Mercurial > sdl-ios-xcode
annotate src/thread/SDL_thread.c @ 1336:3692456e7b0f
Use SDL_ prefixed versions of C library functions.
FIXME:
Change #include <stdlib.h> to #include "SDL_stdlib.h"
Change #include <string.h> to #include "SDL_string.h"
Make sure nothing else broke because of this...
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 07 Feb 2006 06:59:48 +0000 |
| parents | 450721ad5436 |
| children | 604d73db6802 |
| 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_error.h" | |
| 26 #include "SDL_mutex.h" | |
| 27 #include "SDL_thread.h" | |
|
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28 #include "SDL_stdlib.h" |
|
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29 #include "SDL_string.h" |
| 0 | 30 #include "SDL_thread_c.h" |
| 31 #include "SDL_systhread.h" | |
| 32 | |
| 33 #define ARRAY_CHUNKSIZE 32 | |
| 34 /* The array of threads currently active in the application | |
| 35 (except the main thread) | |
| 36 The manipulation of an array here is safer than using a linked list. | |
| 37 */ | |
| 38 static int SDL_maxthreads = 0; | |
| 39 static int SDL_numthreads = 0; | |
| 40 static SDL_Thread **SDL_Threads = NULL; | |
| 41 static SDL_mutex *thread_lock = NULL; | |
| 42 int _creating_thread_lock = 0; | |
| 43 | |
| 44 int SDL_ThreadsInit(void) | |
| 45 { | |
| 46 int retval; | |
| 47 | |
| 48 retval = 0; | |
| 49 /* Set the thread lock creation flag so that we can reuse an | |
| 50 existing lock on the system - since this mutex never gets | |
| 51 destroyed (see SDL_ThreadsQuit()), we want to reuse it. | |
| 52 */ | |
| 53 _creating_thread_lock = 1; | |
| 54 thread_lock = SDL_CreateMutex(); | |
| 55 _creating_thread_lock = 0; | |
| 56 if ( thread_lock == NULL ) { | |
| 57 retval = -1; | |
| 58 } | |
| 59 return(retval); | |
| 60 } | |
| 61 | |
| 62 /* This should never be called... | |
| 63 If this is called by SDL_Quit(), we don't know whether or not we should | |
| 64 clean up threads here. If any threads are still running after this call, | |
| 65 they will no longer have access to any per-thread data. | |
| 66 */ | |
| 67 void SDL_ThreadsQuit() | |
| 68 { | |
| 69 SDL_mutex *mutex; | |
| 70 | |
| 71 mutex = thread_lock; | |
| 72 thread_lock = NULL; | |
| 73 if ( mutex != NULL ) { | |
| 74 SDL_DestroyMutex(mutex); | |
| 75 } | |
| 76 } | |
| 77 | |
| 78 /* Routines for manipulating the thread list */ | |
| 79 static void SDL_AddThread(SDL_Thread *thread) | |
| 80 { | |
| 81 SDL_Thread **threads; | |
| 82 | |
| 83 /* WARNING: | |
| 84 If the very first threads are created simultaneously, then | |
| 85 there could be a race condition causing memory corruption. | |
| 86 In practice, this isn't a problem because by definition there | |
| 87 is only one thread running the first time this is called. | |
| 88 */ | |
| 89 if ( thread_lock == NULL ) { | |
| 90 if ( SDL_ThreadsInit() < 0 ) { | |
| 91 return; | |
| 92 } | |
| 93 } | |
| 94 SDL_mutexP(thread_lock); | |
| 95 | |
| 96 /* Expand the list of threads, if necessary */ | |
| 97 #ifdef DEBUG_THREADS | |
| 98 printf("Adding thread (%d already - %d max)\n", | |
| 99 SDL_numthreads, SDL_maxthreads); | |
| 100 #endif | |
| 101 if ( SDL_numthreads == SDL_maxthreads ) { | |
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102 threads=(SDL_Thread **)SDL_malloc((SDL_maxthreads+ARRAY_CHUNKSIZE)* |
| 0 | 103 (sizeof *threads)); |
| 104 if ( threads == NULL ) { | |
| 105 SDL_OutOfMemory(); | |
| 106 goto done; | |
| 107 } | |
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108 SDL_memcpy(threads, SDL_Threads, SDL_numthreads*(sizeof *threads)); |
| 0 | 109 SDL_maxthreads += ARRAY_CHUNKSIZE; |
| 110 if ( SDL_Threads ) { | |
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111 SDL_free(SDL_Threads); |
| 0 | 112 } |
| 113 SDL_Threads = threads; | |
| 114 } | |
| 115 SDL_Threads[SDL_numthreads++] = thread; | |
