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author | Franklin Wei <git@fwei.tk> | 2017-01-21 15:18:31 -0500 |
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committer | Franklin Wei <git@fwei.tk> | 2017-12-23 21:01:26 -0500 |
commit | a855d6202536ff28e5aae4f22a0f31d8f5b325d0 (patch) | |
tree | 8c75f224dd64ed360505afa8843d016b0d75000b /apps/plugins/sdl/src/thread/pthread/SDL_syssem.c | |
parent | 01c6dcf6c7b9bb1ad2fa0450f99bacc5f3d3e04b (diff) | |
download | rockbox-a855d6202536ff28e5aae4f22a0f31d8f5b325d0.tar.gz rockbox-a855d6202536ff28e5aae4f22a0f31d8f5b325d0.zip |
Port of Duke Nukem 3D
This ports Fabien Sanglard's Chocolate Duke to run on a version of SDL
for Rockbox.
Change-Id: I8f2c4c78af19de10c1633ed7bb7a997b43256dd9
Diffstat (limited to 'apps/plugins/sdl/src/thread/pthread/SDL_syssem.c')
-rw-r--r-- | apps/plugins/sdl/src/thread/pthread/SDL_syssem.c | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/apps/plugins/sdl/src/thread/pthread/SDL_syssem.c b/apps/plugins/sdl/src/thread/pthread/SDL_syssem.c new file mode 100644 index 0000000000..a03870fa35 --- /dev/null +++ b/apps/plugins/sdl/src/thread/pthread/SDL_syssem.c | |||
@@ -0,0 +1,190 @@ | |||
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 | #include <pthread.h> | ||
25 | #include <semaphore.h> | ||
26 | #include <errno.h> | ||
27 | #include <sys/time.h> | ||
28 | |||
29 | #include "SDL_thread.h" | ||
30 | #include "SDL_timer.h" | ||
31 | |||
32 | /* Wrapper around POSIX 1003.1b semaphores */ | ||
33 | |||
34 | #ifdef __MACOSX__ | ||
35 | /* Mac OS X doesn't support sem_getvalue() as of version 10.4 */ | ||
36 | #include "../generic/SDL_syssem.c" | ||
37 | #else | ||
38 | |||
39 | struct SDL_semaphore { | ||
40 | sem_t sem; | ||
41 | }; | ||
42 | |||
43 | /* Create a semaphore, initialized with value */ | ||
44 | SDL_sem *SDL_CreateSemaphore(Uint32 initial_value) | ||
45 | { | ||
46 | SDL_sem *sem = (SDL_sem *) SDL_malloc(sizeof(SDL_sem)); | ||
47 | if ( sem ) { | ||
48 | if ( sem_init(&sem->sem, 0, initial_value) < 0 ) { | ||
49 | SDL_SetError("sem_init() failed"); | ||
50 | SDL_free(sem); | ||
51 | sem = NULL; | ||
52 | } | ||
53 | } else { | ||
54 | SDL_OutOfMemory(); | ||
55 | } | ||
56 | return sem; | ||
57 | } | ||
58 | |||
59 | void SDL_DestroySemaphore(SDL_sem *sem) | ||
60 | { | ||
61 | if ( sem ) { | ||
62 | sem_destroy(&sem->sem); | ||
63 | SDL_free(sem); | ||
64 | } | ||
65 | } | ||
66 | |||
67 | int SDL_SemTryWait(SDL_sem *sem) | ||
68 | { | ||
69 | int retval; | ||
70 | |||
71 | if ( ! sem ) { | ||
72 | SDL_SetError("Passed a NULL semaphore"); | ||
73 | return -1; | ||
74 | } | ||
75 | retval = SDL_MUTEX_TIMEDOUT; | ||
76 | if ( sem_trywait(&sem->sem) == 0 ) { | ||
77 | retval = 0; | ||
78 | } | ||
79 | return retval; | ||
80 | } | ||
81 | |||
82 | int SDL_SemWait(SDL_sem *sem) | ||
83 | { | ||
84 | int retval; | ||
85 | |||
86 | if ( ! sem ) { | ||
87 | SDL_SetError("Passed a NULL semaphore"); | ||
