src/thread/win32/SDL_sysmutex.c
changeset 0 74212992fb08
child 252 e8157fcb3114
     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/thread/win32/SDL_sysmutex.c	Thu Apr 26 16:45:43 2001 +0000
     1.3 @@ -0,0 +1,101 @@
     1.4 +/*
     1.5 +    SDL - Simple DirectMedia Layer
     1.6 +    Copyright (C) 1997, 1998, 1999, 2000, 2001  Sam Lantinga
     1.7 +
     1.8 +    This library is free software; you can redistribute it and/or
     1.9 +    modify it under the terms of the GNU Library General Public
    1.10 +    License as published by the Free Software Foundation; either
    1.11 +    version 2 of the License, or (at your option) any later version.
    1.12 +
    1.13 +    This library is distributed in the hope that it will be useful,
    1.14 +    but WITHOUT ANY WARRANTY; without even the implied warranty of
    1.15 +    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    1.16 +    Library General Public License for more details.
    1.17 +
    1.18 +    You should have received a copy of the GNU Library General Public
    1.19 +    License along with this library; if not, write to the Free
    1.20 +    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
    1.21 +
    1.22 +    Sam Lantinga
    1.23 +    slouken@devolution.com
    1.24 +*/
    1.25 +
    1.26 +#ifdef SAVE_RCSID
    1.27 +static char rcsid =
    1.28 + "@(#) $Id$";
    1.29 +#endif
    1.30 +
    1.31 +/* Mutex functions using the Win32 API */
    1.32 +
    1.33 +#include <stdio.h>
    1.34 +#include <stdlib.h>
    1.35 +#include <windows.h>
    1.36 +
    1.37 +#include "SDL_error.h"
    1.38 +#include "SDL_mutex.h"
    1.39 +
    1.40 +
    1.41 +struct SDL_mutex {
    1.42 +	HANDLE id;
    1.43 +};
    1.44 +
    1.45 +/* Create a mutex */
    1.46 +SDL_mutex *SDL_CreateMutex(void)
    1.47 +{
    1.48 +	SDL_mutex *mutex;
    1.49 +
    1.50 +	/* Allocate mutex memory */
    1.51 +	mutex = (SDL_mutex *)malloc(sizeof(*mutex));
    1.52 +	if ( mutex ) {
    1.53 +		/* Create the mutex, with initial value signaled */
    1.54 +		mutex->id = CreateMutex(NULL, FALSE, NULL);
    1.55 +		if ( ! mutex->id ) {
    1.56 +			SDL_SetError("Couldn't create mutex");
    1.57 +			free(mutex);
    1.58 +			mutex = NULL;
    1.59 +		}
    1.60 +	} else {
    1.61 +		SDL_OutOfMemory();
    1.62 +	}
    1.63 +	return(mutex);
    1.64 +}
    1.65 +
    1.66 +/* Free the mutex */
    1.67 +void SDL_DestroyMutex(SDL_mutex *mutex)
    1.68 +{
    1.69 +	if ( mutex ) {
    1.70 +		if ( mutex->id ) {
    1.71 +			CloseHandle(mutex->id);
    1.72 +			mutex->id = 0;
    1.73 +		}
    1.74 +		free(mutex);
    1.75 +	}
    1.76 +}
    1.77 +
    1.78 +/* Lock the mutex */
    1.79 +int SDL_mutexP(SDL_mutex *mutex)
    1.80 +{
    1.81 +	if ( mutex == NULL ) {
    1.82 +		SDL_SetError("Passed a NULL mutex");
    1.83 +		return -1;
    1.84 +	}
    1.85 +	if ( WaitForSingleObject(mutex->id, INFINITE) == WAIT_FAILED ) {
    1.86 +		SDL_SetError("Couldn't wait on mutex");
    1.87 +		return -1;
    1.88 +	}
    1.89 +	return(0);
    1.90 +}
    1.91 +
    1.92 +/* Unlock the mutex */
    1.93 +int SDL_mutexV(SDL_mutex *mutex)
    1.94 +{
    1.95 +	if ( mutex == NULL ) {
    1.96 +		SDL_SetError("Passed a NULL mutex");
    1.97 +		return -1;
    1.98 +	}
    1.99 +	if ( ReleaseMutex(mutex->id) == FALSE ) {
   1.100 +		SDL_SetError("Couldn't release mutex");
   1.101 +		return -1;
   1.102 +	}
   1.103 +	return(0);
   1.104 +}