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/* the Music Player Daemon (MPD)
* Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
* Copyright (C) 2008 Max Kellermann <max@duempel.org>
* This project's homepage is: http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "condition.h"
#include "utils.h"
#include "log.h"
void cond_init(struct condition *cond)
{
xpthread_mutex_init(&cond->mutex, NULL);
xpthread_cond_init(&cond->cond, NULL);
}
int cond_timedwait(struct condition *cond, const long msec)
{
static const long nsec_per_msec = 1000000;
static const long nsec_per_usec = 1000;
static const long nsec_per_sec = 1000000000;
struct timespec ts;
struct timeval tv;
int ret;
gettimeofday(&tv, NULL);
ts.tv_sec = tv.tv_sec;
ts.tv_nsec = (tv.tv_usec * nsec_per_usec) + (msec * nsec_per_msec);
if (ts.tv_nsec >= nsec_per_sec) {
ts.tv_nsec -= nsec_per_sec;
ts.tv_sec++;
}
ret = pthread_cond_timedwait(&cond->cond, &cond->mutex, &ts);
if (!ret || ret == ETIMEDOUT)
return ret;
FATAL("cond_timedwait: %s\n", strerror(ret));
return ret;
}
int cond_signal_trysync(struct condition *cond)
{
if (pthread_mutex_trylock(&cond->mutex) == EBUSY)
return EBUSY;
pthread_cond_signal(&cond->cond);
pthread_mutex_unlock(&cond->mutex);
return 0;
}
void cond_signal_sync(struct condition *cond)
{
pthread_mutex_lock(&cond->mutex);
pthread_cond_signal(&cond->cond);
pthread_mutex_unlock(&cond->mutex);
}
void cond_destroy(struct condition *cond)
{
xpthread_cond_destroy(&cond->cond);
xpthread_mutex_destroy(&cond->mutex);
}
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