/*
*	DSFML - SFML Library wrapper for the D programming language.
*	Copyright (C) 2008 Julien Dagorn (sirjulio13@gmail.com)
*	Copyright (C) 2010 Andreas Hollandt
*
*	This software is provided 'as-is', without any express or
*	implied warranty. In no event will the authors be held
*	liable for any damages arising from the use of this software.
*
*	Permission is granted to anyone to use this software for any purpose,
*	including commercial applications, and to alter it and redistribute
*	it freely, subject to the following restrictions:
*
*	1.  The origin of this software must not be misrepresented;
*		you must not claim that you wrote the original software.
*		If you use this software in a product, an acknowledgment
*		in the product documentation would be appreciated but
*		is not required.
*
*	2.  Altered source versions must be plainly marked as such,
*		and must not be misrepresented as being the original software.
*
*	3.  This notice may not be removed or altered from any
*		source distribution.
*/

module dsfml.system.mutex;

import dsfml.system.common;

/**
*	Provide portable implementation of Mutual Exclusion object.
*	
*	Uses CriticalSection on Windows and pthread mutexes on linux.
*/
final class Mutex : DSFMLObject
{
	/**
	*	Constructor
	*/	
	this()
	{
		super(sfMutex_Create());
	}

	override void dispose()
	{
		sfMutex_Destroy(m_ptr);
	}

	/**
	*	Lock the mutex
	*	
	*	Can be called multiples times, but each lock must be unlocked with unlock()		
	*/		
	void lock()
	{
		sfMutex_Lock(m_ptr);
	}
	
	/**
	*	Unlock the mutex
	*/		
	void unlock()
	{
		sfMutex_Unlock(m_ptr);
	}

private:

// External ====================================================================

	extern (C)
	{
		typedef void* function() pf_sfMutex_Create;
		typedef void function(void*) pf_sfMutex_Destroy;
		typedef void function(void*) pf_sfMutex_Lock;
		typedef void function(void*) pf_sfMutex_Unlock;
		
		static pf_sfMutex_Create sfMutex_Create; 
		static pf_sfMutex_Destroy sfMutex_Destroy;
		static pf_sfMutex_Lock sfMutex_Lock;	
		static pf_sfMutex_Unlock sfMutex_Unlock; 
	}

	static this()
	{
	debug
		DllLoader dll = DllLoader.load("csfml-system-d");
	else
		DllLoader dll = DllLoader.load("csfml-system");
		
		sfMutex_Create = cast(pf_sfMutex_Create)dll.getSymbol("sfMutex_Create"); 
		sfMutex_Destroy = cast(pf_sfMutex_Destroy)dll.getSymbol("sfMutex_Destroy");
		sfMutex_Lock = cast(pf_sfMutex_Lock)dll.getSymbol("sfMutex_Lock");	
		sfMutex_Unlock = cast(pf_sfMutex_Unlock)dll.getSymbol("sfMutex_Unlock"); 
	}
}