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>> Can't you fix multiprocessing and/or the unit test to ensure that all 
>> overlapped operations are completed or cancelled?
> On Vista and later, yes, this is done in the deallocator using
> CancelIoEx(), although there is still a warning.
I don't understand. The warning is emitted because an operating is not done nor cancelled. Why not cancel explicitly active operations in manager.shutdown()? It is not possible?
> ... I think these warnings come from daemon threads used by "manager"
> processes. When the manager process exits some background threads
> may be blocked doing an overlapped read.
I don't know overlapped operations. There are not asynchronous? What do you mean by "blocked doing an overlapped read"?