mirror of https://github.com/python/cpython
131 lines
4.7 KiB
Python
131 lines
4.7 KiB
Python
import threading
|
|
import time
|
|
import weakref
|
|
from concurrent import futures
|
|
from test import support
|
|
from test.support import Py_GIL_DISABLED
|
|
|
|
|
|
def mul(x, y):
|
|
return x * y
|
|
|
|
def capture(*args, **kwargs):
|
|
return args, kwargs
|
|
|
|
|
|
class MyObject(object):
|
|
def my_method(self):
|
|
pass
|
|
|
|
|
|
def make_dummy_object(_):
|
|
return MyObject()
|
|
|
|
|
|
class ExecutorTest:
|
|
# Executor.shutdown() and context manager usage is tested by
|
|
# ExecutorShutdownTest.
|
|
def test_submit(self):
|
|
future = self.executor.submit(pow, 2, 8)
|
|
self.assertEqual(256, future.result())
|
|
|
|
def test_submit_keyword(self):
|
|
future = self.executor.submit(mul, 2, y=8)
|
|
self.assertEqual(16, future.result())
|
|
future = self.executor.submit(capture, 1, self=2, fn=3)
|
|
self.assertEqual(future.result(), ((1,), {'self': 2, 'fn': 3}))
|
|
with self.assertRaises(TypeError):
|
|
self.executor.submit(fn=capture, arg=1)
|
|
with self.assertRaises(TypeError):
|
|
self.executor.submit(arg=1)
|
|
|
|
def test_map(self):
|
|
self.assertEqual(
|
|
list(self.executor.map(pow, range(10), range(10))),
|
|
list(map(pow, range(10), range(10))))
|
|
|
|
self.assertEqual(
|
|
list(self.executor.map(pow, range(10), range(10), chunksize=3)),
|
|
list(map(pow, range(10), range(10))))
|
|
|
|
def test_map_exception(self):
|
|
i = self.executor.map(divmod, [1, 1, 1, 1], [2, 3, 0, 5])
|
|
self.assertEqual(i.__next__(), (0, 1))
|
|
self.assertEqual(i.__next__(), (0, 1))
|
|
self.assertRaises(ZeroDivisionError, i.__next__)
|
|
|
|
@support.requires_resource('walltime')
|
|
def test_map_timeout(self):
|
|
results = []
|
|
try:
|
|
for i in self.executor.map(time.sleep,
|
|
[0, 0, 6],
|
|
timeout=5):
|
|
results.append(i)
|
|
except futures.TimeoutError:
|
|
pass
|
|
else:
|
|
self.fail('expected TimeoutError')
|
|
|
|
self.assertEqual([None, None], results)
|
|
|
|
def test_shutdown_race_issue12456(self):
|
|
# Issue #12456: race condition at shutdown where trying to post a
|
|
# sentinel in the call queue blocks (the queue is full while processes
|
|
# have exited).
|
|
self.executor.map(str, [2] * (self.worker_count + 1))
|
|
self.executor.shutdown()
|
|
|
|
@support.cpython_only
|
|
def test_no_stale_references(self):
|
|
# Issue #16284: check that the executors don't unnecessarily hang onto
|
|
# references.
|
|
my_object = MyObject()
|
|
my_object_collected = threading.Event()
|
|
def set_event():
|
|
if Py_GIL_DISABLED:
|
|
# gh-117688 Avoid deadlock by setting the event in a
|
|
# background thread. The current thread may be in the middle
|
|
# of the my_object_collected.wait() call, which holds locks
|
|
# needed by my_object_collected.set().
|
|
threading.Thread(target=my_object_collected.set).start()
|
|
else:
|
|
my_object_collected.set()
|
|
my_object_callback = weakref.ref(my_object, lambda obj: set_event())
|
|
# Deliberately discarding the future.
|
|
self.executor.submit(my_object.my_method)
|
|
del my_object
|
|
|
|
if Py_GIL_DISABLED:
|
|
# Due to biased reference counting, my_object might only be
|
|
# deallocated while the thread that created it runs -- if the
|
|
# thread is paused waiting on an event, it may not merge the
|
|
# refcount of the queued object. For that reason, we alternate
|
|
# between running the GC and waiting for the event.
|
|
wait_time = 0
|
|
collected = False
|
|
while not collected and wait_time <= support.SHORT_TIMEOUT:
|
|
support.gc_collect()
|
|
collected = my_object_collected.wait(timeout=1.0)
|
|
wait_time += 1.0
|
|
else:
|
|
collected = my_object_collected.wait(timeout=support.SHORT_TIMEOUT)
|
|
self.assertTrue(collected,
|
|
"Stale reference not collected within timeout.")
|
|
|
|
def test_max_workers_negative(self):
|
|
for number in (0, -1):
|
|
with self.assertRaisesRegex(ValueError,
|
|
"max_workers must be greater "
|
|
"than 0"):
|
|
self.executor_type(max_workers=number)
|
|
|
|
def test_free_reference(self):
|
|
# Issue #14406: Result iterator should not keep an internal
|
|
# reference to result objects.
|
|
for obj in self.executor.map(make_dummy_object, range(10)):
|
|
wr = weakref.ref(obj)
|
|
del obj
|
|
support.gc_collect() # For PyPy or other GCs.
|
|
self.assertIsNone(wr())
|