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Solved the performance problems by introducing the concept of a single-buffered display, which is a fast path used for the whole-surface SDL 1.2 API. Solved the flicker problems by implementing a backbuffer in the GDI renderer. Unfortunately, now using the GDI renderer with a backbuffer and HBITMAPs is significantly slower than SDL's surface code. *sigh*
author Sam Lantinga <slouken@libsdl.org>
date Wed, 12 Jul 2006 06:39:26 +0000
parents f12379c41042
children
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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 1.76b+
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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 SUMMARY="Header navigation table"
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36 WIDTH="100%"
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37 BORDER="0"
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38 CELLPADDING="0"
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39 CELLSPACING="0"
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40 ><TR
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41 ><TH
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42 COLSPAN="3"
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43 ALIGN="center"
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44 >SDL Library Documentation</TH
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45 ></TR
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46 ><TR
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47 ><TD
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48 WIDTH="10%"
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49 ALIGN="left"
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50 VALIGN="bottom"
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51 ><A
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52 HREF="sdlcdtrack.html"
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53 ACCESSKEY="P"
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54 >Prev</A
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55 ></TD
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56 ><TD
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57 WIDTH="80%"
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58 ALIGN="center"
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59 VALIGN="bottom"
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60 ></TD
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61 ><TD
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62 WIDTH="10%"
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63 ALIGN="right"
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64 VALIGN="bottom"
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65 ><A
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66 HREF="sdlcreatethread.html"
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67 ACCESSKEY="N"
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68 >Next</A
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69 ></TD
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70 ></TR
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71 ></TABLE
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72 ><HR
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73 ALIGN="LEFT"
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74 WIDTH="100%"></DIV
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75 ><DIV
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76 CLASS="CHAPTER"
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77 ><H1
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78 ><A
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79 NAME="THREAD"
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80 ></A
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81 >Chapter 12. Multi-threaded Programming</H1
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82 ><DIV
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83 CLASS="TOC"
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84 ><DL
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85 ><DT
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86 ><B
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87 >Table of Contents</B
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88 ></DT
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89 ><DT
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90 ><A
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91 HREF="sdlcreatethread.html"
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92 >SDL_CreateThread</A
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93 >&nbsp;--&nbsp;Creates a new thread of execution that shares its parent's properties.</DT
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94 ><DT
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95 ><A
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96 HREF="sdlthreadid.html"
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97 >SDL_ThreadID</A
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98 >&nbsp;--&nbsp;Get the 32-bit thread identifier for the current thread.</DT
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99 ><DT
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100 ><A
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101 HREF="sdlgetthreadid.html"
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102 >SDL_GetThreadID</A
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103 >&nbsp;--&nbsp;Get the SDL thread ID of a SDL_Thread</DT
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104 ><DT
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105 ><A
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106 HREF="sdlwaitthread.html"
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107 >SDL_WaitThread</A
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108 >&nbsp;--&nbsp;Wait for a thread to finish.</DT
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109 ><DT
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110 ><A
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111 HREF="sdlkillthread.html"
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112 >SDL_KillThread</A
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113 >&nbsp;--&nbsp;Gracelessly terminates the thread.</DT
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114 ><DT
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115 ><A
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116 HREF="sdlcreatemutex.html"
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117 >SDL_CreateMutex</A
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118 >&nbsp;--&nbsp;Create a mutex</DT
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119 ><DT
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120 ><A
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121 HREF="sdldestroymutex.html"
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122 >SDL_DestroyMutex</A
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123 >&nbsp;--&nbsp;Destroy a mutex</DT
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124 ><DT
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125 ><A
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126 HREF="sdlmutexp.html"
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127 >SDL_mutexP</A
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128 >&nbsp;--&nbsp;Lock a mutex</DT
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129 ><DT
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130 ><A
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131 HREF="sdlmutexv.html"
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132 >SDL_mutexV</A
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133 >&nbsp;--&nbsp;Unlock a mutex</DT
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134 ><DT
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135 ><A
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136 HREF="sdlcreatesemaphore.html"
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137 >SDL_CreateSemaphore</A
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138 >&nbsp;--&nbsp;Creates a new semaphore and assigns an initial value to it.</DT
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139 ><DT
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140 ><A
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141 HREF="sdldestroysemaphore.html"
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142 >SDL_DestroySemaphore</A
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143 >&nbsp;--&nbsp;Destroys a semaphore that was created by <A
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144 HREF="sdlcreatesemaphore.html"
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145 >SDL_CreateSemaphore</A
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146 >.</DT
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147 ><DT
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148 ><A
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149 HREF="sdlsemwait.html"
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150 >SDL_SemWait</A
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151 >&nbsp;--&nbsp;Lock a semaphore and suspend the thread if the semaphore value is zero.</DT
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152 ><DT
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153 ><A
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154 HREF="sdlsemtrywait.html"
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155 >SDL_SemTryWait</A
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156 >&nbsp;--&nbsp;Attempt to lock a semaphore but don't suspend the thread.</DT
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157 ><DT
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158 ><A
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159 HREF="sdlsemwaittimeout.html"
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160 >SDL_SemWaitTimeout</A
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161 >&nbsp;--&nbsp;Lock a semaphore, but only wait up to a specified maximum time.</DT
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162 ><DT
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163 ><A
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164 HREF="sdlsempost.html"
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165 >SDL_SemPost</A
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166 >&nbsp;--&nbsp;Unlock a semaphore.</DT
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167 ><DT
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168 ><A
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169 HREF="sdlsemvalue.html"
