/*
* semaphore.cpp (C) 2007-2008, Aurélien Croc (AP²C)
*
* 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; version 2 of the License.
*
* 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.
*
* $Id: semaphore.cpp 139 2008-01-31 16:48:23Z ap2c $
*
*/
#include "semaphore.h"
#ifndef DISABLE_THREADS
/*
* Constructeur - Destructeur
* Init - Uninit
*/
Semaphore::Semaphore()
{
_counter = 1;
pthread_mutex_init(&_lock, NULL);
pthread_cond_init(&_cond, NULL);
}
Semaphore::Semaphore(unsigned long counter)
{
_counter = counter;
pthread_mutex_init(&_lock, NULL);
pthread_cond_init(&_cond, NULL);
}
Semaphore::~Semaphore()
{
}
/*
* Utilisation de la sémaphore en mutex
* Semaphore used in mutex mode
*/
void Semaphore::lock()
{
pthread_mutex_lock(&_lock);
}
void Semaphore::unlock()
{
pthread_mutex_unlock(&_lock);
}
/*
* Gestion du compteur de la semaphore
* Semaphore counter management
*/
Semaphore& Semaphore::operator --(int)
{
pthread_mutex_lock(&_lock);
while (!_counter)
pthread_cond_wait(&_cond, &_lock);
_counter--;
pthread_mutex_unlock(&_lock);
return *this;
}
Semaphore& Semaphore::operator ++(int)
{
pthread_mutex_lock(&_lock);
if (!_counter)
pthread_cond_signal(&_cond);
_counter++;
pthread_mutex_unlock(&_lock);
return *this;
}
#endif /* DISABLE_THREADS */
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