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SDL_sysmutex.c
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Sam Lantinga
slouken@devolution.com
*/
#ifdef SAVE_RCSID
static char rcsid =
"@(#) $Id$";
#endif
/* Mutex functions using the Win32 API */
#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#include "SDL_error.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 *)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");
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;
}
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);
}