/* * The ManaPlus Client * Copyright (C) 2008-2009 The Mana World Development Team * Copyright (C) 2009-2010 The Mana Developers * Copyright (C) 2011 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 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