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[3.8] bpo-38377: Fix skip_if_broken_multiprocessing_synchronize() on macOS (GH-20984) #20988

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Merged
miss-islington merged 1 commit into from
Jun 19, 2020
Merged

[3.8] bpo-38377: Fix skip_if_broken_multiprocessing_synchronize() on macOS (GH-20984) #20988

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17 changes: 9 additions & 8 deletions Lib/test/support/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3383,7 +3383,7 @@ def skip_if_broken_multiprocessing_synchronize():
"""
Skip tests if the multiprocessing.synchronize module is missing, if there
is no available semaphore implementation, or if creating a lock raises an
OSError.
OSError (on Linux only).
"""

# Skip tests if the _multiprocessing extension is missing.
Expand All @@ -3393,10 +3393,11 @@ def skip_if_broken_multiprocessing_synchronize():
# multiprocessing.synchronize requires _multiprocessing.SemLock.
synchronize = import_module('multiprocessing.synchronize')

try:
# bpo-38377: On Linux, creating a semaphore is the current user
# does not have the permission to create a file in /dev/shm.
# Create a semaphore to check permissions.
synchronize.Lock(ctx=None)
except OSError as exc:
raise unittest.SkipTest(f"broken multiprocessing SemLock: {exc!r}")
if sys.platform == "linux":
try:
# bpo-38377: On Linux, creating a semaphore fails with OSError
# if the current user does not have the permission to create
# a file in /dev/shm/ directory.
synchronize.Lock(ctx=None)
except OSError as exc:
raise unittest.SkipTest(f"broken multiprocessing SemLock: {exc!r}")