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Diffstat (limited to 'Lib/test/_test_multiprocessing.py')
| -rw-r--r-- | Lib/test/_test_multiprocessing.py | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/Lib/test/_test_multiprocessing.py b/Lib/test/_test_multiprocessing.py index 2fe0def2bcd..8269b879eb9 100644 --- a/Lib/test/_test_multiprocessing.py +++ b/Lib/test/_test_multiprocessing.py @@ -3719,6 +3719,30 @@ class _TestSharedMemory(BaseTestCase): self.assertLess(same_sms.size, 20*sms.size) # Size was ignored. same_sms.close() + # Creating Shared Memory Segment with -ve size + with self.assertRaises(ValueError): + shared_memory.SharedMemory(create=True, size=-2) + + # Attaching Shared Memory Segment without a name + with self.assertRaises(ValueError): + shared_memory.SharedMemory(create=False) + + # Test if shared memory segment is created properly, + # when _make_filename returns an existing shared memory segment name + with unittest.mock.patch( + 'multiprocessing.shared_memory._make_filename') as mock_make_filename: + + names = ['test01_fn', 'test02_fn'] + mock_make_filename.side_effect = names + shm1 = shared_memory.SharedMemory(create=True, size=1) + self.addCleanup(shm1.unlink) + self.assertEqual(shm1.name, names[0]) + + mock_make_filename.side_effect = names + shm2 = shared_memory.SharedMemory(create=True, size=1) + self.addCleanup(shm2.unlink) + self.assertEqual(shm2.name, names[1]) + if shared_memory._USE_POSIX: # Posix Shared Memory can only be unlinked once. Here we # test an implementation detail that is not observed across |