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annotate src/thread/SDL_thread.c @ 4573:6399178be313

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Completed work on X11_CreateTexture. Added lots of safety features. These include support for drawing a texture using the core protocol while other textures are drawn using Xrender if Xrender does not support the color format of the said texture or any other fault with Xrender.
author Sunny Sachanandani <sunnysachanandani@gmail.com>
date Fri, 28 May 2010 20:40:09 +0530
parents f7b03b6838cb
children 82f357a91d43
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 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
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42 SDL_ThreadsInit(void)
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43 {
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44 int retval;
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45
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46 retval = 0;
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47 thread_lock = SDL_CreateMutex();
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48 if (thread_lock == NULL) {
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49 retval = -1;
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50 }
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51 return (retval);
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52 }
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53
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54 /* This should never be called...
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55 If this is called by SDL_Quit(), we don't know whether or not we should
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56 clean up threads here. If any threads are still running after this call,
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57 they will no longer have access to any per-thread data.
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58 */
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59 void
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60 SDL_ThreadsQuit(void)
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61 {
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62 SDL_mutex *mutex;
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63
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64 mutex = thread_lock;
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65 thread_lock = NULL;
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66 if (mutex != NULL) {
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67 SDL_DestroyMutex(mutex);
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68 }
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69 }
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70
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71 /* Routines for manipulating the thread list */
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72 static void
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73 SDL_AddThread(SDL_Thread * thread)
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74 {
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75 /* WARNING:
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76 If the very first threads are created simultaneously, then
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77 there could be a race condition causing memory corruption.
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78 In practice, this isn't a problem because by definition there
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79 is only one thread running the first time this is called.
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80 */
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81 if (!thread_lock) {
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82 if (SDL_ThreadsInit() < 0) {
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83 return;
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84 }
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85 }
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86 SDL_mutexP(thread_lock);
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87
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88 /* Expand the list of threads, if necessary */
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89 #ifdef DEBUG_THREADS
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90 printf("Adding thread (%d already - %d max)\n",
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91 SDL_numthreads, SDL_maxthreads);
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92 #endif
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93 if (SDL_numthreads == SDL_maxthreads) {
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94 SDL_Thread **threads;
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95 threads = (SDL_Thread **) SDL_realloc(SDL_Threads,
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96 (SDL_maxthreads +
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97 ARRAY_CHUNKSIZE) *
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98 (sizeof *threads));
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99 if (threads == NULL) {
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100 SDL_OutOfMemory();
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101 goto done;
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102 }
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103 SDL_maxthreads += ARRAY_CHUNKSIZE;
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104 SDL_Threads = threads;
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105 }
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106 SDL_Threads[SDL_numthreads++] = thread;
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107 done:
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108 SDL_mutexV(thread_lock);
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109 }
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110
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111 static void
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112 SDL_DelThread(SDL_Thread * thread)
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113 {
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114 int i;
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115
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116 if (!thread_lock) {
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117 return;
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118 }
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119 SDL_mutexP(thread_lock);
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120 for (i = 0; i < SDL_numthreads; ++i) {
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121 if (thread == SDL_Threads[i]) {
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122 break;
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123 }
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124 }
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125 if (i < SDL_numthreads) {
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126 if (--SDL_numthreads > 0) {
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127 while (i < SDL_numthreads) {
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128 SDL_Threads[i] = SDL_Threads[i + 1];
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129 ++i;
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130 }
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131 } else {
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132 SDL_maxthreads = 0;
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133 SDL_free(SDL_Threads);
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134 SDL_Threads = NULL;
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135 }
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136 #ifdef DEBUG_THREADS
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137 printf("Deleting thread (%d left - %d max)\n",
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138 SDL_numthreads, SDL_maxthreads);
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139 #endif
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140 }
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141 SDL_mutexV(thread_lock);
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142
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34a4a01da79c Possibly fixed bug #601, definitely fixed a potential issue with threads
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143 #if 0 /* There could be memory corruption if another thread is starting */
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144 if (SDL_Threads == NULL) {
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145 SDL_ThreadsQuit();
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146 }
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147 #endif
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148 }
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149
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150 /* The default (non-thread-safe) global error variable */
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151 static SDL_error SDL_global_error;
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152
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153 /* Routine to get the thread-specific error variable */
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154 SDL_error *
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155 SDL_GetErrBuf(void)
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156 {
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157 SDL_error *errbuf;
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158
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159 errbuf = &SDL_global_error;
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160 if (SDL_Threads) {
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161 int i;
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162 SDL_threadID this_thread;
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163
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164 this_thread = SDL_ThreadID();
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165 SDL_mutexP(thread_lock);
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166 for (i = 0; i < SDL_numthreads; ++i) {
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167 if (this_thread == SDL_Threads[i]->threadid) {
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168 errbuf = &SDL_Threads[i]->errbuf;
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169 break;
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170 }
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171 }
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172 SDL_mutexV(thread_lock);
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173 }
