futures.ProcessPoolExecutor hangs

[pclinch]

BPO	11161
Nosy	@brianquinlan

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/brianquinlan'
closed_at = <Date 2013-10-25.17:53:53.110>
created_at = <Date 2011-02-09.18:03:18.523>
labels = ['type-bug', 'docs']
title = 'futures.ProcessPoolExecutor hangs'
updated_at = <Date 2013-10-26.19:12:18.410>
user = 'https://bugs.python.org/pclinch'

bugs.python.org fields:

activity = <Date 2013-10-26.19:12:18.410>
actor = 'berker.peksag'
assignee = 'bquinlan'
closed = True
closed_date = <Date 2013-10-25.17:53:53.110>
closer = 'bquinlan'
components = ['Documentation']
creation = <Date 2011-02-09.18:03:18.523>
creator = 'pclinch'
dependencies = []
files = []
hgrepos = []
issue_num = 11161
keywords = []
message_count = 3.0
messages = ['128228', '128241', '201266']
nosy_count = 3.0
nosy_names = ['bquinlan', 'pclinch', 'python-dev']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue11161'
versions = ['Python 3.4']

[pclinch]

The example 16.4.3.1. ProcessPoolExecutor Example hangs in IDLE silently, and hangs the interactive python shell with AttributeError: 'module' object has no attribute 'is_prime'.

is_prime(9) was tested before running.

Platform is windows XP.

c:\Python32\python.exe -m test.test_concurrent_futures

passes all tests.

[brianquinlan]

ProcessPoolExecutor is not expected to work with any interactive shell on Windows because it uses the multiprocessing module behind the scenes, which has that limitation.

I'm reclassifying this as a documentation bug since either a reference to http://docs.python.org/dev/library/multiprocessing.html#programming-guidelines should appear in the futures docs or (better) the content should be rewritten specifically for ProcessPoolExecutor.

[python-dev]

New changeset 44b69e95d276 by bquinlan in branch 'default':
Issue bpo-11161: Update the documentation for ProcessPoolExecutor to note that it will not work in the interactive shell.
http://hg.python.org/cpython/rev/44b69e95d276