Mercurial > sdl-ios-xcode
annotate src/thread/linux/SDL_syscond.c @ 998:0e6627072f7a
Date: Wed, 24 Nov 2004 01:25:48 +0100
From: Stephane Marchesin
Subject: Re: [SDL] Problem compiling SDL 1.2.7
- there is a bug that was introduced in the kernel headers for 2.6.9
which is fixed in 2.6.10. This bug *will* byte when compiling the cdrom
subsystem. A patch that works around this bug is attached. Note that
users affected are not those running 2.6.9, but those using the 2.6.9
kernel headers for their system (i.e. whose libc is built against 2.6.9
headers).
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 30 Nov 2004 14:45:08 +0000 |
| parents | b8d311d90021 |
| children | c9b51268668f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
769
b8d311d90021
Updated copyright information for 2004 (Happy New Year!)
Sam Lantinga <slouken@libsdl.org>
parents:
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|
3 Copyright (C) 1997-2004 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 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 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
252
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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 SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 #ifdef linux | |
| 29 /* Look to see if glibc is available, and if so, what version */ | |
| 30 #include <features.h> | |
| 31 | |
| 32 #if (__GLIBC__ == 2) && (__GLIBC_MINOR__ == 0) | |
| 33 #warning Working around a bug in glibc 2.0 pthreads | |
| 34 #undef SDL_USE_PTHREADS | |
| 35 /* The bug is actually a problem where threads are suspended, but don't | |
| 36 wake up when the thread manager sends them a signal. This is a problem | |
| 37 with thread creation too, but it happens less often. :-/ | |
| 38 We avoid this by using System V IPC for mutexes. | |
| 39 */ | |
| 40 #endif /* glibc 2.0 */ | |
| 41 #endif /* linux */ | |
| 42 | |
| 43 #ifdef SDL_USE_PTHREADS | |
| 44 | |
| 45 #include <sys/time.h> | |
| 46 #include <unistd.h> | |
| 47 #include <errno.h> | |
| 48 #include <stdlib.h> | |
| 49 #include <pthread.h> | |
| 50 | |
| 51 #include "SDL_error.h" | |
| 52 #include "SDL_thread.h" | |
| 53 #include "SDL_sysmutex_c.h" | |
| 54 | |
| 55 | |
| 56 #if defined(PTHREAD_NO_RECURSIVE_MUTEX) && !defined(__bsdi__) | |
| 57 #error You need to use the generic condition variable implementation | |
| 58 #endif | |
| 59 | |
| 60 struct SDL_cond | |
| 61 { | |
| 62 pthread_cond_t cond; | |
| 63 }; | |
| 64 | |
| 65 /* Create a condition variable */ | |
| 66 SDL_cond * SDL_CreateCond(void) | |
| 67 { | |
| 68 SDL_cond *cond; | |
| 69 | |
| 70 cond = (SDL_cond *) malloc(sizeof(SDL_cond)); | |
| 71 if ( cond ) { | |
| 72 if ( pthread_cond_init(&cond->cond, NULL) < 0 ) { | |
| 73 SDL_SetError("pthread_cond_init() failed"); | |
| 74 free(cond); | |
| 75 cond = NULL; | |
| 76 } | |
| 77 } | |
| 78 return(cond); | |
| 79 } | |
| 80 | |
| 81 /* Destroy a condition variable */ | |
| 82 void SDL_DestroyCond(SDL_cond *cond) | |
| 83 { | |
| 84 if ( cond ) { | |
| 85 pthread_cond_destroy(&cond->cond); | |
| 86 free(cond); | |
| 87 } | |
| 88 } | |
| 89 | |
| 90 /* Restart one of the threads that are waiting on the condition variable */ | |
| 91 int SDL_CondSignal(SDL_cond *cond) | |
