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multiprocessing: AttributeError: 'SimpleQueue' object has no attribute '_poll' #74487

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DanielMoore mannequin opened this issue May 7, 2017 · 7 comments
Closed

multiprocessing: AttributeError: 'SimpleQueue' object has no attribute '_poll' #74487

DanielMoore mannequin opened this issue May 7, 2017 · 7 comments
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3.7 (EOL) end of life OS-windows stdlib Python modules in the Lib dir type-bug An unexpected behavior, bug, or error

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@DanielMoore
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DanielMoore mannequin commented May 7, 2017

BPO 30301
Nosy @pfmoore, @tjguk, @zware, @serhiy-storchaka, @zooba, @applio, @zhangyangyu
PRs
  • bpo-30301: Fix AttributeError when using SimpleQueue.empty() under *spawn* and *forkserver* start methods #1601
  • [3.5] bpo-30301: Fix AttributeError when using SimpleQueue.empty() #1627
  • [3.6] bpo-30301: Fix AttributeError when using SimpleQueue.empty() #1628
    		•

    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 = None
closed_at = <Date 2017-05-17.14:06:16.744>
created_at = <Date 2017-05-07.19:01:50.828>
labels = ['3.7', 'type-bug', 'library', 'OS-windows']
title = "multiprocessing: AttributeError: 'SimpleQueue' object has no attribute '_poll'"
updated_at = <Date 2017-05-17.14:06:16.743>
user = 'https://bugs.python.org/DanielMoore'

    bugs.python.org fields:

    activity = <Date 2017-05-17.14:06:16.743>
actor = 'xiang.zhang'
assignee = 'none'
closed = True
closed_date = <Date 2017-05-17.14:06:16.744>
closer = 'xiang.zhang'
components = ['Library (Lib)', 'Windows']
creation = <Date 2017-05-07.19:01:50.828>
creator = 'Daniel Moore'
dependencies = []
files = []
hgrepos = []
issue_num = 30301
keywords = []
message_count = 7.0
messages = ['293209', '293753', '293774', '293838', '293850', '293853', '293854']
nosy_count = 8.0
nosy_names = ['paul.moore', 'tim.golden', 'zach.ware', 'serhiy.storchaka', 'steve.dower', 'davin', 'xiang.zhang', 'Daniel Moore']
pr_nums = ['1601', '1627', '1628']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue30301'
versions = ['Python 3.5', 'Python 3.6', 'Python 3.7']
    @DanielMoore
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    DanielMoore mannequin commented May 7, 2017

    I originally posted this as a question on StackOverflow thinking I was doing something wrong:

    http://stackoverflow.com/questions/43834494/python-3-6-attributeerror-simplequeue-object-has-no-attribute-poll/43835368#43835368

    But I think I found the solution and answered my own question. I'm pretty sure you need to set:

    self._poll = self._reader.poll

    in the __setstate__ method in the SimpleQueue class of queues.py from the multiprocessing library. Otherwise, I'd love to know an alternative solution.

    Thanks!

    @DanielMoore DanielMoore mannequin added type-crash A hard crash of the interpreter, possibly with a core dump stdlib Python modules in the Lib dir OS-windows labels May 7, 2017
    @vstinner vstinner changed the title “AttributeError: 'SimpleQueue' object has no attribute '_poll'” multiprocessing: AttributeError: 'SimpleQueue' object has no attribute '_poll' May 10, 2017
    @zhangyangyu
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    Related commit is bdb1cf1. A simple reproduce snippet:

    import multiprocessing as mp

def foo(q):
    q.put('hello')
    assert not q.empty()

if __name__ == '__main__':
    mp.set_start_method('spawn')
    q = mp.SimpleQueue()
    p = mp.Process(target=foo, args=(q,))
    p.start()
    print(q.get())
    p.join()

    @zhangyangyu zhangyangyu added 3.7 (EOL) end of life type-bug An unexpected behavior, bug, or error and removed type-crash A hard crash of the interpreter, possibly with a core dump labels May 16, 2017
    @serhiy-storchaka
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    LGTM. But can you convert the reproducer to a test?

    @zhangyangyu
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    Thanks for your reply Serhiy. Test added. :-)

    @zhangyangyu
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    New changeset 6f75bc0 by Xiang Zhang in branch 'master':
    bpo-30301: Fix AttributeError when using SimpleQueue.empty() (bpo-1601)
    6f75bc0

    @zhangyangyu
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    New changeset 9081b36 by Xiang Zhang in branch '3.5':
    bpo-30301: Fix AttributeError when using SimpleQueue.empty() (bpo-1601) (bpo-1627)
    9081b36

    @zhangyangyu
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    New changeset 43d4c03 by Xiang Zhang in branch '3.6':
    bpo-30301: Fix AttributeError when using SimpleQueue.empty() (bpo-1601) (bpo-1628)
    43d4c03

    @ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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