mirror of https://github.com/python/cpython
109 lines
3.6 KiB
Python
109 lines
3.6 KiB
Python
import threading
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import time
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import weakref
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from concurrent import futures
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from test import support
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def mul(x, y):
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return x * y
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def capture(*args, **kwargs):
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return args, kwargs
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class MyObject(object):
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def my_method(self):
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pass
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def make_dummy_object(_):
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return MyObject()
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class ExecutorTest:
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# Executor.shutdown() and context manager usage is tested by
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# ExecutorShutdownTest.
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def test_submit(self):
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future = self.executor.submit(pow, 2, 8)
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self.assertEqual(256, future.result())
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def test_submit_keyword(self):
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future = self.executor.submit(mul, 2, y=8)
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self.assertEqual(16, future.result())
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future = self.executor.submit(capture, 1, self=2, fn=3)
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self.assertEqual(future.result(), ((1,), {'self': 2, 'fn': 3}))
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with self.assertRaises(TypeError):
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self.executor.submit(fn=capture, arg=1)
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with self.assertRaises(TypeError):
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self.executor.submit(arg=1)
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def test_map(self):
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self.assertEqual(
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list(self.executor.map(pow, range(10), range(10))),
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list(map(pow, range(10), range(10))))
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self.assertEqual(
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list(self.executor.map(pow, range(10), range(10), chunksize=3)),
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list(map(pow, range(10), range(10))))
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def test_map_exception(self):
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i = self.executor.map(divmod, [1, 1, 1, 1], [2, 3, 0, 5])
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self.assertEqual(i.__next__(), (0, 1))
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self.assertEqual(i.__next__(), (0, 1))
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self.assertRaises(ZeroDivisionError, i.__next__)
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@support.requires_resource('walltime')
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def test_map_timeout(self):
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results = []
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try:
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for i in self.executor.map(time.sleep,
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[0, 0, 6],
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timeout=5):
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results.append(i)
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except futures.TimeoutError:
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pass
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else:
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self.fail('expected TimeoutError')
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self.assertEqual([None, None], results)
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def test_shutdown_race_issue12456(self):
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# Issue #12456: race condition at shutdown where trying to post a
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# sentinel in the call queue blocks (the queue is full while processes
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# have exited).
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self.executor.map(str, [2] * (self.worker_count + 1))
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self.executor.shutdown()
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@support.cpython_only
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def test_no_stale_references(self):
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# Issue #16284: check that the executors don't unnecessarily hang onto
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# references.
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my_object = MyObject()
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my_object_collected = threading.Event()
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my_object_callback = weakref.ref(
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my_object, lambda obj: my_object_collected.set())
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# Deliberately discarding the future.
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self.executor.submit(my_object.my_method)
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del my_object
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collected = my_object_collected.wait(timeout=support.SHORT_TIMEOUT)
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self.assertTrue(collected,
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"Stale reference not collected within timeout.")
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def test_max_workers_negative(self):
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for number in (0, -1):
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with self.assertRaisesRegex(ValueError,
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"max_workers must be greater "
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"than 0"):
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self.executor_type(max_workers=number)
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def test_free_reference(self):
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# Issue #14406: Result iterator should not keep an internal
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# reference to result objects.
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for obj in self.executor.map(make_dummy_object, range(10)):
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wr = weakref.ref(obj)
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del obj
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support.gc_collect() # For PyPy or other GCs.
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self.assertIsNone(wr())
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