Nick Coghlan <ncogh...@gmail.com> added the comment:

Oops, Antoine's right, the release() semantics in the patch are broken, albeit 
for the precisely opposite reasons: that example will actually blow up with 
BufferError inside some_library_function().

I withdraw my objection - Antoine's right that release() on a memoryview object 
has to just mean "drop the reference to the ManagedBuffer instance". Calling 
release() when there are actual *exported* buffers outstanding should still 
trigger BufferError though (slices and copies don't count in that case, as 
they'll have their own independent references to the ManagedBuffer instance).

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue10181>
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