annotate src/thread/amigaos/SDL_thread.c @ 1338:604d73db6802

Removed uses of stdlib.h and string.h
author Sam Lantinga <slouken@libsdl.org>
date Tue, 07 Feb 2006 09:29:18 +0000
parents 3692456e7b0f
children c71e05b4dc2e
rev   line source
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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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e8157fcb3114 Updated the source with the correct e-mail address
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20 slouken@libsdl.org
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21 */
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22
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23 /* System independent thread management routines for SDL */
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24
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25 #include "SDL_stdlib.h"
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26 #include "SDL_string.h"
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27 #include "SDL_error.h"
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28 #include "SDL_mutex.h"
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29 #include "SDL_thread.h"
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30 #include "SDL_thread_c.h"
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31 #include "SDL_systhread.h"
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32
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33 #define ARRAY_CHUNKSIZE 32
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34 /* The array of threads currently active in the application
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35 (except the main thread)
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36 The manipulation of an array here is safer than using a linked list.
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37 */
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38 static int SDL_maxthreads = 0;
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39 static int SDL_numthreads = 0;
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40 static SDL_Thread **SDL_Threads = NULL;
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41 static struct SignalSemaphore thread_lock;
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42 int thread_lock_created = 0;
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43
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44 int SDL_ThreadsInit(void)
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45 {
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46 InitSemaphore(&thread_lock);
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47 thread_lock_created=1;
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48 return 0;
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49 }
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50
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51 /* This should never be called...
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52 If this is called by SDL_Quit(), we don't know whether or not we should
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53 clean up threads here. If any threads are still running after this call,
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54 they will no longer have access to any per-thread data.
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55 */
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56 void 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 SDL_AddThread(SDL_Thread *thread)
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63 {
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64 SDL_Thread **threads;
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65
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66 /* WARNING:
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67 If the very first threads are created simultaneously, then
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68 there could be a race condition causing memory corruption.
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69 In practice, this isn't a problem because by definition there
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70 is only one thread running the first time this is called.
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71 */
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72 if ( !thread_lock_created ) {
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73 if ( SDL_ThreadsInit() < 0 ) {
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74 return;
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75 }
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76 }
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77 ObtainSemaphore(&thread_lock);
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78
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79 /* Expand the list of threads, if necessary */
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80 #ifdef DEBUG_THREADS
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81 printf("Adding thread (%d already - %d max)\n",
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82 SDL_numthreads, SDL_maxthreads);
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83 #endif
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84 if ( SDL_numthreads == SDL_maxthreads ) {
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85 threads=(SDL_Thread **)SDL_malloc((SDL_maxthreads+ARRAY_CHUNKSIZE)*
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86 (sizeof *threads));
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87 if ( threads == NULL ) {
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88 SDL_OutOfMemory();
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89 goto done;
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90 }
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91 SDL_memcpy(threads, SDL_Threads, SDL_numthreads*(sizeof *threads));
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92 SDL_maxthreads += ARRAY_CHUNKSIZE;
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93 if ( SDL_Threads ) {
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94 SDL_free(SDL_Threads);
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95 }
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96 SDL_Threads = threads;
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97 }
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98 SDL_Threads[SDL_numthreads++] = thread;
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99 done:
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100 ReleaseSemaphore(&thread_lock);
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101 }
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102
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103 static void SDL_DelThread(SDL_Thread *thread)
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104 {
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105 int i;
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106
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107 if ( thread_lock_created ) {
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108 ObtainSemaphore(&thread_lock);
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109 for ( i=0; i<SDL_numthreads; ++i ) {
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110 if ( thread == SDL_Threads[i] ) {
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111 break;
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112 }
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113 }
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114 if ( i < SDL_numthreads ) {
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115 --SDL_numthreads;
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116 while ( i < SDL_numthreads ) {
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117 SDL_Threads[i] = SDL_Threads[i+1];
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118 ++i;
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119 }
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120 #ifdef DEBUG_THREADS
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121 printf("Deleting thread (%d left - %d max)\n",
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122 SDL_numthreads, SDL_maxthreads);
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123 #endif
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124 }
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125 ReleaseSemaphore(&thread_lock);
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126 }
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127 }
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128
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129 /* The default (non-thread-safe) global error variable */
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130 static SDL_error SDL_global_error;
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131
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132 /* Routine to get the thread-specific error variable */
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133 SDL_error *SDL_GetErrBuf(void)
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134 {
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135 SDL_error *errbuf;
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136
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137 errbuf = &SDL_global_error;
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138 if ( SDL_Threads ) {
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139 int i;
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140 Uint32 this_thread;
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141
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142 this_thread = SDL_ThreadID();
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143 ObtainSemaphore(&thread_lock);
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144 for ( i=0; i<SDL_numthreads; ++i ) {
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145 if ( this_thread == SDL_Threads[i]->threadid ) {
