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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>11.2 OTcl Timer class</TITLE><META NAME="description" CONTENT="11.2 OTcl Timer class"><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="node126.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node126.html"><LINK REL="previous" HREF="node122.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node122.html"><LINK REL="up" HREF="node121.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node121.html"><LINK REL="next" HREF="node126.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node126.html"></HEAD><BODY ><!--Navigation Panel--><A NAME="tex2html3211" HREF="node126.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node126.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html3205" HREF="node121.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node121.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html3199" HREF="node124.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node124.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html3207" 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="tex2html3209" 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="tex2html3212" HREF="node126.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node126.html">11.3 Commands at a</A><B> Up:</B> <A NAME="tex2html3206" HREF="node121.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node121.html">11. Timers</A><B> Previous:</B> <A NAME="tex2html3200" HREF="node124.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node124.html">11.1.2 Example: Tcp retransmission</A>   <B> <A NAME="tex2html3208" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html3210" 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="SECTION03820000000000000000"></A><A NAME="sec:otcltimer"></A><BR>11.2 OTcl Timer class</H1><P>A simple timer class is defined in tcl/mcast/timer.tcl. Subclasses of<TT>Timer</TT> can be defined as needed. Unlike the C++ timer API, where a []sched aborts if the timer is already set, []sched and[]resched are the same; i.e., no state is kept for the OTcl timers.The following methods are defined in the <TT>Timer</TT> base class:<PRE> $self sched $delay # causes "$self timeout" to be called $delay seconds in the future; $self resched $delay # same as "$self sched $delay" ; $self cancel # cancels any pending scheduled callback; $self destroy # same as "$self cancel"; $self expire # calls "$self timeout" immediately;</PRE><P><BR><HR><ADDRESS>2003-09-23</ADDRESS></BODY></HTML>⌨️ 快捷键说明
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