Richard Oudkerk added the comment:
> We can consider two options then:
> 1) A multiprocessing specific fix. Removing this handle close gil
> release (which is superfluous, since these calls aren't blocking in any
> real sense) will certainly remove _this_ instance of the crash. An
> alternative is to make this worker thread non-daemon. That shouldn't
> be too hard and shouldn't have any other side effects.
Have you tried doing
p = Pool()
try:
...
finally:
p.close() # or perhaps p.terminate()
p.join()
Actually, making the worker thread non-daemonic is not so simple. This is
because there is no way to interrupt a background thread which is blocked doing
IO (unless you use multiplexing which is not possible with non-overlapped
pipes).
One can try to unblock such background threads by reading/writing messages
from/to the result/task pipe, but it not straightforward.
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<http://bugs.python.org/issue17969>
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