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annotate src/thread/SDL_thread.c @ 2866:e532417a6977

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Fixed SDL 1.2 compatibility problem. The API specifies that SDL_OpenAudio() will fill out the 'desired' audio spec with the correct samples and size set by the driver. This value is important since it may be used by applications that size audio buffers, etc. However, we want to allow advanced applications to call SDL_OpenAudioDevice() which gets passed a const 'desired' parameter, and have the correct data filled into the 'obtained' parameter, possibly allowing or not allowing format changes. So... 'obtained' becomes the audio format the user callback is expected to use, and we add flags to allow the application to specify which format changes are allowed. Note: We really need to add a way to query the 'obtained' audio spec.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 13 Dec 2008 06:36:47 +0000
parents 99210400e8b9
children 34a4a01da79c
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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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143 if (SDL_Threads == NULL) {
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144 SDL_ThreadsQuit();
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145 }
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146 }
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147
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148 /* The default (non-thread-safe) global error variable */
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149 static SDL_error SDL_global_error;
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150
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151 /* Routine to get the thread-specific error variable */
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152 SDL_error *
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153 SDL_GetErrBuf(void)
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154 {
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155 SDL_error *errbuf;
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156
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157 errbuf = &SDL_global_error;
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158 if (SDL_Threads) {
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159 int i;
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160 Uint32 this_thread;
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161
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162 this_thread = SDL_ThreadID();
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163 SDL_mutexP(thread_lock);
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164 for (i = 0; i < SDL_numthreads; ++i) {
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165 if (this_thread == SDL_Threads[i]->threadid) {
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166 errbuf = &SDL_Threads[i]->errbuf;
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167 break;
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168 }
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169 }
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170 SDL_mutexV(thread_lock);
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171 }
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172 return (errbuf);
0
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173 }
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174
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175
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176 /* Arguments and callback to setup and run the user thread function */
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177 typedef struct
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178 {
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179 int (SDLCALL * func) (void *);
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180 void *data;
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181 SDL_Thread *info;
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182 SDL_sem *wait;
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183 } thread_args;
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184
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185 void
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186 SDL_RunThread(void *data)
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187 {
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188 thread_args *args;
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189 int (SDLCALL * 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 #ifdef SDL_PASSED_BEGINTHREAD_ENDTHREAD
1330
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215 #undef SDL_CreateThread
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216 DECLSPEC SDL_Thread *SDLCALL
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217 SDL_CreateThread(int (SDLCALL * fn) (void *), void *data,
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218 pfnSDL_CurrentBeginThread pfnBeginThread,
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219 pfnSDL_CurrentEndThread pfnEndThread)
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220 #else
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221 DECLSPEC SDL_Thread *SDLCALL
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222 SDL_CreateThread(int (SDLCALL * fn) (void *), void *data)
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223 #endif
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224 {
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225 SDL_Thread *thread;
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226 thread_args *args;
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227 int ret;
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228
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229 /* Allocate memory for the thread info structure */
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230 thread = (SDL_Thread *) SDL_malloc(sizeof(*thread));
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231 if (thread == NULL) {
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232 SDL_OutOfMemory();
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233 return (NULL);
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234 }
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235 SDL_memset(thread, 0, (sizeof *thread));
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236 thread->status = -1;
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237
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238 /* Set up the arguments for the thread */
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239 args = (thread_args *) SDL_malloc(sizeof(*args));
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240 if (args == NULL) {
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241 SDL_OutOfMemory();
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242 SDL_free(thread);
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243 return (NULL);
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244 }
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245 args->func = fn;
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246 args->data = data;
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247 args->info = thread;
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248 args->wait = SDL_CreateSemaphore(0);
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249 if (args->wait == NULL) {
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250 SDL_free(thread);
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251 SDL_free(args);
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252 return (NULL);
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253 }
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254
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255 /* Add the thread to the list of available threads */
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256 SDL_AddThread(thread);
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257
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258 /* Create the thread and go! */
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259 #ifdef SDL_PASSED_BEGINTHREAD_ENDTHREAD
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260 ret = SDL_SYS_CreateThread(thread, args, pfnBeginThread, pfnEndThread);
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261 #else
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262 ret = SDL_SYS_CreateThread(thread, args);
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263 #endif
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264 if (ret >= 0) {
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265 /* Wait for the thread function to use arguments */
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266 SDL_SemWait(args->wait);
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267 } else {
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268 /* Oops, failed. Gotta free everything */
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269 SDL_DelThread(thread);
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270 SDL_free(thread);
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271 thread = NULL;
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272 }
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273 SDL_DestroySemaphore(args->wait);
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274 SDL_free(args);
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275
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276 /* Everything is running now */
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277 return (thread);
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278 }
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279
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280 void
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281 SDL_WaitThread(SDL_Thread * thread, int *status)
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282 {
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283 if (thread) {
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284 SDL_SYS_WaitThread(thread);
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285 if (status) {
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286 *status = thread->status;
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287 }
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288 SDL_DelThread(thread);
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289 SDL_free(thread);
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290 }
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291 }
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292
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293 Uint32
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294 SDL_GetThreadID(SDL_Thread * thread)
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295 {
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296 Uint32 id;
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297
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298 if (thread) {
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299 id = thread->threadid;
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300 } else {
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301 id = SDL_ThreadID();
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302 }
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303 return (id);
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304 }
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305
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306 void
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307 SDL_KillThread(SDL_Thread * thread)
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308 {
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309 /* This is a no-op in SDL 1.3 and later. */
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310 }
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311
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312 /* vi: set ts=4 sw=4 expandtab: */