[issue34434] Removal of kwargs for built-in types not covered with "changed in Python" note in documentation
Change by Louis Sautier : -- nosy: +sbraz nosy_count: 7.0 -> 8.0 pull_requests: +28201 pull_request: https://github.com/python/cpython/pull/29976 ___ Python tracker <https://bugs.python.org/issue34434> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue42114] Documentation of ctypes.CDLL does not correspond to code
Change by Louis Sautier : -- keywords: +patch nosy: +sbraz nosy_count: 1.0 -> 2.0 pull_requests: +28202 stage: -> patch review pull_request: https://github.com/python/cpython/pull/29976 ___ Python tracker <https://bugs.python.org/issue42114> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue43136] multiprocessing.Queue.get(block=False) can raise queue.Empty on non-empty queue
New submission from Louis Sautier :
Hello,
I have noticed that when multiple processes try to simultaneously get items
from a multiprocessing queue with block=False, it will raise queue.Empty even
though there are still items in it.
Adding a multiprocessing lock around calls to Queue.get fixes the problem.
Please consider the attached reproducer script and its output:
$ ./queue_test.py
using processes
2021-02-05T12:48:21.742728 worker 0 got 0, queue size was 100
2021-02-05T12:48:21.743702 worker 1 got 1, queue size was 99
2021-02-05T12:48:21.744059 worker 2 got 2, queue size was 98
2021-02-05T12:48:21.745352 worker 3 got 3, queue size was 97
2021-02-05T12:48:22.743905 worker 1 queue is EMPTY, size was 96
2021-02-05T12:48:22.744064 worker 0 got 4, queue size was 96
2021-02-05T12:48:22.746525 worker 3 queue is EMPTY, size was 95
2021-02-05T12:48:22.749573 worker 2 got 5, queue size was 95
2021-02-05T12:48:23.744474 worker 0 got 6, queue size was 94
2021-02-05T12:48:23.750728 worker 2 got 7, queue size was 93
2021-02-05T12:48:24.745852 worker 0 got 8, queue size was 92
2021-02-05T12:48:24.751827 worker 2 got 9, queue size was 91
[…]
I have been able to reproduce this problem with Python 2.7 and 3.5 through 3.9
(3.10 untested).
When using threads and queue.Queue instead of their multiprocessing
counterparts, the problem is not present ("./queue_test.py thread" → no
spurious exceptions until the queue is actually empty).
--
components: Library (Lib)
files: queue_test.py
messages: 386525
nosy: sbraz
priority: normal
severity: normal
status: open
title: multiprocessing.Queue.get(block=False) can raise queue.Empty on
non-empty queue
type: behavior
versions: Python 3.6, Python 3.7, Python 3.8, Python 3.9
Added file: https://bugs.python.org/file49791/queue_test.py
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[issue43136] multiprocessing.Queue.get(block=False) can raise queue.Empty on non-empty queue
Change by Louis Sautier : -- nosy: +mdk ___ Python tracker <https://bugs.python.org/issue43136> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue34434] Removal of kwargs for built-in types not covered with "changed in Python" note in documentation
Change by Louis Sautier : -- keywords: +patch pull_requests: +8320 stage: -> patch review ___ Python tracker <https://bugs.python.org/issue34434> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue25434] Fix typo in whatsnew/3.5
New submission from Louis Sautier: Hi, I noticed a typo in the doc for What’s New In Python 3.5, here's a patch. -- assignee: docs@python components: Documentation files: fixtypo.patch keywords: patch messages: 253155 nosy: docs@python, omelette priority: normal severity: normal status: open title: Fix typo in whatsnew/3.5 versions: Python 3.5 Added file: http://bugs.python.org/file40811/fixtypo.patch ___ Python tracker <http://bugs.python.org/issue25434> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
