diff options
Diffstat (limited to 'apps/plugins/sdl/src/thread/os2/SDL_syssem.c')
-rw-r--r-- | apps/plugins/sdl/src/thread/os2/SDL_syssem.c | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/apps/plugins/sdl/src/thread/os2/SDL_syssem.c b/apps/plugins/sdl/src/thread/os2/SDL_syssem.c new file mode 100644 index 0000000000..d6dfba67bb --- /dev/null +++ b/apps/plugins/sdl/src/thread/os2/SDL_syssem.c | |||
@@ -0,0 +1,192 @@ | |||
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 OS/2 API */ | ||
25 | |||
26 | #define INCL_DOS | ||
27 | #define INCL_DOSERRORS | ||
28 | #define INCL_DOSSEMAPHORES | ||
29 | #include <os2.h> | ||
30 | |||
31 | #include "SDL_thread.h" | ||
32 | #include "SDL_timer.h" | ||
33 | |||
34 | |||
35 | struct SDL_semaphore { | ||
36 | HMTX id; | ||
37 | HEV changed; | ||
38 | Uint32 value; | ||
39 | }; | ||
40 | |||
41 | |||
42 | /* Create a semaphore */ | ||
43 | DECLSPEC SDL_sem * SDLCALL SDL_CreateSemaphore(Uint32 initial_value) | ||
44 | { | ||
45 | SDL_sem *sem; | ||
46 | ULONG ulrc; | ||
47 | |||
48 | /* Allocate sem memory */ | ||
49 | sem = (SDL_sem *)SDL_malloc(sizeof(*sem)); | ||
50 | if ( sem ) { | ||
51 | /* Create the mutex semaphore */ | ||
52 | ulrc = DosCreateMutexSem(NULL,&(sem->id),0,TRUE); | ||
53 | if ( ulrc ) { | ||
54 | SDL_SetError("Couldn't create semaphore"); | ||
55 | SDL_free(sem); | ||
56 | sem = NULL; | ||
57 | } else | ||
58 | { | ||
59 | DosCreateEventSem(NULL, &(sem->changed), 0, FALSE); | ||
60 | sem->value = initial_value; | ||
61 | DosReleaseMutexSem(sem->id); | ||
62 | } | ||
63 | } else { | ||
64 | SDL_OutOfMemory(); | ||
65 | } | ||
66 | return(sem); | ||
67 | } | ||
68 | |||
69 | /* Free the semaphore */ | ||
70 | DECLSPEC void SDLCALL SDL_DestroySemaphore(SDL_sem *sem) | ||
71 | { | ||
72 | if ( sem ) { | ||
73 | if ( sem->id ) { | ||
74 | DosCloseEventSem(sem->changed); | ||
75 | DosCloseMutexSem(sem->id); | ||
76 | sem->id = 0; | ||
77 | } | ||
78 | SDL_free(sem); | ||
79 | } | ||
80 | } | ||
81 | |||
82 | DECLSPEC int SDLCALL SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) | ||
83 | { | ||
84 | ULONG ulrc; | ||
85 | |||
86 | if ( ! sem ) { | ||
87 | SDL_SetError("Passed a NULL sem"); | ||
88 | return -1; | ||
89 | } | ||
90 | |||
91 | if ( timeout == SDL_MUTEX_MAXWAIT ) { | ||
92 | while (1) { | ||
93 | ulrc = DosRequestMutexSem(sem->id, SEM_INDEFINITE_WAIT); | ||
94 | if (ulrc) { | ||
95 | /* if error waiting mutex */ | ||
96 | SDL_SetError("DosRequestMutexSem() failed"); | ||
97 | return -1; | ||
98 | } else if (sem->value) { | ||
99 | sem->value--; | ||
100 | DosReleaseMutexSem(sem->id); | ||
101 | return 0; | ||
102 | } else { | ||
103 | ULONG ulPostCount; | ||
