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test_logging: test_config_queue_handler() race condition #93761

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testsTests in the Lib/test dirtype-bugAn unexpected behavior, bug, or error
@vstinner

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@vstinner

The implementation of test_logging.test_config_queue_handler() uses time.sleep(0.010) as synchronization primitive.

@vsajip: please don't use time.sleep() as sync primitive:https://pythondev.readthedocs.io/unstable_tests.html#don-t-use-sleep-as-synchronization

The test fails when the machine is busy:

$ ./python -m test test_logging -m test_config_queue_handler -F -j10 -v(...)0:00:10 load avg: 2.36 [ 48/1] test_logging failed (1 failure)test_config_queue_handler (test.test_logging.ConfigDictTest.test_config_queue_handler) ... FAIL======================================================================FAIL: test_config_queue_handler (test.test_logging.ConfigDictTest.test_config_queue_handler)----------------------------------------------------------------------Traceback (most recent call last):  File "/home/vstinner/python/main/Lib/test/test_logging.py", line 3647, in test_config_queue_handler    self.do_queuehandler_configuration(qspec, lspec)    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  File "/home/vstinner/python/main/Lib/test/test_logging.py", line 3621, in do_queuehandler_configuration    self.assertEqual(data, ['foo', 'bar', 'baz'])    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^AssertionError: Lists differ: [] != ['foo', 'bar', 'baz']Second list contains 3 additional elements.First extra element 0:'foo'- []+ ['foo', 'bar', 'baz']----------------------------------------------------------------------Ran 1 test in 0.466sFAILED (failures=1)

Extract of the test:

        delay = 0.01        try:            self.apply_config(cd)            qh = logging.getHandlerByName('ah')            self.assertEqual(sorted(logging.getHandlerNames()), ['ah', 'h1'])            self.assertIsNotNone(qh.listener)            qh.listener.start()            # Need to let the listener thread get started            time.sleep(delay)            logging.debug('foo')            logging.info('bar')            logging.warning('baz')            # Need to let the listener thread finish its work            time.sleep(delay)            with open(fn, encoding='utf-8') as f:                data = f.read().splitlines()            self.assertEqual(data, ['foo', 'bar', 'baz'])        finally:            if qh:                qh.listener.stop()            h = logging.getHandlerByName('h1')            if h:                self.addCleanup(closeFileHandler, h, fn)            else:                self.addCleanup(os.remove, fn)

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