88 | return -1; | ||
89 | } | ||
90 | |||
91 | while ( ((retval = sem_wait(&sem->sem)) == -1) && (errno == EINTR) ) {} | ||
92 | if ( retval < 0 ) { | ||
93 | SDL_SetError("sem_wait() failed"); | ||
94 | } | ||
95 | return retval; | ||
96 | } | ||
97 | |||
98 | int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) | ||
99 | { | ||
100 | int retval; | ||
101 | #ifdef HAVE_SEM_TIMEDWAIT | ||
102 | struct timeval now; | ||
103 | struct timespec ts_timeout; | ||
104 | #else | ||
105 | Uint32 end; | ||
106 | #endif | ||
107 | |||
108 | if ( ! sem ) { | ||
109 | SDL_SetError("Passed a NULL semaphore"); | ||
110 | return -1; | ||
111 | } | ||
112 | |||
113 | /* Try the easy cases first */ | ||
114 | if ( timeout == 0 ) { | ||
115 | return SDL_SemTryWait(sem); | ||
116 | } | ||
117 | if ( timeout == SDL_MUTEX_MAXWAIT ) { | ||
118 | return SDL_SemWait(sem); | ||
119 | } | ||
120 | |||
121 | #ifdef HAVE_SEM_TIMEDWAIT | ||
122 | /* Setup the timeout. sem_timedwait doesn't wait for | ||
123 | * a lapse of time, but until we reach a certain time. | ||
124 | * This time is now plus the timeout. | ||
125 | */ | ||
126 | gettimeofday(&now, NULL); | ||
127 | |||
128 | /* Add our timeout to current time */ | ||
129 | now.tv_usec += (timeout % 1000) * 1000; | ||
130 | now.tv_sec += timeout / 1000; | ||
131 | |||
132 | /* Wrap the second if needed */ | ||
133 | if ( now.tv_usec >= 1000000 ) { | ||
134 | now.tv_usec -= 1000000; | ||
135 | now.tv_sec ++; | ||
136 | } | ||
137 | |||
138 | /* Convert to timespec */ | ||
139 | ts_timeout.tv_sec = now.tv_sec; | ||
140 | ts_timeout.tv_nsec = now.tv_usec * 1000; | ||
141 | |||
142 | /* Wait. */ | ||
143 | do | ||
144 | retval = sem_timedwait(&sem->sem, &ts_timeout); | ||
145 | while (retval == -1 && errno == EINTR); | ||
146 | |||
147 | if (retval == -1) | ||
148 | SDL_SetError(strerror(errno)); | ||
149 | #else | ||
150 | end = SDL_GetTicks() + timeout; | ||
151 | while ((retval = SDL_SemTryWait(sem)) == SDL_MUTEX_TIMEDOUT) { | ||
152 | if ((SDL_GetTicks() - end) >= 0) { | ||
153 | break; | ||
154 | } | ||
155 | SDL_Delay(0); | ||
156 | } | ||
157 | #endif /* HAVE_SEM_TIMEDWAIT */ | ||
158 | |||
159 | return retval; | ||
160 | } | ||
161 | |||
162 | Uint32 SDL_SemValue(SDL_sem *sem) | ||
163 | { | ||
164 | int ret = 0; | ||
165 | if ( sem ) { | ||
166 | sem_getvalue(&sem->sem, &ret); | ||
167 | if ( ret < 0 ) { | ||
168 | ret = 0; | ||
169 | } | ||
170 | } | ||
171 | return (Uint32)ret; | ||
172 | } | ||
173 | |||
174 | int SDL_SemPost(SDL_sem *sem) | ||
175 | { | ||
176 | int retval; | ||
177 | |||
178 | if ( ! sem ) { | ||
179 | SDL_SetError("Passed a NULL semaphore"); | ||
180 | return -1; | ||
181 | } | ||
182 | |||
183 | retval = sem_post(&sem->sem); | ||
184 | if ( retval < 0 ) { | ||
185 | SDL_SetError("sem_post() failed"); | ||
186 | } | ||
187 | return retval; | ||
188 | } | ||
189 | |||
190 | #endif /* __MACOSX__ */ | ||