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/*
LibRCC - module responsible for thread synchronization
Copyright (C) 2005-2008 Suren A. Chilingaryan <csa@dside.dyndns.org>
This program is free software; you can redistribute it and/or modify it
under the terms of version 2 of the GNU General Public License as published
by the Free Software Foundation.
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 <stdlib.h>
#include <time.h>
#include "rccmutex.h"
#define RCC_MUTEX_SLEEP 500
rcc_mutex rccMutexCreate() {
rcc_mutex mutex;
mutex = (rcc_mutex)malloc(sizeof(rcc_mutex_s));
if (mutex) {
#ifdef HAVE_PTHREAD
pthread_mutex_init(&mutex->mutex, NULL);
#else
mutex->mutex = 0;
#endif /* HAVE_PTHREAD */
}
return mutex;
}
void rccMutexFree(rcc_mutex mutex) {
if (mutex) {
#ifdef HAVE_PTHREAD
pthread_mutex_destroy(&mutex->mutex);
#endif /* HAVE_PTHREAD */
free(mutex);
}
}
int rccMutexLock(rcc_mutex mutex) {
#ifndef HAVE_PTHREAD
struct timespec ts;
#endif /* !HAVE_PTHREAD */
if (!mutex) return -1;
#ifdef HAVE_PTHREAD
return pthread_mutex_lock(&mutex->mutex);
#else
while (mutex->mutex) {
ts.tv_sec = RCC_MUTEX_SLEEP / 1000000;
ts.tv_nsec = (RCC_MUTEX_SLEEP % 1000000)*1000;
nanosleep(&ts, NULL);
}
mutex->mutex = 1;
return 0;
#endif /* HAVE_PTHREAD */
}
int rccMutexTryLock(rcc_mutex mutex) {
if (!mutex) return -1;
#ifdef HAVE_PTHREAD
return pthread_mutex_trylock(&mutex->mutex);
#else
if (mutex->mutex) return -1;
mutex->mutex = 1;
return 0;
#endif /* HAVE_PTHREAD */
}
void rccMutexUnLock(rcc_mutex mutex) {
if (!mutex) return;
#ifdef HAVE_PTHREAD
pthread_mutex_unlock(&mutex->mutex);
#else
mutex->mutex = 0;
#endif /* HAVE_PTHREAD */
}
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