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1 <HTML
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2 ><HEAD
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3 ><TITLE
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4 >Multi-threaded Programming</TITLE
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5 ><META
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6 NAME="GENERATOR"
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7 CONTENT="Modular DocBook HTML Stylesheet Version 1.61
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8 "><LINK
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9 REL="HOME"
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10 TITLE="SDL Library Documentation"
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11 HREF="index.html"><LINK
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12 REL="UP"
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13 TITLE="SDL Reference"
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14 HREF="reference.html"><LINK
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15 REL="PREVIOUS"
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16 TITLE="SDL_CDtrack"
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17 HREF="sdlcdtrack.html"><LINK
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18 REL="NEXT"
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19 TITLE="SDL_CreateThread"
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20 HREF="sdlcreatethread.html"><META
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21 NAME="KEYWORD"
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22 CONTENT="threads"><META
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23 NAME="KEYWORD"
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24 CONTENT="function"></HEAD
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25 ><BODY
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26 CLASS="CHAPTER"
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27 BGCOLOR="#FFF8DC"
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28 TEXT="#000000"
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29 LINK="#0000ee"
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30 VLINK="#551a8b"
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31 ALINK="#ff0000"
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32 ><DIV
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33 CLASS="NAVHEADER"
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34 ><TABLE
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35 WIDTH="100%"
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36 BORDER="0"
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37 CELLPADDING="0"
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38 CELLSPACING="0"
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39 ><TR
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40 ><TH
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41 COLSPAN="3"
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42 ALIGN="center"
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43 >SDL Library Documentation</TH
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44 ></TR
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45 ><TR
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46 ><TD
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47 WIDTH="10%"
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48 ALIGN="left"
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49 VALIGN="bottom"
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50 ><A
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51 HREF="sdlcdtrack.html"
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52 >Prev</A
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53 ></TD
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54 ><TD
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55 WIDTH="80%"
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56 ALIGN="center"
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57 VALIGN="bottom"
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58 ></TD
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59 ><TD
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60 WIDTH="10%"
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61 ALIGN="right"
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62 VALIGN="bottom"
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63 ><A
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64 HREF="sdlcreatethread.html"
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65 >Next</A
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66 ></TD
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67 ></TR
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68 ></TABLE
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69 ><HR
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70 ALIGN="LEFT"
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71 WIDTH="100%"></DIV
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72 ><DIV
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73 CLASS="CHAPTER"
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74 ><H1
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75 ><A
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76 NAME="THREAD"
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77 >Chapter 12. Multi-threaded Programming</A
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78 ></H1
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79 ><DIV
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80 CLASS="TOC"
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81 ><DL
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82 ><DT
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83 ><B
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84 >Table of Contents</B
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85 ></DT
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86 ><DT
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87 ><A
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88 HREF="sdlcreatethread.html"
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89 >SDL_CreateThread</A
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90 > — Creates a new thread of execution that shares its parent's properties.</DT
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91 ><DT
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92 ><A
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93 HREF="sdlthreadid.html"
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94 >SDL_ThreadID</A
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95 > — Get the 32-bit thread identifier for the current thread.</DT
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96 ><DT
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97 ><A
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98 HREF="sdlgetthreadid.html"
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99 >SDL_GetThreadID</A
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100 > — Get the SDL thread ID of a SDL_Thread</DT
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101 ><DT
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102 ><A
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103 HREF="sdlwaitthread.html"
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104 >SDL_WaitThread</A
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105 > — Wait for a thread to finish.</DT
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106 ><DT
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107 ><A
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108 HREF="sdlkillthread.html"
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109 >SDL_KillThread</A
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110 > — Gracelessly terminates the thread.</DT
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111 ><DT
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112 ><A
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113 HREF="sdlcreatemutex.html"
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114 >SDL_CreateMutex</A
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115 > — Create a mutex</DT
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116 ><DT
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117 ><A
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118 HREF="sdldestroymutex.html"
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119 >SDL_DestroyMutex</A
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120 > — Destroy a mutex</DT
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121 ><DT
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122 ><A
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123 HREF="sdlmutexp.html"
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124 >SDL_mutexP</A
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125 > — Lock a mutex</DT
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126 ><DT
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127 ><A
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128 HREF="sdlmutexv.html"
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129 >SDL_mutexV</A
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130 > — Unlock a mutex</DT
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131 ><DT
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132 ><A
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133 HREF="sdlcreatesemaphore.html"
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134 >SDL_CreateSemaphore</A
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135 > — Creates a new semaphore and assigns an initial value to it.</DT
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136 ><DT
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137 ><A
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138 HREF="sdldestroysemaphore.html"
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139 >SDL_DestroySemaphore</A
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140 > — Destroys a semaphore that was created by <A
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141 HREF="sdlcreatesemaphore.html"
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142 >SDL_CreateSemaphore</A
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143 >.</DT
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144 ><DT
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145 ><A
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146 HREF="sdlsemwait.html"
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147 >SDL_SemWait</A
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148 > — Lock a semaphore and suspend the thread if the semaphore value is zero.</DT
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149 ><DT
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150 ><A
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151 HREF="sdlsemtrywait.html"
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152 >SDL_SemTryWait</A
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153 > — Attempt to lock a semaphore but don't suspend the thread.</DT