| 116 done: | |
| 117 SDL_mutexV(thread_lock); | |
| 118 } | |
| 119 | |
| 120 static void SDL_DelThread(SDL_Thread *thread) | |
| 121 { | |
| 122 int i; | |
| 123 | |
| 124 if ( thread_lock ) { | |
| 125 SDL_mutexP(thread_lock); | |
| 126 for ( i=0; i<SDL_numthreads; ++i ) { | |
| 127 if ( thread == SDL_Threads[i] ) { | |
| 128 break; | |
| 129 } | |
| 130 } | |
| 131 if ( i < SDL_numthreads ) { | |
|
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132 if ( --SDL_numthreads > 0 ) { |
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133 while ( i < SDL_numthreads ) { |
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134 SDL_Threads[i] = SDL_Threads[i+1]; |
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135 ++i; |
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136 } |
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137 } else { |
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parents:
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138 SDL_maxthreads = 0; |
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parents:
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diff
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139 SDL_free(SDL_Threads); |
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140 SDL_Threads = NULL; |
| 0 | 141 } |
| 142 #ifdef DEBUG_THREADS | |
| 143 printf("Deleting thread (%d left - %d max)\n", | |
| 144 SDL_numthreads, SDL_maxthreads); | |
| 145 #endif | |
| 146 } | |
| 147 SDL_mutexV(thread_lock); | |
| 148 } | |
| 149 } | |
| 150 | |
| 151 /* The default (non-thread-safe) global error variable */ | |
| 152 static SDL_error SDL_global_error; | |
| 153 | |
| 154 /* Routine to get the thread-specific error variable */ | |
| 155 SDL_error *SDL_GetErrBuf(void) | |
| 156 { | |
| 157 SDL_error *errbuf; | |
| 158 | |
| 159 errbuf = &SDL_global_error; | |
| 160 if ( SDL_Threads ) { | |
| 161 int i; | |
| 162 Uint32 this_thread; | |
| 163 | |
| 164 this_thread = SDL_ThreadID(); | |
| 165 SDL_mutexP(thread_lock); | |
| 166 for ( i=0; i<SDL_numthreads; ++i ) { | |
| 167 if ( this_thread == SDL_Threads[i]->threadid ) { | |
| 168 errbuf = &SDL_Threads[i]->errbuf; | |
| 169 break; | |
| 170 } | |
| 171 } | |
| 172 SDL_mutexV(thread_lock); | |
| 173 } | |
| 174 return(errbuf); | |
| 175 } | |
| 176 | |
| 177 | |
| 178 /* Arguments and callback to setup and run the user thread function */ | |
| 179 typedef struct { | |
| 180 int (*func)(void *); | |
| 181 void *data; | |
| 182 SDL_Thread *info; | |
| 183 SDL_sem *wait; | |
| 184 } thread_args; | |
| 185 | |
| 186 void SDL_RunThread(void *data) | |
| 187 { | |
| 188 thread_args *args; | |
| 189 int (*userfunc)(void *); | |
| 190 void *userdata; | |
| 191 int *statusloc; | |
| 192 | |
| 193 /* Perform any system-dependent setup | |
| 194 - this function cannot fail, and cannot use SDL_SetError() | |
| 195 */ | |
| 196 SDL_SYS_SetupThread(); | |
| 197 | |
| 198 /* Get the thread id */ | |
| 199 args = (thread_args *)data; | |
| 200 args->info->threadid = SDL_ThreadID(); | |
| 201 | |
| 202 /* Figure out what function to run */ | |
| 203 userfunc = args->func; | |
| 204 userdata = args->data; | |
| 205 statusloc = &args->info->status; | |
| 206 | |
| 207 /* Wake up the parent thread */ | |
| 208 SDL_SemPost(args->wait); | |
| 209 | |
| 210 /* Run the function */ | |
| 211 *statusloc = userfunc(userdata); | |
| 212 } | |
| 213 | |
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parents:
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214 #if defined(_WIN32) || defined(__OS2__) |
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450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
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changeset
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215 #undef SDL_CreateThread |
