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/*
* The Mana World
* Copyright (C) 2008-2010 The Mana World Development Team
*
* This file is part of The Mana World.
*
* 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
* 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 MUTEX_H
#define MUTEX_H
#include "log.h"
#include <SDL_thread.h>
/**
* A mutex provides mutual exclusion of access to certain data that is
* accessed by multiple threads.
*/
class Mutex
{
public:
Mutex();
~Mutex();
void lock();
void unlock();
private:
Mutex(const Mutex&); // prevent copying
Mutex& operator=(const Mutex&);
SDL_mutex *mMutex;
};
/**
* A convenience class for locking a mutex.
*/
class MutexLocker
{
public:
MutexLocker(Mutex *mutex);
~MutexLocker();
private:
Mutex *mMutex;
};
inline Mutex::Mutex()
{
mMutex = SDL_CreateMutex();
}
inline Mutex::~Mutex()
{
SDL_DestroyMutex(mMutex);
}
inline void Mutex::lock()
{
if (SDL_mutexP(mMutex) == -1)
logger->log("Mutex locking failed: %s", SDL_GetError());
}
inline void Mutex::unlock()
{
if (SDL_mutexV(mMutex) == -1)
logger->log("Mutex unlocking failed: %s", SDL_GetError());
}
inline MutexLocker::MutexLocker(Mutex *mutex):
mMutex(mutex)
{
mMutex->lock();
}
inline MutexLocker::~MutexLocker()
{
mMutex->unlock();
}
#endif // MUTEX_H
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