Mercurial > sdl-ios-xcode
annotate src/thread/amigaos/SDL_thread.c @ 648:12a21d82a060
Exposed SDL_LoadObject(), SDL_LoadFunction(), and SDL_UnloadObject() APIs
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 10 Jul 2003 07:46:19 +0000 |
| parents | f6ffac90895c |
| children | b8d311d90021 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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f6ffac90895c
Updated copyright information for 2002
Sam Lantinga <slouken@libsdl.org>
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 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 | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
252
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Updated the source with the correct e-mail address
Sam Lantinga <slouken@libsdl.org>
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 /* System independent thread management routines for SDL */ | |
| 29 | |
| 30 #include <stdio.h> | |
| 31 #include <stdlib.h> | |
| 32 #include <string.h> | |
| 33 | |
| 34 #include "SDL_error.h" | |
| 35 #include "SDL_mutex.h" | |
| 36 #include "SDL_thread.h" | |
| 37 #include "SDL_thread_c.h" | |
| 38 #include "SDL_systhread.h" | |
| 39 | |
| 40 #define ARRAY_CHUNKSIZE 32 | |
| 41 /* The array of threads currently active in the application | |
| 42 (except the main thread) | |
| 43 The manipulation of an array here is safer than using a linked list. | |
| 44 */ | |
| 45 static int SDL_maxthreads = 0; | |
| 46 static int SDL_numthreads = 0; | |
| 47 static SDL_Thread **SDL_Threads = NULL; | |
| 48 static struct SignalSemaphore thread_lock; | |
| 49 int thread_lock_created = 0; | |
| 50 | |
| 51 int SDL_ThreadsInit(void) | |
| 52 { | |
| 53 InitSemaphore(&thread_lock); | |
| 54 thread_lock_created=1; | |
| 55 return 0; | |
| 56 } | |
| 57 | |
| 58 /* This should never be called... | |
| 59 If this is called by SDL_Quit(), we don't know whether or not we should | |
| 60 clean up threads here. If any threads are still running after this call, | |
| 61 they will no longer have access to any per-thread data. | |
| 62 */ | |
| 63 void SDL_ThreadsQuit() | |
| 64 { | |
| 65 thread_lock_created=0; | |
| 66 } | |
| 67 | |
| 68 /* Routines for manipulating the thread list */ | |
| 69 static void SDL_AddThread(SDL_Thread *thread) | |
| 70 { | |
| 71 SDL_Thread **threads; | |
| 72 | |
| 73 /* WARNING: | |
| 74 If the very first threads are created simultaneously, then | |
| 75 there could be a race condition causing memory corruption. | |
| 76 In practice, this isn't a problem because by definition there | |
| 77 is only one thread running the first time this is called. | |
| 78 */ | |
| 79 if ( !thread_lock_created ) { | |
| 80 if ( SDL_ThreadsInit() < 0 ) { | |
| 81 return; | |
| 82 } | |
| 83 } | |
| 84 ObtainSemaphore(&thread_lock); | |
| 85 | |
| 86 /* Expand the list of threads, if necessary */ | |
| 87 #ifdef DEBUG_THREADS | |
| 88 printf("Adding thread (%d already - %d max)\n", | |
| 89 SDL_numthreads, SDL_maxthreads); | |
| 90 #endif | |
| 91 if ( SDL_numthreads == SDL_maxthreads ) { | |
| 92 threads=(SDL_Thread **)malloc((SDL_maxthreads+ARRAY_CHUNKSIZE)* | |
| 93 (sizeof *threads)); | |
| 94 if ( threads == NULL ) { | |
| 95 SDL_OutOfMemory(); | |
| 96 goto done; | |
| 97 } | |
| 98 memcpy(threads, SDL_Threads, SDL_numthreads*(sizeof *threads)); | |
| 99 SDL_maxthreads += ARRAY_CHUNKSIZE; | |
| 100 if ( SDL_Threads ) { | |
| 101 free(SDL_Threads); | |
| 102 } | |
| 103 SDL_Threads = threads; | |
| 104 } | |
| 105 SDL_Threads[SDL_numthreads++] = thread; | |
| 106 done: | |
| 107 ReleaseSemaphore(&thread_lock); | |
| 108 } | |
| 109 | |
| 110 static void SDL_DelThread(SDL_Thread *thread) | |
| 111 { | |
| 112 int i; | |
| 113 | |
| 114 if ( thread_lock_created ) { | |
| 115 ObtainSemaphore(&thread_lock); | |
| 116 for ( i=0; i<SDL_numthreads; ++i ) { | |
| 117 if ( thread == SDL_Threads[i] ) { | |
| 118 break; | |
| 119 } | |
| 120 } | |
| 121 if ( i < SDL_numthreads ) { | |
| 122 --SDL_numthreads; | |
| 123 while ( i < SDL_numthreads ) { | |
| 124 SDL_Threads[i] = SDL_Threads[i+1]; | |
| 125 ++i; | |
| 126 } | |
| 127 #ifdef DEBUG_THREADS | |
| 128 printf("Deleting thread (%d left - %d max)\n", | |
| 129 SDL_numthreads, SDL_maxthreads); | |
| 130 #endif | |
| 131 } | |
| 132 ReleaseSemaphore(&thread_lock); | |
| 133 } | |
| 134 } | |
| 135 | |
| 136 /* The default (non-thread-safe) global error variable */ | |
| 137 static SDL_error SDL_global_error; | |
| 138 | |
| 139 /* Routine to get the thread-specific error variable */ | |
| 140 SDL_error *SDL_GetErrBuf(void) | |
| 141 { | |
| 142 SDL_error *errbuf; | |
| 143 | |
| 144 errbuf = &SDL_global_error; | |
| 145 if ( SDL_Threads ) { | |
| 146 int i; | |
| 147 Uint32 this_thread; | |
| 148 | |
