[issue12957] mmap.resize changes memory address of mmap'd region

[Mark Lawrence]

Change by Mark Lawrence :


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nosy:  -BreamoreBoy

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[issue12957] mmap.resize changes memory address of mmap'd region

[Mark Lawrence]

Mark Lawrence added the comment:

@Michael can you provide a patch to this effect?

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nosy: +BreamoreBoy
versions: +Python 3.5 -Python 3.3

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[issue12957] mmap.resize changes memory address of mmap'd region

[Christian Heimes]

Changes by Christian Heimes :


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stage:  -> needs patch
versions: +Python 3.3, Python 3.4

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[issue12957] mmap.resize changes memory address of mmap'd region

[Alex Gaynor]

Changes by Alex Gaynor :


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nosy: +alex

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[issue12957] mmap.resize changes memory address of mmap'd region

[Michael Schurter]

New submission from Michael Schurter :

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..from_buffer(), 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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