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/* Wait on a condition. Generic version.
Copyright (C) 2000, 2002, 2005 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <pthread.h>
#include <pt-internal.h>
extern int __pthread_cond_timedwait_internal (pthread_cond_t *cond,
pthread_mutex_t *mutex,
const struct timespec *abstime);
int
pthread_cond_timedwait (pthread_cond_t *cond,
pthread_mutex_t *mutex,
const struct timespec *abstime)
{
return __pthread_cond_timedwait_internal (cond, mutex, abstime);
}
/* Block on condition variable COND until ABSTIME. As a GNU
extension, if ABSTIME is NULL, then wait forever. MUTEX should be
held by the calling thread. On return, MUTEX will be held by the
calling thread. */
int
__pthread_cond_timedwait_internal (pthread_cond_t *cond,
pthread_mutex_t *mutex,
const struct timespec *abstime)
{
error_t err;
int canceltype;
void cleanup (void *arg)
{
struct __pthread *self = _pthread_self ();
__pthread_spin_lock (&cond->__lock);
if (self->prevp)
__pthread_dequeue (self);
__pthread_spin_unlock (&cond->__lock);
pthread_setcanceltype (canceltype, &canceltype);
__pthread_mutex_lock (mutex);
}
if (abstime && (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000))
return EINVAL;
struct __pthread *self = _pthread_self ();
/* Add ourselves to the list of waiters. */
__pthread_spin_lock (&cond->__lock);
__pthread_enqueue (&cond->__queue, self);
__pthread_spin_unlock (&cond->__lock);
__pthread_mutex_unlock (mutex);
/* Enter async cancelation mode. If cancelation is disabled, then
this does not change anything which is exactly what we want. */
pthread_cleanup_push (cleanup, 0);
pthread_setcanceltype (PTHREAD_CANCEL_ASYNCHRONOUS, &canceltype);
if (abstime)
{
err = __pthread_timedblock (self, abstime);
if (err)
/* We timed out. We may need to disconnect ourself from the
waiter queue.
FIXME: What do we do if we get a wakeup message before we
disconnect ourself? It may remain until the next time we
block. */
{
assert (err == ETIMEDOUT);
__pthread_spin_lock (&mutex->__lock);
if (self->prevp)
__pthread_dequeue (self);
__pthread_spin_unlock (&mutex->__lock);
}
}
else
{
err = 0;
__pthread_block (self);
}
pthread_cleanup_pop (1);
return err;
}
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