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/*
* The ManaPlus Client
* Copyright (C) 2008-2009 The Mana World Development Team
* Copyright (C) 2009-2010 The Mana Developers
* Copyright (C) 2011-2019 The ManaPlus Developers
*
* This file is part of The ManaPlus Client.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef UTILS_MUTEX_H
#define UTILS_MUTEX_H
#include "logger.h"
/**
* A mutex provides mutual exclusion of access to certain data that is
* accessed by multiple threads.
*/
class Mutex final
{
public:
Mutex();
A_DELETE_COPY(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 final
{
public:
explicit MutexLocker(Mutex *const mutex);
MutexLocker(const MutexLocker &m) :
mMutex(m.mMutex)
{
}
A_DEFAULT_COPY(MutexLocker)
~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 *const mutex) :
mMutex(mutex)
{
if (mMutex != nullptr)
mMutex->lock();
}
inline MutexLocker::~MutexLocker()
{
if (mMutex != nullptr)
mMutex->unlock();
}
#endif // UTILS_MUTEX_H
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