102 lines
2.2 KiB
C
102 lines
2.2 KiB
C
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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@devolution.com
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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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}
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