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235 lines
8.5 KiB
Python
235 lines
8.5 KiB
Python
import itertools
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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 operator import add
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from test import support
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from test.support import Py_GIL_DISABLED
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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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# Used in test_swallows_falsey_exceptions
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def raiser(exception, msg='std'):
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raise exception(msg)
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class FalseyBoolException(Exception):
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def __bool__(self):
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return False
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class FalseyLenException(Exception):
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def __len__(self):
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return 0
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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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with self.assertRaises(ZeroDivisionError):
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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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# gh-110097: On heavily loaded systems, the launch of the worker may
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# take longer than the specified timeout.
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self.assertIn(results, ([None, None], [None], []))
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def test_map_buffersize_type_validation(self):
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for buffersize in ("foo", 2.0):
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with self.subTest(buffersize=buffersize):
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with self.assertRaisesRegex(
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TypeError,
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"buffersize must be an integer or None",
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):
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self.executor.map(str, range(4), buffersize=buffersize)
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def test_map_buffersize_value_validation(self):
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for buffersize in (0, -1):
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with self.subTest(buffersize=buffersize):
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with self.assertRaisesRegex(
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ValueError,
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"buffersize must be None or > 0",
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):
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self.executor.map(str, range(4), buffersize=buffersize)
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def test_map_buffersize(self):
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ints = range(4)
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for buffersize in (1, 2, len(ints), len(ints) * 2):
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with self.subTest(buffersize=buffersize):
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res = self.executor.map(str, ints, buffersize=buffersize)
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self.assertListEqual(list(res), ["0", "1", "2", "3"])
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def test_map_buffersize_on_multiple_iterables(self):
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ints = range(4)
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for buffersize in (1, 2, len(ints), len(ints) * 2):
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with self.subTest(buffersize=buffersize):
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res = self.executor.map(add, ints, ints, buffersize=buffersize)
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self.assertListEqual(list(res), [0, 2, 4, 6])
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def test_map_buffersize_on_infinite_iterable(self):
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res = self.executor.map(str, itertools.count(), buffersize=2)
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self.assertEqual(next(res, None), "0")
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self.assertEqual(next(res, None), "1")
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self.assertEqual(next(res, None), "2")
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def test_map_buffersize_on_multiple_infinite_iterables(self):
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res = self.executor.map(
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add,
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itertools.count(),
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itertools.count(),
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buffersize=2
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)
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self.assertEqual(next(res, None), 0)
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self.assertEqual(next(res, None), 2)
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self.assertEqual(next(res, None), 4)
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def test_map_buffersize_on_empty_iterable(self):
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res = self.executor.map(str, [], buffersize=2)
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self.assertIsNone(next(res, None))
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def test_map_buffersize_without_iterable(self):
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res = self.executor.map(str, buffersize=2)
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self.assertIsNone(next(res, None))
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def test_map_buffersize_when_buffer_is_full(self):
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ints = iter(range(4))
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buffersize = 2
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self.executor.map(str, ints, buffersize=buffersize)
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self.executor.shutdown(wait=True) # wait for tasks to complete
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self.assertEqual(
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next(ints),
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buffersize,
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msg="should have fetched only `buffersize` elements from `ints`.",
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)
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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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def set_event():
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if Py_GIL_DISABLED:
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# gh-117688 Avoid deadlock by setting the event in a
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# background thread. The current thread may be in the middle
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# of the my_object_collected.wait() call, which holds locks
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# needed by my_object_collected.set().
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threading.Thread(target=my_object_collected.set).start()
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else:
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my_object_collected.set()
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my_object_callback = weakref.ref(my_object, lambda obj: set_event())
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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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if Py_GIL_DISABLED:
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# Due to biased reference counting, my_object might only be
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# deallocated while the thread that created it runs -- if the
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# thread is paused waiting on an event, it may not merge the
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# refcount of the queued object. For that reason, we alternate
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# between running the GC and waiting for the event.
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wait_time = 0
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collected = False
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while not collected and wait_time <= support.SHORT_TIMEOUT:
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support.gc_collect()
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collected = my_object_collected.wait(timeout=1.0)
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wait_time += 1.0
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else:
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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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for _ in support.sleeping_retry(support.SHORT_TIMEOUT):
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if wr() is None:
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break
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def test_swallows_falsey_exceptions(self):
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# see gh-132063: Prevent exceptions that evaluate as falsey
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# from being ignored.
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# Recall: `x` is falsey if `len(x)` returns 0 or `bool(x)` returns False.
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msg = 'boolbool'
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with self.assertRaisesRegex(FalseyBoolException, msg):
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self.executor.submit(raiser, FalseyBoolException, msg).result()
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msg = 'lenlen'
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with self.assertRaisesRegex(FalseyLenException, msg):
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self.executor.submit(raiser, FalseyLenException, msg).result()
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