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<title>Is Boost.Python thread-aware/compatible with multiple interpreters?</title>
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<div class="titlepage"><div><div><h3 class="title">
<a name="faq.is_boost_python_thread_aware_com"></a><a class="link" href="is_boost_python_thread_aware_com.html" title="Is Boost.Python thread-aware/compatible with multiple interpreters?">Is Boost.Python
      thread-aware/compatible with multiple interpreters?</a>
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<p>
        <span class="emphasis"><em>Niall Douglas provides these notes:</em></span>
      </p>
<p>
        The quick answer to this is: no.
      </p>
<p>
        The longer answer is that it can be patched to be so, but it's complex. You
        will need to add custom lock/unlock wrapping of every time your code enters
        Boost.Python (particularly every virtual function override) plus heavily
        modify <code class="computeroutput"><span class="identifier">boost</span><span class="special">/</span><span class="identifier">python</span><span class="special">/</span><span class="identifier">detail</span><span class="special">/</span><span class="identifier">invoke</span><span class="special">.</span><span class="identifier">hpp</span></code> with custom unlock/lock wrapping of
        every time Boost.Python enters your code. You must furthermore take care
        to <span class="emphasis"><em>not</em></span> unlock/lock when Boost.Python is invoking iterator
        changes via <code class="computeroutput"><span class="identifier">invoke</span><span class="special">.</span><span class="identifier">hpp</span></code>.
      </p>
<p>
        There is a patched <code class="computeroutput"><span class="identifier">invoke</span><span class="special">.</span><span class="identifier">hpp</span></code> posted
        on the C++-SIG mailing list archives and you can find a real implementation
        of all the machinery necessary to fully implement this in the TnFOX project
        at <a href="http://sourceforge.net/projects/tnfox/" target="_top">this</a> SourceForge
        project location.
      </p>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2002-2015 David
      Abrahams, Stefan Seefeld<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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