annotate src/thread/SDL_thread.c @ 1336:3692456e7b0f

Use SDL_ prefixed versions of C library functions. FIXME: Change #include <stdlib.h> to #include "SDL_stdlib.h" Change #include <string.h> to #include "SDL_string.h" Make sure nothing else broke because of this...
author Sam Lantinga <slouken@libsdl.org>
date Tue, 07 Feb 2006 06:59:48 +0000
parents 450721ad5436
children 604d73db6802
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
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23 /* System independent thread management routines for SDL */
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24
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25 #include "SDL_error.h"
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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_stdlib.h"
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29 #include "SDL_string.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 SDL_mutex *thread_lock = NULL;
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42 int _creating_thread_lock = 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 int retval;
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47
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48 retval = 0;
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49 /* Set the thread lock creation flag so that we can reuse an
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50 existing lock on the system - since this mutex never gets
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51 destroyed (see SDL_ThreadsQuit()), we want to reuse it.
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52 */
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53 _creating_thread_lock = 1;
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54 thread_lock = SDL_CreateMutex();
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55 _creating_thread_lock = 0;
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56 if ( thread_lock == NULL ) {
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57 retval = -1;
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58 }
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59 return(retval);
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60 }
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61
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62 /* This should never be called...
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63 If this is called by SDL_Quit(), we don't know whether or not we should
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64 clean up threads here. If any threads are still running after this call,
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65 they will no longer have access to any per-thread data.
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66 */
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67 void SDL_ThreadsQuit()
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68 {
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69 SDL_mutex *mutex;
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70
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71 mutex = thread_lock;
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72 thread_lock = NULL;
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73 if ( mutex != NULL ) {
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74 SDL_DestroyMutex(mutex);
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75 }
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76 }
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77
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78 /* Routines for manipulating the thread list */
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79 static void SDL_AddThread(SDL_Thread *thread)
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80 {
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81 SDL_Thread **threads;
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82
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83 /* WARNING:
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84 If the very first threads are created simultaneously, then
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85 there could be a race condition causing memory corruption.
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86 In practice, this isn't a problem because by definition there
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87 is only one thread running the first time this is called.
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88 */
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89 if ( thread_lock == NULL ) {
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90 if ( SDL_ThreadsInit() < 0 ) {
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91 return;
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92 }
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93 }
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94 SDL_mutexP(thread_lock);
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95
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96 /* Expand the list of threads, if necessary */
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97 #ifdef DEBUG_THREADS
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98 printf("Adding thread (%d already - %d max)\n",
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99 SDL_numthreads, SDL_maxthreads);
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100 #endif
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101 if ( SDL_numthreads == SDL_maxthreads ) {
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102 threads=(SDL_Thread **)SDL_malloc((SDL_maxthreads+ARRAY_CHUNKSIZE)*
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103 (sizeof *threads));
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104 if ( threads == NULL ) {
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105 SDL_OutOfMemory();
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106 goto done;
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107 }
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108 SDL_memcpy(threads, SDL_Threads, SDL_numthreads*(sizeof *threads));
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109 SDL_maxthreads += ARRAY_CHUNKSIZE;
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110 if ( SDL_Threads ) {
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111 SDL_free(SDL_Threads);
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112 }
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113 SDL_Threads = threads;
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114 }
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115 SDL_Threads[SDL_numthreads++] = thread;
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116 done:
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117 SDL_mutexV(thread_lock);
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118 }
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119
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120 static void SDL_DelThread(SDL_Thread *thread)
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121 {
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122 int i;
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123
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124 if ( thread_lock ) {
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125 SDL_mutexP(thread_lock);
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126 for ( i=0; i<SDL_numthreads; ++i ) {
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127 if ( thread == SDL_Threads[i] ) {
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128 break;
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129 }
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130 }
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131 if ( i < SDL_numthreads ) {
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132 if ( --SDL_numthreads > 0 ) {
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133 while ( i < SDL_numthreads ) {
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134 SDL_Threads[i] = SDL_Threads[i+1];
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135 ++i;
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136 }
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137 } else {
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138 SDL_maxthreads = 0;
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139 SDL_free(SDL_Threads);
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140 SDL_Threads = NULL;
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141 }
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142 #ifdef DEBUG_THREADS
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143 printf("Deleting thread (%d left - %d max)\n",
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144 SDL_numthreads, SDL_maxthreads);
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145 #endif
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146 }
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147 SDL_mutexV(thread_lock);
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148 }
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149 }
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150
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151 /* The default (non-thread-safe) global error variable */
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152 static SDL_error SDL_global_error;
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153
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154 /* Routine to get the thread-specific error variable */
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155 SDL_error *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 Uint32 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);
