|
#include <lowlevellock.h>
|
|
|
|
|
|
int
|
|
__pthread_cond_wait (cond, mutex)
|
|
pthread_cond_t *cond;
|
|
pthread_mutex_t *mutex;
|
|
{
|
|
int err;
|
|
|
|
/* This function is a cancellation point. Test before we potentially
|
|
go to sleep. */
|
|
CANCELLATION_P (THREAD_SELF);
|
|
|
|
/* Make sure the condition is modified atomically. */
|
|
lll_mutex_lock (cond->__data.__lock);
|
|
|
|
/* Release the mutex. This might fail. */
|
|
err = INTUSE(__pthread_mutex_unlock) (mutex);
|
|
if (__builtin_expect (err != 0, 0))
|
|
{
|
|
lll_mutex_unlock (cond->__data.__lock);
|
|
return err;
|
|
}
|
|
|
|
/* One more tread waiting. */
|
|
++cond->__data.__nr_sleepers;
|
|
|
|
/* The actual conditional variable implementation. */
|
|
lll_cond_wait (cond);
|
|
|
|
if (--cond->__data.__nr_sleepers == 0)
|
|
/* Forget about the current wakeups now that they are done. */
|
|
cond->__data.__nr_wakers = 0;
|
|
|
|
/* Lose the condvar lock. */
|
|
lll_mutex_unlock (cond->__data.__lock);
|
|
|
|
/* We have to get the mutex before returning. */
|
|
err = INTUSE(__pthread_mutex_lock) (mutex);
|
|
|
|
/* Cancellation handling. */
|
|
CANCELLATION_P (THREAD_SELF);
|
|
|
|
return err;
|
|
}
|
|
strong_alias (__pthread_cond_wait, pthread_cond_wait)
|