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Slight optimization of the shader, no need to scale into 0..255
author Sam Lantinga <slouken@libsdl.org>
date Sun, 07 Dec 2008 04:38:32 +0000
parents 355632dca928
children
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1 <HTML
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2 ><HEAD
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3 ><TITLE
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4 >SDL_SemPost</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="Multi-threaded Programming"
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14 HREF="thread.html"><LINK
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15 REL="PREVIOUS"
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16 TITLE="SDL_SemWaitTimeout"
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17 HREF="sdlsemwaittimeout.html"><LINK
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18 REL="NEXT"
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19 TITLE="SDL_SemValue"
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20 HREF="sdlsemvalue.html"></HEAD
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21 ><BODY
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22 CLASS="REFENTRY"
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23 BGCOLOR="#FFF8DC"
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24 TEXT="#000000"
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25 LINK="#0000ee"
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26 VLINK="#551a8b"
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27 ALINK="#ff0000"
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28 ><DIV
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29 CLASS="NAVHEADER"
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30 ><TABLE
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31 SUMMARY="Header navigation table"
0
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32 WIDTH="100%"
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33 BORDER="0"
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34 CELLPADDING="0"
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35 CELLSPACING="0"
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36 ><TR
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37 ><TH
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38 COLSPAN="3"
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39 ALIGN="center"
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40 >SDL Library Documentation</TH
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41 ></TR
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42 ><TR
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43 ><TD
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44 WIDTH="10%"
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45 ALIGN="left"
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46 VALIGN="bottom"
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47 ><A
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48 HREF="sdlsemwaittimeout.html"
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49 ACCESSKEY="P"
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50 >Prev</A
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51 ></TD
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52 ><TD
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53 WIDTH="80%"
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54 ALIGN="center"
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55 VALIGN="bottom"
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56 ></TD
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57 ><TD
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58 WIDTH="10%"
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59 ALIGN="right"
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60 VALIGN="bottom"
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61 ><A
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62 HREF="sdlsemvalue.html"
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63 ACCESSKEY="N"
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64 >Next</A
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65 ></TD
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66 ></TR
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67 ></TABLE
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68 ><HR
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69 ALIGN="LEFT"
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70 WIDTH="100%"></DIV
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71 ><H1
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72 ><A
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73 NAME="SDLSEMPOST"
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74 ></A
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75 >SDL_SemPost</H1
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76 ><DIV
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77 CLASS="REFNAMEDIV"
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78 ><A
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79 NAME="AEN8170"
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80 ></A
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81 ><H2
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82 >Name</H2
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83 >SDL_SemPost&nbsp;--&nbsp;Unlock a semaphore.</DIV
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84 ><DIV
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85 CLASS="REFSYNOPSISDIV"
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86 ><A
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87 NAME="AEN8173"
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88 ></A
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89 ><H2
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90 >Synopsis</H2
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91 ><DIV
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92 CLASS="FUNCSYNOPSIS"
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93 ><A
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94 NAME="AEN8174"
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95 ></A
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96 ><P
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97 ></P
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98 ><PRE
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99 CLASS="FUNCSYNOPSISINFO"
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100 >#include "SDL.h"
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101 #include "SDL_thread.h"</PRE
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102 ><P
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103 ><CODE
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104 ><CODE
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105 CLASS="FUNCDEF"
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106 >int <B
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107 CLASS="FSFUNC"
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108 >SDL_SemPost</B
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109 ></CODE
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110 >(SDL_sem *sem);</CODE
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111 ></P
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112 ><P
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113 ></P
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114 ></DIV
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115 ></DIV
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116 ><DIV
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117 CLASS="REFSECT1"
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118 ><A
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119 NAME="AEN8180"
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120 ></A
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121 ><H2
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122 >Description</H2
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123 ><P
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124 ><TT
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125 CLASS="FUNCTION"
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126 >SDL_SemPost</TT
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127 > unlocks the semaphore pointed to by
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128 <TT
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129 CLASS="PARAMETER"
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130 ><I
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131 >sem</I
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132 ></TT
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133 > and atomically increments the semaphores value.