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174 return (errbuf);
0
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175 }
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176
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177
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178 /* Arguments and callback to setup and run the user thread function */
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179 typedef struct
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180 {
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181 int (SDLCALL * func) (void *);
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182 void *data;
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183 SDL_Thread *info;
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184 SDL_sem *wait;
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185 } thread_args;
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186
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187 void
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188 SDL_RunThread(void *data)
0
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189 {
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190 thread_args *args;
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191 int (SDLCALL * userfunc) (void *);
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192 void *userdata;
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193 int *statusloc;
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194
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195 /* Perform any system-dependent setup
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196 - this function cannot fail, and cannot use SDL_SetError()
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197 */
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198 SDL_SYS_SetupThread();
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199
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200 /* Get the thread id */
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201 args = (thread_args *) data;
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202 args->info->threadid = SDL_ThreadID();
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203
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204 /* Figure out what function to run */
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205 userfunc = args->func;
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206 userdata = args->data;
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207 statusloc = &args->info->status;
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208
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209 /* Wake up the parent thread */
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210 SDL_SemPost(args->wait);
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211
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212 /* Run the function */
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213 *statusloc = userfunc(userdata);
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214 }
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215
1471
9fb0eee04dd9 Enabled libc support on Win32, so we don't break binary compatibility in 1.2
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216 #ifdef SDL_PASSED_BEGINTHREAD_ENDTHREAD
1330
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217 #undef SDL_CreateThread
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218 DECLSPEC SDL_Thread *SDLCALL
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219 SDL_CreateThread(int (SDLCALL * fn) (void *), void *data,
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220 pfnSDL_CurrentBeginThread pfnBeginThread,
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221 pfnSDL_CurrentEndThread pfnEndThread)
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222 #else
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223 DECLSPEC SDL_Thread *SDLCALL
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224 SDL_CreateThread(int (SDLCALL * fn) (void *), void *data)
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225 #endif
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226 {
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227 SDL_Thread *thread;
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228 thread_args *args;
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229 int ret;
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230
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231 /* Allocate memory for the thread info structure */
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232 thread = (SDL_Thread *) SDL_malloc(sizeof(*thread));
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233 if (thread == NULL) {
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234 SDL_OutOfMemory();
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235 return (NULL);
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236 }
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237 SDL_memset(thread, 0, (sizeof *thread));
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238 thread->status = -1;
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239
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240 /* Set up the arguments for the thread */
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241 args = (thread_args *) SDL_malloc(sizeof(*args));
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242 if (args == NULL) {
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243 SDL_OutOfMemory();
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244 SDL_free(thread);
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245 return (NULL);
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246 }
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247 args->func = fn;
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248 args->data = data;
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249 args->info = thread;
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250 args->wait = SDL_CreateSemaphore(0);
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251 if (args->wait == NULL) {
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252 SDL_free(thread);
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253 SDL_free(args);
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254 return (NULL);
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255 }
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256
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257 /* Add the thread to the list of available threads */
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258 SDL_AddThread(thread);
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259
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260 /* Create the thread and go! */
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261 #ifdef SDL_PASSED_BEGINTHREAD_ENDTHREAD
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262 ret = SDL_SYS_CreateThread(thread, args, pfnBeginThread, pfnEndThread);
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263 #else
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264 ret = SDL_SYS_CreateThread(thread, args);
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265 #endif
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266 if (ret >= 0) {
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267 /* Wait for the thread function to use arguments */
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268 SDL_SemWait(args->wait);
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269 } else {
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270 /* Oops, failed. Gotta free everything */
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271 SDL_DelThread(thread);
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272 SDL_free(thread);
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273 thread = NULL;
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274 }
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275 SDL_DestroySemaphore(args->wait);
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276 SDL_free(args);
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277
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278 /* Everything is running now */
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279 return (thread);
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280 }
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281
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282 void
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283 SDL_WaitThread(SDL_Thread * thread, int *status)
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284 {
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285 if (thread) {
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286 SDL_SYS_WaitThread(thread);
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287 if (status) {
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288 *status = thread->status;
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289 }
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290 SDL_DelThread(thread);
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291 SDL_free(thread);
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292 }
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293 }
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294
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295 SDL_threadID
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296 SDL_GetThreadID(SDL_Thread * thread)
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297 {
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298 SDL_threadID id;
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299
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300 if (thread) {
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301 id = thread->threadid;
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302 } else {
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303 id = SDL_ThreadID();
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304 }
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305 return id;
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306 }
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307
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308 void
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309 SDL_KillThread(SDL_Thread * thread)
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310 {
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311 /* This is a no-op in SDL 1.3 and later. */
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312 }
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313
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314 /* vi: set ts=4 sw=4 expandtab: */