src/thread/win32/SDL_sysmutex.c
author Sam Lantinga <slouken@libsdl.org>
Fri, 14 Dec 2001 12:38:15 +0000
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997, 1998, 1999, 2000, 2001  Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Library General Public
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    License as published by the Free Software Foundation; either
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    version 2 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Library General Public License for more details.
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    You should have received a copy of the GNU Library General Public
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    License along with this library; if not, write to the Free
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    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#ifdef SAVE_RCSID
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static char rcsid =
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 "@(#) $Id$";
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#endif
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/* Mutex functions using the Win32 API */
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#include <stdio.h>
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#include <stdlib.h>
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#include <windows.h>
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#include "SDL_error.h"
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#include "SDL_mutex.h"
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struct SDL_mutex {
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	HANDLE id;
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};
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/* Create a mutex */
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SDL_mutex *SDL_CreateMutex(void)
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{
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	SDL_mutex *mutex;
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	/* Allocate mutex memory */
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	mutex = (SDL_mutex *)malloc(sizeof(*mutex));
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	if ( mutex ) {
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		/* Create the mutex, with initial value signaled */
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		mutex->id = CreateMutex(NULL, FALSE, NULL);
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		if ( ! mutex->id ) {
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			SDL_SetError("Couldn't create mutex");
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			free(mutex);
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			mutex = NULL;
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		}
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	} else {
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		SDL_OutOfMemory();
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	}
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	return(mutex);
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}
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/* Free the mutex */
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void SDL_DestroyMutex(SDL_mutex *mutex)
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{
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	if ( mutex ) {
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		if ( mutex->id ) {
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			CloseHandle(mutex->id);
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			mutex->id = 0;
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		}
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		free(mutex);
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	}
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}
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/* Lock the mutex */
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int SDL_mutexP(SDL_mutex *mutex)
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{
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	if ( mutex == NULL ) {
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		SDL_SetError("Passed a NULL mutex");
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		return -1;
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	}
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	if ( WaitForSingleObject(mutex->id, INFINITE) == WAIT_FAILED ) {
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		SDL_SetError("Couldn't wait on mutex");
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		return -1;
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	}
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	return(0);
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}
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/* Unlock the mutex */
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int SDL_mutexV(SDL_mutex *mutex)
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{
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	if ( mutex == NULL ) {
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		SDL_SetError("Passed a NULL mutex");
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		return -1;
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	}
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	if ( ReleaseMutex(mutex->id) == FALSE ) {
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		SDL_SetError("Couldn't release mutex");
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		return -1;
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	}
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	return(0);
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}