Mercurial > sdl-ios-xcode
annotate src/thread/SDL_thread.c @ 3966:c0de2aac0a8c SDL-1.2
Added patch note for subversion revision 3076
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 15 Jun 2007 11:43:14 +0000 |
| parents | 290b5baf2fca |
| children | 782fd950bd46 c121d94672cb a1b03ba2fcd0 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
|
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6 modify it under the terms of the GNU Lesser General Public |
| 0 | 7 License as published by the Free Software Foundation; either |
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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 | |
|
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13 Lesser General Public License for more details. |
| 0 | 14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
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22 #include "SDL_config.h" |
| 0 | 23 |
| 24 /* System independent thread management routines for SDL */ | |
| 25 | |
| 26 #include "SDL_mutex.h" | |
| 27 #include "SDL_thread.h" | |
| 28 #include "SDL_thread_c.h" | |
| 29 #include "SDL_systhread.h" | |
| 30 | |
| 31 #define ARRAY_CHUNKSIZE 32 | |
| 32 /* The array of threads currently active in the application | |
| 33 (except the main thread) | |
| 34 The manipulation of an array here is safer than using a linked list. | |
| 35 */ | |
| 36 static int SDL_maxthreads = 0; | |
| 37 static int SDL_numthreads = 0; | |
| 38 static SDL_Thread **SDL_Threads = NULL; | |
| 39 static SDL_mutex *thread_lock = NULL; | |
| 40 | |
| 41 int SDL_ThreadsInit(void) | |
| 42 { | |
| 43 int retval; | |
| 44 | |
| 45 retval = 0; | |
| 46 thread_lock = SDL_CreateMutex(); | |
| 47 if ( thread_lock == NULL ) { | |
| 48 retval = -1; | |
| 49 } | |
| 50 return(retval); | |
| 51 } | |
| 52 | |
| 53 /* This should never be called... | |
| 54 If this is called by SDL_Quit(), we don't know whether or not we should | |
| 55 clean up threads here. If any threads are still running after this call, | |
| 56 they will no longer have access to any per-thread data. | |
| 57 */ | |
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58 void SDL_ThreadsQuit(void) |
| 0 | 59 { |
| 60 SDL_mutex *mutex; | |
| 61 | |
| 62 mutex = thread_lock; | |
| 63 thread_lock = NULL; | |
| 64 if ( mutex != NULL ) { | |
| 65 SDL_DestroyMutex(mutex); | |
| 66 } | |
| 67 } | |
| 68 | |
| 69 /* Routines for manipulating the thread list */ | |
| 70 static void SDL_AddThread(SDL_Thread *thread) | |
| 71 { | |
| 72 /* WARNING: | |
| 73 If the very first threads are created simultaneously, then | |
| 74 there could be a race condition causing memory corruption. | |
| 75 In practice, this isn't a problem because by definition there | |
| 76 is only one thread running the first time this is called. | |
| 77 */ | |
| 1499 | 78 if ( !thread_lock ) { |
| 0 | 79 if ( SDL_ThreadsInit() < 0 ) { |
| 80 return; | |
| 81 } | |
| 82 } | |
| 83 SDL_mutexP(thread_lock); | |
| 84 | |
| 85 /* Expand the list of threads, if necessary */ | |
| 86 #ifdef DEBUG_THREADS | |
| 87 printf("Adding thread (%d already - %d max)\n", | |
| 88 SDL_numthreads, SDL_maxthreads); | |
| 89 #endif | |
| 90 if ( SDL_numthreads == SDL_maxthreads ) { | |
| 1499 | 91 SDL_Thread **threads; |
| 92 threads = (SDL_Thread **)SDL_realloc(SDL_Threads, | |
| 93 (SDL_maxthreads+ARRAY_CHUNKSIZE)*(sizeof *threads)); | |
