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comparison src/thread/win32/SDL_sysmutex.c @ 0:74212992fb08

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Initial revision
author Sam Lantinga <slouken@lokigames.com>
date Thu, 26 Apr 2001 16:45:43 +0000
parents
children e8157fcb3114
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-1:000000000000 0:74212992fb08
1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
4
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public
7 License as published by the Free Software Foundation; either
8 version 2 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 Library General Public License for more details.
14
15 You should have received a copy of the GNU Library General Public
16 License along with this library; if not, write to the Free
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18
19 Sam Lantinga
20 slouken@devolution.com
21 */
22
23 #ifdef SAVE_RCSID
24 static char rcsid =
25 "@(#) $Id$";
26 #endif
27
28 /* Mutex functions using the Win32 API */
29
30 #include <stdio.h>
31 #include <stdlib.h>
32 #include <windows.h>
33
34 #include "SDL_error.h"
35 #include "SDL_mutex.h"
36
37
38 struct SDL_mutex {
39 HANDLE id;
40 };
41
42 /* Create a mutex */
43 SDL_mutex *SDL_CreateMutex(void)
44 {
45 SDL_mutex *mutex;
46
47 /* Allocate mutex memory */
48 mutex = (SDL_mutex *)malloc(sizeof(*mutex));
49 if ( mutex ) {
50 /* Create the mutex, with initial value signaled */
51 mutex->id = CreateMutex(NULL, FALSE, NULL);
52 if ( ! mutex->id ) {
53 SDL_SetError("Couldn't create mutex");
54 free(mutex);
55 mutex = NULL;
56 }
57 } else {
58 SDL_OutOfMemory();
59 }
60 return(mutex);
61 }
62
63 /* Free the mutex */
64 void SDL_DestroyMutex(SDL_mutex *mutex)
65 {
66 if ( mutex ) {
67 if ( mutex->id ) {
68 CloseHandle(mutex->id);
69 mutex->id = 0;
70 }
71 free(mutex);
72 }
73 }
74
75 /* Lock the mutex */
76 int SDL_mutexP(SDL_mutex *mutex)
77 {
78 if ( mutex == NULL ) {
79 SDL_SetError("Passed a NULL mutex");
80 return -1;
81 }
82 if ( WaitForSingleObject(mutex->id, INFINITE) == WAIT_FAILED ) {
83 SDL_SetError("Couldn't wait on mutex");
84 return -1;
85 }
86 return(0);
87 }
88
89 /* Unlock the mutex */
90 int SDL_mutexV(SDL_mutex *mutex)
91 {
92 if ( mutex == NULL ) {
93 SDL_SetError("Passed a NULL mutex");
94 return -1;
95 }
96 if ( ReleaseMutex(mutex->id) == FALSE ) {
97 SDL_SetError("Couldn't release mutex");
98 return -1;
99 }
100 return(0);
101 }