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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 int (*func)(void *);
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181 void *data;
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182 SDL_Thread *info;
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183 SDL_sem *wait;
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184 } thread_args;
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185
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186 void SDL_RunThread(void *data)
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187 {
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188 thread_args *args;
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189 int (*userfunc)(void *);
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190 void *userdata;
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191 int *statusloc;
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192
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193 /* Perform any system-dependent setup
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194 - this function cannot fail, and cannot use SDL_SetError()
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195 */
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196 SDL_SYS_SetupThread();
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197
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198 /* Get the thread id */
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199 args = (thread_args *)data;
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200 args->info->threadid = SDL_ThreadID();
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201
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202 /* Figure out what function to run */
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203 userfunc = args->func;
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204 userdata = args->data;
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205 statusloc = &args->info->status;
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206
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207 /* Wake up the parent thread */
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208 SDL_SemPost(args->wait);
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209
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210 /* Run the function */
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211 *statusloc = userfunc(userdata);
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212 }
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213
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214 #if defined(_WIN32) || defined(__OS2__)
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215 #undef SDL_CreateThread
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216 DECLSPEC SDL_Thread * SDLCALL SDL_CreateThread(int (*fn)(void *), void *data, pfnSDL_CurrentBeginThread pfnBeginThread, pfnSDL_CurrentEndThread pfnEndThread)
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217 #else
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218 DECLSPEC SDL_Thread * SDLCALL SDL_CreateThread(int (*fn)(void *), void *data)
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219 #endif
0
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220 {
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221 SDL_Thread *thread;
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222 thread_args *args;
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223 int ret;
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224
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225 /* Allocate memory for the thread info structure */
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226 thread = (SDL_Thread *)SDL_malloc(sizeof(*thread));
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227 if ( thread == NULL ) {
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228 SDL_OutOfMemory();
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229 return(NULL);
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230 }
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231 SDL_memset(thread, 0, (sizeof *thread));
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232 thread->status = -1;
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233
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234 /* Set up the arguments for the thread */
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235 args = (thread_args *)SDL_malloc(sizeof(*args));
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236 if ( args == NULL ) {
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237 SDL_OutOfMemory();
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238 SDL_free(thread);
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239 return(NULL);
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240 }
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241 args->func = fn;
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242 args->data = data;
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243 args->info = thread;
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244 args->wait = SDL_CreateSemaphore(0);
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245 if ( args->wait == NULL ) {
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246 SDL_free(thread);
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247 SDL_free(args);
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248 return(NULL);
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249 }
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250
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251 /* Add the thread to the list of available threads */
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252 SDL_AddThread(thread);
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253
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254 /* Create the thread and go! */
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255 #if defined(_WIN32) || defined(__OS2__)
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256 ret = SDL_SYS_CreateThread(thread, args, pfnBeginThread, pfnEndThread);
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257 #else
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258 ret = SDL_SYS_CreateThread(thread, args);
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259 #endif
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260 if ( ret >= 0 ) {
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261 /* Wait for the thread function to use arguments */
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262 SDL_SemWait(args->wait);
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263 } else {
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264 /* Oops, failed. Gotta free everything */
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265 SDL_DelThread(thread);
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266 SDL_free(thread);
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267 thread = NULL;
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268 }
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269 SDL_DestroySemaphore(args->wait);
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270 SDL_free(args);
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271
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272 /* Everything is running now */
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273 return(thread);
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274 }
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275
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276 void SDL_WaitThread(SDL_Thread *thread, int *status)
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277 {
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278 if ( thread ) {
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279 SDL_SYS_WaitThread(thread);
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280 if ( status ) {
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281 *status = thread->status;
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282 }
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283 SDL_DelThread(thread);
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284 SDL_free(thread);
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285 }
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286 }
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287
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288 Uint32 SDL_GetThreadID(SDL_Thread *thread)
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289 {
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290 Uint32 id;
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291
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292 if ( thread ) {
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293 id = thread->threadid;
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294 } else {
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295 id = SDL_ThreadID();
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296 }
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297 return(id);
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298 }
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299
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300 void SDL_KillThread(SDL_Thread *thread)
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301 {
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302 if ( thread ) {
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303 SDL_SYS_KillThread(thread);
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304 SDL_WaitThread(thread, NULL);
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305 }
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306 }
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307