diff options
Diffstat (limited to 'apps/plugins/sdl/src/thread/riscos/SDL_syssem.c')
-rw-r--r-- | apps/plugins/sdl/src/thread/riscos/SDL_syssem.c | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/apps/plugins/sdl/src/thread/riscos/SDL_syssem.c b/apps/plugins/sdl/src/thread/riscos/SDL_syssem.c new file mode 100644 index 0000000000..127211bf76 --- /dev/null +++ b/apps/plugins/sdl/src/thread/riscos/SDL_syssem.c | |||
@@ -0,0 +1,203 @@ | |||
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 | |||
23 | #include <errno.h> | ||
24 | |||
25 | #include "SDL_config.h" | ||
26 | |||
27 | /* RISC OS semiphores based on linux code */ | ||
28 | |||
29 | |||
30 | #include "SDL_timer.h" | ||
31 | #include "SDL_thread.h" | ||
32 | #include "SDL_systhread_c.h" | ||
33 | |||
34 | #if !SDL_THREADS_DISABLED | ||
35 | |||
36 | SDL_sem *SDL_CreateSemaphore(Uint32 initial_value) | ||
37 | { | ||
38 | SDL_SetError("SDL not configured with thread support"); | ||
39 | return (SDL_sem *)0; | ||
40 | } | ||
41 | |||
42 | void SDL_DestroySemaphore(SDL_sem *sem) | ||
43 | { | ||
44 | return; | ||
45 | } | ||
46 | |||
47 | int SDL_SemTryWait(SDL_sem *sem) | ||
48 | { | ||
49 | SDL_SetError("SDL not configured with thread support"); | ||
50 | return -1; | ||
51 | } | ||
52 | |||
53 | int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) | ||
54 | { | ||
55 | SDL_SetError("SDL not configured with thread support"); | ||
56 | return -1; | ||
57 | } | ||
58 | |||
59 | int SDL_SemWait(SDL_sem *sem) | ||
60 | { | ||
61 | SDL_SetError("SDL not configured with thread support"); | ||
62 | return -1; | ||
63 | } | ||
64 | |||
65 | Uint32 SDL_SemValue(SDL_sem *sem) | ||
66 | { | ||
67 | return 0; | ||
68 | } | ||
69 | |||
70 | int SDL_SemPost(SDL_sem *sem) | ||
71 | { | ||
72 | SDL_SetError("SDL not configured with thread support"); | ||
73 | return -1; | ||
74 | } | ||
75 | |||
76 | #else | ||
77 | |||
78 | |||
79 | #include <unistd.h> /* For getpid() */ | ||
80 | #include <pthread.h> | ||
81 | #include <semaphore.h> | ||
82 | |||
83 | struct SDL_semaphore { | ||
84 | sem_t *sem; | ||
85 | sem_t sem_data; | ||
86 | }; | ||
87 | |||
88 | /* Create a semaphore, initialized with value */ | ||
89 | SDL_sem *SDL_CreateSemaphore(Uint32 initial_value) | ||
90 | { | ||
91 | SDL_sem *sem = (SDL_sem *) SDL_malloc(sizeof(SDL_sem)); | ||
92 | if ( sem ) { | ||
93 | if ( sem_init(&sem->sem_data, 0, initial_value) < 0 ) { | ||
94 | SDL_SetError("sem_init() failed"); | ||
95 | SDL_free(sem); | ||
96 | sem = NULL; | ||
97 | } else { | ||
98 | sem->sem = &sem->sem_data; | ||
99 | } | ||
100 | } else { | ||
101 | SDL_OutOfMemory(); | ||
102 | } | ||
103 | return sem; | ||
104 | } | ||
105 | |||
106 | void SDL_DestroySemaphore(SDL_sem *sem) | ||
107 | { | ||
108 | if ( sem ) { | ||
109 | sem_destroy(sem->sem); | ||
110 | SDL_free(sem); | ||
111 | } | ||
112 | } | ||
113 | |||
114 | int SDL_SemTryWait(SDL_sem *sem) | ||
115 | { | ||
116 | int retval; | ||
117 | |||
118 | if ( ! sem ) { | ||
119 | SDL_SetError("Passed a NULL semaphore"); | ||
120 | return -1; | ||
121 | } | ||
122 | retval = SDL_MUTEX_TIMEDOUT; | ||
123 | if ( sem_trywait(sem->sem) == 0 ) { | ||
124 | retval = 0; | ||
125 | } | ||
126 | return retval; | ||
127 | } | ||
128 | |||
129 | int SDL_SemWait(SDL_sem *sem) | ||
130 | { | ||
131 | int retval; | ||
132 | |||
133 | if ( ! sem ) { | ||
134 | SDL_SetError("Passed a NULL semaphore"); | ||
135 | return -1; | ||
136 | } | ||
137 | |||
138 | while ( ((retval = sem_wait(sem->sem)) == -1) && (errno == EINTR) ) {} | ||
139 | if ( retval < 0 ) { | ||
140 | SDL_SetError("sem_wait() failed"); | ||
141 | } | ||
142 | return retval; | ||
143 | } | ||
144 | |||
145 | int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) | ||
146 | { | ||
147 | int retval; | ||
148 | |||
149 | if ( ! sem ) { | ||
150 | SDL_SetError("Passed a NULL semaphore"); | ||
151 | return -1; | ||
152 | } | ||
153 | |||
154 | /* Try the easy cases first */ | ||
155 | if ( timeout == 0 ) { | ||
156 | return SDL_SemTryWait(sem); | ||
157 | } | ||
158 | if ( timeout == SDL_MUTEX_MAXWAIT ) { | ||
159 | return SDL_SemWait(sem); | ||
160 | } | ||
161 | |||
162 | /* Ack! We have to busy wait... */ | ||
163 | timeout += SDL_GetTicks(); | ||
164 | do { | ||
165 | retval = SDL_SemTryWait(sem); | ||
166 | if ( retval == 0 ) { | ||
167 | break; | ||
168 | } | ||
169 | SDL_Delay(1); | ||
170 | } while ( SDL_GetTicks() < timeout ); | ||
171 | |||
172 | return retval; | ||
173 | } | ||
174 | |||
175 | Uint32 SDL_SemValue(SDL_sem *sem) | ||
176 | { | ||
177 | int ret = 0; | ||
178 | if ( sem ) { | ||
179 | sem_getvalue(sem->sem, &ret); | ||
180 | if ( ret < 0 ) { | ||
181 | ret = 0; | ||
182 | } | ||
183 | } | ||
184 | return (Uint32)ret; | ||
185 | } | ||
186 | |||
187 | int SDL_SemPost(SDL_sem *sem) | ||
188 | { | ||
189 | int retval; | ||
190 | |||
191 | if ( ! sem ) { | ||
192 | SDL_SetError("Passed a NULL semaphore"); | ||
193 | return -1; | ||
194 | } | ||
195 | |||
196 | retval = sem_post(sem->sem); | ||
197 | if ( retval < 0 ) { | ||
198 | SDL_SetError("sem_post() failed"); | ||
199 | } | ||
200 | return retval; | ||
201 | } | ||
202 | |||
203 | #endif /* !SDL_THREADS_DISABLED */ | ||