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450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
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diff
changeset
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216 DECLSPEC SDL_Thread * SDLCALL SDL_CreateThread(int (*fn)(void *), void *data, pfnSDL_CurrentBeginThread pfnBeginThread, pfnSDL_CurrentEndThread pfnEndThread) |
| 1190 | 217 #else |
| 218 DECLSPEC SDL_Thread * SDLCALL SDL_CreateThread(int (*fn)(void *), void *data) | |
| 219 #endif | |
| 0 | 220 { |
| 221 SDL_Thread *thread; | |
| 222 thread_args *args; | |
| 223 int ret; | |
| 224 | |
| 225 /* Allocate memory for the thread info structure */ | |
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226 thread = (SDL_Thread *)SDL_malloc(sizeof(*thread)); |
| 0 | 227 if ( thread == NULL ) { |
| 228 SDL_OutOfMemory(); | |
| 229 return(NULL); | |
| 230 } | |
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231 SDL_memset(thread, 0, (sizeof *thread)); |
| 0 | 232 thread->status = -1; |
| 233 | |
| 234 /* Set up the arguments for the thread */ | |
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235 args = (thread_args *)SDL_malloc(sizeof(*args)); |
| 0 | 236 if ( args == NULL ) { |
| 237 SDL_OutOfMemory(); | |
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238 SDL_free(thread); |
| 0 | 239 return(NULL); |
| 240 } | |
| 241 args->func = fn; | |
| 242 args->data = data; | |
| 243 args->info = thread; | |
| 244 args->wait = SDL_CreateSemaphore(0); | |
| 245 if ( args->wait == NULL ) { | |
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246 SDL_free(thread); |
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247 SDL_free(args); |
| 0 | 248 return(NULL); |
| 249 } | |
| 250 | |
| 251 /* Add the thread to the list of available threads */ | |
| 252 SDL_AddThread(thread); | |
| 253 | |
| 254 /* Create the thread and go! */ | |
|
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It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
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changeset
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255 #if defined(_WIN32) || defined(__OS2__) |
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450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
1312
diff
changeset
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256 ret = SDL_SYS_CreateThread(thread, args, pfnBeginThread, pfnEndThread); |
| 1190 | 257 #else |
| 0 | 258 ret = SDL_SYS_CreateThread(thread, args); |
| 1190 | 259 #endif |
| 0 | 260 if ( ret >= 0 ) { |
| 261 /* Wait for the thread function to use arguments */ | |
| 262 SDL_SemWait(args->wait); | |
| 263 } else { | |
| 264 /* Oops, failed. Gotta free everything */ | |
| 265 SDL_DelThread(thread); | |
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266 SDL_free(thread); |
| 0 | 267 thread = NULL; |
| 268 } | |
| 269 SDL_DestroySemaphore(args->wait); | |
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270 SDL_free(args); |
| 0 | 271 |
| 272 /* Everything is running now */ | |
| 273 return(thread); | |
| 274 } | |
| 275 | |
| 276 void SDL_WaitThread(SDL_Thread *thread, int *status) | |
| 277 { | |
| 278 if ( thread ) { | |
| 279 SDL_SYS_WaitThread(thread); | |
| 280 if ( status ) { | |
| 281 *status = thread->status; | |
| 282 } | |
| 283 SDL_DelThread(thread); | |
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284 SDL_free(thread); |
| 0 | 285 } |
| 286 } | |
| 287 | |
| 288 Uint32 SDL_GetThreadID(SDL_Thread *thread) | |
| 289 { | |
| 290 Uint32 id; | |
| 291 | |
| 292 if ( thread ) { | |
| 293 id = thread->threadid; | |
| 294 } else { | |
| 295 id = SDL_ThreadID(); | |
| 296 } | |
| 297 return(id); | |
| 298 } | |
| 299 | |
| 300 void SDL_KillThread(SDL_Thread *thread) | |
| 301 { | |
| 302 if ( thread ) { | |
| 303 SDL_SYS_KillThread(thread); | |
| 304 SDL_WaitThread(thread, NULL); | |
| 305 } | |
| 306 } | |
| 307 |