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/*
* semaphore.h (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.h 138 2008-01-31 14:42:24Z ap2c $
*
*/
#ifndef _SEMAPHORE_H_
#define _SEMAPHORE_H_
#ifndef DISABLE_THREADS
#include <pthread.h>
/**
* @brief This class provides the semaphore mechanism.
*/
class Semaphore {
protected:
unsigned long _counter;
pthread_mutex_t _lock;
pthread_cond_t _cond;
bool _mutex;
public:
/**
* Initialize the Semaphore instance.
* The value of the internal counter will be initialized to 1.
*/
Semaphore();
/**
* Initialize the Semaphore instance by specifying the value of the
* internal counter.
* @param counter the initial value of the internal counter.
*/
Semaphore(unsigned long counter);
/**
* Destroy the instance.
*/
virtual ~Semaphore();
public:
/**
* Use the semaphore as a mutex and lock it.
*/
void lock();
/**
* Use th semaphore as a mutex and unlock it.
*/
void unlock();
/**
* Decrement the semaphore.
*/
Semaphore& operator --(int);
/**
* Increment the semaphore.
*/
Semaphore& operator ++(int);
};
#endif /* DISABLE_THREADS */
#endif /* _SEMAPHORE_H_ */
/* vim: set expandtab tabstop=4 shiftwidth=4 smarttab tw=80 cin enc=utf8: */
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