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71 lines
3.8 KiB
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71 lines
3.8 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<html>
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<head>
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<title>Boost.Regex: Thread Safety</title>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<link rel="stylesheet" type="text/css" href="../../../boost.css">
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</head>
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<body>
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<P>
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<TABLE id="Table1" cellSpacing="1" cellPadding="1" width="100%" border="0">
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<TR>
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<td valign="top" width="300">
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<h3><a href="../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../c++boost.gif" border="0"></a></h3>
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</td>
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<TD width="353">
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<H1 align="center">Boost.Regex</H1>
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<H2 align="center">Thread Safety</H2>
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</TD>
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<td width="50">
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<h3><a href="index.html"><img height="45" width="43" alt="Boost.Regex Index" src="uarrow.gif" border="0"></a></h3>
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</td>
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</TR>
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</TABLE>
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</P>
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<HR>
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<P>The regex library is thread safe when Boost is: you can verify that Boost is in
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thread safe mode by checking to see if BOOST_HAS_THREADS is defined: this macro
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is set automatically by the config system when threading support is turned on
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in your compiler.
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</P>
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<P>Class <A href="basic_regex.html">basic_regex</A><> and its typedefs regex
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and wregex are thread safe, in that compiled regular expressions can safely be
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shared between threads. The matching algorithms <A href="regex_match.html">regex_match</A>,
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<A href="regex_search.html">regex_search</A>, <A href="regex_grep.html">regex_grep</A>,
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<A href="regex_format.html">regex_format</A> and <A href="regex_merge.html">regex_merge</A>
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are all re-entrant and thread safe. Class <A href="match_results.html">match_results</A>
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is now thread safe, in that the results of a match can be safely copied from
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one thread to another (for example one thread may find matches and push
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match_results instances onto a queue, while another thread pops them off the
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other end), otherwise use a separate instance of <A href="match_results.html">match_results</A>
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per thread.
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</P>
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<P>The <A href="posix_api.html">POSIX API functions</A> are all re-entrant and
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thread safe, regular expressions compiled with <I>regcomp</I> can also be
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shared between threads.
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</P>
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<P>The class<A href="regex.html"> RegEx</A> is only thread safe if each thread
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gets its own RegEx instance (apartment threading) - this is a consequence of
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RegEx handling both compiling and matching regular expressions.
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</P>
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<P>Finally note that changing the global locale invalidates all compiled regular
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expressions, therefore calling <I>set_locale</I> from one thread while another
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uses regular expressions <I>will</I> produce unpredictable results.
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</P>
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<P>
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There is also a requirement that there is only one thread executing prior to
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the start of main().</P>
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<HR>
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<p>Revised
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<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
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24 Oct 2003
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<!--webbot bot="Timestamp" endspan i-checksum="39359" --></p>
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<p><i><EFBFBD> Copyright John Maddock 1998-
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<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%Y" startspan -->
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2003<!--webbot bot="Timestamp" endspan i-checksum="39359" --></i></p>
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<P><I>Use, modification and distribution are subject to the Boost Software License,
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Version 1.0. (See accompanying file <A href="../../../LICENSE_1_0.txt">LICENSE_1_0.txt</A>
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or copy at <A href="http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</A>)</I></P>
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</body>
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</html>
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