Mercurial > sdl-ios-xcode
annotate src/thread/SDL_thread.c @ 1431:8a1c27aacfe3
Updated CodeWarrior projects (at least MacOS ones)
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sat, 25 Feb 2006 20:47:42 +0000 |
| parents | d910939febfa |
| children | 9fb0eee04dd9 |
| 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 int _creating_thread_lock = 0; | |
| 41 | |
| 42 int SDL_ThreadsInit(void) | |
| 43 { | |
| 44 int retval; | |
| 45 | |
| 46 retval = 0; | |
| 47 /* Set the thread lock creation flag so that we can reuse an | |
| 48 existing lock on the system - since this mutex never gets | |
| 49 destroyed (see SDL_ThreadsQuit()), we want to reuse it. | |
| 50 */ | |
| 51 _creating_thread_lock = 1; | |
| 52 thread_lock = SDL_CreateMutex(); | |
| 53 _creating_thread_lock = 0; | |
| 54 if ( thread_lock == NULL ) { | |
| 55 retval = -1; | |
| 56 } | |
| 57 return(retval); | |
| 58 } | |
| 59 | |
| 60 /* This should never be called... | |
| 61 If this is called by SDL_Quit(), we don't know whether or not we should | |
| 62 clean up threads here. If any threads are still running after this call, | |
| 63 they will no longer have access to any per-thread data. | |
| 64 */ | |
| 65 void SDL_ThreadsQuit() | |
| 66 { | |
| 67 SDL_mutex *mutex; | |
| 68 | |
| 69 mutex = thread_lock; | |
| 70 thread_lock = NULL; | |
| 71 if ( mutex != NULL ) { | |
| 72 SDL_DestroyMutex(mutex); | |
| 73 } | |
| 74 } | |
| 75 | |
| 76 /* Routines for manipulating the thread list */ | |
| 77 static void SDL_AddThread(SDL_Thread *thread) | |
| 78 { | |
| 79 SDL_Thread **threads; | |
| 80 | |
| 81 /* WARNING: | |
| 82 If the very first threads are created simultaneously, then | |
| 83 there could be a race condition causing memory corruption. | |
| 84 In practice, this isn't a problem because by definition there | |
| 85 is only one thread running the first time this is called. | |
| 86 */ | |
| 87 if ( thread_lock == NULL ) { | |
| 88 if ( SDL_ThreadsInit() < 0 ) { | |
| 89 return; | |
| 90 } | |
| 91 } | |
| 92 SDL_mutexP(thread_lock); | |
| 93 | |
| 94 /* Expand the list of threads, if necessary */ | |
| 95 #ifdef DEBUG_THREADS | |
| 96 printf("Adding thread (%d already - %d max)\n", | |
| 97 SDL_numthreads, SDL_maxthreads); | |
| 98 #endif | |
| 99 if ( SDL_numthreads == SDL_maxthreads ) { | |
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100 threads=(SDL_Thread **)SDL_malloc((SDL_maxthreads+ARRAY_CHUNKSIZE)* |
| 0 | 101 (sizeof *threads)); |
| 102 if ( threads == NULL ) { | |
| 103 SDL_OutOfMemory(); | |
| 104 goto done; | |
| 105 } | |
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106 SDL_memcpy(threads, SDL_Threads, SDL_numthreads*(sizeof *threads)); |
| 0 | 107 SDL_maxthreads += ARRAY_CHUNKSIZE; |
| 108 if ( SDL_Threads ) { | |
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109 SDL_free(SDL_Threads); |
| 0 | 110 } |
| 111 SDL_Threads = threads; | |
| 112 } | |
| 113 SDL_Threads[SDL_numthreads++] = thread; | |
| 114 done: | |
| 115 SDL_mutexV(thread_lock); | |
| 116 } | |
| 117 | |
| 118 static void SDL_DelThread(SDL_Thread *thread) | |
| 119 { | |
| 120 int i; | |
| 121 | |
| 122 if ( thread_lock ) { | |
| 123 SDL_mutexP(thread_lock); | |
| 124 for ( i=0; i<SDL_numthreads; ++i ) { | |
