e14743d1 |
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 | } |