/*
    PIP - Platform Independent Primitives
    Mutex
    Copyright (C) 2011  Ivan Pelipenko peri4ko@gmail.com

    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 3 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, see <http://www.gnu.org/licenses/>.
*/

#ifndef PIMUTEX_H
#define PIMUTEX_H

#include "piincludes.h"
#ifdef CC_GCC
#include <pthread.h>
#endif

class PIMutex
{
public:
#ifndef WINDOWS
	PIMutex() {
		pthread_mutexattr_t attr;
		pthread_mutexattr_init(&attr);
		//pthread_mutexattr_settype(&attr, PTHREAD_PROCESS_SHARED);
		pthread_mutex_init(&mutex, &attr);
		pthread_mutexattr_destroy(&attr);
	}
	~PIMutex() {pthread_mutex_destroy(&mutex);}
	
	void lock() {pthread_mutex_lock(&mutex);}
	void unlock() {pthread_mutex_unlock(&mutex);}
	bool tryLock() {return (pthread_mutex_trylock(&mutex) == 0);}
#else
	PIMutex() {mutex = CreateMutex(0, false, 0);}
	~PIMutex() {CloseHandle(mutex);}
	
	void lock() {WaitForSingleObject(mutex, INFINITE);}
	void unlock() {ReleaseMutex(mutex);}
	bool tryLock() {return (WaitForSingleObject(mutex, 0) == WAIT_OBJECT_0);}
#endif
	
private:
#ifndef WINDOWS
	pthread_mutex_t mutex;
#else
	void * mutex;
#endif
	
};

class PIMutexLocker
{
public:
	PIMutexLocker(PIMutex * m): mutex(m) {mutex->lock();}
	PIMutexLocker(PIMutex & m): mutex(&m) {mutex->lock();}
	~PIMutexLocker() {mutex->unlock();}
private:
	PIMutex * mutex;
};

#endif // PIMUTEX_H