Mercurial > sdl-ios-xcode
annotate src/thread/SDL_thread.c @ 1364:4214be2b8d77
Fix typo
| author | Patrice Mandin <patmandin@gmail.com> |
|---|---|
| date | Thu, 16 Feb 2006 22:00:06 +0000 |
| parents | c71e05b4dc2e |
| children | d910939febfa |
| 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 */ |
| 22 | |
| 23 /* System independent thread management routines for SDL */ | |
| 24 | |
| 25 #include "SDL_mutex.h" | |
| 26 #include "SDL_thread.h" | |
| 27 #include "SDL_thread_c.h" | |
| 28 #include "SDL_systhread.h" | |
| 29 | |
| 30 #define ARRAY_CHUNKSIZE 32 | |
| 31 /* The array of threads currently active in the application | |
| 32 (except the main thread) | |
| 33 The manipulation of an array here is safer than using a linked list. | |
| 34 */ | |
| 35 static int SDL_maxthreads = 0; | |
| 36 static int SDL_numthreads = 0; | |
| 37 static SDL_Thread **SDL_Threads = NULL; | |
| 38 static SDL_mutex *thread_lock = NULL; | |
| 39 int _creating_thread_lock = 0; | |
| 40 | |
| 41 int SDL_ThreadsInit(void) | |
| 42 { | |
| 43 int retval; | |
| 44 | |
| 45 retval = 0; | |
| 46 /* Set the thread lock creation flag so that we can reuse an | |
| 47 existing lock on the system - since this mutex never gets | |
| 48 destroyed (see SDL_ThreadsQuit()), we want to reuse it. | |
| 49 */ | |
| 50 _creating_thread_lock = 1; | |
| 51 thread_lock = SDL_CreateMutex(); | |
| 52 _creating_thread_lock = 0; | |
| 53 if ( thread_lock == NULL ) { | |
| 54 retval = -1; | |
| 55 } | |
| 56 return(retval); | |
| 57 } | |
| 58 | |
| 59 /* This should never be called... | |
| 60 If this is called by SDL_Quit(), we don't know whether or not we should | |
| 61 clean up threads here. If any threads are still running after this call, | |
| 62 they will no longer have access to any per-thread data. | |
| 63 */ | |
| 64 void SDL_ThreadsQuit() | |
| 65 { | |
| 66 SDL_mutex *mutex; | |
| 67 | |
| 68 mutex = thread_lock; | |
| 69 thread_lock = NULL; | |
| 70 if ( mutex != NULL ) { | |
| 71 SDL_DestroyMutex(mutex); | |
| 72 } | |
| 73 } | |
| 74 | |
| 75 /* Routines for manipulating the thread list */ | |
| 76 static void SDL_AddThread(SDL_Thread *thread) | |
| 77 { | |
| 78 SDL_Thread **threads; | |
| 79 | |
| 80 /* WARNING: | |
| 81 If the very first threads are created simultaneously, then | |
| 82 there could be a race condition causing memory corruption. | |
| 83 In practice, this isn't a problem because by definition there | |
| 84 is only one thread running the first time this is called. | |
| 85 */ | |
| 86 if ( thread_lock == NULL ) { | |
| 87 if ( SDL_ThreadsInit() < 0 ) { | |
| 88 return; | |
| 89 } | |
| 90 } | |
| 91 SDL_mutexP(thread_lock); | |
| 92 | |
| 93 /* Expand the list of threads, if necessary */ | |
| 94 #ifdef DEBUG_THREADS | |
| 95 printf("Adding thread (%d already - %d max)\n", | |
| 96 SDL_numthreads, SDL_maxthreads); | |
| 97 #endif | |
| 98 if ( SDL_numthreads == SDL_maxthreads ) { | |
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99 threads=(SDL_Thread **)SDL_malloc((SDL_maxthreads+ARRAY_CHUNKSIZE)* |
| 0 | 100 (sizeof *threads)); |
| 101 if ( threads == NULL ) { | |
| 102 SDL_OutOfMemory(); | |
| 103 goto done; | |
| 104 } | |
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105 SDL_memcpy(threads, SDL_Threads, SDL_numthreads*(sizeof *threads)); |
| 0 | 106 SDL_maxthreads += ARRAY_CHUNKSIZE; |
| 107 if ( SDL_Threads ) { | |
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108 SDL_free(SDL_Threads); |
