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+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
+<html>
+ <head>
+ <meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1">
+ <title>File Index</title>
+ <link href="doxygen.css" rel="stylesheet" type="text/css">
+ </head>
+ <body>
+<!-- Generated by Doxygen 1.3.4 -->
+<div class="qindex"><a class="qindex" href="main.html">Main&nbsp;Page</a> | <a class="qindex" href="classes.html">Alphabetical&nbsp;List</a> | <a class="qindex" href="annotated.html">Data&nbsp;Structures</a> | <a class="qindex" href="files.html">File&nbsp;List</a> | <a class="qindex" href="functions.html">Data&nbsp;Fields</a> | <a class="qindex" href="globals.html">Globals</a></div>
+<h1>dmxsync.c File Reference</h1><code>#include "<a class="el" href="dmx_8h-source.html">dmx.h</a>"</code><br>
+<code>#include "<a class="el" href="dmxsync_8h-source.html">dmxsync.h</a>"</code><br>
+<code>#include "<a class="el" href="dmxstat_8h-source.html">dmxstat.h</a>"</code><br>
+<code>#include "<a class="el" href="dmxlog_8h-source.html">dmxlog.h</a>"</code><br>
+<code>#include &lt;sys/time.h&gt;</code><br>
+<table border=0 cellpadding=0 cellspacing=0>
+<tr><td></td></tr>
+<tr><td colspan=2><br><h2>Functions</h2></td></tr>
+<tr><td class="memItemLeft" nowrap align=right valign=top>void&nbsp;</td><td class="memItemRight" valign=bottom><a class="el" href="dmxsync_8c.html#a7">dmxSyncActivate</a> (const char *interval)</td></tr>
+
+<tr><td class="memItemLeft" nowrap align=right valign=top>void&nbsp;</td><td class="memItemRight" valign=bottom><a class="el" href="dmxsync_8c.html#a8">dmxSyncInit</a> (void)</td></tr>
+
+<tr><td class="memItemLeft" nowrap align=right valign=top>void&nbsp;</td><td class="memItemRight" valign=bottom><a class="el" href="dmxsync_8c.html#a9">dmxSync</a> (<a class="el" href="struct__DMXScreenInfo.html">DMXScreenInfo</a> *dmxScreen, Bool now)</td></tr>
+
+</table>
+<hr><a name="_details"></a><h2>Detailed Description</h2>
+The DMX server code is written to call <a class="el" href="dmxsync_8c.html#a9">dmxSync()</a> whenever an XSync() might be necessary. However, since XSync() requires a two way communication with the other X server, eliminating unnecessary XSync() calls is a key performance optimization. Support for this optimization is provided here. Statistics about XSync() calls and latency are gathered in #dmxstat.c.<p>
+During the initial conversion from calling XSync() immediately to the XSync() batching method implemented in this file, it was noted that, out of more than 300 <em>x11perf</em> tests, 8 tests became more than 100 times faster, with 68 more than 50X faster, 114 more than 10X faster, and 181 more than 2X faster.<hr><h2>Function Documentation</h2>
+<a class="anchor" name="a9" doxytag="dmxsync.c::dmxSync" ></a><p>
+<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
+ <tr>
+ <td class="mdRow">
+ <table cellpadding="0" cellspacing="0" border="0">
+ <tr>
+ <td class="md" nowrap valign="top"> void dmxSync </td>
+ <td class="md" valign="top">(&nbsp;</td>
+ <td class="md" nowrap valign="top"><a class="el" href="struct__DMXScreenInfo.html">DMXScreenInfo</a> *&nbsp;</td>
+ <td class="mdname" nowrap> <em>dmxScreen</em>, </td>
+ </tr>
+ <tr>
+ <td></td>
+ <td></td>
