Hello *,<div><br></div><div>I face some issue with sporadic crashes in xpressive which I think a result of a race condition. The use case is:</div><div><br></div><div>a function which needs to parse smth create local regex objects:</div>

<div><br></div><div><div>  const sregex any_char = _;</div><div>  sregex const&amp; rdelim = parser_-&gt;delimiter(); //some dynamic delimiter token</div><div><br></div><div>  const sregex re_prefix</div><div>    = bos </div>

<div>    &gt;&gt; (s1=-*by_ref(any_char))</div><div>    &gt;&gt; *(s2=by_ref(rdelim))</div><div>    &gt;&gt; eos</div><div>  ;</div></div><div><br></div><div>calling this function from multiple threads results in a crash with (boost 1.42, gcc 4.3.5 on debian linux). I previously had more crashes, but moved all</div>

<div>regex objects to global space as const objects and they seem to be fine now. This is the only place I left with a local regex.</div><div><br></div><div>In the stack trace it seems like internals of the local object regex are freed via boost weak_ptr with possible double delete attempt.</div>

<div><br></div><div>The stack-trace of the created core-dump during the crash can be accessed via:</div><div><a href="https://docs.google.com/open?id=0BzJl1eEH-CCGODU5N2JhOTAtNWMxMy00OGNhLThhNzctNWQ4OWJlOGFkOTdk">https://docs.google.com/open?id=0BzJl1eEH-CCGODU5N2JhOTAtNWMxMy00OGNhLThhNzctNWQ4OWJlOGFkOTdk</a></div>

<div>(Did not want to send addional 200k to the mailing list.)</div><div><br></div><div>Many thanks for help,</div><div>Ovanes</div><div><div><br></div></div>