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<html><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><!--Converted with jLaTeX2HTML 2002 (1.62) JA patch-1.4patched version by: Kenshi Muto, Debian Project.LaTeX2HTML 2002 (1.62),original version by: Nikos Drakos, CBLU, University of Leeds* revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan* with significant contributions from: Jens Lippmann, Marek Rouchal, Martin Wilck and others --><HTML><HEAD><TITLE>6.1.0.0.2 SimpleLink Procedures</TITLE><META NAME="description" CONTENT="6.1.0.0.2 SimpleLink Procedures"><META NAME="keywords" CONTENT="everything"><META NAME="resource-type" CONTENT="document"><META NAME="distribution" CONTENT="global"><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"><META NAME="Generator" CONTENT="jLaTeX2HTML v2002 JA patch-1.4"><META HTTP-EQUIV="Content-Style-Type" CONTENT="text/css"><LINK REL="STYLESHEET" HREF="everything.css" tppabs="http://www.isi.edu/nsnam/ns/doc/everything.css"><LINK REL="previous" HREF="node59.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node59.html"><LINK REL="up" HREF="node58.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node58.html"><LINK REL="next" HREF="node61.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node61.html"></HEAD><BODY ><!--Navigation Panel--><A NAME="tex2html2229" HREF="node61.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node61.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html2223" HREF="node58.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node58.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html2219" HREF="node59.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node59.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html2225" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html"><IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="file:/usr/share/latex2html/icons/contents.png"></A> <A NAME="tex2html2227" HREF="node590.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node590.html"><IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index" SRC="file:/usr/share/latex2html/icons/index.png"></A> <BR><B> Next:</B> <A NAME="tex2html2230" HREF="node61.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node61.html">6.2 Connectors</A><B> Up:</B> <A NAME="tex2html2224" HREF="node58.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node58.html">6.1 Instance Procedures for</A><B> Previous:</B> <A NAME="tex2html2220" HREF="node59.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node59.html">6.1.0.0.1 Link procedures</A>   <B> <A NAME="tex2html2226" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html2228" HREF="node590.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node590.html">Index</A></B> <BR><BR><!--End of Navigation Panel--><H4><A NAME="SECTION03310020000000000000">6.1.0.0.2 SimpleLink Procedures</A></H4>The Otcl SimpleLink../ns-2/ns-link.tclimplements a simple point-to-pointlink with an associated queue and delay<A NAME="tex2html16" HREF="footnode.html#foot2709" tppabs="http://www.isi.edu/nsnam/ns/doc/footnode.html#foot2709"><SUP>6.1</SUP></A>.It is derived from the base Otcl class Link as follows:<PRE> Class SimpleLink -superclass Link SimpleLink instproc init { src dst bw delay q { lltype "DelayLink" } } { $self next $src $dst $self instvar link_ queue_ head_ toNode_ ttl_ ... set queue_ $q set link_ [new Delay/Link] $link_ set bandwidth_ $bw $link_ set delay_ $delay $queue_ target $link_ $link_ target [$toNode_ entry] ... # XXX # put the ttl checker after the delay # so we don't have to worry about accounting # for ttl-drops within the trace and/or monitor # fabric # set ttl_ [new TTLChecker] $ttl_ target [$link_ target] $link_ target $ttl_ }</PRE>Notice that when a <TT>SimpleLink</TT> object is created,new <TT>Delay/Link</TT> and <TT>TTLChecker</TT> objects arealso created.Note also that,the <TT>Queue</TT> object must have already been created.<P>There are two additional methods implemented (in OTcl) as partof the <TT>SimpleLink</TT> class: <TT>trace</TT> and <TT>init-monitor</TT>.These functions are described in further detailin the section on tracingChapterchap:trace. <P><BR><HR><ADDRESS>2003-09-23</ADDRESS></BODY></HTML>⌨️ 快捷键说明
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