Windows event coming through via db- put() call (very puzzling)

We have this problem (https://bugzilla.osafoundation.org/show_bug.cgi?id=11202) where if we run a DEBUG build of chandler after running a RELEASE build on Windows (XP or 2000), running db 4.5.20 or 4.6.21, we're getting a windows event call while inside a db->put() call. This so happens in a somewhat critical section of code where windows events are definitely not expected.
In no place that we can find are there any calls that we expect to tickle the Windows event loop (no yielding or somesuch). An MSVC stacktrace that doesn't even show any 'db' API to be on the stack at all. Yet, stepping through the python code in the python debugger clearly gets us to this error when stepping over the self._db.put() call which is more or less just a db->put() call in C.
We think that we've ruled out threading weirdness, only one thread is involved here.
Our wx engineer seems to remember having seen something about this strange interaction between Berkeley DB and wxWidgets before. Does this ring a bell ? Do you have any clues about what could be going on here ?
Thanks
Andi..

Berkeley DB windows port utilizes Windows' CreateEvent function to implement the lock functionality, which is a fundamental functionality for databases.
You do not have to protect berkeley db access methods for synchronization explicitly, rather, you should set DB_THREAD flag in the DB_ENV->open and DB->open funciton if the env and db handles are to be accessed by multiple thread of the same process, this way, Berkeley db will handle the synchronization internally

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Location/Ubicacion: Arizona USA
Time Zone/Hora Local: UTC/GMT -7
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Si esto mensaje le ha ayudado, por favor haga clic en "Aceptar como solución". Si encuentra un mensaje útil, por favor "Da Kudos" al final del mensaje, por lo que esta información puede beneficiar a otros.
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http://msdn.microsoft.com/en-us/library/windows/desktop/aa363648(v=vs.85).aspx
Edited by: Paul Fowler on Feb 21, 2013 9:45 AM

Thanks for sharing this information Paul.

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BigAndy wrote:
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