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146 errbuf = &SDL_Threads[i]->errbuf;
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147 break;
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148 }
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149 }
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150 ReleaseSemaphore(&thread_lock);
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151 }
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152 return(errbuf);
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153 }
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154
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155
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156 /* Arguments and callback to setup and run the user thread function */
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157 typedef struct {
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158 int (*func)(void *);
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159 void *data;
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160 SDL_Thread *info;
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161 struct Task *wait;
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162 } thread_args;
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163
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164 void SDL_RunThread(void *data)
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165 {
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166 thread_args *args;
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167 int (*userfunc)(void *);
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168 void *userdata;
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169 int *statusloc;
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170
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171 /* Perform any system-dependent setup
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172 - this function cannot fail, and cannot use SDL_SetError()
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173 */
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174 SDL_SYS_SetupThread();
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175
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176 /* Get the thread id */
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177 args = (thread_args *)data;
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178 args->info->threadid = SDL_ThreadID();
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179
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180 /* Figure out what function to run */
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181 userfunc = args->func;
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182 userdata = args->data;
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183 statusloc = &args->info->status;
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184
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185 /* Wake up the parent thread */
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186 Signal(args->wait,SIGBREAKF_CTRL_E);
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187
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188 /* Run the function */
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189 *statusloc = userfunc(userdata);
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190 }
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191
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192 SDL_Thread *SDL_CreateThread(int (*fn)(void *), void *data)
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193 {
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194 SDL_Thread *thread;
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195 thread_args *args;
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196 int ret;
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197
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198 /* Allocate memory for the thread info structure */
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199 thread = (SDL_Thread *)SDL_malloc(sizeof(*thread));
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200 if ( thread == NULL ) {
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201 SDL_OutOfMemory();
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202 return(NULL);
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203 }
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204 SDL_memset(thread, 0, (sizeof *thread));
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205 thread->status = -1;
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206
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207 /* Set up the arguments for the thread */
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208 args = (thread_args *)SDL_malloc(sizeof(*args));
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209 if ( args == NULL ) {
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210 SDL_OutOfMemory();
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211 SDL_free(thread);
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212 return(NULL);
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213 }
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214 args->func = fn;
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215 args->data = data;
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216 args->info = thread;
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217 args->wait = FindTask(NULL);
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218 if ( args->wait == NULL ) {
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219 SDL_free(thread);
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220 SDL_free(args);
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221 SDL_OutOfMemory();
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222 return(NULL);
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223 }
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224
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225 /* Add the thread to the list of available threads */
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226 SDL_AddThread(thread);
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227
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228 D(bug("Starting thread...\n"));
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229
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230 /* Create the thread and go! */
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231 ret = SDL_SYS_CreateThread(thread, args);
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232 if ( ret >= 0 ) {
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233 D(bug("Waiting for thread CTRL_E...\n"));
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234 /* Wait for the thread function to use arguments */
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235 Wait(SIGBREAKF_CTRL_E);
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236 D(bug(" Arrived."));
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237 } else {
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238 /* Oops, failed. Gotta free everything */
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239 SDL_DelThread(thread);
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240 SDL_free(thread);
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241 thread = NULL;
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242 }
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243 SDL_free(args);
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244
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245 /* Everything is running now */
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246 return(thread);
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247 }
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248
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249 void SDL_WaitThread(SDL_Thread *thread, int *status)
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250 {
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251 if ( thread ) {
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252 SDL_SYS_WaitThread(thread);
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253 if ( status ) {
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254 *status = thread->status;
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255 }
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256 SDL_DelThread(thread);
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257 SDL_free(thread);
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258 }
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259 }
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260
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261 Uint32 SDL_GetThreadID(SDL_Thread *thread)
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262 {
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263 Uint32 id;
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264
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265 if ( thread ) {
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266 id = thread->threadid;
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267 } else {
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268 id = SDL_ThreadID();
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269 }
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270 return(id);
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271 }
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272
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273 void SDL_KillThread(SDL_Thread *thread)
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274 {
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275 if ( thread ) {
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276 SDL_SYS_KillThread(thread);
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277 SDL_WaitThread(thread, NULL);
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278 }
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279 }
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280