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annotate src/thread/amigaos/SDL_thread.c @ 1668:4da1ee79c9af SDL-1.3

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more tweaking indent options
author Sam Lantinga <slouken@libsdl.org>
date Mon, 29 May 2006 04:04:35 +0000
parents 782fd950bd46
children
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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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
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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.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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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
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 /* System independent thread management routines for SDL */
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25
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26 #include "SDL_mutex.h"
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27 #include "SDL_thread.h"
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28 #include "../SDL_thread_c.h"
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29 #include "../SDL_systhread.h"
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30
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31 #define ARRAY_CHUNKSIZE 32
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32 /* The array of threads currently active in the application
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33 (except the main thread)
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34 The manipulation of an array here is safer than using a linked list.
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35 */
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36 static int SDL_maxthreads = 0;
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37 static int SDL_numthreads = 0;
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38 static SDL_Thread **SDL_Threads = NULL;
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39 static struct SignalSemaphore thread_lock;
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40 int thread_lock_created = 0;
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41
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42 int
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43 SDL_ThreadsInit(void)
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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;
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48 }
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49
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50 /* This should never be called...
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51 If this is called by SDL_Quit(), we don't know whether or not we should
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52 clean up threads here. If any threads are still running after this call,
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53 they will no longer have access to any per-thread data.
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54 */
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55 void
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56 SDL_ThreadsQuit()
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57 {
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58 thread_lock_created = 0;
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59 }
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60
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61 /* Routines for manipulating the thread list */
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62 static void
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63 SDL_AddThread(SDL_Thread * thread)
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64 {
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65 SDL_Thread **threads;
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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);
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79
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80 /* Expand the list of threads, if necessary */
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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);
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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);
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103 }
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104
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105 static void
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106 SDL_DelThread(SDL_Thread * thread)
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107 {
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108 int i;
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109
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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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123 #ifdef DEBUG_THREADS
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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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126 #endif
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127 }
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128 ReleaseSemaphore(&thread_lock);
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129 }
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130 }
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131
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132 /* The default (non-thread-safe) global error variable */
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133 static SDL_error SDL_global_error;
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134
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135 /* Routine to get the thread-specific error variable */
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136 SDL_error *
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137 SDL_GetErrBuf(void)
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138 {
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139 SDL_error *errbuf;
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140
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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;
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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);
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157 }
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158
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159
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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;
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167 } thread_args;
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168
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169 void
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170 SDL_RunThread(void *data)
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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;
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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();
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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();
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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;
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190
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191 /* Wake up the parent thread */
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192 Signal(args->wait, SIGBREAKF_CTRL_E);
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193
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194 /* Run the function */
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195 *statusloc = userfunc(userdata);
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196 }
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197
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198 SDL_Thread *
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199 SDL_CreateThread(int (*fn) (void *), void *data)
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200 {
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201 SDL_Thread *thread;
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202 thread_args *args;
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203 int ret;
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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;
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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 }
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231
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232 /* Add the thread to the list of available threads */
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233 SDL_AddThread(thread);
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234
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235 D(bug("Starting thread...\n"));
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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);
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251
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252 /* Everything is running now */
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253 return (thread);
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254 }
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255
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256 void
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257 SDL_WaitThread(SDL_Thread * thread, int *status)
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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 }
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267 }
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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)
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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 }
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289 }
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290
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291 /* vi: set ts=4 sw=4 expandtab: */