| 0 | 109 } |
| 110 SDL_Threads = threads; | |
| 111 } | |
| 112 SDL_Threads[SDL_numthreads++] = thread; | |
| 113 done: | |
| 114 SDL_mutexV(thread_lock); | |
| 115 } | |
| 116 | |
| 117 static void SDL_DelThread(SDL_Thread *thread) | |
| 118 { | |
| 119 int i; | |
| 120 | |
| 121 if ( thread_lock ) { | |
| 122 SDL_mutexP(thread_lock); | |
| 123 for ( i=0; i<SDL_numthreads; ++i ) { | |
| 124 if ( thread == SDL_Threads[i] ) { | |
| 125 break; | |
| 126 } | |
| 127 } | |
| 128 if ( i < SDL_numthreads ) { | |
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129 if ( --SDL_numthreads > 0 ) { |
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130 while ( i < SDL_numthreads ) { |
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131 SDL_Threads[i] = SDL_Threads[i+1]; |
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132 ++i; |
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133 } |
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134 } else { |
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135 SDL_maxthreads = 0; |
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136 SDL_free(SDL_Threads); |
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137 SDL_Threads = NULL; |
| 0 | 138 } |
| 139 #ifdef DEBUG_THREADS | |
| 140 printf("Deleting thread (%d left - %d max)\n", | |
| 141 SDL_numthreads, SDL_maxthreads); | |
| 142 #endif | |
| 143 } | |
| 144 SDL_mutexV(thread_lock); | |
| 145 } | |
| 146 } | |
| 147 | |
| 148 /* The default (non-thread-safe) global error variable */ | |
| 149 static SDL_error SDL_global_error; | |
| 150 | |
| 151 /* Routine to get the thread-specific error variable */ | |
| 152 SDL_error *SDL_GetErrBuf(void) | |
| 153 { | |
| 154 SDL_error *errbuf; | |
| 155 | |
| 156 errbuf = &SDL_global_error; | |
| 157 if ( SDL_Threads ) { | |
| 158 int i; | |
| 159 Uint32 this_thread; | |
| 160 | |
| 161 this_thread = SDL_ThreadID(); | |
| 162 SDL_mutexP(thread_lock); | |
| 163 for ( i=0; i<SDL_numthreads; ++i ) { | |
| 164 if ( this_thread == SDL_Threads[i]->threadid ) { | |
| 165 errbuf = &SDL_Threads[i]->errbuf; | |
| 166 break; | |
| 167 } | |
| 168 } | |
| 169 SDL_mutexV(thread_lock); | |
| 170 } | |
| 171 return(errbuf); | |
| 172 } | |
| 173 | |
| 174 | |
| 175 /* Arguments and callback to setup and run the user thread function */ | |
| 176 typedef struct { | |
| 177 int (*func)(void *); | |
| 178 void *data; | |
| 179 SDL_Thread *info; | |
| 180 SDL_sem *wait; | |
| 181 } thread_args; | |
| 182 | |
| 183 void SDL_RunThread(void *data) | |
| 184 { | |
| 185 thread_args *args; | |
| 186 int (*userfunc)(void *); | |
| 187 void *userdata; | |
| 188 int *statusloc; | |
| 189 | |
| 190 /* Perform any system-dependent setup | |
| 191 - this function cannot fail, and cannot use SDL_SetError() | |
| 192 */ | |
| 193 SDL_SYS_SetupThread(); | |
| 194 | |
| 195 /* Get the thread id */ | |
| 196 args = (thread_args *)data; | |
| 197 args->info->threadid = SDL_ThreadID(); | |
| 198 | |
| 199 /* Figure out what function to run */ | |
| 200 userfunc = args->func; | |
| 201 userdata = args->data; | |
| 202 statusloc = &args->info->status; | |
| 203 | |
| 204 /* Wake up the parent thread */ | |
| 205 SDL_SemPost(args->wait); | |
| 206 | |
| 207 /* Run the function */ | |
| 208 *statusloc = userfunc(userdata); | |
| 209 } | |
| 210 | |
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211 #if defined(_WIN32) || defined(__OS2__) |
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212 #undef SDL_CreateThread |