| 149 this_thread = SDL_ThreadID(); | |
| 150 ObtainSemaphore(&thread_lock); | |
| 151 for ( i=0; i<SDL_numthreads; ++i ) { | |
| 152 if ( this_thread == SDL_Threads[i]->threadid ) { | |
| 153 errbuf = &SDL_Threads[i]->errbuf; | |
| 154 break; | |
| 155 } | |
| 156 } | |
| 157 ReleaseSemaphore(&thread_lock); | |
| 158 } | |
| 159 return(errbuf); | |
| 160 } | |
| 161 | |
| 162 | |
| 163 /* Arguments and callback to setup and run the user thread function */ | |
| 164 typedef struct { | |
| 165 int (*func)(void *); | |
| 166 void *data; | |
| 167 SDL_Thread *info; | |
| 168 struct Task *wait; | |
| 169 } thread_args; | |
| 170 | |
| 171 void SDL_RunThread(void *data) | |
| 172 { | |
| 173 thread_args *args; | |
| 174 int (*userfunc)(void *); | |
| 175 void *userdata; | |
| 176 int *statusloc; | |
| 177 | |
| 178 /* Perform any system-dependent setup | |
| 179 - this function cannot fail, and cannot use SDL_SetError() | |
| 180 */ | |
| 181 SDL_SYS_SetupThread(); | |
| 182 | |
| 183 /* Get the thread id */ | |
| 184 args = (thread_args *)data; | |
| 185 args->info->threadid = SDL_ThreadID(); | |
| 186 | |
| 187 /* Figure out what function to run */ | |
| 188 userfunc = args->func; | |
| 189 userdata = args->data; | |
| 190 statusloc = &args->info->status; | |
| 191 | |
| 192 /* Wake up the parent thread */ | |
| 193 Signal(args->wait,SIGBREAKF_CTRL_E); | |
| 194 | |
| 195 /* Run the function */ | |
| 196 *statusloc = userfunc(userdata); | |
| 197 } | |
| 198 | |
| 199 SDL_Thread *SDL_CreateThread(int (*fn)(void *), void *data) | |
| 200 { | |
| 201 SDL_Thread *thread; | |
| 202 thread_args *args; | |
| 203 int ret; | |
| 204 | |
| 205 /* Allocate memory for the thread info structure */ | |
| 206 thread = (SDL_Thread *)malloc(sizeof(*thread)); | |
| 207 if ( thread == NULL ) { | |
| 208 SDL_OutOfMemory(); | |
| 209 return(NULL); | |
| 210 } | |
| 211 memset(thread, 0, (sizeof *thread)); | |
| 212 thread->status = -1; | |
| 213 | |
| 214 /* Set up the arguments for the thread */ | |
| 215 args = (thread_args *)malloc(sizeof(*args)); | |
| 216 if ( args == NULL ) { | |
| 217 SDL_OutOfMemory(); | |
| 218 free(thread); | |
| 219 return(NULL); | |
| 220 } | |
| 221 args->func = fn; | |
| 222 args->data = data; | |
| 223 args->info = thread; | |
| 224 args->wait = FindTask(NULL); | |
| 225 if ( args->wait == NULL ) { | |
| 226 free(thread); | |
| 227 free(args); | |
| 228 SDL_OutOfMemory(); | |
| 229 return(NULL); | |
| 230 } | |
| 231 | |
| 232 /* Add the thread to the list of available threads */ | |
| 233 SDL_AddThread(thread); | |
| 234 | |
| 235 D(bug("Starting thread...\n")); | |
| 236 | |
| 237 /* Create the thread and go! */ | |
| 238 ret = SDL_SYS_CreateThread(thread, args); | |
| 239 if ( ret >= 0 ) { | |
| 240 D(bug("Waiting for thread CTRL_E...\n")); | |
| 241 /* Wait for the thread function to use arguments */ | |
| 242 Wait(SIGBREAKF_CTRL_E); | |
| 243 D(bug(" Arrived.")); | |
| 244 } else { | |
| 245 /* Oops, failed. Gotta free everything */ | |
| 246 SDL_DelThread(thread); | |
| 247 free(thread); | |
| 248 thread = NULL; | |
| 249 } | |
| 250 free(args); | |
| 251 | |
| 252 /* Everything is running now */ | |
| 253 return(thread); | |
| 254 } | |
| 255 | |
| 256 void SDL_WaitThread(SDL_Thread *thread, int *status) | |
| 257 { | |
| 258 if ( thread ) { | |
| 259 SDL_SYS_WaitThread(thread); | |
| 260 if ( status ) { | |
| 261 *status = thread->status; | |
| 262 } | |
| 263 SDL_DelThread(thread); | |
| 264 free(thread); | |
| 265 } | |
| 266 } | |
| 267 | |
|
21
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
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268 Uint32 SDL_GetThreadID(SDL_Thread *thread) |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
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269 { |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
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270 Uint32 id; |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
271 |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
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272 if ( thread ) { |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
273 id = thread->threadid; |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
274 } else { |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
275 id = SDL_ThreadID(); |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
276 } |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
277 return(id); |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
278 } |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
279 |
| 0 | 280 void SDL_KillThread(SDL_Thread *thread) |
| 281 { | |
| 282 if ( thread ) { | |
| 283 SDL_SYS_KillThread(thread); | |
| 284 SDL_WaitThread(thread, NULL); | |
| 285 } | |
| 286 } | |
| 287 |