Mercurial > sdl-ios-xcode
annotate src/thread/amigaos/SDL_thread.c @ 1635:92947e3a18db
Make sure code is only compiled if the appropriate subsystem is enabled
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 14 Apr 2006 04:46:47 +0000 |
| parents | d910939febfa |
| children | 782fd950bd46 c121d94672cb |
| 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" | |
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28 #include "../SDL_thread_c.h" |
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29 #include "../SDL_systhread.h" |
| 0 | 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 struct SignalSemaphore thread_lock; | |
| 40 int thread_lock_created = 0; | |
| 41 | |
| 42 int SDL_ThreadsInit(void) | |
| 43 { | |
| 44 InitSemaphore(&thread_lock); | |
| 45 thread_lock_created=1; | |
| 46 return 0; | |
| 47 } | |
| 48 | |
| 49 /* This should never be called... | |
| 50 If this is called by SDL_Quit(), we don't know whether or not we should | |
| 51 clean up threads here. If any threads are still running after this call, | |
| 52 they will no longer have access to any per-thread data. | |
| 53 */ | |
| 54 void SDL_ThreadsQuit() | |
| 55 { | |
| 56 thread_lock_created=0; | |
| 57 } | |
| 58 | |
| 59 /* Routines for manipulating the thread list */ | |
| 60 static void SDL_AddThread(SDL_Thread *thread) | |
| 61 { | |
| 62 SDL_Thread **threads; | |
| 63 | |
| 64 /* WARNING: | |
| 65 If the very first threads are created simultaneously, then | |
| 66 there could be a race condition causing memory corruption. | |
| 67 In practice, this isn't a problem because by definition there | |
| 68 is only one thread running the first time this is called. | |
| 69 */ | |
| 70 if ( !thread_lock_created ) { | |
| 71 if ( SDL_ThreadsInit() < 0 ) { | |
| 72 return; | |
| 73 } | |
| 74 } | |
| 75 ObtainSemaphore(&thread_lock); | |
| 76 | |
| 77 /* Expand the list of threads, if necessary */ | |
| 78 #ifdef DEBUG_THREADS | |
| 79 printf("Adding thread (%d already - %d max)\n", | |
| 80 SDL_numthreads, SDL_maxthreads); | |
| 81 #endif | |
| 82 if ( SDL_numthreads == SDL_maxthreads ) { | |
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83 threads=(SDL_Thread **)SDL_malloc((SDL_maxthreads+ARRAY_CHUNKSIZE)* |
| 0 | 84 (sizeof *threads)); |
| 85 if ( threads == NULL ) { | |
| 86 SDL_OutOfMemory(); | |
| 87 goto done; | |
| 88 } | |
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89 SDL_memcpy(threads, SDL_Threads, SDL_numthreads*(sizeof *threads)); |
| 0 | 90 SDL_maxthreads += ARRAY_CHUNKSIZE; |
| 91 if ( SDL_Threads ) { | |
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92 SDL_free(SDL_Threads); |
| 0 | 93 } |
| 94 SDL_Threads = threads; | |
| 95 } | |
| 96 SDL_Threads[SDL_numthreads++] = thread; | |
| 97 done: | |
| 98 ReleaseSemaphore(&thread_lock); | |
| 99 } | |
| 100 | |
| 101 static void SDL_DelThread(SDL_Thread *thread) | |
| 102 { | |
| 103 int i; | |
| 104 | |
| 105 if ( thread_lock_created ) { | |
| 106 ObtainSemaphore(&thread_lock); | |
| 107 for ( i=0; i<SDL_numthreads; ++i ) { | |
| 108 if ( thread == SDL_Threads[i] ) { | |
| 109 break; | |
| 110 } | |
| 111 } | |
| 112 if ( i < SDL_numthreads ) { | |
| 113 --SDL_numthreads; | |
| 114 while ( i < SDL_numthreads ) { | |
| 115 SDL_Threads[i] = SDL_Threads[i+1]; | |
| 116 ++i; | |
| 117 } | |
| 118 #ifdef DEBUG_THREADS | |
| 119 printf("Deleting thread (%d left - %d max)\n", | |
| 120 SDL_numthreads, SDL_maxthreads); | |
| 121 #endif | |
| 122 } | |
| 123 ReleaseSemaphore(&thread_lock); | |
| 124 } | |
| 125 } | |
| 126 | |
| 127 /* The default (non-thread-safe) global error variable */ | |
| 128 static SDL_error SDL_global_error; | |
| 129 | |
| 130 /* Routine to get the thread-specific error variable */ | |
| 131 SDL_error *SDL_GetErrBuf(void) | |
| 132 { | |
| 133 SDL_error *errbuf; | |
| 134 | |
| 135 errbuf = &SDL_global_error; | |
| 136 if ( SDL_Threads ) { | |
| 137 int i; | |
| 138 Uint32 this_thread; | |
| 139 | |
| 140 this_thread = SDL_ThreadID(); | |
| 141 ObtainSemaphore(&thread_lock); | |
| 142 for ( i=0; i<SDL_numthreads; ++i ) { | |
| 143 if ( this_thread == SDL_Threads[i]->threadid ) { | |
| 144 errbuf = &SDL_Threads[i]->errbuf; | |
| 145 break; | |
| 146 } | |
| 147 } | |
| 148 ReleaseSemaphore(&thread_lock); | |
| 149 } | |
| 150 return(errbuf); | |
| 151 } | |
| 152 | |
| 153 | |
| 154 /* Arguments and callback to setup and run the user thread function */ | |
| 155 typedef struct { | |
| 156 int (*func)(void *); | |
| 157 void *data; | |
