Mercurial > sdl-ios-xcode
annotate src/thread/amigaos/SDL_thread.c @ 1668:4da1ee79c9af SDL-1.3
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author | Sam Lantinga <slouken@libsdl.org> |
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date | Mon, 29 May 2006 04:04:35 +0000 |
parents | 782fd950bd46 |
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rev | line source |
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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 | |
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42 int |
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43 SDL_ThreadsInit(void) |
0 | 44 { |
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45 InitSemaphore(&thread_lock); |
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46 thread_lock_created = 1; |
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47 return 0; |
0 | 48 } |
49 | |
50 /* This should never be called... | |
51 If this is called by SDL_Quit(), we don't know whether or not we should | |
52 clean up threads here. If any threads are still running after this call, | |
53 they will no longer have access to any per-thread data. | |
54 */ | |
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55 void |
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56 SDL_ThreadsQuit() |
0 | 57 { |
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58 thread_lock_created = 0; |
0 | 59 } |
60 | |
61 /* Routines for manipulating the thread list */ | |
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62 static void |
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63 SDL_AddThread(SDL_Thread * thread) |
0 | 64 { |
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65 SDL_Thread **threads; |
0 | 66 |
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67 /* WARNING: |
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68 If the very first threads are created simultaneously, then |
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69 there could be a race condition causing memory corruption. |
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70 In practice, this isn't a problem because by definition there |
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71 is only one thread running the first time this is called. |
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72 */ |
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73 if (!thread_lock_created) { |
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74 if (SDL_ThreadsInit() < 0) { |
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75 return; |
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76 } |
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77 } |
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78 ObtainSemaphore(&thread_lock); |
0 | 79 |
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80 /* Expand the list of threads, if necessary */ |
0 | 81 #ifdef DEBUG_THREADS |
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82 printf("Adding thread (%d already - %d max)\n", |
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83 SDL_numthreads, SDL_maxthreads); |
0 | 84 #endif |
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85 if (SDL_numthreads == SDL_maxthreads) { |
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86 threads = |
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87 (SDL_Thread **) SDL_malloc((SDL_maxthreads + ARRAY_CHUNKSIZE) * |
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88 (sizeof *threads)); |
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89 if (threads == NULL) { |
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90 SDL_OutOfMemory(); |
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91 goto done; |
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92 } |
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93 SDL_memcpy(threads, SDL_Threads, SDL_numthreads * (sizeof *threads)); |
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94 SDL_maxthreads += ARRAY_CHUNKSIZE; |
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95 if (SDL_Threads) { |
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96 SDL_free(SDL_Threads); |
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97 } |
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98 SDL_Threads = threads; |
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99 } |
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100 SDL_Threads[SDL_numthreads++] = thread; |
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101 done: |
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102 ReleaseSemaphore(&thread_lock); |
0 | 103 } |
104 | |
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105 static void |
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106 SDL_DelThread(SDL_Thread * thread) |
0 | 107 { |
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108 int i; |
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110 if (thread_lock_created) { |
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111 ObtainSemaphore(&thread_lock); |
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112 for (i = 0; i < SDL_numthreads; ++i) { |
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113 if (thread == SDL_Threads[i]) { |
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114 break; |
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115 } |
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116 } |
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117 if (i < SDL_numthreads) { |
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118 --SDL_numthreads; |
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119 while (i < SDL_numthreads) { |
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120 SDL_Threads[i] = SDL_Threads[i + 1]; |
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121 ++i; |
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122 } |
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124 printf("Deleting thread (%d left - %d max)\n", |
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125 SDL_numthreads, SDL_maxthreads); |
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127 } |
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128 ReleaseSemaphore(&thread_lock); |
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129 } |
0 | 130 } |
131 | |
132 /* The default (non-thread-safe) global error variable */ | |
133 static SDL_error SDL_global_error; | |
134 | |
135 /* Routine to get the thread-specific error variable */ | |
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136 SDL_error * |
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137 SDL_GetErrBuf(void) |
0 | 138 { |
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139 SDL_error *errbuf; |
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141 errbuf = &SDL_global_error; |
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142 if (SDL_Threads) { |
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143 int i; |
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144 Uint32 this_thread; |
0 | 145 |
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146 this_thread = SDL_ThreadID(); |
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147 ObtainSemaphore(&thread_lock); |
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148 for (i = 0; i < SDL_numthreads; ++i) { |
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149 if (this_thread == SDL_Threads[i]->threadid) { |
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150 errbuf = &SDL_Threads[i]->errbuf; |
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151 break; |
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152 } |
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153 } |
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154 ReleaseSemaphore(&thread_lock); |
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155 } |
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156 return (errbuf); |
0 | 157 } |
158 | |
159 | |
160 /* Arguments and callback to setup and run the user thread function */ | |
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161 typedef struct |
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162 { |
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163 int (*func) (void *); |
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164 void *data; |
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165 SDL_Thread *info; |
