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annotate docs/html/sdldestroysemaphore.html @ 2328:91e601d9df8b

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re: bug#563. checking in some commented out trace code and a fix so that the in testalpha.c the background only flashes when alpha == 255. The problem that is being fixed is caused by clearing SDL_COPY_RLE_COLORKEY without setting SDL_COPY_RLE_DESIRED in SDL_UnRELSurface.
author Bob Pendleton <bob@pendleton.com>
date Fri, 14 Mar 2008 18:17:49 +0000
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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_DestroySemaphore</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_CreateSemaphore"
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17 HREF="sdlcreatesemaphore.html"><LINK
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18 REL="NEXT"
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19 TITLE="SDL_SemWait"
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20 HREF="sdlsemwait.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="sdlcreatesemaphore.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="sdlsemwait.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="SDLDESTROYSEMAPHORE"
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74 ></A
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75 >SDL_DestroySemaphore</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="AEN7982"
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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_DestroySemaphore&nbsp;--&nbsp;Destroys a semaphore that was created by <A
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84 HREF="sdlcreatesemaphore.html"
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85 >SDL_CreateSemaphore</A
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86 >.</DIV
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87 ><DIV
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88 CLASS="REFSYNOPSISDIV"
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89 ><A
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90 NAME="AEN7986"
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91 ></A
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92 ><H2
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93 >Synopsis</H2
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94 ><DIV
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95 CLASS="FUNCSYNOPSIS"
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96 ><A
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97 NAME="AEN7987"
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98 ></A
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99 ><P
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100 ></P
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101 ><PRE
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102 CLASS="FUNCSYNOPSISINFO"
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103 >#include "SDL.h"
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104 #include "SDL_thread.h"</PRE
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105 ><P
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106 ><CODE
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107 ><CODE
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108 CLASS="FUNCDEF"
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109 >void <B
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110 CLASS="FSFUNC"
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111 >SDL_DestroySemaphore</B
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112 ></CODE
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113 >(SDL_sem *sem);</CODE
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114 ></P
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115 ><P
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116 ></P
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117 ></DIV
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118 ></DIV
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119 ><DIV
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120 CLASS="REFSECT1"
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121 ><A
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122 NAME="AEN7993"
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123 ></A
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124 ><H2
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125 >Description</H2
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126 ><P
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127 ><TT
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128 CLASS="FUNCTION"
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129 >SDL_DestroySemaphore</TT
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130 > destroys the semaphore pointed to
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131 by <TT
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132 CLASS="PARAMETER"
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133 ><I
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134 >sem</I
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135 ></TT
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136 > that was created by
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137 <A
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138 HREF="sdlcreatesemaphore.html"
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139 ><TT
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140 CLASS="FUNCTION"
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141 >SDL_CreateSemaphore</TT
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142 ></A
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143 >.
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144 It is not safe to destroy a semaphore if there are threads currently blocked
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145 waiting on it.</P
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146 ></DIV
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147 ><DIV
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148 CLASS="REFSECT1"
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149 ><A
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150 NAME="AEN8000"
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151 ></A
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152 ><H2
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153 >Examples</H2
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154 ><P
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155 ><PRE
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156 CLASS="PROGRAMLISTING"
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157 >if (my_sem != NULL) {
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158 SDL_DestroySemaphore(my_sem);
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159 my_sem = NULL;
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160 }</PRE
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161 ></P
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162 ></DIV
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163 ><DIV
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164 CLASS="REFSECT1"
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165 ><A
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166 NAME="AEN8004"
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167 ></A
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168 ><H2
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169 >See Also</H2
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170 ><P
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171 ><A
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172 HREF="sdlcreatesemaphore.html"
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173 ><TT
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174 CLASS="FUNCTION"
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175 >SDL_CreateSemaphore</TT
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176 ></A
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177 >,
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178 <A
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179 HREF="sdlsemwait.html"
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180 ><TT
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181 CLASS="FUNCTION"
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182 >SDL_SemWait</TT
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183 ></A
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184 >,
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185 <A
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186 HREF="sdlsemtrywait.html"
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187 ><TT
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188 CLASS="FUNCTION"
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189 >SDL_SemTryWait</TT
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190 ></A
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191 >,
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192 <A
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193 HREF="sdlsemwaittimeout.html"
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194 ><TT
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195 CLASS="FUNCTION"
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196 >SDL_SemWaitTimeout</TT
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197 ></A
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198 >,
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199 <A
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200 HREF="sdlsempost.html"
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201 ><TT
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202 CLASS="FUNCTION"
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203 >SDL_SemPost</TT
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204 ></A
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205 >,
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206 <A
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207 HREF="sdlsemvalue.html"
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208 ><TT
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209 CLASS="FUNCTION"
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210 >SDL_SemValue</TT
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211 ></A
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212 ></P
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213 ></DIV
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214 ><DIV
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215 CLASS="NAVFOOTER"
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216 ><HR
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217 ALIGN="LEFT"
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218 WIDTH="100%"><TABLE
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219 SUMMARY="Footer navigation table"
0
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220 WIDTH="100%"
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221 BORDER="0"
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222 CELLPADDING="0"
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223 CELLSPACING="0"
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224 ><TR
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225 ><TD
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226 WIDTH="33%"
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227 ALIGN="left"
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228 VALIGN="top"
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229 ><A
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230 HREF="sdlcreatesemaphore.html"
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231 ACCESSKEY="P"
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232 >Prev</A
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233 ></TD
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234 ><TD
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235 WIDTH="34%"
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236 ALIGN="center"
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237 VALIGN="top"
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238 ><A
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239 HREF="index.html"
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240 ACCESSKEY="H"
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241 >Home</A
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242 ></TD
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243 ><TD
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244 WIDTH="33%"
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245 ALIGN="right"
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246 VALIGN="top"
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247 ><A
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248 HREF="sdlsemwait.html"
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249 ACCESSKEY="N"
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250 >Next</A
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251 ></TD
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252 ></TR
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253 ><TR
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254 ><TD
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255 WIDTH="33%"
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256 ALIGN="left"
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257 VALIGN="top"
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258 >SDL_CreateSemaphore</TD
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259 ><TD
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260 WIDTH="34%"
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261 ALIGN="center"
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262 VALIGN="top"
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263 ><A
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264 HREF="thread.html"
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265 ACCESSKEY="U"
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266 >Up</A
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267 ></TD
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268 ><TD
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269 WIDTH="33%"
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270 ALIGN="right"
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271 VALIGN="top"
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272 >SDL_SemWait</TD
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273 ></TR
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274 ></TABLE
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275 ></DIV
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276 ></BODY
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277 ></HTML
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278 >