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annotate src/thread/SDL_thread.c @ 4966:a130bc2f0a18

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Fixed return value
author Sam Lantinga <slouken@libsdl.org>
date Fri, 07 Jan 2011 09:53:08 -0800
parents 791b3256fb22
children b530ef003506
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 static 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 static 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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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)
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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
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216 #ifdef SDL_PASSED_BEGINTHREAD_ENDTHREAD
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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 /* vi: set ts=4 sw=4 expandtab: */