annotate src/thread/SDL_thread.c @ 4109:cd2ab40f1219 SDL-1.2

Made the mprotect() fix for SDL_SoftStretch() more general for hardened linux, etc.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 29 Dec 2007 05:18:33 +0000
parents 290b5baf2fca
children 782fd950bd46 c121d94672cb a1b03ba2fcd0
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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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 SDL_mutex *thread_lock = NULL;
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40
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41 int SDL_ThreadsInit(void)
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42 {
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43 int retval;
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44
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45 retval = 0;
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46 thread_lock = SDL_CreateMutex();
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47 if ( thread_lock == NULL ) {
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48 retval = -1;
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49 }
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50 return(retval);
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51 }
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52
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53 /* This should never be called...
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54 If this is called by SDL_Quit(), we don't know whether or not we should
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55 clean up threads here. If any threads are still running after this call,
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56 they will no longer have access to any per-thread data.
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57 */
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58 void SDL_ThreadsQuit(void)
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59 {
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60 SDL_mutex *mutex;
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61
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62 mutex = thread_lock;
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63 thread_lock = NULL;
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64 if ( mutex != NULL ) {
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65 SDL_DestroyMutex(mutex);
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66 }
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67 }
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68
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69 /* Routines for manipulating the thread list */
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70 static void SDL_AddThread(SDL_Thread *thread)
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71 {
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72 /* WARNING:
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73 If the very first threads are created simultaneously, then
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74 there could be a race condition causing memory corruption.
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75 In practice, this isn't a problem because by definition there
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76 is only one thread running the first time this is called.
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77 */
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78 if ( !thread_lock ) {
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79 if ( SDL_ThreadsInit() < 0 ) {
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80 return;
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81 }
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82 }
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83 SDL_mutexP(thread_lock);
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84
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85 /* Expand the list of threads, if necessary */
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86 #ifdef DEBUG_THREADS
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87 printf("Adding thread (%d already - %d max)\n",
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88 SDL_numthreads, SDL_maxthreads);
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89 #endif
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90 if ( SDL_numthreads == SDL_maxthreads ) {
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91 SDL_Thread **threads;
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92 threads = (SDL_Thread **)SDL_realloc(SDL_Threads,
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93 (SDL_maxthreads+ARRAY_CHUNKSIZE)*(sizeof *threads));
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94 if ( threads == NULL ) {
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95 SDL_OutOfMemory();
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96 goto done;
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97 }
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98 SDL_maxthreads += ARRAY_CHUNKSIZE;
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99 SDL_Threads = threads;
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100 }
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101 SDL_Threads[SDL_numthreads++] = thread;
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102 done:
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103 SDL_mutexV(thread_lock);
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104 }
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105
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106 static void 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 ) {
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111 return;
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112 }
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113 SDL_mutexP(thread_lock);
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114 for ( i=0; i<SDL_numthreads; ++i ) {
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115 if ( thread == SDL_Threads[i] ) {
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116 break;
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117 }
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118 }
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119 if ( i < SDL_numthreads ) {
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120 if ( --SDL_numthreads > 0 ) {
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121 while ( i < SDL_numthreads ) {
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122 SDL_Threads[i] = SDL_Threads[i+1];
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123 ++i;
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124 }
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125 } else {
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126 SDL_maxthreads = 0;
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127 SDL_free(SDL_Threads);
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128 SDL_Threads = NULL;
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129 }
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130 #ifdef DEBUG_THREADS
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131 printf("Deleting thread (%d left - %d max)\n",
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132 SDL_numthreads, SDL_maxthreads);
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133 #endif
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134 }
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135 SDL_mutexV(thread_lock);
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136
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137 if ( SDL_Threads == NULL ) {
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138 SDL_ThreadsQuit();
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139 }
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140 }
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141
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142 /* The default (non-thread-safe) global error variable */
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143 static SDL_error SDL_global_error;
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144
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145 /* Routine to get the thread-specific error variable */
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146 SDL_error *SDL_GetErrBuf(void)
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147 {
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148 SDL_error *errbuf;
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149
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150 errbuf = &SDL_global_error;
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151 if ( SDL_Threads ) {
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152 int i;
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153 Uint32 this_thread;
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154
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155 this_thread = SDL_ThreadID();
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156 SDL_mutexP(thread_lock);
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157 for ( i=0; i<SDL_numthreads; ++i ) {
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158 if ( this_thread == SDL_Threads[i]->threadid ) {
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159 errbuf = &SDL_Threads[i]->errbuf;
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160 break;
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161 }
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162 }
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163 SDL_mutexV(thread_lock);
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164 }
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165 return(errbuf);
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166 }
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167
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168
