[issue14432] Bug in generator if the generator in created in a C thread
Andrew Suffield
report at bugs.python.org
Mon Apr 16 16:13:57 CEST 2012
Andrew Suffield <asuffield at suffields.me.uk> added the comment:
I think I've tripped over a variation on this theme using pyqt and 2.7:
When working in a QThread, the PyGILState_Ensure call when transitioning control from Qt to python will frequently allocate a new thread state - because every time control returns to the Qt event loop, gilstate_counter is likely to become zero.
If a generator is kept around longer than this, it becomes quite likely to have an older thread state in f_tstate. This happens all the time.
The access that blows up on me is PyEval_GetRestricted, since PyFrame_IsRestricted checks f_tstate. Annoyingly this debris is still called on the possibly-restricted operations even when restricted execution is nowhere in sight.
Hence, any use of open() in a long-lived generator in a QThread is probably going to crash.
Patch against 2.7?
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nosy: +asuffield
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