[Python-checkins] bpo-38377: Fix skip_if_broken_multiprocessing_synchronize() on macOS (GH-20984)

[Victor Stinner]

https://github.com/python/cpython/commit/3358da4054b9b0b045eb47dc74dee3d58bfbb1d5
commit: 3358da4054b9b0b045eb47dc74dee3d58bfbb1d5
branch: master
author: Victor Stinner <vstinner at python.org>
committer: GitHub <noreply at github.com>
date: 2020-06-19T18:01:20+02:00
summary:

bpo-38377: Fix skip_if_broken_multiprocessing_synchronize() on macOS (GH-20984)

skip_if_broken_multiprocessing_synchronize() only attempts for create
a semaphore on Linux to fix multiprocessing
test_resource_tracker_reused() on macOS.

files:
M Lib/test/support/__init__.py

diff --git a/Lib/test/support/__init__.py b/Lib/test/support/__init__.py
index d9dbdc13008dc..bceb8cda20c35 100644
--- a/Lib/test/support/__init__.py
+++ b/Lib/test/support/__init__.py
@@ -1962,7 +1962,7 @@ 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.
@@ -1972,10 +1972,11 @@ 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}")