| 125 if ( thread == SDL_Threads[i] ) { | |
| 126 break; | |
| 127 } | |
| 128 } | |
| 129 if ( i < SDL_numthreads ) { | |
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130 if ( --SDL_numthreads > 0 ) { |
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131 while ( i < SDL_numthreads ) { |
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132 SDL_Threads[i] = SDL_Threads[i+1]; |
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133 ++i; |
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134 } |
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135 } else { |
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136 SDL_maxthreads = 0; |
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137 SDL_free(SDL_Threads); |
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138 SDL_Threads = NULL; |
| 0 | 139 } |
| 140 #ifdef DEBUG_THREADS | |
| 141 printf("Deleting thread (%d left - %d max)\n", | |
| 142 SDL_numthreads, SDL_maxthreads); | |
| 143 #endif | |
| 144 } | |
| 145 SDL_mutexV(thread_lock); | |
| 146 } | |
| 147 } | |
| 148 | |
| 149 /* The default (non-thread-safe) global error variable */ | |
| 150 static SDL_error SDL_global_error; | |
| 151 | |
| 152 /* Routine to get the thread-specific error variable */ | |
| 153 SDL_error *SDL_GetErrBuf(void) | |
| 154 { | |
| 155 SDL_error *errbuf; | |
| 156 | |
| 157 errbuf = &SDL_global_error; | |
| 158 if ( SDL_Threads ) { | |
| 159 int i; | |
| 160 Uint32 this_thread; | |
| 161 | |
| 162 this_thread = SDL_ThreadID(); | |
| 163 SDL_mutexP(thread_lock); | |
| 164 for ( i=0; i<SDL_numthreads; ++i ) { | |
| 165 if ( this_thread == SDL_Threads[i]->threadid ) { | |
| 166 errbuf = &SDL_Threads[i]->errbuf; | |
| 167 break; | |
| 168 } | |
| 169 } | |
| 170 SDL_mutexV(thread_lock); | |
| 171 } | |
| 172 return(errbuf); | |
| 173 } | |
| 174 | |
| 175 | |
| 176 /* Arguments and callback to setup and run the user thread function */ | |
| 177 typedef struct { | |
| 178 int (*func)(void *); | |
| 179 void *data; | |
| 180 SDL_Thread *info; | |
| 181 SDL_sem *wait; | |
| 182 } thread_args; | |
| 183 | |
| 184 void SDL_RunThread(void *data) | |
| 185 { | |
| 186 thread_args *args; | |
| 187 int (*userfunc)(void *); | |
| 188 void *userdata; | |
| 189 int *statusloc; | |
| 190 | |
| 191 /* Perform any system-dependent setup | |
| 192 - this function cannot fail, and cannot use SDL_SetError() | |
| 193 */ | |
| 194 SDL_SYS_SetupThread(); | |
| 195 | |
| 196 /* Get the thread id */ | |
| 197 args = (thread_args *)data; | |
| 198 args->info->threadid = SDL_ThreadID(); | |
| 199 | |
| 200 /* Figure out what function to run */ | |
| 201 userfunc = args->func; | |
| 202 userdata = args->data; | |
| 203 statusloc = &args->info->status; | |
| 204 | |
| 205 /* Wake up the parent thread */ | |
| 206 SDL_SemPost(args->wait); | |
| 207 | |
| 208 /* Run the function */ | |
| 209 *statusloc = userfunc(userdata); | |
| 210 } | |
| 211 | |
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212 #if defined(__WIN32__) || defined(__OS2__) |
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213 #undef SDL_CreateThread |
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214 DECLSPEC SDL_Thread * SDLCALL SDL_CreateThread(int (*fn)(void *), void *data, pfnSDL_CurrentBeginThread pfnBeginThread, pfnSDL_CurrentEndThread pfnEndThread) |