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169 /* Arguments and callback to setup and run the user thread function */
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170 typedef struct {
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171 int (SDLCALL *func)(void *);
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172 void *data;
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173 SDL_Thread *info;
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174 SDL_sem *wait;
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175 } thread_args;
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176
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177 void SDL_RunThread(void *data)
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178 {
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179 thread_args *args;
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180 int (SDLCALL *userfunc)(void *);
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181 void *userdata;
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182 int *statusloc;
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183
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184 /* Perform any system-dependent setup
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185 - this function cannot fail, and cannot use SDL_SetError()
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186 */
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187 SDL_SYS_SetupThread();
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188
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189 /* Get the thread id */
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190 args = (thread_args *)data;
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191 args->info->threadid = SDL_ThreadID();
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192
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193 /* Figure out what function to run */
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194 userfunc = args->func;
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195 userdata = args->data;
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196 statusloc = &args->info->status;
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197
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198 /* Wake up the parent thread */
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199 SDL_SemPost(args->wait);
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200
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201 /* Run the function */
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202 *statusloc = userfunc(userdata);
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203 }
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204
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205 #ifdef SDL_PASSED_BEGINTHREAD_ENDTHREAD
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206 #undef SDL_CreateThread
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207 DECLSPEC SDL_Thread * SDLCALL SDL_CreateThread(int (SDLCALL *fn)(void *), void *data, pfnSDL_CurrentBeginThread pfnBeginThread, pfnSDL_CurrentEndThread pfnEndThread)
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208 #else
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209 DECLSPEC SDL_Thread * SDLCALL SDL_CreateThread(int (SDLCALL *fn)(void *), void *data)
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210 #endif
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211 {
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212 SDL_Thread *thread;
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213 thread_args *args;
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214 int ret;
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215
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216 /* Allocate memory for the thread info structure */
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217 thread = (SDL_Thread *)SDL_malloc(sizeof(*thread));
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218 if ( thread == NULL ) {
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219 SDL_OutOfMemory();
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220 return(NULL);
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221 }
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222 SDL_memset(thread, 0, (sizeof *thread));
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223 thread->status = -1;
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224
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225 /* Set up the arguments for the thread */
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226 args = (thread_args *)SDL_malloc(sizeof(*args));
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227 if ( args == NULL ) {
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228 SDL_OutOfMemory();
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229 SDL_free(thread);
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230 return(NULL);
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231 }
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232 args->func = fn;
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233 args->data = data;
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234 args->info = thread;
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235 args->wait = SDL_CreateSemaphore(0);
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236 if ( args->wait == NULL ) {
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237 SDL_free(thread);
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238 SDL_free(args);
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239 return(NULL);
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240 }
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241
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242 /* Add the thread to the list of available threads */
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243 SDL_AddThread(thread);
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244
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245 /* Create the thread and go! */
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246 #ifdef SDL_PASSED_BEGINTHREAD_ENDTHREAD
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247 ret = SDL_SYS_CreateThread(thread, args, pfnBeginThread, pfnEndThread);
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248 #else
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249 ret = SDL_SYS_CreateThread(thread, args);
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250 #endif
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251 if ( ret >= 0 ) {
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252 /* Wait for the thread function to use arguments */
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253 SDL_SemWait(args->wait);
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254 } else {
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255 /* Oops, failed. Gotta free everything */
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256 SDL_DelThread(thread);
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257 SDL_free(thread);
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258 thread = NULL;
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259 }
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260 SDL_DestroySemaphore(args->wait);
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261 SDL_free(args);
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262
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263 /* Everything is running now */
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264 return(thread);
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265 }
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266
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267 void SDL_WaitThread(SDL_Thread *thread, int *status)
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268 {
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269 if ( thread ) {
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270 SDL_SYS_WaitThread(thread);
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271 if ( status ) {
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272 *status = thread->status;
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273 }
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274 SDL_DelThread(thread);
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275 SDL_free(thread);
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276 }
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277 }
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278
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279 Uint32 SDL_GetThreadID(SDL_Thread *thread)
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280 {
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281 Uint32 id;
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282
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283 if ( thread ) {
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284 id = thread->threadid;
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285 } else {
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286 id = SDL_ThreadID();
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287 }
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288 return(id);
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289 }
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290
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291 void SDL_KillThread(SDL_Thread *thread)
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292 {
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293 if ( thread ) {
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294 SDL_SYS_KillThread(thread);
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295 SDL_WaitThread(thread, NULL);
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296 }
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297 }
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298