On Tue, Mar 15, 2011 at 06:34:27PM +0000, Jon TURNEY wrote: > >I've come across a problem whilst trying to run the twisted test suite, where >some tests just cause python to segfault. It seems to be the same issue with >libcrypto as reported in [2],[3] > >A small test case is attached to [2] as cygwin_crash.zip, referred to in >msg76086, which shows that manipulating a semaphore in >DllMain(DLL_THREAD_DETACH) causes a crash. > >There is a patch for openssl attached to [1] which makes sense to me. Surely >the cleanup ERR_remove_state() does should be requested using >pthread_cleanup_push() rather using DllMain(DLL_THREAD_DETACH)? But that >doesn't seem to be done for any other POSIX target. The documentation of >ERR_remove_state() gives me the impression that it expects the application to >arrange for that to happen, so perhaps it's just trying too hard to be >helpful here? > >I suppose the alternative interpretation is that you are supposed to be able >to call anything you like from DllMain(DLL_THREAD_DETACH), then this is a >cygwin bug. But I can't see how that could be made work as pthread::exit() has >to delete the cygwin thread object before ExitThread() is called, as there's >no thread to do it in afterwards :-)
Actually you aren't supposed to be able to call anything you like here and it isn't clear why a POSIX/UNIX/Linux program would be relying on DllMain. cgf -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
