New submission from Michael Schurter <m...@schmichael.com>:

Since mmap.resize uses MREMAP_MAYMOVE on Linux, it would be nice to warn users 
that pointers into their memory mapped regions will be invalid after resizes. 
Linux's manpage offers the following explanation:

"If the mapping is relocated, then absolute pointers into the old mapping 
location become invalid (offsets relative to the starting address of the 
mapping should be employed)."

Since the only way I know of to use pointers into mmaps from pure Python is to 
use ctypes.<type>.from_buffer(<mmap>), perhaps clarification would be better in 
the ctypes docs.

----------
assignee: docs@python
components: Documentation
files: killctypes.py
messages: 143845
nosy: docs@python, schmichael
priority: normal
severity: normal
status: open
title: mmap.resize changes memory address of mmap'd region
type: feature request
versions: Python 2.7
Added file: http://bugs.python.org/file23126/killctypes.py

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<http://bugs.python.org/issue12957>
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