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213 DECLSPEC SDL_Thread * SDLCALL SDL_CreateThread(int (*fn)(void *), void *data, pfnSDL_CurrentBeginThread pfnBeginThread, pfnSDL_CurrentEndThread pfnEndThread) |
| 1190 | 214 #else |
| 215 DECLSPEC SDL_Thread * SDLCALL SDL_CreateThread(int (*fn)(void *), void *data) | |
| 216 #endif | |
| 0 | 217 { |
| 218 SDL_Thread *thread; | |
| 219 thread_args *args; | |
| 220 int ret; | |
| 221 | |
| 222 /* Allocate memory for the thread info structure */ | |
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223 thread = (SDL_Thread *)SDL_malloc(sizeof(*thread)); |
| 0 | 224 if ( thread == NULL ) { |
| 225 SDL_OutOfMemory(); | |
| 226 return(NULL); | |
| 227 } | |
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228 SDL_memset(thread, 0, (sizeof *thread)); |
| 0 | 229 thread->status = -1; |
| 230 | |
| 231 /* Set up the arguments for the thread */ | |
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232 args = (thread_args *)SDL_malloc(sizeof(*args)); |
| 0 | 233 if ( args == NULL ) { |
| 234 SDL_OutOfMemory(); | |
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235 SDL_free(thread); |
| 0 | 236 return(NULL); |
| 237 } | |
| 238 args->func = fn; | |
| 239 args->data = data; | |
| 240 args->info = thread; | |
| 241 args->wait = SDL_CreateSemaphore(0); | |
| 242 if ( args->wait == NULL ) { | |
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243 SDL_free(thread); |
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244 SDL_free(args); |
| 0 | 245 return(NULL); |
| 246 } | |
| 247 | |
| 248 /* Add the thread to the list of available threads */ | |
| 249 SDL_AddThread(thread); | |
| 250 | |
| 251 /* Create the thread and go! */ | |
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252 #if defined(_WIN32) || defined(__OS2__) |
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253 ret = SDL_SYS_CreateThread(thread, args, pfnBeginThread, pfnEndThread); |
| 1190 | 254 #else |
| 0 | 255 ret = SDL_SYS_CreateThread(thread, args); |
| 1190 | 256 #endif |
| 0 | 257 if ( ret >= 0 ) { |
| 258 /* Wait for the thread function to use arguments */ | |
| 259 SDL_SemWait(args->wait); | |
| 260 } else { | |
| 261 /* Oops, failed. Gotta free everything */ | |
| 262 SDL_DelThread(thread); | |
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263 SDL_free(thread); |
| 0 | 264 thread = NULL; |
| 265 } | |
| 266 SDL_DestroySemaphore(args->wait); | |
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267 SDL_free(args); |
| 0 | 268 |
| 269 /* Everything is running now */ | |
| 270 return(thread); | |
| 271 } | |
| 272 | |
| 273 void SDL_WaitThread(SDL_Thread *thread, int *status) | |
| 274 { | |
| 275 if ( thread ) { | |
| 276 SDL_SYS_WaitThread(thread); | |
| 277 if ( status ) { | |
| 278 *status = thread->status; | |
| 279 } | |
| 280 SDL_DelThread(thread); | |
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281 SDL_free(thread); |
| 0 | 282 } |
| 283 } | |
| 284 | |
| 285 Uint32 SDL_GetThreadID(SDL_Thread *thread) | |
| 286 { | |
| 287 Uint32 id; | |
| 288 | |
| 289 if ( thread ) { | |
| 290 id = thread->threadid; | |
| 291 } else { | |
| 292 id = SDL_ThreadID(); | |
| 293 } | |
| 294 return(id); | |
| 295 } | |
| 296 | |
| 297 void SDL_KillThread(SDL_Thread *thread) | |
| 298 { | |
| 299 if ( thread ) { | |
| 300 SDL_SYS_KillThread(thread); | |
| 301 SDL_WaitThread(thread, NULL); | |
| 302 } | |
| 303 } | |
| 304 |