/*
 * CINELERRA
 * Copyright (C) 2008 Adam Williams <broadcast at earthling dot net>
 * 
 * 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
 * 
 */

#ifndef CONDITION_H
#define CONDITION_H

#include <pthread.h>

class Condition
{
public:
	Condition(int init_value = 0, const char *title = 0, int is_binary = 0);
	~Condition();

// Reset to init_value whether locked or not.
	void reset();
// Block if value <= 0, then decrease value
	void lock(const char *location = 0);
// Increase value
	void unlock();
// Block for requested duration if value <= 0.
// value is decreased whether or not the condition is unlocked in time
// Returns 1 if timeout or 0 if success.
	int timed_lock(int microseconds, const char *location = 0);
	int get_value();

	pthread_cond_t cond;
	pthread_mutex_t mutex;
	int value;
	int init_value;
	int is_binary;
	const char *title;
};

class cLock
{
	Condition &cond;
public:
	cLock(Condition &c) : cond(c) { cond.lock(); }
	cLock(Condition *c) : cond(*c) { cond.lock(); }
	~cLock() { cond.unlock(); }
};


#endif