| 1190 | 215 #else |
| 216 DECLSPEC SDL_Thread * SDLCALL SDL_CreateThread(int (*fn)(void *), void *data) | |
| 217 #endif | |
| 0 | 218 { |
| 219 SDL_Thread *thread; | |
| 220 thread_args *args; | |
| 221 int ret; | |
| 222 | |
| 223 /* Allocate memory for the thread info structure */ | |
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224 thread = (SDL_Thread *)SDL_malloc(sizeof(*thread)); |
| 0 | 225 if ( thread == NULL ) { |
| 226 SDL_OutOfMemory(); | |
| 227 return(NULL); | |
| 228 } | |
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229 SDL_memset(thread, 0, (sizeof *thread)); |
| 0 | 230 thread->status = -1; |
| 231 | |
| 232 /* Set up the arguments for the thread */ | |
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233 args = (thread_args *)SDL_malloc(sizeof(*args)); |
| 0 | 234 if ( args == NULL ) { |
| 235 SDL_OutOfMemory(); | |
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236 SDL_free(thread); |
| 0 | 237 return(NULL); |
| 238 } | |
| 239 args->func = fn; | |
| 240 args->data = data; | |
| 241 args->info = thread; | |
| 242 args->wait = SDL_CreateSemaphore(0); | |
| 243 if ( args->wait == NULL ) { | |
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244 SDL_free(thread); |
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245 SDL_free(args); |
| 0 | 246 return(NULL); |
| 247 } | |
| 248 | |
| 249 /* Add the thread to the list of available threads */ | |
| 250 SDL_AddThread(thread); | |
| 251 | |
| 252 /* Create the thread and go! */ | |
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253 #if defined(__WIN32__) || defined(__OS2__) |
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254 ret = SDL_SYS_CreateThread(thread, args, pfnBeginThread, pfnEndThread); |
| 1190 | 255 #else |
| 0 | 256 ret = SDL_SYS_CreateThread(thread, args); |
| 1190 | 257 #endif |
| 0 | 258 if ( ret >= 0 ) { |
| 259 /* Wait for the thread function to use arguments */ | |
| 260 SDL_SemWait(args->wait); | |
| 261 } else { | |
| 262 /* Oops, failed. Gotta free everything */ | |
| 263 SDL_DelThread(thread); | |
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264 SDL_free(thread); |
| 0 | 265 thread = NULL; |
| 266 } | |
| 267 SDL_DestroySemaphore(args->wait); | |
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268 SDL_free(args); |
| 0 | 269 |
| 270 /* Everything is running now */ | |
| 271 return(thread); | |
| 272 } | |
| 273 | |
| 274 void SDL_WaitThread(SDL_Thread *thread, int *status) | |
| 275 { | |
| 276 if ( thread ) { | |
| 277 SDL_SYS_WaitThread(thread); | |
| 278 if ( status ) { | |
| 279 *status = thread->status; | |
| 280 } | |
| 281 SDL_DelThread(thread); | |
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282 SDL_free(thread); |
| 0 | 283 } |
| 284 } | |
| 285 | |
| 286 Uint32 SDL_GetThreadID(SDL_Thread *thread) | |
| 287 { | |
| 288 Uint32 id; | |
| 289 | |
| 290 if ( thread ) { | |
| 291 id = thread->threadid; | |
| 292 } else { | |
| 293 id = SDL_ThreadID(); | |
| 294 } | |
| 295 return(id); | |
| 296 } | |
| 297 | |
| 298 void SDL_KillThread(SDL_Thread *thread) | |
| 299 { | |
| 300 if ( thread ) { | |
| 301 SDL_SYS_KillThread(thread); | |
| 302 SDL_WaitThread(thread, NULL); | |
| 303 } | |
| 304 } | |
| 305 |