annotate src/thread/SDL_thread.c @ 329:1d74ddc90cb2

Patrice's fixes for GNU Pthread support
author Sam Lantinga <slouken@libsdl.org>
date Mon, 01 Apr 2002 15:35:28 +0000
parents f6ffac90895c
children b9f1ce709960
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, 1998, 1999, 2000, 2001, 2002 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /* System independent thread management routines for SDL */
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29
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30 #include <stdio.h>
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31 #include <stdlib.h>
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32 #include <string.h>
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33
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34 #include "SDL_error.h"
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35 #include "SDL_mutex.h"
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36 #include "SDL_thread.h"
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37 #include "SDL_thread_c.h"
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38 #include "SDL_systhread.h"
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39
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40 #define ARRAY_CHUNKSIZE 32
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41 /* The array of threads currently active in the application
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42 (except the main thread)
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43 The manipulation of an array here is safer than using a linked list.
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44 */
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45 static int SDL_maxthreads = 0;
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46 static int SDL_numthreads = 0;
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47 static SDL_Thread **SDL_Threads = NULL;
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48 static SDL_mutex *thread_lock = NULL;
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49 int _creating_thread_lock = 0;
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50
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51 int SDL_ThreadsInit(void)
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52 {
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53 int retval;
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54
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55 #ifdef ENABLE_PTH
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56 if (!pth_init()) {
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57 return -1;
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58 }
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59 #endif
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60
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61 retval = 0;
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62 /* Set the thread lock creation flag so that we can reuse an
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63 existing lock on the system - since this mutex never gets
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64 destroyed (see SDL_ThreadsQuit()), we want to reuse it.
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65 */
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66 _creating_thread_lock = 1;
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67 thread_lock = SDL_CreateMutex();
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68 _creating_thread_lock = 0;
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69 if ( thread_lock == NULL ) {
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70 retval = -1;
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71 }
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72 return(retval);
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73 }
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74
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75 /* This should never be called...
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76 If this is called by SDL_Quit(), we don't know whether or not we should
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77 clean up threads here. If any threads are still running after this call,
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78 they will no longer have access to any per-thread data.
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79 */
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80 void SDL_ThreadsQuit()
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81 {
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82 SDL_mutex *mutex;
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83
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84 mutex = thread_lock;
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85 thread_lock = NULL;
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86 if ( mutex != NULL ) {
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87 SDL_DestroyMutex(mutex);
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88 }
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89
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90 #ifdef ENABLE_PTH
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91 pth_kill();
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92 #endif
0
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93 }
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94
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95 /* Routines for manipulating the thread list */
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96 static void SDL_AddThread(SDL_Thread *thread)
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97 {
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98 SDL_Thread **threads;
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99
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100 /* WARNING:
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101 If the very first threads are created simultaneously, then
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102 there could be a race condition causing memory corruption.
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103 In practice, this isn't a problem because by definition there
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104 is only one thread running the first time this is called.
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105 */
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106 if ( thread_lock == NULL ) {
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107 if ( SDL_ThreadsInit() < 0 ) {
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108 return;
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109 }
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110 }
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111 SDL_mutexP(thread_lock);
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112
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113 /* Expand the list of threads, if necessary */
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114 #ifdef DEBUG_THREADS
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115 printf("Adding thread (%d already - %d max)\n",
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116 SDL_numthreads, SDL_maxthreads);
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117 #endif
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118 if ( SDL_numthreads == SDL_maxthreads ) {
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119 threads=(SDL_Thread **)malloc((SDL_maxthreads+ARRAY_CHUNKSIZE)*
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120 (sizeof *threads));
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121 if ( threads == NULL ) {
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122 SDL_OutOfMemory();
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123 goto done;
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124 }
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125 memcpy(threads, SDL_Threads, SDL_numthreads*(sizeof *threads));
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126 SDL_maxthreads += ARRAY_CHUNKSIZE;
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127 if ( SDL_Threads ) {
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128 free(SDL_Threads);
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129 }
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130 SDL_Threads = threads;
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131 }
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132 SDL_Threads[SDL_numthreads++] = thread;
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133 done:
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134 SDL_mutexV(thread_lock);
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135 }
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136
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137 static void SDL_DelThread(SDL_Thread *thread)
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138 {
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139 int i;
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140
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141 if ( thread_lock ) {
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142 SDL_mutexP(thread_lock);
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143 for ( i=0; i<SDL_numthreads; ++i ) {
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144 if ( thread == SDL_Threads[i] ) {
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145 break;
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146 }
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147 }
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148 if ( i < SDL_numthreads ) {
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149 --SDL_numthreads;
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150 while ( i < SDL_numthreads ) {
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151 SDL_Threads[i] = SDL_Threads[i+1];
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152 ++i;
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153 }
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154 #ifdef DEBUG_THREADS
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155 printf("Deleting thread (%d left - %d max)\n",
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156 SDL_numthreads, SDL_maxthreads);
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157 #endif
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158 }
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159 SDL_mutexV(thread_lock);
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160 }
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161 }
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162
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163 /* The default (non-thread-safe) global error variable */
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164 static SDL_error SDL_global_error;
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165
