annotate docs/html/sdlsempost.html @ 4106:12bb6311fd5d SDL-1.2

Hans de Goede fixed bug #495 When running boswars: http://www.boswars.org/ on a machine with intel integrathed graphics it crashes when it tries to play the initial theora splashscreen video: X Error of failed request: BadAlloc (insufficient resources for operation) Major opcode of failed request: 140 (XVideo) Minor opcode of failed request: 19 () Serial number of failed request: 25 Current serial number in output stream: 26 boswars: xcb_xlib.c:41: xcb_xlib_lock: Assertion `!c->xlib.lock' failed. Aborted I recognized this problem from a few years back, when I encountered it while working on the Xv blitter for xmame. The problem is that for some reason creation the Xvport and XvImage succeeds, and failure (lack of resources / hw capability?) is only indicated during the first XvPut[Shm]Image. I've written a patch for SDL using the work around for this I developed for xmame (and which is still used successfully in xmame after many years of usage). I'll admit it isn't very pretty, but after investigating several possibilities this was the best option, any other fixes would need changes to the SDL api and abi.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 29 Dec 2007 02:23:48 +0000
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1 <HTML
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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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13 TITLE="Multi-threaded Programming"
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19 TITLE="SDL_SemValue"
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20 HREF="sdlsemvalue.html"></HEAD
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30 ><TABLE
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36 ><TR
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37 ><TH
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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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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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61 ><A
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62 HREF="sdlsemvalue.html"
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64 >Next</A
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65 ></TD
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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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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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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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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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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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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"
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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 >