104 | DosResetEventSem(sem->changed, &ulPostCount); | ||
105 | DosReleaseMutexSem(sem->id); | ||
106 | /* continue waiting until somebody posts the semaphore */ | ||
107 | DosWaitEventSem(sem->changed, SEM_INDEFINITE_WAIT); | ||
108 | } | ||
109 | } | ||
110 | } else | ||
111 | if ( timeout == 0 ) | ||
112 | { | ||
113 | ulrc = DosRequestMutexSem(sem->id, SEM_INDEFINITE_WAIT); | ||
114 | if (ulrc==NO_ERROR) | ||
115 | { | ||
116 | if (sem->value) | ||
117 | { | ||
118 | sem->value--; | ||
119 | DosReleaseMutexSem(sem->id); | ||
120 | return 0; | ||
121 | } else | ||
122 | { | ||
123 | DosReleaseMutexSem(sem->id); | ||
124 | return SDL_MUTEX_TIMEDOUT; | ||
125 | } | ||
126 | } else | ||
127 | { | ||
128 | SDL_SetError("DosRequestMutexSem() failed"); | ||
129 | return -1; | ||
130 | } | ||
131 | } else { | ||
132 | ulrc = DosRequestMutexSem(sem->id, SEM_INDEFINITE_WAIT); | ||
133 | if (ulrc) { | ||
134 | /* if error waiting mutex */ | ||
135 | SDL_SetError("DosRequestMutexSem() failed"); | ||
136 | return -1; | ||
137 | } else | ||
138 | if (sem->value) { | ||
139 | sem->value--; | ||
140 | DosReleaseMutexSem(sem->id); | ||
141 | return 0; | ||
142 | } else { | ||
143 | ULONG ulPostCount; | ||
144 | DosResetEventSem(sem->changed, &ulPostCount); | ||
145 | DosReleaseMutexSem(sem->id); | ||
146 | /* continue waiting until somebody posts the semaphore */ | ||
147 | ulrc = DosWaitEventSem(sem->changed, timeout); | ||
148 | if (ulrc==NO_ERROR) | ||
149 | return 0; | ||
150 | else | ||
151 | return SDL_MUTEX_TIMEDOUT; | ||
152 | } | ||
153 | } | ||
154 | /* never reached */ | ||
155 | return -1; | ||
156 | } | ||
157 | |||
158 | DECLSPEC int SDLCALL SDL_SemTryWait(SDL_sem *sem) | ||
159 | { | ||
160 | return SDL_SemWaitTimeout(sem, 0); | ||
161 | } | ||
162 | |||
163 | DECLSPEC int SDLCALL SDL_SemWait(SDL_sem *sem) | ||
164 | { | ||
165 | return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT); | ||
166 | } | ||
167 | |||
168 | /* Returns the current count of the semaphore */ | ||
169 | DECLSPEC Uint32 SDLCALL SDL_SemValue(SDL_sem *sem) | ||
170 | { | ||
171 | if ( ! sem ) { | ||
172 | SDL_SetError("Passed a NULL sem"); | ||
173 | return 0; | ||
174 | } | ||
175 | return sem->value; | ||
176 | } | ||
177 | |||
178 | DECLSPEC int SDLCALL SDL_SemPost(SDL_sem *sem) | ||
179 | { | ||
180 | if ( ! sem ) { | ||
181 | SDL_SetError("Passed a NULL sem"); | ||
182 | return -1; | ||
183 | } | ||
184 | if ( DosRequestMutexSem(sem->id,SEM_INDEFINITE_WAIT) ) { | ||
185 | SDL_SetError("DosRequestMutexSem() failed"); | ||
186 | return -1; | ||
187 | } | ||
188 | sem->value++; | ||
189 | DosPostEventSem(sem->changed); | ||
190 | DosReleaseMutexSem(sem->id); | ||
191 | return 0; | ||
192 | } | ||