[issue3046] Locking should be removed from the new buffer protocol

[Stefan Behnel]

Stefan Behnel <scoder at users.sourceforge.net> added the comment:

Here is a patch that removes all occurrences of the locking protocol
from the current py3k branch code base.

There are still some issues in memoryobject.c:

- there was an occurrence of PyBUF_SHADOW that might have to be handled

- memory_getbuf and memory_releasebuf must be reimplemented as it is no
longer allowed to call getbuffer/releasebuffer with a NULL pointer

Added file: http://bugs.python.org/file10534/buffer-no-locking.patch

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