[New-bugs-announce] [issue28668] instanciation of multiprocessing.Queue raises ImportError in test_logging

[Xavier de Gaye]

New submission from Xavier de Gaye:

Occurs on Android that has a broken shared semaphore implementation (issue 26924).
Patch attached.

One of the backtraces:

======================================================================
ERROR: test_handle_called_with_mp_queue (test.test_logging.QueueListenerTest)
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Traceback (most recent call last):
  File "/sdcard/org.bitbucket.pyona/lib/python3.7/multiprocessing/synchronize.py", line 29, in <modu
le>
    from _multiprocessing import SemLock, sem_unlink
ImportError: cannot import name 'sem_unlink'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/sdcard/org.bitbucket.pyona/lib/python3.7/unittest/mock.py", line 1179, in patched
    return func(*args, **keywargs)
  File "/sdcard/org.bitbucket.pyona/lib/python3.7/test/test_logging.py", line 3130, in test_handle_c
alled_with_mp_queue
    log_queue = multiprocessing.Queue()
  File "/sdcard/org.bitbucket.pyona/lib/python3.7/multiprocessing/context.py", line 102, in Queue
    return Queue(maxsize, ctx=self.get_context())
  File "/sdcard/org.bitbucket.pyona/lib/python3.7/multiprocessing/queues.py", line 39, in __init__
    from .synchronize import SEM_VALUE_MAX as maxsize
  File "/sdcard/org.bitbucket.pyona/lib/python3.7/multiprocessing/synchronize.py", line 34, in <modu
le>
    " function, see issue 3770.")
ImportError: This platform lacks a functioning sem_open implementation, therefore, the required sync
hronization primitives needed will not function, see issue 3770.

----------
components: Tests
files: test__multiprocessing_queue.patch
keywords: patch
messages: 280589
nosy: vinay.sajip, xdegaye
priority: normal
severity: normal
stage: patch review
status: open
title: instanciation of multiprocessing.Queue raises ImportError in test_logging
type: behavior
versions: Python 3.5, Python 3.6, Python 3.7
Added file: http://bugs.python.org/file45448/test__multiprocessing_queue.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28668>
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