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However,it does not accordingly provide a garbage collection mechanism for theseallocated objects. This can easily lead to unintentional memory leaks.Important: tools such as dmalloc and purify are unable to detect this kindof memory leaks. For example, consider this simple piece of OTcl script: <PRE>set ns [new Simulator]for {set i 0} {$i \< 500} {incr i} { set a [new RandomVariable/Constant]}</PRE>One would expect that the memory usage should stay the same after thefirst RandomVariable is allocated. However, because OTcl does not havegarbage collection, when the second RandomVariable is allocated, theprevious one is not freed and hence results in memory leak. Unfortunately,there is no easy fix for this, because garbage collection of allocatedobjects is essentially incompatible with the spirit of Tcl. The only wayto fix this now is to always explicitly free every allocated OTcl objectin your script, in the same way that you take care of malloc-ed object inC/C++. <P><HR><!--Navigation Panel--><A NAME="tex2html5058" HREF="node246.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node246.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html5052" HREF="node244.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node244.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html5046" HREF="node244.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node244.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html5054" 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="tex2html5056" 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="tex2html5059" HREF="node246.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node246.html">21.5.2 C/C++</A><B> Up:</B> <A NAME="tex2html5053" HREF="node244.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node244.html">21.5 Memory Leaks</A><B> Previous:</B> <A NAME="tex2html5047" HREF="node244.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node244.html">21.5 Memory Leaks</A>   <B> <A NAME="tex2html5055" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html5057" HREF="node590.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node590.html">Index</A></B> <!--End of Navigation Panel--><ADDRESS>2003-09-23</ADDRESS></BODY></HTML>⌨️ 快捷键说明
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