annotate docs/html/sdladdtimer.html @ 1861:b42823412c3b

Fixed bug #232 ------- Comment #2 From Matthias Geissert 2006-05-24 07:54 [reply] ------- See http://dri.sourceforge.net/doc/DRIuserguide.html, section 11.5. There is written that you need to use RTLD_GLOBAL, since, otherwise, nested open of dynamic libraries doesn't work. However, This is necassary in this case, since libGL opens the hardware-specific driver/library. I hope this helps you.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 20 Jun 2006 03:52:41 +0000
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1 <HTML
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2 ><HEAD
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3 ><TITLE
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4 >SDL_AddTimer</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="Time"
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14 HREF="time.html"><LINK
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15 REL="PREVIOUS"
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17 HREF="sdldelay.html"><LINK
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18 REL="NEXT"
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19 TITLE="SDL_RemoveTimer"
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20 HREF="sdlremovetimer.html"></HEAD
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24 TEXT="#000000"
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30 ><TABLE
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31 SUMMARY="Header navigation table"
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36 ><TR
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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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44 WIDTH="10%"
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46 VALIGN="bottom"
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47 ><A
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48 HREF="sdldelay.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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60 VALIGN="bottom"
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61 ><A
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62 HREF="sdlremovetimer.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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67 ></TABLE
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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="SDLADDTIMER"
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74 ></A
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75 >SDL_AddTimer</H1
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76 ><DIV
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77 CLASS="REFNAMEDIV"
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78 ><A
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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_AddTimer&nbsp;--&nbsp;Add a timer which will call a callback after the specified number of milliseconds has
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84 elapsed.</DIV
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85 ><DIV
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86 CLASS="REFSYNOPSISDIV"
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87 ><A
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89 ></A
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90 ><H2
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91 >Synopsis</H2
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92 ><DIV
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93 CLASS="FUNCSYNOPSIS"
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94 ><A
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95 NAME="AEN8486"
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96 ></A
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97 ><P
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98 ></P
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99 ><PRE
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100 CLASS="FUNCSYNOPSISINFO"
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101 >#include "SDL.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 >SDL_TimerID <B
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107 CLASS="FSFUNC"
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108 >SDL_AddTimer</B
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109 ></CODE
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110 >(Uint32 interval, SDL_NewTimerCallback callback, void *param);</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="SDLNEWTIMERCALLBACK"
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120 ></A
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121 ><H2
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122 >Callback</H2
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123 ><PRE
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124 CLASS="PROGRAMLISTING"
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125 >/* type definition for the "new" timer callback function */
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126 typedef Uint32 (*SDL_NewTimerCallback)(Uint32 interval, void *param);</PRE
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127 ></DIV
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128 ><DIV
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129 CLASS="REFSECT1"
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130 ><A
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131 NAME="AEN8495"
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132 ></A
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133 ><H2
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134 >Description</H2
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135 ><P
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136 >Adds a callback function to be run after the specified number of
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137 milliseconds has elapsed. The callback function is passed the current
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138 timer interval and the user supplied parameter from the
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139 <TT
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140 CLASS="FUNCTION"
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141 >SDL_AddTimer</TT
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142 > call and returns the next timer
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143 interval. If the returned value from the callback is the same as the one
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144 passed in, the periodic alarm continues, otherwise a new alarm is
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145 scheduled.</P
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146 ><P
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147 >To cancel a currently running timer call
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148 <A
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149 HREF="sdlremovetimer.html"
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150 >SDL_RemoveTimer</A
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151 > with the
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152 timer ID returned from
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153 <TT
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154 CLASS="FUNCTION"
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155 >SDL_AddTimer</TT
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156 >.</P
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157 ><P
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158 >The timer callback function may run in a different thread than your
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159 main program, and so shouldn't call any functions from within itself.
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160 You may always call <A
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161 HREF="sdlpushevent.html"
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162 >SDL_PushEvent</A
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163 >, however.</P
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164 ><P
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165 >The granularity of the timer is platform-dependent, but you should count
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166 on it being at least 10 ms as this is the most common number.