| 0 | 94 if ( threads == NULL ) { |
| 95 SDL_OutOfMemory(); | |
| 96 goto done; | |
| 97 } | |
| 98 SDL_maxthreads += ARRAY_CHUNKSIZE; | |
| 99 SDL_Threads = threads; | |
| 100 } | |
| 101 SDL_Threads[SDL_numthreads++] = thread; | |
| 102 done: | |
| 103 SDL_mutexV(thread_lock); | |
| 104 } | |
| 105 | |
| 106 static void SDL_DelThread(SDL_Thread *thread) | |
| 107 { | |
| 108 int i; | |
| 109 | |
| 1499 | 110 if ( !thread_lock ) { |
| 111 return; | |
| 112 } | |
| 113 SDL_mutexP(thread_lock); | |
| 114 for ( i=0; i<SDL_numthreads; ++i ) { | |
| 115 if ( thread == SDL_Threads[i] ) { | |
| 116 break; | |
| 0 | 117 } |
| 1499 | 118 } |
| 119 if ( i < SDL_numthreads ) { | |
| 120 if ( --SDL_numthreads > 0 ) { | |
| 121 while ( i < SDL_numthreads ) { | |
| 122 SDL_Threads[i] = SDL_Threads[i+1]; | |
| 123 ++i; | |
| 0 | 124 } |
| 1499 | 125 } else { |
| 126 SDL_maxthreads = 0; | |
| 127 SDL_free(SDL_Threads); | |
| 128 SDL_Threads = NULL; | |
| 129 } | |
| 0 | 130 #ifdef DEBUG_THREADS |
| 1499 | 131 printf("Deleting thread (%d left - %d max)\n", |
| 132 SDL_numthreads, SDL_maxthreads); | |
| 0 | 133 #endif |
| 1499 | 134 } |
| 135 SDL_mutexV(thread_lock); | |
| 136 | |
| 137 if ( SDL_Threads == NULL ) { | |
| 138 SDL_ThreadsQuit(); | |
| 0 | 139 } |
| 140 } | |
| 141 | |
| 142 /* The default (non-thread-safe) global error variable */ | |
| 143 static SDL_error SDL_global_error; | |
| 144 | |
| 145 /* Routine to get the thread-specific error variable */ | |
| 146 SDL_error *SDL_GetErrBuf(void) | |
| 147 { | |
| 148 SDL_error *errbuf; | |
| 149 | |
| 150 errbuf = &SDL_global_error; | |
| 151 if ( SDL_Threads ) { | |
| 152 int i; | |
| 153 Uint32 this_thread; | |
| 154 | |
| 155 this_thread = SDL_ThreadID(); | |
| 156 SDL_mutexP(thread_lock); | |
| 157 for ( i=0; i<SDL_numthreads; ++i ) { | |
| 158 if ( this_thread == SDL_Threads[i]->threadid ) { | |
| 159 errbuf = &SDL_Threads[i]->errbuf; | |
| 160 break; | |
| 161 } | |
| 162 } | |
| 163 SDL_mutexV(thread_lock); | |
| 164 } | |
| 165 return(errbuf); | |
| 166 } | |
| 167 | |
| 168 | |
| 169 /* Arguments and callback to setup and run the user thread function */ | |
| 170 typedef struct { | |
| 1769 | 171 int (SDLCALL *func)(void *); |
| 0 | 172 void *data; |
| 173 SDL_Thread *info; | |
| 174 SDL_sem *wait; | |
| 175 } thread_args; | |
| 176 | |
| 177 void SDL_RunThread(void *data) | |
| 178 { | |
| 179 thread_args *args; | |
| 1769 | 180 int (SDLCALL *userfunc)(void *); |
| 0 | 181 void *userdata; |
| 182 int *statusloc; | |
| 183 | |
| 184 /* Perform any system-dependent setup | |
| 185 - this function cannot fail, and cannot use SDL_SetError() | |
| 186 */ | |
| 187 SDL_SYS_SetupThread(); | |
| 188 | |
| 189 /* Get the thread id */ | |
| 190 args = (thread_args *)data; | |
| 191 args->info->threadid = SDL_ThreadID(); | |
| 192 | |
| 193 /* Figure out what function to run */ | |
| 194 userfunc = args->func; | |
| 195 userdata = args->data; | |
| 196 statusloc = &args->info->status; | |
| 197 | |
| 198 /* Wake up the parent thread */ | |
| 199 SDL_SemPost(args->wait); | |
| 200 | |
| 201 /* Run the function */ | |
| 202 *statusloc = userfunc(userdata); | |
| 203 } | |
| 204 | |
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205 #ifdef SDL_PASSED_BEGINTHREAD_ENDTHREAD |
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206 #undef SDL_CreateThread |