| 92 { | |
| 93 int retval; | |
| 94 | |
| 95 if ( ! cond ) { | |
| 96 SDL_SetError("Passed a NULL condition variable"); | |
| 97 return -1; | |
| 98 } | |
| 99 | |
| 100 retval = 0; | |
| 101 if ( pthread_cond_signal(&cond->cond) != 0 ) { | |
| 102 SDL_SetError("pthread_cond_signal() failed"); | |
| 103 retval = -1; | |
| 104 } | |
| 105 return retval; | |
| 106 } | |
| 107 | |
| 108 /* Restart all threads that are waiting on the condition variable */ | |
| 109 int SDL_CondBroadcast(SDL_cond *cond) | |
| 110 { | |
| 111 int retval; | |
| 112 | |
| 113 if ( ! cond ) { | |
| 114 SDL_SetError("Passed a NULL condition variable"); | |
| 115 return -1; | |
| 116 } | |
| 117 | |
| 118 retval = 0; | |
| 119 if ( pthread_cond_broadcast(&cond->cond) != 0 ) { | |
| 120 SDL_SetError("pthread_cond_broadcast() failed"); | |
| 121 retval = -1; | |
| 122 } | |
| 123 return retval; | |
| 124 } | |
| 125 | |
| 126 int SDL_CondWaitTimeout(SDL_cond *cond, SDL_mutex *mutex, Uint32 ms) | |
| 127 { | |
| 128 int retval; | |
| 129 struct timeval delta; | |
| 130 struct timespec abstime; | |
| 131 | |
| 132 if ( ! cond ) { | |
| 133 SDL_SetError("Passed a NULL condition variable"); | |
| 134 return -1; | |
| 135 } | |
| 136 | |
| 137 gettimeofday(&delta, NULL); | |
| 138 | |
| 139 abstime.tv_sec = delta.tv_sec + (ms/1000); | |
|
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dc660aee7d7d
Fixed timeout in Linux condition variable implementation
Sam Lantinga <slouken@libsdl.org>
parents:
0
diff
changeset
|
140 abstime.tv_nsec = (delta.tv_usec + (ms%1000) * 1000) * 1000; |
|
dc660aee7d7d
Fixed timeout in Linux condition variable implementation
Sam Lantinga <slouken@libsdl.org>
parents:
0
diff
changeset
|
141 if ( abstime.tv_nsec > 1000000000 ) { |
| 0 | 142 abstime.tv_sec += 1; |
|
244
dc660aee7d7d
Fixed timeout in Linux condition variable implementation
Sam Lantinga <slouken@libsdl.org>
parents:
0
diff
changeset
|
143 abstime.tv_nsec -= 1000000000; |
| 0 | 144 } |
| 145 | |
| 146 tryagain: | |
| 147 retval = pthread_cond_timedwait(&cond->cond, &mutex->id, &abstime); | |
| 148 switch (retval) { | |
| 149 case EINTR: | |
| 150 goto tryagain; | |
| 151 break; | |
| 152 case ETIMEDOUT: | |
| 153 retval = SDL_MUTEX_TIMEDOUT; | |
| 154 break; | |
| 155 case 0: | |
| 156 break; | |
| 157 default: | |
| 158 SDL_SetError("pthread_cond_timedwait() failed"); | |
| 159 retval = -1; | |
| 160 break; | |
| 161 } | |
| 162 return retval; | |
| 163 } | |
| 164 | |
| 165 /* Wait on the condition variable, unlocking the provided mutex. | |
| 166 The mutex must be locked before entering this function! | |
| 167 */ | |
| 168 int SDL_CondWait(SDL_cond *cond, SDL_mutex *mutex) | |
| 169 { | |
| 170 int retval; | |
| 171 | |
| 172 if ( ! cond ) { | |
| 173 SDL_SetError("Passed a NULL condition variable"); | |
| 174 return -1; | |
| 175 } | |
| 176 | |
| 177 retval = 0; | |
| 178 if ( pthread_cond_wait(&cond->cond, &mutex->id) != 0 ) { | |
| 179 SDL_SetError("pthread_cond_wait() failed"); | |
| 180 retval = -1; | |
| 181 } | |
| 182 return retval; | |
| 183 } | |
| 184 | |
| 185 #else /* Use semaphore implementation */ | |
| 186 | |
| 187 #include "generic/SDL_syscond.c" | |
| 188 | |
| 189 #endif /* SDL_USE_PTHREADS */ |