diff options
Diffstat (limited to 'apps/plugins/sdl/src/thread/dc/SDL_syssem.c')
-rw-r--r-- | apps/plugins/sdl/src/thread/dc/SDL_syssem.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/apps/plugins/sdl/src/thread/dc/SDL_syssem.c b/apps/plugins/sdl/src/thread/dc/SDL_syssem.c new file mode 100644 index 0000000000..9831ccdbd7 --- /dev/null +++ b/apps/plugins/sdl/src/thread/dc/SDL_syssem.c | |||
@@ -0,0 +1,173 @@ | |||
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 | /* An implementation of semaphores using mutexes and condition variables */ | ||
28 | |||
29 | #include "SDL_timer.h" | ||
30 | #include "SDL_thread.h" | ||
31 | #include "SDL_systhread_c.h" | ||
32 | |||
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 | #include <kos/sem.h> | ||
79 | |||
80 | struct SDL_semaphore | ||
81 | { | ||
82 | semaphore_t sem; | ||
83 | }; | ||
84 | |||
85 | SDL_sem *SDL_CreateSemaphore(Uint32 initial_value) | ||
86 | { | ||
87 | return (SDL_sem *)sem_create(initial_value); | ||
88 | } | ||
89 | |||
90 | /* WARNING: | ||
91 | You cannot call this function when another thread is using the semaphore. | ||
92 | */ | ||
93 | void SDL_DestroySemaphore(SDL_sem *sem) | ||
94 | { | ||
95 | if ( ! sem ) { | ||
96 | SDL_SetError("Passed a NULL semaphore"); | ||
97 | return; | ||
98 | } | ||
99 | |||
100 | sem_destroy(&sem->sem); | ||
101 | } | ||
102 | |||
103 | int SDL_SemTryWait(SDL_sem *sem) | ||
104 | { | ||
105 | int retval; | ||
106 | |||
107 | if ( ! sem ) { | ||
108 | SDL_SetError("Passed a NULL semaphore"); | ||
109 | return -1; | ||
110 | } | ||
111 | |||
112 | retval = sem_trywait(&sem->sem); | ||
113 | if (retval==0) return 0; | ||
114 | else return SDL_MUTEX_TIMEDOUT; | ||
115 | |||
116 | return retval; | ||
117 | } | ||
118 | |||
119 | int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) | ||
120 | { | ||
121 | int retval; | ||
122 | |||
123 | if ( ! sem ) { | ||
124 | SDL_SetError("Passed a NULL semaphore"); | ||
125 | return -1; | ||
126 | } | ||
127 | |||
128 | /* A timeout of 0 is an easy case */ | ||
129 | if ( timeout == 0 ) { | ||
130 | return SDL_SemTryWait(sem); | ||
131 | } | ||
132 | |||
133 | retval = sem_wait_timed(&sem->sem,timeout); | ||
134 | if (retval==-1) retval= SDL_MUTEX_TIMEDOUT; | ||
135 | |||
136 | return retval; | ||
137 | } | ||
138 | |||
139 | int SDL_SemWait(SDL_sem *sem) | ||
140 | { | ||
141 | int retval; | ||
142 | |||
143 | if ( ! sem ) { | ||
144 | SDL_SetError("Passed a NULL semaphore"); | ||
145 | return -1; | ||
146 | } | ||
147 | |||
148 | while ( ((retval = sem_wait(&sem->sem)) == -1) && (errno == EINTR) ) {} | ||
149 | return retval; | ||
150 | } | ||
151 | |||
152 | Uint32 SDL_SemValue(SDL_sem *sem) | ||
153 | { | ||
154 | if ( ! sem ) { | ||
155 | SDL_SetError("Passed a NULL semaphore"); | ||
156 | return -1; | ||
157 | } | ||
158 | |||
159 | return sem_count(&sem->sem); | ||
160 | } | ||
161 | |||
162 | int SDL_SemPost(SDL_sem *sem) | ||
163 | { | ||
164 | if ( ! sem ) { | ||
165 | SDL_SetError("Passed a NULL semaphore"); | ||
166 | return -1; | ||
167 | } | ||
168 | |||
169 | sem_signal(&sem->sem); | ||
170 | return 0; | ||
171 | } | ||
172 | |||
173 | #endif /* SDL_THREADS_DISABLED */ | ||