diff options
Diffstat (limited to 'apps/plugins/sdl/src/thread/win32/SDL_syssem.c')
-rw-r--r-- | apps/plugins/sdl/src/thread/win32/SDL_syssem.c | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/apps/plugins/sdl/src/thread/win32/SDL_syssem.c b/apps/plugins/sdl/src/thread/win32/SDL_syssem.c new file mode 100644 index 0000000000..261d24cbfe --- /dev/null +++ b/apps/plugins/sdl/src/thread/win32/SDL_syssem.c | |||
@@ -0,0 +1,164 @@ | |||
1 | /* | ||
2 | SDL - Simple DirectMedia Layer | ||
3 | Copyright (C) 1997-2012 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 | /* Semaphore functions using the Win32 API */ | ||
25 | |||
26 | #define WIN32_LEAN_AND_MEAN | ||
27 | #include <windows.h> | ||
28 | |||
29 | #include "SDL_thread.h" | ||
30 | #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) | ||
31 | #include "win_ce_semaphore.h" | ||
32 | #endif | ||
33 | |||
34 | |||
35 | struct SDL_semaphore { | ||
36 | #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) | ||
37 | SYNCHHANDLE id; | ||
38 | #else | ||
39 | HANDLE id; | ||
40 | #endif | ||
41 | volatile LONG count; | ||
42 | }; | ||
43 | |||
44 | |||
45 | /* Create a semaphore */ | ||
46 | SDL_sem *SDL_CreateSemaphore(Uint32 initial_value) | ||
47 | { | ||
48 | SDL_sem *sem; | ||
49 | |||
50 | /* Allocate sem memory */ | ||
51 | sem = (SDL_sem *)SDL_malloc(sizeof(*sem)); | ||
52 | if ( sem ) { | ||
53 | /* Create the semaphore, with max value 32K */ | ||
54 | #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) | ||
55 | sem->id = CreateSemaphoreCE(NULL, initial_value, 32*1024, NULL); | ||
56 | #else | ||
57 | sem->id = CreateSemaphore(NULL, initial_value, 32*1024, NULL); | ||
58 | #endif | ||
59 | sem->count = (LONG) initial_value; | ||
60 | if ( ! sem->id ) { | ||
61 | SDL_SetError("Couldn't create semaphore"); | ||
62 | SDL_free(sem); | ||
63 | sem = NULL; | ||
64 | } | ||
65 | } else { | ||
66 | SDL_OutOfMemory(); | ||
67 | } | ||
68 | return(sem); | ||
69 | } | ||
70 | |||
71 | /* Free the semaphore */ | ||
72 | void SDL_DestroySemaphore(SDL_sem *sem) | ||
73 | { | ||
74 | if ( sem ) { | ||
75 | if ( sem->id ) { | ||
76 | #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) | ||
77 | CloseSynchHandle(sem->id); | ||
78 | #else | ||
79 | CloseHandle(sem->id); | ||
80 | #endif | ||
81 | sem->id = 0; | ||
82 | } | ||
83 | SDL_free(sem); | ||
84 | } | ||
85 | } | ||
86 | |||
87 | int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) | ||
88 | { | ||
89 | int retval; | ||
90 | DWORD dwMilliseconds; | ||
91 | |||
92 | if ( ! sem ) { | ||
93 | SDL_SetError("Passed a NULL sem"); | ||
94 | return -1; | ||
95 | } | ||
96 | |||
97 | if ( timeout == SDL_MUTEX_MAXWAIT ) { | ||
98 | dwMilliseconds = INFINITE; | ||
99 | } else { | ||
100 | dwMilliseconds = (DWORD)timeout; | ||
101 | } | ||
102 | #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) | ||
103 | switch (WaitForSemaphoreCE(sem->id, dwMilliseconds)) { | ||
104 | #else | ||
105 | switch (WaitForSingleObject(sem->id, dwMilliseconds)) { | ||
106 | #endif | ||
107 | case WAIT_OBJECT_0: | ||
108 | InterlockedDecrement(&sem->count); | ||
109 | retval = 0; | ||
110 | break; | ||
111 | case WAIT_TIMEOUT: | ||
112 | retval = SDL_MUTEX_TIMEDOUT; | ||
113 | break; | ||
114 | default: | ||
115 | SDL_SetError("WaitForSingleObject() failed"); | ||
116 | retval = -1; | ||
117 | break; | ||
118 | } | ||
119 | return retval; | ||
120 | } | ||
121 | |||
122 | int SDL_SemTryWait(SDL_sem *sem) | ||
123 | { | ||
124 | return SDL_SemWaitTimeout(sem, 0); | ||
125 | } | ||
126 | |||
127 | int SDL_SemWait(SDL_sem *sem) | ||
128 | { | ||
129 | return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT); | ||
130 | } | ||
131 | |||
132 | /* Returns the current count of the semaphore */ | ||
133 | Uint32 SDL_SemValue(SDL_sem *sem) | ||
134 | { | ||
135 | if ( ! sem ) { | ||
136 | SDL_SetError("Passed a NULL sem"); | ||
137 | return 0; | ||
138 | } | ||
139 | return (Uint32) sem->count; | ||
140 | } | ||
141 | |||
142 | int SDL_SemPost(SDL_sem *sem) | ||
143 | { | ||
144 | if ( ! sem ) { | ||
145 | SDL_SetError("Passed a NULL sem"); | ||
146 | return -1; | ||
147 | } | ||
148 | /* Increase the counter in the first place, because | ||
149 | * after a successful release the semaphore may | ||
150 | * immediately get destroyed by another thread which | ||
151 | * is waiting for this semaphore. | ||
152 | */ | ||
153 | InterlockedIncrement(&sem->count); | ||
154 | #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) | ||
155 | if ( ReleaseSemaphoreCE(sem->id, 1, NULL) == FALSE ) { | ||
156 | #else | ||
157 | if ( ReleaseSemaphore(sem->id, 1, NULL) == FALSE ) { | ||
158 | #endif | ||
159 | InterlockedDecrement(&sem->count); /* restore */ | ||
160 | SDL_SetError("ReleaseSemaphore() failed"); | ||
161 | return -1; | ||
162 | } | ||
163 | return 0; | ||
164 | } | ||