| 158 SDL_Thread *info; | |
| 159 struct Task *wait; | |
| 160 } thread_args; | |
| 161 | |
| 162 void SDL_RunThread(void *data) | |
| 163 { | |
| 164 thread_args *args; | |
| 165 int (*userfunc)(void *); | |
| 166 void *userdata; | |
| 167 int *statusloc; | |
| 168 | |
| 169 /* Perform any system-dependent setup | |
| 170 - this function cannot fail, and cannot use SDL_SetError() | |
| 171 */ | |
| 172 SDL_SYS_SetupThread(); | |
| 173 | |
| 174 /* Get the thread id */ | |
| 175 args = (thread_args *)data; | |
| 176 args->info->threadid = SDL_ThreadID(); | |
| 177 | |
| 178 /* Figure out what function to run */ | |
| 179 userfunc = args->func; | |
| 180 userdata = args->data; | |
| 181 statusloc = &args->info->status; | |
| 182 | |
| 183 /* Wake up the parent thread */ | |
| 184 Signal(args->wait,SIGBREAKF_CTRL_E); | |
| 185 | |
| 186 /* Run the function */ | |
| 187 *statusloc = userfunc(userdata); | |
| 188 } | |
| 189 | |
| 190 SDL_Thread *SDL_CreateThread(int (*fn)(void *), void *data) | |
| 191 { | |
| 192 SDL_Thread *thread; | |
| 193 thread_args *args; | |
| 194 int ret; | |
| 195 | |
| 196 /* Allocate memory for the thread info structure */ | |
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197 thread = (SDL_Thread *)SDL_malloc(sizeof(*thread)); |
| 0 | 198 if ( thread == NULL ) { |
| 199 SDL_OutOfMemory(); | |
| 200 return(NULL); | |
| 201 } | |
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202 SDL_memset(thread, 0, (sizeof *thread)); |
| 0 | 203 thread->status = -1; |
| 204 | |
| 205 /* Set up the arguments for the thread */ | |
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206 args = (thread_args *)SDL_malloc(sizeof(*args)); |
| 0 | 207 if ( args == NULL ) { |
| 208 SDL_OutOfMemory(); | |
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209 SDL_free(thread); |
| 0 | 210 return(NULL); |
| 211 } | |
| 212 args->func = fn; | |
| 213 args->data = data; | |
| 214 args->info = thread; | |
| 215 args->wait = FindTask(NULL); | |
| 216 if ( args->wait == NULL ) { | |
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217 SDL_free(thread); |
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218 SDL_free(args); |
| 0 | 219 SDL_OutOfMemory(); |
| 220 return(NULL); | |
| 221 } | |
| 222 | |
| 223 /* Add the thread to the list of available threads */ | |
| 224 SDL_AddThread(thread); | |
| 225 | |
| 226 D(bug("Starting thread...\n")); | |
| 227 | |
| 228 /* Create the thread and go! */ | |
| 229 ret = SDL_SYS_CreateThread(thread, args); | |
| 230 if ( ret >= 0 ) { | |
| 231 D(bug("Waiting for thread CTRL_E...\n")); | |
| 232 /* Wait for the thread function to use arguments */ | |
| 233 Wait(SIGBREAKF_CTRL_E); | |
| 234 D(bug(" Arrived.")); | |
| 235 } else { | |
| 236 /* Oops, failed. Gotta free everything */ | |
| 237 SDL_DelThread(thread); | |
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238 SDL_free(thread); |
| 0 | 239 thread = NULL; |
| 240 } | |
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241 SDL_free(args); |
| 0 | 242 |
| 243 /* Everything is running now */ | |
| 244 return(thread); | |
| 245 } | |
| 246 | |
| 247 void SDL_WaitThread(SDL_Thread *thread, int *status) | |
| 248 { | |
| 249 if ( thread ) { | |
| 250 SDL_SYS_WaitThread(thread); | |
| 251 if ( status ) { | |
| 252 *status = thread->status; | |
| 253 } | |
| 254 SDL_DelThread(thread); | |
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255 SDL_free(thread); |
| 0 | 256 } |
| 257 } | |
| 258 | |
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259 Uint32 SDL_GetThreadID(SDL_Thread *thread) |
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260 { |
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261 Uint32 id; |
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262 |
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263 if ( thread ) { |
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264 id = thread->threadid; |
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265 } else { |
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266 id = SDL_ThreadID(); |
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267 } |
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268 return(id); |
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269 } |
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270 |
| 0 | 271 void SDL_KillThread(SDL_Thread *thread) |
| 272 { | |
| 273 if ( thread ) { | |
| 274 SDL_SYS_KillThread(thread); | |
| 275 SDL_WaitThread(thread, NULL); | |
| 276 } | |
| 277 } | |
| 278 |