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+/*
+ * The Mana World
+ * Copyright 2008 The Mana World Development Team
+ *
+ * This file is part of The Mana World.
+ *
+ * The Mana World 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.
+ *
+ * The Mana World 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 The Mana World; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef TMW_MUTEX_H
+#define TMW_MUTEX_H
+
+#include <SDL_thread.h>
+
+#include "../log.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 // TMW_MUTEX_H