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166 /* Routine to get the thread-specific error variable */
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167 SDL_error *SDL_GetErrBuf(void)
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168 {
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169 SDL_error *errbuf;
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170
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171 errbuf = &SDL_global_error;
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172 if ( SDL_Threads ) {
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173 int i;
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174 Uint32 this_thread;
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175
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176 this_thread = SDL_ThreadID();
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177 SDL_mutexP(thread_lock);
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178 for ( i=0; i<SDL_numthreads; ++i ) {
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179 if ( this_thread == SDL_Threads[i]->threadid ) {
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180 errbuf = &SDL_Threads[i]->errbuf;
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181 break;
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182 }
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183 }
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184 SDL_mutexV(thread_lock);
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185 }
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186 return(errbuf);
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187 }
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188
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189
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190 /* Arguments and callback to setup and run the user thread function */
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191 typedef struct {
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192 int (*func)(void *);
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193 void *data;
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194 SDL_Thread *info;
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195 SDL_sem *wait;
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196 } thread_args;
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197
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198 void SDL_RunThread(void *data)
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199 {
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200 thread_args *args;
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201 int (*userfunc)(void *);
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202 void *userdata;
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203 int *statusloc;
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204
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205 /* Perform any system-dependent setup
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206 - this function cannot fail, and cannot use SDL_SetError()
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207 */
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208 SDL_SYS_SetupThread();
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209
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210 /* Get the thread id */
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211 args = (thread_args *)data;
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212 args->info->threadid = SDL_ThreadID();
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213
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214 /* Figure out what function to run */
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215 userfunc = args->func;
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216 userdata = args->data;
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217 statusloc = &args->info->status;
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218
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219 /* Wake up the parent thread */
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220 SDL_SemPost(args->wait);
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221
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222 /* Run the function */
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223 *statusloc = userfunc(userdata);
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224 }
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225
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226 SDL_Thread *SDL_CreateThread(int (*fn)(void *), void *data)
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227 {
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228 SDL_Thread *thread;
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229 thread_args *args;
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230 int ret;
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231
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232 /* Allocate memory for the thread info structure */
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233 thread = (SDL_Thread *)malloc(sizeof(*thread));
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234 if ( thread == NULL ) {
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235 SDL_OutOfMemory();
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236 return(NULL);
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237 }
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238 memset(thread, 0, (sizeof *thread));
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239 thread->status = -1;
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240
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241 /* Set up the arguments for the thread */
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242 args = (thread_args *)malloc(sizeof(*args));
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243 if ( args == NULL ) {
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244 SDL_OutOfMemory();
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245 free(thread);
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246 return(NULL);
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247 }
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248 args->func = fn;
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249 args->data = data;
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250 args->info = thread;
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251 args->wait = SDL_CreateSemaphore(0);
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252 if ( args->wait == NULL ) {
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253 free(thread);
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254 free(args);
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255 return(NULL);
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256 }
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257
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258 /* Add the thread to the list of available threads */
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259 SDL_AddThread(thread);
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260
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261 /* Create the thread and go! */
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262 ret = SDL_SYS_CreateThread(thread, args);
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263 if ( ret >= 0 ) {
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264 /* Wait for the thread function to use arguments */
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265 SDL_SemWait(args->wait);
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266 } else {
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267 /* Oops, failed. Gotta free everything */
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268 SDL_DelThread(thread);
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269 free(thread);
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270 thread = NULL;
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271 }
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272 SDL_DestroySemaphore(args->wait);
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273 free(args);
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274
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275 /* Everything is running now */
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276 return(thread);
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277 }
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278
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279 void SDL_WaitThread(SDL_Thread *thread, int *status)
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280 {
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281 if ( thread ) {
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282 SDL_SYS_WaitThread(thread);
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283 if ( status ) {
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284 *status = thread->status;
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285 }
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286 SDL_DelThread(thread);
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287 free(thread);
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288 }
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289 }
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290
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291 Uint32 SDL_GetThreadID(SDL_Thread *thread)
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292 {
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293 Uint32 id;
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294
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295 if ( thread ) {
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296 id = thread->threadid;
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297 } else {
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298 id = SDL_ThreadID();
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diff changeset
299 }
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300 return(id);
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301 }
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302
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diff changeset
303 void SDL_KillThread(SDL_Thread *thread)
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diff changeset
304 {
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diff changeset
305 if ( thread ) {
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306 SDL_SYS_KillThread(thread);
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diff changeset
307 SDL_WaitThread(thread, NULL);
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diff changeset
308 }
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diff changeset
309 }
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parents:
diff changeset
310