| 1769 | 207 DECLSPEC SDL_Thread * SDLCALL SDL_CreateThread(int (SDLCALL *fn)(void *), void *data, pfnSDL_CurrentBeginThread pfnBeginThread, pfnSDL_CurrentEndThread pfnEndThread) |
| 1190 | 208 #else |
| 1769 | 209 DECLSPEC SDL_Thread * SDLCALL SDL_CreateThread(int (SDLCALL *fn)(void *), void *data) |
| 1190 | 210 #endif |
| 0 | 211 { |
| 212 SDL_Thread *thread; | |
| 213 thread_args *args; | |
| 214 int ret; | |
| 215 | |
| 216 /* Allocate memory for the thread info structure */ | |
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217 thread = (SDL_Thread *)SDL_malloc(sizeof(*thread)); |
| 0 | 218 if ( thread == NULL ) { |
| 219 SDL_OutOfMemory(); | |
| 220 return(NULL); | |
| 221 } | |
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222 SDL_memset(thread, 0, (sizeof *thread)); |
| 0 | 223 thread->status = -1; |
| 224 | |
| 225 /* Set up the arguments for the thread */ | |
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226 args = (thread_args *)SDL_malloc(sizeof(*args)); |
| 0 | 227 if ( args == NULL ) { |
| 228 SDL_OutOfMemory(); | |
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229 SDL_free(thread); |
| 0 | 230 return(NULL); |
| 231 } | |
| 232 args->func = fn; | |
| 233 args->data = data; | |
| 234 args->info = thread; | |
| 235 args->wait = SDL_CreateSemaphore(0); | |
| 236 if ( args->wait == NULL ) { | |
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237 SDL_free(thread); |
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238 SDL_free(args); |
| 0 | 239 return(NULL); |
| 240 } | |
| 241 | |
| 242 /* Add the thread to the list of available threads */ | |
| 243 SDL_AddThread(thread); | |
| 244 | |
| 245 /* Create the thread and go! */ | |
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246 #ifdef SDL_PASSED_BEGINTHREAD_ENDTHREAD |
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247 ret = SDL_SYS_CreateThread(thread, args, pfnBeginThread, pfnEndThread); |
| 1190 | 248 #else |
| 0 | 249 ret = SDL_SYS_CreateThread(thread, args); |
| 1190 | 250 #endif |
| 0 | 251 if ( ret >= 0 ) { |
| 252 /* Wait for the thread function to use arguments */ | |
| 253 SDL_SemWait(args->wait); | |
| 254 } else { | |
| 255 /* Oops, failed. Gotta free everything */ | |
| 256 SDL_DelThread(thread); | |
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257 SDL_free(thread); |
| 0 | 258 thread = NULL; |
| 259 } | |
| 260 SDL_DestroySemaphore(args->wait); | |
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261 SDL_free(args); |
| 0 | 262 |
| 263 /* Everything is running now */ | |
| 264 return(thread); | |
| 265 } | |
| 266 | |
| 267 void SDL_WaitThread(SDL_Thread *thread, int *status) | |
| 268 { | |
| 269 if ( thread ) { | |
| 270 SDL_SYS_WaitThread(thread); | |
| 271 if ( status ) { | |
| 272 *status = thread->status; | |
| 273 } | |
| 274 SDL_DelThread(thread); | |
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275 SDL_free(thread); |
| 0 | 276 } |
| 277 } | |
| 278 | |
| 279 Uint32 SDL_GetThreadID(SDL_Thread *thread) | |
| 280 { | |
| 281 Uint32 id; | |
| 282 | |
| 283 if ( thread ) { | |
| 284 id = thread->threadid; | |
| 285 } else { | |
| 286 id = SDL_ThreadID(); | |
| 287 } | |
| 288 return(id); | |
| 289 } | |
| 290 | |
| 291 void SDL_KillThread(SDL_Thread *thread) | |
| 292 { | |
| 293 if ( thread ) { | |
| 294 SDL_SYS_KillThread(thread); | |
| 295 SDL_WaitThread(thread, NULL); | |
| 296 } | |
| 297 } | |
| 298 |