From 1529322ca6b7b029af65aceeb04e6d47013eeeb4 Mon Sep 17 00:00:00 2001 From: "Miss Islington (bot)" <31488909+miss-islington@users.noreply.github.com> Date: Fri, 19 Jun 2020 09:20:15 -0700 Subject: [PATCH] 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. (cherry picked from commit 3358da4054b9b0b045eb47dc74dee3d58bfbb1d5) Co-authored-by: Victor Stinner --- Lib/test/support/__init__.py | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/Lib/test/support/__init__.py b/Lib/test/support/__init__.py index 28738daab25..9fad3f0218a 100644 --- a/Lib/test/support/__init__.py +++ b/Lib/test/support/__init__.py @@ -3174,7 +3174,7 @@ 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. @@ -3184,10 +3184,11 @@ 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}")