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167 This means that if
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168 you request a 16 ms timer, your callback will run approximately 20 ms
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169 later on an unloaded system. If you wanted to set a flag signaling
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170 a frame update at 30 frames per second (every 33 ms), you might set a
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171 timer for 30 ms (see example below).
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172
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173 If you use this function, you need to pass <TT
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174 CLASS="LITERAL"
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175 >SDL_INIT_TIMER</TT
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176 >
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177 to <A
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178 HREF="sdlinit.html"
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179 >SDL_Init</A
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180 >.</P
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181 ></DIV
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182 ><DIV
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183 CLASS="REFSECT1"
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184 ><A
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185 NAME="AEN8507"
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186 ></A
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187 ><H2
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188 >Return Value</H2
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189 ><P
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190 >Returns an ID value for the added timer or
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191 <SPAN
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192 CLASS="RETURNVALUE"
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193 >NULL</SPAN
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194 > if there was an error.</P
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195 ></DIV
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196 ><DIV
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197 CLASS="REFSECT1"
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198 ><A
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199 NAME="AEN8511"
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200 ></A
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201 ><H2
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202 >Examples</H2
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203 ><P
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204 ><PRE
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205 CLASS="PROGRAMLISTING"
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206 >my_timer_id = SDL_AddTimer((33/10)*10, my_callbackfunc, my_callback_param);</PRE
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207 ></P
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208 ></DIV
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209 ><DIV
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210 CLASS="REFSECT1"
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211 ><A
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212 NAME="AEN8515"
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213 ></A
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214 ><H2
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215 >See Also</H2
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216 ><P
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217 ><A
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218 HREF="sdlremovetimer.html"
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219 ><TT
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220 CLASS="FUNCTION"
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221 >SDL_RemoveTimer</TT
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222 ></A
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223 >,
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224 <A
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225 HREF="sdlpushevent.html"
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226 ><TT
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227 CLASS="FUNCTION"
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228 >SDL_PushEvent</TT
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229 ></A
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230 ></P
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231 ></DIV
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232 ><DIV
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233 CLASS="NAVFOOTER"
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234 ><HR
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235 ALIGN="LEFT"
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236 WIDTH="100%"><TABLE
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237 SUMMARY="Footer navigation table"
0
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238 WIDTH="100%"
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239 BORDER="0"
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240 CELLPADDING="0"
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241 CELLSPACING="0"
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242 ><TR
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243 ><TD
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244 WIDTH="33%"
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245 ALIGN="left"
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246 VALIGN="top"
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247 ><A
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248 HREF="sdldelay.html"
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249 ACCESSKEY="P"
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250 >Prev</A
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251 ></TD
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252 ><TD
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253 WIDTH="34%"
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254 ALIGN="center"
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255 VALIGN="top"
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256 ><A
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257 HREF="index.html"
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258 ACCESSKEY="H"
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259 >Home</A
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260 ></TD
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261 ><TD
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262 WIDTH="33%"
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263 ALIGN="right"
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264 VALIGN="top"
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265 ><A
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266 HREF="sdlremovetimer.html"
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267 ACCESSKEY="N"
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268 >Next</A
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269 ></TD
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270 ></TR
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271 ><TR
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272 ><TD
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273 WIDTH="33%"
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274 ALIGN="left"
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275 VALIGN="top"
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276 >SDL_Delay</TD
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277 ><TD
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278 WIDTH="34%"
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279 ALIGN="center"
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280 VALIGN="top"
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281 ><A
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282 HREF="time.html"
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283 ACCESSKEY="U"
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284 >Up</A
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285 ></TD
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286 ><TD
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287 WIDTH="33%"
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288 ALIGN="right"
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289 VALIGN="top"
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290 >SDL_RemoveTimer</TD
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291 ></TR
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292 ></TABLE
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293 ></DIV
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294 ></BODY
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295 ></HTML
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296 >