Prevent errors caused by unregistering memory twice. #27
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At the time of python program exit, the registry.cleanup() method may be called before the remaining MPIShared objects are deleted. Check that a shared memory buffer exists in the registry before trying to free it.
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At the time of python program exit, the registry.cleanup() method may be called before the remaining MPIShared objects are deleted. Check that a shared memory buffer exists in the registry before trying to free it.