[issue19565] test_multiprocessing_spawn: RuntimeError and assertion error on windows xp buildbot

[STINNER Victor]

STINNER Victor added the comment:

"For Vista and later versions of Windows these warnings are presumably unnecessary since CancelIoEx() is used."

As close() on regular files, I would prefer to call explicitly cancel() to control exactly when the overlapped operation is cancelled. Can't you fix multiprocessing and/or the unit test to ensure that all overlapped operations are completed or cancelled?

close() does flush buffers and so may fail. Is it the same for CancelIo/CancelIoEx? In the official documentation, only one error case is described: "If this function cannot find a request to cancel, the return value is 0 (zero), and GetLastError returns ERROR_NOT_FOUND."

The warning is useful because it may be a real bug in the code. I also like ResourceWarning("unclosed file/socket ...") warnings.

----------

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19565>
_______________________________________