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Showing content from https://mail.python.org/pipermail/python-dev/2002-July/027141.html below:

[Python-Dev] PEP 298 - the Fixed Buffer Interface

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> Additional Notes/Comments
> 
>     Python strings, Unicode strings, mmap objects, and maybe other
>     types would expose the fixed buffer interface, but the array type
>     would *not*, because its memory block may be reallocated during
>     its lifetime.
> 
Unfortunately it's impossible to implement the fixed buffer interface
on mmap objects - the memory mapped file can be closed at any time.
This would leave the pointers unusable.

It seems this is another use case for locking - if we want it.

Thomas

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