/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997-2006 Sam Lantinga

    This library is free software; you can redistribute it and/or

    modify it under the terms of the GNU Lesser General Public

    License as published by the Free Software Foundation; either

    version 2.1 of the License, or (at your option) any later version.

    This library 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

    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public

    License along with this library; if not, write to the Free Software

    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga

    slouken@libsdl.org

*/

#include "SDL_config.h"

/* Mutex functions using the Win32 API */

#define WIN32_LEAN_AND_MEAN

#include <windows.h>

#include "SDL_mutex.h"

struct SDL_mutex {

	HANDLE id;

};

/* Create a mutex */

SDL_mutex *SDL_CreateMutex(void)

{

	SDL_mutex *mutex;

	/* Allocate mutex memory */

	mutex = (SDL_mutex *)SDL_malloc(sizeof(*mutex));

	if ( mutex ) {

		/* Create the mutex, with initial value signaled */

		mutex->id = CreateMutex(NULL, FALSE, NULL);

		if ( ! mutex->id ) {

			SDL_SetError("Couldn't create mutex");

			SDL_free(mutex);

			mutex = NULL;

		}

	} else {

		SDL_OutOfMemory();

	}

	return(mutex);

}

/* Free the mutex */

void SDL_DestroyMutex(SDL_mutex *mutex)

{

	if ( mutex ) {

		if ( mutex->id ) {

			CloseHandle(mutex->id);

			mutex->id = 0;

		}

		SDL_free(mutex);

	}

}

/* Lock the mutex */

int SDL_mutexP(SDL_mutex *mutex)

{

	if ( mutex == NULL ) {

		SDL_SetError("Passed a NULL mutex");

		return -1;

	}

	if ( WaitForSingleObject(mutex->id, INFINITE) == WAIT_FAILED ) {

		SDL_SetError("Couldn't wait on mutex");

		return -1;

	}

	return(0);

}

/* Unlock the mutex */

int SDL_mutexV(SDL_mutex *mutex)

{

	if ( mutex == NULL ) {

		SDL_SetError("Passed a NULL mutex");

		return -1;

	}

	if ( ReleaseMutex(mutex->id) == FALSE ) {

		SDL_SetError("Couldn't release mutex");

		return -1;

	}

	return(0);

}