Mutex.hxx

/*
 * Copyright (C) 2009-2015 Max Kellermann <max@duempel.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the
 * distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
 * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef THREAD_MUTEX_HXX
#define THREAD_MUTEX_HXX

#ifdef WIN32

#include "CriticalSection.hxx"
class Mutex : public CriticalSection {};

#else

#include "PosixMutex.hxx"
class Mutex : public PosixMutex {};

#endif

class ScopeLock {
	Mutex &mutex;

	bool active = true;

public:
	ScopeLock(Mutex &_mutex):mutex(_mutex) {
		mutex.lock();
	};

	~ScopeLock() {
		if (active)
			mutex.unlock();
	};

	ScopeLock(const ScopeLock &other) = delete;
	ScopeLock &operator=(const ScopeLock &other) = delete;

	void Unlock() {
		mutex.unlock();
		active = false;
	}
};

/**
 * Within the scope of an instance, this class will keep a #Mutex
 * unlocked.
 */
class ScopeUnlock {
	Mutex &mutex;

public:
	explicit ScopeUnlock(Mutex &_mutex):mutex(_mutex) {
		mutex.unlock();
	};

	~ScopeUnlock() {
		mutex.lock();
	}

	ScopeUnlock(const ScopeUnlock &other) = delete;
	ScopeUnlock &operator=(const ScopeUnlock &other) = delete;
};

#endif