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Next: <a href="Lex-and-Posix.html#Lex-and-Posix" accesskey="n" rel="next">Lex and Posix</a>, Previous: <a href="Cxx.html#Cxx" accesskey="p" rel="prev">Cxx</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Indices.html#Indices" title="Index" rel="index">Index</a>]</p>
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<a name="Reentrant-C-Scanners"></a>
<h2 class="chapter">19 Reentrant C Scanners</h2>
<a name="index-reentrant_002c-explanation"></a>
<p><code>flex</code> has the ability to generate a reentrant C scanner. This is
accomplished by specifying <code>%option reentrant</code> (‘<samp>-R</samp>’) The generated
scanner is both portable, and safe to use in one or more separate threads of
control. The most common use for reentrant scanners is from within
multi-threaded applications. Any thread may create and execute a reentrant
<code>flex</code> scanner without the need for synchronization with other threads.
</p>
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<tr><td align="left" valign="top">• <a href="Reentrant-Uses.html#Reentrant-Uses" accesskey="1">Reentrant Uses</a>:</td><td> </td><td align="left" valign="top">
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<tr><td align="left" valign="top">• <a href="Reentrant-Overview.html#Reentrant-Overview" accesskey="2">Reentrant Overview</a>:</td><td> </td><td align="left" valign="top">
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<tr><td align="left" valign="top">• <a href="Reentrant-Example.html#Reentrant-Example" accesskey="3">Reentrant Example</a>:</td><td> </td><td align="left" valign="top">
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<tr><td align="left" valign="top">• <a href="Reentrant-Functions.html#Reentrant-Functions" accesskey="5">Reentrant Functions</a>:</td><td> </td><td align="left" valign="top">
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