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166 struct Task *wait; |
0 | 167 } thread_args; |
168 | |
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169 void |
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170 SDL_RunThread(void *data) |
0 | 171 { |
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172 thread_args *args; |
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173 int (*userfunc) (void *); |
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174 void *userdata; |
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175 int *statusloc; |
0 | 176 |
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177 /* Perform any system-dependent setup |
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178 - this function cannot fail, and cannot use SDL_SetError() |
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179 */ |
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180 SDL_SYS_SetupThread(); |
0 | 181 |
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182 /* Get the thread id */ |
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183 args = (thread_args *) data; |
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184 args->info->threadid = SDL_ThreadID(); |
0 | 185 |
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186 /* Figure out what function to run */ |
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187 userfunc = args->func; |
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188 userdata = args->data; |
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189 statusloc = &args->info->status; |
0 | 190 |
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191 /* Wake up the parent thread */ |
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192 Signal(args->wait, SIGBREAKF_CTRL_E); |
0 | 193 |
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194 /* Run the function */ |
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195 *statusloc = userfunc(userdata); |
0 | 196 } |
197 | |
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198 SDL_Thread * |
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199 SDL_CreateThread(int (*fn) (void *), void *data) |
0 | 200 { |
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201 SDL_Thread *thread; |
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202 thread_args *args; |
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203 int ret; |
0 | 204 |
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205 /* Allocate memory for the thread info structure */ |
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206 thread = (SDL_Thread *) SDL_malloc(sizeof(*thread)); |
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207 if (thread == NULL) { |
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208 SDL_OutOfMemory(); |
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209 return (NULL); |
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210 } |
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211 SDL_memset(thread, 0, (sizeof *thread)); |
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212 thread->status = -1; |
0 | 213 |
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214 /* Set up the arguments for the thread */ |
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215 args = (thread_args *) SDL_malloc(sizeof(*args)); |
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216 if (args == NULL) { |
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217 SDL_OutOfMemory(); |
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218 SDL_free(thread); |
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219 return (NULL); |
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220 } |
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221 args->func = fn; |
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222 args->data = data; |
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223 args->info = thread; |
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224 args->wait = FindTask(NULL); |
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225 if (args->wait == NULL) { |
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226 SDL_free(thread); |
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227 SDL_free(args); |
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228 SDL_OutOfMemory(); |
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229 return (NULL); |
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230 } |
0 | 231 |
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232 /* Add the thread to the list of available threads */ |
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233 SDL_AddThread(thread); |
0 | 234 |
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235 D(bug("Starting thread...\n")); |
0 | 236 |
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237 /* Create the thread and go! */ |
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238 ret = SDL_SYS_CreateThread(thread, args); |
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239 if (ret >= 0) { |
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240 D(bug("Waiting for thread CTRL_E...\n")); |
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241 /* Wait for the thread function to use arguments */ |
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242 Wait(SIGBREAKF_CTRL_E); |
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243 D(bug(" Arrived.")); |
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244 } else { |
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245 /* Oops, failed. Gotta free everything */ |
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246 SDL_DelThread(thread); |
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247 SDL_free(thread); |
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248 thread = NULL; |
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249 } |
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250 SDL_free(args); |
0 | 251 |
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252 /* Everything is running now */ |
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253 return (thread); |
0 | 254 } |
255 | |
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256 void |
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257 SDL_WaitThread(SDL_Thread * thread, int *status) |
0 | 258 { |
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259 if (thread) { |
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260 SDL_SYS_WaitThread(thread); |
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261 if (status) { |
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262 *status = thread->status; |
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263 } |
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264 SDL_DelThread(thread); |
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265 SDL_free(thread); |
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266 } |
0 | 267 } |
268 | |
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269 Uint32 |
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270 SDL_GetThreadID(SDL_Thread * thread) |
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271 { |
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272 Uint32 id; |
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273 |
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274 if (thread) { |
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275 id = thread->threadid; |
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276 } else { |
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277 id = SDL_ThreadID(); |
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278 } |
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279 return (id); |
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280 } |
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281 |
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282 void |
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283 SDL_KillThread(SDL_Thread * thread) |
0 | 284 { |
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285 if (thread) { |
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286 SDL_SYS_KillThread(thread); |
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287 SDL_WaitThread(thread, NULL); |
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288 } |
0 | 289 } |
290 | |
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291 /* vi: set ts=4 sw=4 expandtab: */ |