src/thread/win32/SDL_sysmutex.c
author Sam Lantinga <slouken@libsdl.org>
Mon, 21 Sep 2009 08:58:51 +0000
branchSDL-1.2
changeset 4214 4250beeb5ad1
parent 4159 a1b03ba2fcd0
child 6137 4720145f848b
permissions -rw-r--r--
Oh yeah, we have GLX support too.
     1 /*
     2     SDL - Simple DirectMedia Layer
     3     Copyright (C) 1997-2009 Sam Lantinga
     4 
     5     This library is free software; you can redistribute it and/or
     6     modify it under the terms of the GNU Lesser General Public
     7     License as published by the Free Software Foundation; either
     8     version 2.1 of the License, or (at your option) any later version.
     9 
    10     This library is distributed in the hope that it will be useful,
    11     but WITHOUT ANY WARRANTY; without even the implied warranty of
    12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    13     Lesser General Public License for more details.
    14 
    15     You should have received a copy of the GNU Lesser General Public
    16     License along with this library; if not, write to the Free Software
    17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
    18 
    19     Sam Lantinga
    20     slouken@libsdl.org
    21 */
    22 #include "SDL_config.h"
    23 
    24 /* Mutex functions using the Win32 API */
    25 
    26 #define WIN32_LEAN_AND_MEAN
    27 #include <windows.h>
    28 
    29 #include "SDL_mutex.h"
    30 
    31 
    32 struct SDL_mutex {
    33 	HANDLE id;
    34 };
    35 
    36 /* Create a mutex */
    37 SDL_mutex *SDL_CreateMutex(void)
    38 {
    39 	SDL_mutex *mutex;
    40 
    41 	/* Allocate mutex memory */
    42 	mutex = (SDL_mutex *)SDL_malloc(sizeof(*mutex));
    43 	if ( mutex ) {
    44 		/* Create the mutex, with initial value signaled */
    45 		mutex->id = CreateMutex(NULL, FALSE, NULL);
    46 		if ( ! mutex->id ) {
    47 			SDL_SetError("Couldn't create mutex");
    48 			SDL_free(mutex);
    49 			mutex = NULL;
    50 		}
    51 	} else {
    52 		SDL_OutOfMemory();
    53 	}
    54 	return(mutex);
    55 }
    56 
    57 /* Free the mutex */
    58 void SDL_DestroyMutex(SDL_mutex *mutex)
    59 {
    60 	if ( mutex ) {
    61 		if ( mutex->id ) {
    62 			CloseHandle(mutex->id);
    63 			mutex->id = 0;
    64 		}
    65 		SDL_free(mutex);
    66 	}
    67 }
    68 
    69 /* Lock the mutex */
    70 int SDL_mutexP(SDL_mutex *mutex)
    71 {
    72 	if ( mutex == NULL ) {
    73 		SDL_SetError("Passed a NULL mutex");
    74 		return -1;
    75 	}
    76 	if ( WaitForSingleObject(mutex->id, INFINITE) == WAIT_FAILED ) {
    77 		SDL_SetError("Couldn't wait on mutex");
    78 		return -1;
    79 	}
    80 	return(0);
    81 }
    82 
    83 /* Unlock the mutex */
    84 int SDL_mutexV(SDL_mutex *mutex)
    85 {
    86 	if ( mutex == NULL ) {
    87 		SDL_SetError("Passed a NULL mutex");
    88 		return -1;
    89 	}
    90 	if ( ReleaseMutex(mutex->id) == FALSE ) {
    91 		SDL_SetError("Couldn't release mutex");
    92 		return -1;
    93 	}
    94 	return(0);
    95 }