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| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="boost_regex.background_information.thread_safety"></a><a class="link" href="thread_safety.html" title="Thread Safety"> Thread |
| Safety</a> |
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| <p> |
| The Boost.Regex library is thread safe when Boost is: you can verify that |
| Boost is in thread safe mode by checking to see if <code class="computeroutput"><span class="identifier">BOOST_HAS_THREADS</span></code> |
| is defined: this macro is set automatically by the config system when threading |
| support is turned on in your compiler. |
| </p> |
| <p> |
| Class <a class="link" href="../ref/basic_regex.html" title="basic_regex"><code class="computeroutput"><span class="identifier">basic_regex</span></code></a> |
| and its typedefs regex and wregex are thread safe, in that compiled regular |
| expressions can safely be shared between threads. The matching algorithms |
| <a class="link" href="../ref/regex_match.html" title="regex_match"><code class="computeroutput"><span class="identifier">regex_match</span></code></a>, |
| <a class="link" href="../ref/regex_search.html" title="regex_search"><code class="computeroutput"><span class="identifier">regex_search</span></code></a>, |
| and <a class="link" href="../ref/regex_replace.html" title="regex_replace"><code class="computeroutput"><span class="identifier">regex_replace</span></code></a> |
| are all re-entrant and thread safe. Class <a class="link" href="../ref/match_results.html" title="match_results"><code class="computeroutput"><span class="identifier">match_results</span></code></a> is now thread safe, |
| in that the results of a match can be safely copied from one thread to another |
| (for example one thread may find matches and push <a class="link" href="../ref/match_results.html" title="match_results"><code class="computeroutput"><span class="identifier">match_results</span></code></a> instances onto a queue, |
| while another thread pops them off the other end), otherwise use a separate |
| instance of <a class="link" href="../ref/match_results.html" title="match_results"><code class="computeroutput"><span class="identifier">match_results</span></code></a> |
| per thread. |
| </p> |
| <p> |
| The <a class="link" href="../ref/posix.html" title="POSIX Compatible C API's">POSIX API functions</a> are |
| all re-entrant and thread safe, regular expressions compiled with regcomp |
| can also be shared between threads. |
| </p> |
| <p> |
| The <a class="link" href="../ref/deprecated_interfaces/old_regex.html" title="High Level Class RegEx (Deprecated)">class |
| RegEx</a> is only thread safe if each thread gets its own RegEx instance |
| (apartment threading) - this is a consequence of RegEx handling both compiling |
| and matching regular expressions. |
| </p> |
| <p> |
| Finally note that changing the global locale invalidates all compiled regular |
| expressions, therefore calling <code class="computeroutput"><span class="identifier">set_locale</span></code> |
| from one thread while another uses regular expressions will produce unpredictable |
| results. |
| </p> |
| <p> |
| There is also a requirement that there is only one thread executing prior |
| to the start of main(). |
| </p> |
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| <td align="right"><div class="copyright-footer">Copyright © 1998 -2010 John Maddock<p> |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) |
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