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170 >SDL_SemValue</A
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171 >&nbsp;--&nbsp;Return the current value of a semaphore.</DT
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172 ><DT
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173 ><A
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174 HREF="sdlcreatecond.html"
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175 >SDL_CreateCond</A
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176 >&nbsp;--&nbsp;Create a condition variable</DT
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177 ><DT
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178 ><A
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179 HREF="sdldestroycond.html"
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180 >SDL_DestroyCond</A
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181 >&nbsp;--&nbsp;Destroy a condition variable</DT
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182 ><DT
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183 ><A
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184 HREF="sdlcondsignal.html"
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185 >SDL_CondSignal</A
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186 >&nbsp;--&nbsp;Restart a thread wait on a condition variable</DT
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187 ><DT
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188 ><A
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189 HREF="sdlcondbroadcast.html"
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190 >SDL_CondBroadcast</A
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191 >&nbsp;--&nbsp;Restart all threads waiting on a condition variable</DT
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192 ><DT
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193 ><A
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194 HREF="sdlcondwait.html"
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195 >SDL_CondWait</A
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196 >&nbsp;--&nbsp;Wait on a condition variable</DT
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197 ><DT
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198 ><A
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199 HREF="sdlcondwaittimeout.html"
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200 >SDL_CondWaitTimeout</A
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201 >&nbsp;--&nbsp;Wait on a condition variable, with timeout</DT
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202 ></DL
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203 ></DIV
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204 ><P
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205 >SDL provides functions for creating threads, mutexes, semphores and condition variables.</P
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206 ><P
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207 >In general, you must be very aware of concurrency and data integrity issues
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208 when writing multi-threaded programs. Some good guidelines include:
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209 <P
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210 ></P
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211 ><UL
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212 ><LI
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213 ><P
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214 >Don't call SDL video/event functions from separate threads</P
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215 ></LI
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216 ><LI
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217 ><P
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218 >Don't use any library functions in separate threads</P
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219 ></LI
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220 ><LI
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221 ><P
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222 >Don't perform any memory management in separate threads</P
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223 ></LI
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224 ><LI
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225 ><P
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226 >Lock global variables which may be accessed by multiple threads</P
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227 ></LI
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228 ><LI
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229 ><P
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230 >Never terminate threads, always set a flag and wait for them to quit</P
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231 ></LI
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232 ><LI
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233 ><P
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234 >Think very carefully about all possible ways your code may interact</P
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235 ></LI
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236 ></UL
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237 ></P
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238 ><DIV
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239 CLASS="NOTE"
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240 ><BLOCKQUOTE
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241 CLASS="NOTE"
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242 ><P
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243 ><B
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244 >Note: </B
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245 >SDL's threading is not implemented on MacOS, due to that lack of preemptive thread support (Mac OS X dos nt suffer from this problem)</P
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246 ></BLOCKQUOTE
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247 ></DIV
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248 ></DIV
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249 ><DIV
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250 CLASS="NAVFOOTER"
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251 ><HR
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252 ALIGN="LEFT"
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253 WIDTH="100%"><TABLE
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254 SUMMARY="Footer navigation table"
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255 WIDTH="100%"
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256 BORDER="0"
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257 CELLPADDING="0"
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258 CELLSPACING="0"
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259 ><TR
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260 ><TD
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261 WIDTH="33%"
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262 ALIGN="left"
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263 VALIGN="top"
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264 ><A
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265 HREF="sdlcdtrack.html"
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266 ACCESSKEY="P"
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267 >Prev</A
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268 ></TD
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269 ><TD
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270 WIDTH="34%"
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271 ALIGN="center"
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272 VALIGN="top"
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273 ><A
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274 HREF="index.html"
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275 ACCESSKEY="H"
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276 >Home</A
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277 ></TD
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278 ><TD
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279 WIDTH="33%"
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280 ALIGN="right"
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281 VALIGN="top"
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282 ><A
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283 HREF="sdlcreatethread.html"
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284 ACCESSKEY="N"
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285 >Next</A
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286 ></TD
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287 ></TR
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288 ><TR
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289 ><TD
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290 WIDTH="33%"
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291 ALIGN="left"
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292 VALIGN="top"
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293 >SDL_CDtrack</TD
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294 ><TD
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295 WIDTH="34%"
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296 ALIGN="center"
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297 VALIGN="top"
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298 ><A
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299 HREF="reference.html"
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300 ACCESSKEY="U"
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301 >Up</A
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302 ></TD
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303 ><TD
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304 WIDTH="33%"
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305 ALIGN="right"
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306 VALIGN="top"
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307 >SDL_CreateThread</TD
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308 ></TR
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309 ></TABLE
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310 ></DIV
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311 ></BODY
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312 ></HTML
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313 >