[New-bugs-announce] [issue7095] Multiprocessing.Array(lock=False) fails
schlesin
report at bugs.python.org
Sat Oct 10 01:13:18 CEST 2009
New submission from schlesin <schlesin at cshl.edu>:
The documentation for the Multiprocessing.Array says:
multiprocessing.Array(typecode_or_type, size_or_initializer, *,
lock=True)¶
...
If lock is False then access to the returned object will not be
automatically protected by a lock, so it will not necessarily be
“process-safe”.
...
However:
In [48]: mp.Array('i',1,lock=False)
---------------------------------------------------------------------------
AssertionError Traceback (most recent call
last)
/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/
multiprocessing/__init__.pyc in Array(typecode_or_type,
size_or_initializer, **kwds)
252 '''
253 from multiprocessing.sharedctypes import Array
--> 254 return Array(typecode_or_type, size_or_initializer,
**kwds)
255
256 #
/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/
multiprocessing/sharedctypes.pyc in Array(typecode_or_type,
size_or_initializer, **kwds)
85 if lock is None:
86 lock = RLock()
---> 87 assert hasattr(lock, 'acquire')
88 return synchronized(obj, lock)
89
AssertionError:
-------
I.e. it looks like lock=False is not actually supported.
----------
components: Extension Modules
messages: 93812
nosy: schlesin
severity: normal
status: open
title: Multiprocessing.Array(lock=False) fails
type: behavior
versions: Python 2.6
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<http://bugs.python.org/issue7095>
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