+ <td class="md" nowrap>Bool&nbsp;</td>
+ <td class="mdname" nowrap> <em>now</em></td>
+ </tr>
+ <tr>
+ <td></td>
+ <td class="md">)&nbsp;</td>
+ <td class="md" colspan="2"></td>
+ </tr>
+
+ </table>
+ </td>
+ </tr>
+</table>
+<table cellspacing=5 cellpadding=0 border=0>
+ <tr>
+ <td>
+ &nbsp;
+ </td>
+ <td>
+
+<p>
+Request an XSync() to the display used by <em>dmxScreen</em>. If <em>now</em> is TRUE, call XSync() immediately instead of waiting for the next XSync() batching point. Note that if XSync() batching was deselected with <a class="el" href="dmxsync_8c.html#a7">dmxSyncActivate()</a> before <a class="el" href="dmxsync_8c.html#a8">dmxSyncInit()</a> was called, then no XSync() batching is performed and this function always calles XSync() immediately.<p>
+(Note that this function uses TimerSet but works correctly in the face of a server generation. See the source for details.)<p>
+If <em>dmxScreen</em> is <em>NULL</em>, then all pending syncs will be flushed immediately. </td>
+ </tr>
+</table>
+<a class="anchor" name="a7" doxytag="dmxsync.c::dmxSyncActivate" ></a><p>
+<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
+ <tr>
+ <td class="mdRow">
+ <table cellpadding="0" cellspacing="0" border="0">
+ <tr>
+ <td class="md" nowrap valign="top"> void dmxSyncActivate </td>
+ <td class="md" valign="top">(&nbsp;</td>
+ <td class="md" nowrap valign="top">const char *&nbsp;</td>
+ <td class="mdname1" valign="top" nowrap> <em>interval</em> </td>
+ <td class="md" valign="top">&nbsp;)&nbsp;</td>
+ <td class="md" nowrap></td>
+ </tr>
+
+ </table>
+ </td>
+ </tr>
+</table>
+<table cellspacing=5 cellpadding=0 border=0>
+ <tr>
+ <td>
+ &nbsp;
+ </td>
+ <td>
+
+<p>
+Request the XSync() batching optimization with the specified <em>interval</em> (in mS). If the <em>interval</em> is 0, 100mS is used. If the <em>interval</em> is less than 0, then the XSync() batching optimization is not requested (e.g., so the -syncbatch -1 command line option can turn off the default 100mS XSync() batching).<p>
+Note that the parameter to this routine is a string, since it will usually be called from <a class="el" href="dmxinit_8c.html#a40">ddxProcessArgument</a> in #dmxinit.c </td>
+ </tr>
+</table>
+<a class="anchor" name="a8" doxytag="dmxsync.c::dmxSyncInit" ></a><p>
+<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
+ <tr>
+ <td class="mdRow">
+ <table cellpadding="0" cellspacing="0" border="0">
+ <tr>
+ <td class="md" nowrap valign="top"> void dmxSyncInit </td>
+ <td class="md" valign="top">(&nbsp;</td>
+ <td class="md" nowrap valign="top">void&nbsp;</td>
+ <td class="mdname1" valign="top" nowrap> </td>
+ <td class="md" valign="top">&nbsp;)&nbsp;</td>
+ <td class="md" nowrap></td>
+ </tr>
+
+ </table>
+ </td>
+ </tr>
+</table>
+<table cellspacing=5 cellpadding=0 border=0>
+ <tr>
+ <td>
+ &nbsp;
+ </td>
+ <td>
+
+<p>
+Initialize the XSync() batching optimization, but only if <a class="el" href="dmxsync_8h.html#a0">dmxSyncActivate</a> was last called with a non-negative value. </td>
+ </tr>
+</table>
+ <hr>
+ <address>
+ <small>
+ Generated June 29, 2004 for <a
+ href="http://dmx.sourceforge.net">Distributed Multihead X</a> by
+ <a href="http://www.doxygen.org/index.html">doxygen</a>
+ 1.3.4.
+ </small>
+ </addres>
+ </hr>
+ </body>
+</html>