~drizzle-trunk/drizzle/development

/* Copyright (c) 2008 PrimeBase Technologies GmbH, Germany

 *

 * PrimeBase Media Stream for MySQL

 *

 * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

 *

 * Original author: Paul McCullagh (H&G2JCtL)

 * Continued development: Barry Leslie

 *

 * 2007-06-06

 *

 * CORE SYSTEM:

 * A basic mutex (mutual exclusion) object.

 *

 */

#ifndef __CSMUTEX_H__

#define __CSMUTEX_H__

#include <pthread.h>

#include "CSDefs.h"

class CSThread;

class CSMutex {

public:

	CSMutex();

	virtual ~CSMutex();

	virtual void lock();

	virtual void unlock();

	friend class CSLock;

	friend class CSSync;

private:

	pthread_mutex_t	iMutex;

#ifdef DEBUG

	CSThread		*iLocker;

public:

	bool			trace;

#endif

};

class CSLock : public CSMutex {

public:

	CSLock();

	virtual ~CSLock();

	virtual void lock();

	virtual void unlock();

	virtual bool haveLock();

	friend class CSSync;

private:

	CSThread		*iLockingThread;

	int				iLockCount;

};

class CSSync : public CSLock {

public:

	CSSync();

	virtual ~CSSync();

	/* Wait for resources on the object

	 * to be freed.

	 *

	 * This function may only be called

	 * if the thread has already locked the

	 * object.

	 */

	virtual void wait();

	/* Wait for a certain amount of time, in

	 * milli-seconds (1/1000th of a second).

	 */

	void wait(time_t mill_sec);

	/*

	 * Wakeup any waiters.

	 */

	virtual void wakeup();

private:

	pthread_cond_t	iCondition;

};

#endif