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134 Threads that were blocking on the semaphore may be scheduled after this call
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135 succeeds.</P
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136 ><P
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137 ><TT
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138 CLASS="FUNCTION"
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139 >SDL_SemPost</TT
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140 > should be called after a semaphore is locked by a successful call to
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141 <A
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142 HREF="sdlsemwait.html"
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143 >SDL_SemWait</A
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144 >,
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145 <A
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146 HREF="sdlsemtrywait.html"
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147 >SDL_SemTryWait</A
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148 > or
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149 <A
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150 HREF="sdlsemwaittimeout.html"
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151 >SDL_SemWaitTimeout</A
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152 >.</P
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153 ></DIV
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154 ><DIV
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155 CLASS="REFSECT1"
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156 ><A
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157 NAME="AEN8190"
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158 ></A
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159 ><H2
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160 >Return Value</H2
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161 ><P
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162 >Returns <SPAN
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163 CLASS="RETURNVALUE"
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164 >0</SPAN
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165 > if successful or
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166 <SPAN
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167 CLASS="RETURNVALUE"
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168 >-1</SPAN
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169 > if there was an error (leaving the semaphore unchanged).</P
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170 ></DIV
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171 ><DIV
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172 CLASS="REFSECT1"
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173 ><A
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174 NAME="AEN8195"
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175 ></A
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176 ><H2
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177 >Examples</H2
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178 ><P
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179 ><PRE
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180 CLASS="PROGRAMLISTING"
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181 >SDL_SemPost(my_sem);</PRE
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182 ></P
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183 ></DIV
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184 ><DIV
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185 CLASS="REFSECT1"
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186 ><A
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187 NAME="AEN8199"
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188 ></A
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189 ><H2
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190 >See Also</H2
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191 ><P
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192 ><A
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193 HREF="sdlcreatesemaphore.html"
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194 ><TT
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195 CLASS="FUNCTION"
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196 >SDL_CreateSemaphore</TT
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197 ></A
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198 >,
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199 <A
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200 HREF="sdldestroysemaphore.html"
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201 ><TT
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202 CLASS="FUNCTION"
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203 >SDL_DestroySemaphore</TT
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204 ></A
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205 >,
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206 <A
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207 HREF="sdlsemwait.html"
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208 ><TT
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209 CLASS="FUNCTION"
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210 >SDL_SemWait</TT
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211 ></A
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212 >,
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213 <A
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214 HREF="sdlsemtrywait.html"
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215 ><TT
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216 CLASS="FUNCTION"
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217 >SDL_SemTryWait</TT
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218 ></A
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219 >,
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220 <A
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221 HREF="sdlsemwaittimeout.html"
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222 ><TT
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223 CLASS="FUNCTION"
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224 >SDL_SemWaitTimeout</TT
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225 ></A
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226 >,
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227 <A
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228 HREF="sdlsemvalue.html"
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229 ><TT
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230 CLASS="FUNCTION"
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231 >SDL_SemValue</TT
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232 ></A
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233 ></P
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234 ></DIV
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235 ><DIV
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236 CLASS="NAVFOOTER"
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237 ><HR
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238 ALIGN="LEFT"
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239 WIDTH="100%"><TABLE
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240 SUMMARY="Footer navigation table"
0
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241 WIDTH="100%"
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242 BORDER="0"
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243 CELLPADDING="0"
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244 CELLSPACING="0"
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245 ><TR
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246 ><TD
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247 WIDTH="33%"
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248 ALIGN="left"
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249 VALIGN="top"
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250 ><A
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251 HREF="sdlsemwaittimeout.html"
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252 ACCESSKEY="P"
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253 >Prev</A
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254 ></TD
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255 ><TD
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256 WIDTH="34%"
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257 ALIGN="center"
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258 VALIGN="top"
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259 ><A
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260 HREF="index.html"
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261 ACCESSKEY="H"
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262 >Home</A
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263 ></TD
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264 ><TD
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265 WIDTH="33%"
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266 ALIGN="right"
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267 VALIGN="top"
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268 ><A
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269 HREF="sdlsemvalue.html"
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270 ACCESSKEY="N"
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271 >Next</A
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272 ></TD
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273 ></TR
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274 ><TR
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275 ><TD
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276 WIDTH="33%"
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277 ALIGN="left"
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278 VALIGN="top"
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279 >SDL_SemWaitTimeout</TD
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280 ><TD
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281 WIDTH="34%"
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282 ALIGN="center"
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283 VALIGN="top"
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284 ><A
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285 HREF="thread.html"
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286 ACCESSKEY="U"
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287 >Up</A
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288 ></TD
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289 ><TD
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290 WIDTH="33%"
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291 ALIGN="right"
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292 VALIGN="top"
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293 >SDL_SemValue</TD
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294 ></TR
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295 ></TABLE
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296 ></DIV
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297 ></BODY
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298 ></HTML
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299 >