Mercurial > sdl-ios-xcode
annotate src/thread/linux/SDL_syscond.c @ 1312:c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
I batch edited these files, so please let me know if I've accidentally removed anybody's
credit here.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 01 Feb 2006 06:32:25 +0000 |
| parents | b8d311d90021 |
| children | 3692456e7b0f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
6 modify it under the terms of the GNU Lesser General Public |
| 0 | 7 License as published by the Free Software Foundation; either |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
8 version 2.1 of the License, or (at your option) any later version. |
| 0 | 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 | |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
13 Lesser General Public License for more details. |
| 0 | 14 |
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1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
15 You should have received a copy of the GNU Lesser General Public |
|
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
16 License along with this library; if not, write to the Free Software |
|
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
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Updated the source with the correct e-mail address
Sam Lantinga <slouken@libsdl.org>
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef linux | |
| 24 /* Look to see if glibc is available, and if so, what version */ | |
| 25 #include <features.h> | |
| 26 | |
| 27 #if (__GLIBC__ == 2) && (__GLIBC_MINOR__ == 0) | |
| 28 #warning Working around a bug in glibc 2.0 pthreads | |
| 29 #undef SDL_USE_PTHREADS | |
| 30 /* The bug is actually a problem where threads are suspended, but don't | |
| 31 wake up when the thread manager sends them a signal. This is a problem | |
| 32 with thread creation too, but it happens less often. :-/ | |
| 33 We avoid this by using System V IPC for mutexes. | |
| 34 */ | |
| 35 #endif /* glibc 2.0 */ | |
| 36 #endif /* linux */ | |
| 37 | |
| 38 #ifdef SDL_USE_PTHREADS | |
| 39 | |
| 40 #include <sys/time.h> | |
| 41 #include <unistd.h> | |
| 42 #include <errno.h> | |
| 43 #include <stdlib.h> | |
| 44 #include <pthread.h> | |
| 45 | |
| 46 #include "SDL_error.h" | |
| 47 #include "SDL_thread.h" | |
| 48 #include "SDL_sysmutex_c.h" | |
| 49 | |
| 50 | |
| 51 #if defined(PTHREAD_NO_RECURSIVE_MUTEX) && !defined(__bsdi__) | |
| 52 #error You need to use the generic condition variable implementation | |
| 53 #endif | |
| 54 | |
| 55 struct SDL_cond | |
| 56 { | |
| 57 pthread_cond_t cond; | |
| 58 }; | |
| 59 | |
| 60 /* Create a condition variable */ | |
| 61 SDL_cond * SDL_CreateCond(void) | |
| 62 { | |
| 63 SDL_cond *cond; | |
| 64 | |
| 65 cond = (SDL_cond *) malloc(sizeof(SDL_cond)); | |
| 66 if ( cond ) { | |
| 67 if ( pthread_cond_init(&cond->cond, NULL) < 0 ) { | |
| 68 SDL_SetError("pthread_cond_init() failed"); | |
| 69 free(cond); | |
| 70 cond = NULL; | |
| 71 } | |
| 72 } | |
| 73 return(cond); | |
| 74 } | |
| 75 | |
| 76 /* Destroy a condition variable */ | |
| 77 void SDL_DestroyCond(SDL_cond *cond) | |
| 78 { | |
| 79 if ( cond ) { | |
| 80 pthread_cond_destroy(&cond->cond); | |
| 81 free(cond); | |
| 82 } | |
| 83 } | |
| 84 | |
| 85 /* Restart one of the threads that are waiting on the condition variable */ | |
