[issue14881] multiprocessing.dummy craches when self._parent._children does not exist

2013-10-18 Thread Andres Riancho 

Andres Riancho added the comment:

Is this a duplicate for http://bugs.python.org/issue10015
#10015 ?

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[issue14881] multiprocessing.dummy craches when self._parent._children does not exist

2013-10-18 Thread Terry J. Reedy 

Terry J. Reedy added the comment:

Since this is already fixed and closed, the question is more relevant to #10015 
and whether it should be closed. The answer seems to be yes.

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[issue14881] multiprocessing.dummy craches when self._parent._children does not exist

2013-10-18 Thread Terry J. Reedy 

Terry J. Reedy added the comment:

By the way, thanks for noticing, so it *can* be closed.

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[issue14881] multiprocessing.dummy craches when self._parent._children does not exist

2012-05-25 Thread Roundup Robot 

Roundup Robot devn...@psf.upfronthosting.co.za added the comment:

New changeset 1f5d2642929a by Richard Oudkerk in branch '2.7':
Issue #14881: Allow normal non-main thread to spawn a dummy process
http://hg.python.org/cpython/rev/1f5d2642929a

New changeset 0528ec18e230 by Richard Oudkerk in branch '3.2':
Issue #14881: Allow normal non-main thread to spawn a dummy process
http://hg.python.org/cpython/rev/0528ec18e230

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[issue14881] multiprocessing.dummy craches when self._parent._children does not exist

2012-05-25 Thread Terry J. Reedy 

Changes by Terry J. Reedy tjre...@udel.edu:


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[issue14881] multiprocessing.dummy craches when self._parent._children does not exist

2012-05-25 Thread Terry J. Reedy 

Terry J. Reedy tjre...@udel.edu added the comment:

3.3 commit is http://hg.python.org/cpython/rev/9373ca8c6c55
Richard, it did not record here because you just said 'Merge' rather than 
#14881 merge ;-).
Great to see a crasher fixed. Ready to close?

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[issue14881] multiprocessing.dummy craches when self._parent._children does not exist

2012-05-25 Thread Richard Oudkerk 

Richard Oudkerk shibt...@gmail.com added the comment:

I'll, remember that in future;-)

Closing.

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resolution:  - fixed
stage:  - committed/rejected
status: open - closed
type: crash - behavior

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[issue14881] multiprocessing.dummy craches when self._parent._children does not exist

2012-05-22 Thread Itay Brandes 

New submission from Itay Brandes akari...@gmail.com:

multiprocessing.dummy crashes when attempting to create a ThreadPool from a 
Thread.

The following code will crush on 2.7.3:

import multiprocessing.dummy
import threading
 
class Worker(threading.Thread):
def __init__(self):
threading.Thread.__init__(self)
 
def run(self):
poll = multiprocessing.dummy.Pool(5)
print str(poll)
 
w = Worker()
w.start()

will crush with the following traceback:

poll = multiprocessing.dummy.Pool(5)
  File C:\Python27\lib\multiprocessing\dummy\__init__.py, line 150, in Pool
return ThreadPool(processes, initializer, initargs)
  File C:\Python27\lib\multiprocessing\pool.py, line 685, in __init__
Pool.__init__(self, processes, initializer, initargs)
  File C:\Python27\lib\multiprocessing\pool.py, line 136, in __init__
self._repopulate_pool()
  File C:\Python27\lib\multiprocessing\pool.py, line 199, in _repopulate_pool
w.start()
  File C:\Python27\lib\multiprocessing\dummy\__init__.py, line 73, in start
self._parent._children[self] = None
AttributeError: 'Worker' object has no attribute '_children'

If you have access to the thread itself, you can set the _children attribute 
youself (w._children = weakref.WeakKeyDictionary()), but it is not possible 
with threads different from threading.thread (Such as PyQt4's QThread thread, 
which is essential for GUI programming).

The fix that I found is to edit the 
Python27\Lib\multiprocessing\dummy\__init__.py file. The crashing code is line 
number 73.
This line should be nested in an if block:

if hasattr(self._parent, '_children'):
self._parent._children[self] = None

That way the code is fixed.
Thanks!

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messages: 161339
nosy: Itay.Brandes
priority: normal
severity: normal
status: open
title: multiprocessing.dummy craches when self._parent._children does not exist
type: crash
versions: Python 2.7

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[issue14881] multiprocessing.dummy craches when self._parent._children does not exist

2012-05-22 Thread Itay Brandes 

Changes by Itay Brandes akari...@gmail.com:


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[issue14881] multiprocessing.dummy craches when self._parent._children does not exist

2012-05-22 Thread Richard Oudkerk 

Changes by Richard Oudkerk shibt...@gmail.com:


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