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154 ><DT
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155 ><A
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156 HREF="sdlsemwaittimeout.html"
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157 >SDL_SemWaitTimeout</A
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158 > — Lock a semaphore, but only wait up to a specified maximum time.</DT
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159 ><DT
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160 ><A
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161 HREF="sdlsempost.html"
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162 >SDL_SemPost</A
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163 > — Unlock a semaphore.</DT
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164 ><DT
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165 ><A
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166 HREF="sdlsemvalue.html"
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167 >SDL_SemValue</A
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168 > — Return the current value of a semaphore.</DT
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169 ><DT
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170 ><A
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171 HREF="sdlcreatecond.html"
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172 >SDL_CreateCond</A
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173 > — Create a condition variable</DT
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174 ><DT
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175 ><A
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176 HREF="sdldestroycond.html"
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177 >SDL_DestroyCond</A
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178 > — Destroy a condition variable</DT
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179 ><DT
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180 ><A
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181 HREF="sdlcondsignal.html"
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182 >SDL_CondSignal</A
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183 > — Restart a thread wait on a condition variable</DT
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184 ><DT
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185 ><A
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186 HREF="sdlcondbroadcast.html"
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187 >SDL_CondBroadcast</A
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188 > — Restart all threads waiting on a condition variable</DT
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189 ><DT
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190 ><A
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191 HREF="sdlcondwait.html"
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192 >SDL_CondWait</A
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193 > — Wait on a condition variable</DT
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194 ><DT
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195 ><A
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196 HREF="sdlcondwaittimeout.html"
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197 >SDL_CondWaitTimeout</A
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198 > — Wait on a condition variable, with timeout</DT
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199 ></DL
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200 ></DIV
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201 ><P
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202 >SDL provides functions for creating threads, mutexes, semphores and condition variables.</P
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203 ><P
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204 >In general, you must be very aware of concurrency and data integrity issues
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205 when writing multi-threaded programs. Some good guidelines include:
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206 <P
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207 ></P
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208 ><UL
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209 ><LI
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210 ><P
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211 >Don't call SDL video/event functions from separate threads</P
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212 ></LI
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213 ><LI
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214 ><P
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215 >Don't use any library functions in separate threads</P
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216 ></LI
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217 ><LI
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218 ><P
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219 >Don't perform any memory management in separate threads</P
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220 ></LI
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221 ><LI
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222 ><P
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223 >Lock global variables which may be accessed by multiple threads</P
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224 ></LI
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225 ><LI
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226 ><P
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227 >Never terminate threads, always set a flag and wait for them to quit</P
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228 ></LI
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229 ><LI
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230 ><P
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231 >Think very carefully about all possible ways your code may interact</P
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232 ></LI
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233 ></UL
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234 ></P
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235 ><DIV
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236 CLASS="NOTE"
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237 ><BLOCKQUOTE
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238 CLASS="NOTE"
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239 ><P
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240 ><B
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241 >Note: </B
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242 >SDL's threading is not implemented on MacOS, due to that lack of preemptive thread support (eck!)</P
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243 ></BLOCKQUOTE
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244 ></DIV
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245 ></DIV
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246 ><DIV
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247 CLASS="NAVFOOTER"
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248 ><HR
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249 ALIGN="LEFT"
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250 WIDTH="100%"><TABLE
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251 WIDTH="100%"
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252 BORDER="0"
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253 CELLPADDING="0"
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254 CELLSPACING="0"
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255 ><TR
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256 ><TD
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257 WIDTH="33%"
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258 ALIGN="left"
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259 VALIGN="top"
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260 ><A
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261 HREF="sdlcdtrack.html"
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262 >Prev</A
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263 ></TD
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264 ><TD
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265 WIDTH="34%"
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266 ALIGN="center"
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267 VALIGN="top"
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268 ><A
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269 HREF="index.html"
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270 >Home</A
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271 ></TD
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272 ><TD
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273 WIDTH="33%"
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274 ALIGN="right"
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275 VALIGN="top"
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276 ><A
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277 HREF="sdlcreatethread.html"
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278 >Next</A
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279 ></TD
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280 ></TR
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281 ><TR
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282 ><TD
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283 WIDTH="33%"
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284 ALIGN="left"
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285 VALIGN="top"
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286 >SDL_CDtrack</TD
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287 ><TD
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288 WIDTH="34%"
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289 ALIGN="center"
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290 VALIGN="top"
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291 ><A
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292 HREF="reference.html"
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293 >Up</A
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294 ></TD
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295 ><TD
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296 WIDTH="33%"
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297 ALIGN="right"
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298 VALIGN="top"
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299 >SDL_CreateThread</TD
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300 ></TR
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301 ></TABLE
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302 ></DIV
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303 ></BODY
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304 ></HTML
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305 > |
