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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>4.1 Simulator Initialization</TITLE><META NAME="description" CONTENT="4.1 Simulator Initialization"><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="next" HREF="node32.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node32.html"><LINK REL="previous" HREF="node30.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node30.html"><LINK REL="up" HREF="node30.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node30.html"><LINK REL="next" HREF="node32.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node32.html"></HEAD><BODY ><!--Navigation Panel--><A NAME="tex2html1796" HREF="node32.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node32.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html1790" HREF="node30.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node30.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html1784" HREF="node30.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node30.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html1792" 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="tex2html1794" 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="tex2html1797" HREF="node32.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node32.html">4.2 Schedulers and Events</A><B> Up:</B> <A NAME="tex2html1791" HREF="node30.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node30.html">4. The Class Simulator</A><B> Previous:</B> <A NAME="tex2html1785" HREF="node30.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node30.html">4. The Class Simulator</A>   <B> <A NAME="tex2html1793" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html1795" HREF="node590.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node590.html">Index</A></B> <BR><BR><!--End of Navigation Panel--><H1><A NAME="SECTION03110000000000000000"></A><A NAME="sec:siminit"></A><BR>4.1 Simulator Initialization</H1><P>When a new simulation object is created in tcl,the initialization procedure../ns-2/ns-lib.hSimulator::initperforms the following operations:<UL><LI>initialize the packet format (calls <TT>create_packetformat</TT>)</LI><LI>create a scheduler (defaults to a calendar scheduler)</LI><LI>create a ``null agent'' (a discard sink used in various places)</LI></UL>The packet format initialization sets up field offsets within packetsused by the entire simulation. It is described in more detailin the following chapter on packetsChapterchap:pformat.The scheduler runs the simulation in an event-driven manner and maybe replaced by alternative schedulers which provide somewhatdifferent semantics (see the following section for more detail).The null agent is created with the following call:<PRE> set nullAgent_ [new Agent/Null]</PRE>This agent is generally useful as a sink for dropped packets oras a destination for packets that are not counted or recorded.<P><BR><HR><ADDRESS>2003-09-23</ADDRESS></BODY></HTML>⌨️ 快捷键说明
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