ceph/src/boost/libs/regex/doc/html/boost_regex/background_information/thread_safety.html

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  26 <div class="titlepage"><div><div><h3 class="title">
  27 <a name="boost_regex.background_information.thread_safety"></a><a class="link" href="thread_safety.html" title="Thread Safety">Thread
  28       Safety</a>
  29 </h3></div></div></div>
  30 <p>
  31         The Boost.Regex library is thread safe when Boost is: you can verify that
  32         Boost is in thread safe mode by checking to see if <code class="computeroutput"><span class="identifier">BOOST_HAS_THREADS</span></code>
  33         is defined: this macro is set automatically by the config system when threading
  34         support is turned on in your compiler.
  35       </p>
  36 <p>
  37         Class <a class="link" href="../ref/basic_regex.html" title="basic_regex"><code class="computeroutput"><span class="identifier">basic_regex</span></code></a>
  38         and its typedefs regex and wregex are thread safe, in that compiled regular
  39         expressions can safely be shared between threads. The matching algorithms
  40         <a class="link" href="../ref/regex_match.html" title="regex_match"><code class="computeroutput"><span class="identifier">regex_match</span></code></a>,
  41         <a class="link" href="../ref/regex_search.html" title="regex_search"><code class="computeroutput"><span class="identifier">regex_search</span></code></a>,
  42         and <a class="link" href="../ref/regex_replace.html" title="regex_replace"><code class="computeroutput"><span class="identifier">regex_replace</span></code></a>
  43         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,
  44         in that the results of a match can be safely copied from one thread to another
  45         (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,
  46         while another thread pops them off the other end), otherwise use a separate
  47         instance of <a class="link" href="../ref/match_results.html" title="match_results"><code class="computeroutput"><span class="identifier">match_results</span></code></a>
  48         per thread.
  49       </p>
  50 <p>
  51         The <a class="link" href="../ref/posix.html" title="POSIX Compatible C API's">POSIX API functions</a> are
  52         all re-entrant and thread safe, regular expressions compiled with regcomp
  53         can also be shared between threads.
  54       </p>
  55 <p>
  56         The <a class="link" href="../ref/deprecated_interfaces/old_regex.html" title="High Level Class RegEx (Deprecated)">class
  57         RegEx</a> is only thread safe if each thread gets its own RegEx instance
  58         (apartment threading) - this is a consequence of RegEx handling both compiling
  59         and matching regular expressions.
  60       </p>
  61 <p>
  62         Finally note that changing the global locale invalidates all compiled regular
  63         expressions, therefore calling <code class="computeroutput"><span class="identifier">set_locale</span></code>
  64         from one thread while another uses regular expressions will produce unpredictable
  65         results.
  66       </p>
  67 <p>
  68         There is also a requirement that there is only one thread executing prior
  69         to the start of main().
  70       </p>
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  74 <td align="right"><div class="copyright-footer">Copyright &#169; 1998-2013 John Maddock<p>
  75         Distributed under the Boost Software License, Version 1.0. (See accompanying
  76         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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