Stefan Krah <[email protected]> added the comment:
Well, the problem in b) is that data[:2] creates a new memoryview,
so the underlying ManagedBufferObject now has two exports:
- One from the context manager.
- The second from the slice.
So memoryview.__exit__() decrements on export, but the second one
is hanging.
This actually works as expected because the ManagedBufferObject
cannot know that it could also release the slice. That's what I
meant by saying that it's the application's responsibility to
release all views that are based on the context manager's view.
One way of doing so would be this:
with open(fn, 'rb') as fd:
with mmap.mmap(fd.fileno(), 0, access=mmap.ACCESS_READ) as mm:
with memoryview(mm) as data:
with data[:2] as theslice:
print(theslice)
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<https://bugs.python.org/issue35686>
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