Mercurial > sdl-ios-xcode
annotate src/thread/amigaos/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 | c9b51268668f |
| 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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c9b51268668f
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parents:
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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 <stdio.h> | |
| 26 #include <stdlib.h> | |
| 27 #include <string.h> | |
| 28 | |
| 29 #include "SDL_error.h" | |
| 30 #include "SDL_mutex.h" | |
| 31 #include "SDL_thread.h" | |
| 32 #include "SDL_thread_c.h" | |
| 33 #include "SDL_systhread.h" | |
| 34 | |
| 35 #define ARRAY_CHUNKSIZE 32 | |
| 36 /* The array of threads currently active in the application | |
| 37 (except the main thread) | |
| 38 The manipulation of an array here is safer than using a linked list. | |
| 39 */ | |
| 40 static int SDL_maxthreads = 0; | |
| 41 static int SDL_numthreads = 0; | |
| 42 static SDL_Thread **SDL_Threads = NULL; | |
| 43 static struct SignalSemaphore thread_lock; | |
| 44 int thread_lock_created = 0; | |
| 45 | |
| 46 int SDL_ThreadsInit(void) | |
| 47 { | |
| 48 InitSemaphore(&thread_lock); | |
| 49 thread_lock_created=1; | |
| 50 return 0; | |
| 51 } | |
| 52 | |
| 53 /* This should never be called... | |
| 54 If this is called by SDL_Quit(), we don't know whether or not we should | |
| 55 clean up threads here. If any threads are still running after this call, | |
| 56 they will no longer have access to any per-thread data. | |
| 57 */ | |
| 58 void SDL_ThreadsQuit() | |
| 59 { | |
| 60 thread_lock_created=0; | |
| 61 } | |
| 62 | |
| 63 /* Routines for manipulating the thread list */ | |
| 64 static void SDL_AddThread(SDL_Thread *thread) | |
| 65 { | |
| 66 SDL_Thread **threads; | |
| 67 | |
| 68 /* WARNING: | |
| 69 If the very first threads are created simultaneously, then | |
| 70 there could be a race condition causing memory corruption. | |
| 71 In practice, this isn't a problem because by definition there | |
| 72 is only one thread running the first time this is called. | |
| 73 */ | |
| 74 if ( !thread_lock_created ) { | |
| 75 if ( SDL_ThreadsInit() < 0 ) { | |
| 76 return; | |
| 77 } | |
| 78 } | |
| 79 ObtainSemaphore(&thread_lock); | |
| 80 | |
| 81 /* Expand the list of threads, if necessary */ | |
| 82 #ifdef DEBUG_THREADS | |
| 83 printf("Adding thread (%d already - %d max)\n", | |
| 84 SDL_numthreads, SDL_maxthreads); | |
| 85 #endif | |
| 86 if ( SDL_numthreads == SDL_maxthreads ) { | |
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87 threads=(SDL_Thread **)SDL_malloc((SDL_maxthreads+ARRAY_CHUNKSIZE)* |
| 0 | 88 (sizeof *threads)); |
| 89 if ( threads == NULL ) { | |
| 90 SDL_OutOfMemory(); | |
| 91 goto done; | |
| 92 } | |
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93 SDL_memcpy(threads, SDL_Threads, SDL_numthreads*(sizeof *threads)); |
| 0 | 94 SDL_maxthreads += ARRAY_CHUNKSIZE; |
| 95 if ( SDL_Threads ) { | |
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96 SDL_free(SDL_Threads); |
| 0 | 97 } |
| 98 SDL_Threads = threads; | |
| 99 } | |
| 100 SDL_Threads[SDL_numthreads++] = thread; | |
| 101 done: | |
| 102 ReleaseSemaphore(&thread_lock); | |
| 103 } | |
| 104 | |
| 105 static void SDL_DelThread(SDL_Thread *thread) | |
| 106 { | |
| 107 int i; | |
| 108 | |
| 109 if ( thread_lock_created ) { | |
| 110 ObtainSemaphore(&thread_lock); | |
| 111 for ( i=0; i<SDL_numthreads; ++i ) { | |
| 112 if ( thread == SDL_Threads[i] ) { | |
| 113 break; | |
| 114 } | |
| 115 } | |
| 116 if ( i < SDL_numthreads ) { | |
| 117 --SDL_numthreads; | |
| 118 while ( i < SDL_numthreads ) { | |
| 119 SDL_Threads[i] = SDL_Threads[i+1]; | |
| 120 ++i; | |
| 121 } | |
| 122 #ifdef DEBUG_THREADS | |
| 123 printf("Deleting thread (%d left - %d max)\n", | |
| 124 SDL_numthreads, SDL_maxthreads); | |
| 125 #endif | |
| 126 } | |
| 127 ReleaseSemaphore(&thread_lock); | |
| 128 } | |
| 129 } | |
| 130 | |
| 131 /* The default (non-thread-safe) global error variable */ | |
| 132 static SDL_error SDL_global_error; | |
| 133 | |
| 134 /* Routine to get the thread-specific error variable */ | |
| 135 SDL_error *SDL_GetErrBuf(void) | |
| 136 { | |
| 137 SDL_error *errbuf; | |
| 138 | |
| 139 errbuf = &SDL_global_error; | |
| 140 if ( SDL_Threads ) { | |
| 141 int i; | |
| 142 Uint32 this_thread; | |
| 143 | |
| 144 this_thread = SDL_ThreadID(); | |
| 145 ObtainSemaphore(&thread_lock); | |
| 146 for ( i=0; i<SDL_numthreads; ++i ) { | |
| 147 if ( this_thread == SDL_Threads[i]->threadid ) { | |
| 148 errbuf = &SDL_Threads[i]->errbuf; | |
| 149 break; | |
| 150 } | |
| 151 } | |
| 152 ReleaseSemaphore(&thread_lock); | |
| 153 } | |