| 86 int SDL_CondSignal(SDL_cond *cond) | |
| 87 { | |
| 88 int retval; | |
| 89 | |
| 90 if ( ! cond ) { | |
| 91 SDL_SetError("Passed a NULL condition variable"); | |
| 92 return -1; | |
| 93 } | |
| 94 | |
| 95 retval = 0; | |
| 96 if ( pthread_cond_signal(&cond->cond) != 0 ) { | |
| 97 SDL_SetError("pthread_cond_signal() failed"); | |
| 98 retval = -1; | |
| 99 } | |
| 100 return retval; | |
| 101 } | |
| 102 | |
| 103 /* Restart all threads that are waiting on the condition variable */ | |
| 104 int SDL_CondBroadcast(SDL_cond *cond) | |
| 105 { | |
| 106 int retval; | |
| 107 | |
| 108 if ( ! cond ) { | |
| 109 SDL_SetError("Passed a NULL condition variable"); | |
| 110 return -1; | |
| 111 } | |
| 112 | |
| 113 retval = 0; | |
| 114 if ( pthread_cond_broadcast(&cond->cond) != 0 ) { | |
| 115 SDL_SetError("pthread_cond_broadcast() failed"); | |
| 116 retval = -1; | |
| 117 } | |
| 118 return retval; | |
| 119 } | |
| 120 | |
| 121 int SDL_CondWaitTimeout(SDL_cond *cond, SDL_mutex *mutex, Uint32 ms) | |
| 122 { | |
| 123 int retval; | |
| 124 struct timeval delta; | |
| 125 struct timespec abstime; | |
| 126 | |
| 127 if ( ! cond ) { | |
| 128 SDL_SetError("Passed a NULL condition variable"); | |
| 129 return -1; | |
| 130 } | |
| 131 | |
| 132 gettimeofday(&delta, NULL); | |
| 133 | |
| 134 abstime.tv_sec = delta.tv_sec + (ms/1000); | |
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135 abstime.tv_nsec = (delta.tv_usec + (ms%1000) * 1000) * 1000; |
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dc660aee7d7d
Fixed timeout in Linux condition variable implementation
Sam Lantinga <slouken@libsdl.org>
parents:
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diff
changeset
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136 if ( abstime.tv_nsec > 1000000000 ) { |
| 0 | 137 abstime.tv_sec += 1; |
|
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Fixed timeout in Linux condition variable implementation
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138 abstime.tv_nsec -= 1000000000; |
| 0 | 139 } |
| 140 | |
| 141 tryagain: | |
| 142 retval = pthread_cond_timedwait(&cond->cond, &mutex->id, &abstime); | |
| 143 switch (retval) { | |
| 144 case EINTR: | |
| 145 goto tryagain; | |
| 146 break; | |
| 147 case ETIMEDOUT: | |
| 148 retval = SDL_MUTEX_TIMEDOUT; | |
| 149 break; | |
| 150 case 0: | |
| 151 break; | |
| 152 default: | |
| 153 SDL_SetError("pthread_cond_timedwait() failed"); | |
| 154 retval = -1; | |
| 155 break; | |
| 156 } | |
| 157 return retval; | |
| 158 } | |
| 159 | |
| 160 /* Wait on the condition variable, unlocking the provided mutex. | |
| 161 The mutex must be locked before entering this function! | |
| 162 */ | |
| 163 int SDL_CondWait(SDL_cond *cond, SDL_mutex *mutex) | |
| 164 { | |
| 165 int retval; | |
| 166 | |
| 167 if ( ! cond ) { | |
| 168 SDL_SetError("Passed a NULL condition variable"); | |
| 169 return -1; | |
| 170 } | |
| 171 | |
| 172 retval = 0; | |
| 173 if ( pthread_cond_wait(&cond->cond, &mutex->id) != 0 ) { | |
| 174 SDL_SetError("pthread_cond_wait() failed"); | |
| 175 retval = -1; | |
| 176 } | |
| 177 return retval; | |
| 178 } | |
| 179 | |
| 180 #else /* Use semaphore implementation */ | |
| 181 | |
| 182 #include "generic/SDL_syscond.c" | |
| 183 | |
| 184 #endif /* SDL_USE_PTHREADS */ |