Possible thread related problem with Xapian bindings

[richard]

I have a test case which repeatedly tries to open (the same) xapian database from multiple threads, checking for thread related problems. It usually fails with a segmentation fault. Occasionally, this failure is preceded by an error message stating "Fatal Python error: GC object already tracked". Occasionally, it completes successfully.

[richard]

Sample script demonstrating the failure

[richard]

I believe that this is fixed in revision 8920. There was a problem in the Python bindings - specifically, the GIL was not being re-acquired when an exception was thrown before setting the Python exception state. This was causing various memory corruption symptoms. Fixed by explicitly calling SWIG_PYTHON_THREAD_END_ALLOW() in the catch() clause (except for directory classes); this is a bit ugly, but I can't see how SWIG could be fixed to do this automatically, since it doesn't know what's going on in the "exception" clause.

[richard]

Fix is in upcoming 1.0.2 release.