| 154 return(errbuf); | |
| 155 } | |
| 156 | |
| 157 | |
| 158 /* Arguments and callback to setup and run the user thread function */ | |
| 159 typedef struct { | |
| 160 int (*func)(void *); | |
| 161 void *data; | |
| 162 SDL_Thread *info; | |
| 163 struct Task *wait; | |
| 164 } thread_args; | |
| 165 | |
| 166 void SDL_RunThread(void *data) | |
| 167 { | |
| 168 thread_args *args; | |
| 169 int (*userfunc)(void *); | |
| 170 void *userdata; | |
| 171 int *statusloc; | |
| 172 | |
| 173 /* Perform any system-dependent setup | |
| 174 - this function cannot fail, and cannot use SDL_SetError() | |
| 175 */ | |
| 176 SDL_SYS_SetupThread(); | |
| 177 | |
| 178 /* Get the thread id */ | |
| 179 args = (thread_args *)data; | |
| 180 args->info->threadid = SDL_ThreadID(); | |
| 181 | |
| 182 /* Figure out what function to run */ | |
| 183 userfunc = args->func; | |
| 184 userdata = args->data; | |
| 185 statusloc = &args->info->status; | |
| 186 | |
| 187 /* Wake up the parent thread */ | |
| 188 Signal(args->wait,SIGBREAKF_CTRL_E); | |
| 189 | |
| 190 /* Run the function */ | |
| 191 *statusloc = userfunc(userdata); | |
| 192 } | |
| 193 | |
| 194 SDL_Thread *SDL_CreateThread(int (*fn)(void *), void *data) | |
| 195 { | |
| 196 SDL_Thread *thread; | |
| 197 thread_args *args; | |
| 198 int ret; | |
| 199 | |
| 200 /* Allocate memory for the thread info structure */ | |
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201 thread = (SDL_Thread *)SDL_malloc(sizeof(*thread)); |
| 0 | 202 if ( thread == NULL ) { |
| 203 SDL_OutOfMemory(); | |
| 204 return(NULL); | |
| 205 } | |
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206 SDL_memset(thread, 0, (sizeof *thread)); |
| 0 | 207 thread->status = -1; |
| 208 | |
| 209 /* Set up the arguments for the thread */ | |
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210 args = (thread_args *)SDL_malloc(sizeof(*args)); |
| 0 | 211 if ( args == NULL ) { |
| 212 SDL_OutOfMemory(); | |
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213 SDL_free(thread); |
| 0 | 214 return(NULL); |
| 215 } | |
| 216 args->func = fn; | |
| 217 args->data = data; | |
| 218 args->info = thread; | |
| 219 args->wait = FindTask(NULL); | |
| 220 if ( args->wait == NULL ) { | |
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221 SDL_free(thread); |
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222 SDL_free(args); |
| 0 | 223 SDL_OutOfMemory(); |
| 224 return(NULL); | |
| 225 } | |
| 226 | |
| 227 /* Add the thread to the list of available threads */ | |
| 228 SDL_AddThread(thread); | |
| 229 | |
| 230 D(bug("Starting thread...\n")); | |
| 231 | |
| 232 /* Create the thread and go! */ | |
| 233 ret = SDL_SYS_CreateThread(thread, args); | |
| 234 if ( ret >= 0 ) { | |
| 235 D(bug("Waiting for thread CTRL_E...\n")); | |
| 236 /* Wait for the thread function to use arguments */ | |
| 237 Wait(SIGBREAKF_CTRL_E); | |
| 238 D(bug(" Arrived.")); | |
| 239 } else { | |
| 240 /* Oops, failed. Gotta free everything */ | |
| 241 SDL_DelThread(thread); | |
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242 SDL_free(thread); |
| 0 | 243 thread = NULL; |
| 244 } | |
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245 SDL_free(args); |
| 0 | 246 |
| 247 /* Everything is running now */ | |
| 248 return(thread); | |
| 249 } | |
| 250 | |
| 251 void SDL_WaitThread(SDL_Thread *thread, int *status) | |
| 252 { | |
| 253 if ( thread ) { | |
| 254 SDL_SYS_WaitThread(thread); | |
| 255 if ( status ) { | |
| 256 *status = thread->status; | |
| 257 } | |
| 258 SDL_DelThread(thread); | |
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259 SDL_free(thread); |
| 0 | 260 } |
| 261 } | |
| 262 | |
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263 Uint32 SDL_GetThreadID(SDL_Thread *thread) |
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264 { |
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265 Uint32 id; |
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266 |
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267 if ( thread ) { |
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268 id = thread->threadid; |
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269 } else { |
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270 id = SDL_ThreadID(); |
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271 } |
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272 return(id); |
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273 } |
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274 |
| 0 | 275 void SDL_KillThread(SDL_Thread *thread) |
| 276 { | |
| 277 if ( thread ) { | |
| 278 SDL_SYS_KillThread(thread); | |
| 279 SDL_WaitThread(thread, NULL); | |
| 280 } | |
| 281 } | |
| 282 |