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import sys
import threading
import unittest
from concurrent import futures
from test import support
from test.support import threading_helper
from .util import (
CANCELLED_FUTURE, CANCELLED_AND_NOTIFIED_FUTURE, EXCEPTION_FUTURE,
SUCCESSFUL_FUTURE,
create_executor_tests, setup_module,
BaseTestCase, ThreadPoolMixin,
ProcessPoolForkMixin, ProcessPoolForkserverMixin, ProcessPoolSpawnMixin)
def mul(x, y):
return x * y
def wait_and_raise(e):
e.wait()
raise Exception('this is an exception')
class WaitTests:
def test_20369(self):
# See https://bugs.python.org/issue20369
future = self.executor.submit(mul, 1, 2)
done, not_done = futures.wait([future, future],
return_when=futures.ALL_COMPLETED)
self.assertEqual({future}, done)
self.assertEqual(set(), not_done)
def test_first_completed(self):
event = self.create_event()
future1 = self.executor.submit(mul, 21, 2)
future2 = self.executor.submit(event.wait)
try:
done, not_done = futures.wait(
[CANCELLED_FUTURE, future1, future2],
return_when=futures.FIRST_COMPLETED)
self.assertEqual(set([future1]), done)
self.assertEqual(set([CANCELLED_FUTURE, future2]), not_done)
finally:
event.set()
future2.result() # wait for job to finish
def test_first_completed_some_already_completed(self):
event = self.create_event()
future1 = self.executor.submit(event.wait)
try:
finished, pending = futures.wait(
[CANCELLED_AND_NOTIFIED_FUTURE, SUCCESSFUL_FUTURE, future1],
return_when=futures.FIRST_COMPLETED)
self.assertEqual(
set([CANCELLED_AND_NOTIFIED_FUTURE, SUCCESSFUL_FUTURE]),
finished)
self.assertEqual(set([future1]), pending)
finally:
event.set()
future1.result() # wait for job to finish
def test_first_exception(self):
event1 = self.create_event()
event2 = self.create_event()
try:
future1 = self.executor.submit(mul, 2, 21)
future2 = self.executor.submit(wait_and_raise, event1)
future3 = self.executor.submit(event2.wait)
# Ensure that future1 is completed before future2 finishes
def wait_for_future1():
future1.result()
event1.set()
t = threading.Thread(target=wait_for_future1)
t.start()
finished, pending = futures.wait(
[future1, future2, future3],
return_when=futures.FIRST_EXCEPTION)
self.assertEqual(set([future1, future2]), finished)
self.assertEqual(set([future3]), pending)
threading_helper.join_thread(t)
finally:
event1.set()
event2.set()
future3.result() # wait for job to finish
def test_first_exception_some_already_complete(self):
event = self.create_event()
future1 = self.executor.submit(divmod, 21, 0)
future2 = self.executor.submit(event.wait)
try:
finished, pending = futures.wait(
[SUCCESSFUL_FUTURE,
CANCELLED_FUTURE,
CANCELLED_AND_NOTIFIED_FUTURE,
future1, future2],
return_when=futures.FIRST_EXCEPTION)
self.assertEqual(set([SUCCESSFUL_FUTURE,
CANCELLED_AND_NOTIFIED_FUTURE,
future1]), finished)
self.assertEqual(set([CANCELLED_FUTURE, future2]), pending)
finally:
event.set()
future2.result() # wait for job to finish
def test_first_exception_one_already_failed(self):
event = self.create_event()
future1 = self.executor.submit(event.wait)
try:
finished, pending = futures.wait(
[EXCEPTION_FUTURE, future1],
return_when=futures.FIRST_EXCEPTION)
self.assertEqual(set([EXCEPTION_FUTURE]), finished)
self.assertEqual(set([future1]), pending)
finally:
event.set()
future1.result() # wait for job to finish
def test_all_completed(self):
future1 = self.executor.submit(divmod, 2, 0)
future2 = self.executor.submit(mul, 2, 21)
finished, pending = futures.wait(
[SUCCESSFUL_FUTURE,
CANCELLED_AND_NOTIFIED_FUTURE,
EXCEPTION_FUTURE,
future1,
future2],
return_when=futures.ALL_COMPLETED)
self.assertEqual(set([SUCCESSFUL_FUTURE,
CANCELLED_AND_NOTIFIED_FUTURE,
EXCEPTION_FUTURE,
future1,
future2]), finished)
self.assertEqual(set(), pending)
def test_timeout(self):
short_timeout = 0.050
event = self.create_event()
future = self.executor.submit(event.wait)
try:
finished, pending = futures.wait(
[CANCELLED_AND_NOTIFIED_FUTURE,
EXCEPTION_FUTURE,
SUCCESSFUL_FUTURE,
future],
timeout=short_timeout,
return_when=futures.ALL_COMPLETED)
self.assertEqual(set([CANCELLED_AND_NOTIFIED_FUTURE,
EXCEPTION_FUTURE,
SUCCESSFUL_FUTURE]),
finished)
self.assertEqual(set([future]), pending)
finally:
event.set()
future.result() # wait for job to finish
class ThreadPoolWaitTests(ThreadPoolMixin, WaitTests, BaseTestCase):
def test_pending_calls_race(self):
# Issue #14406: multi-threaded race condition when waiting on all
# futures.
event = threading.Event()
def future_func():
event.wait()
oldswitchinterval = sys.getswitchinterval()
support.setswitchinterval(1e-6)
try:
fs = {self.executor.submit(future_func) for i in range(100)}
event.set()
futures.wait(fs, return_when=futures.ALL_COMPLETED)
finally:
sys.setswitchinterval(oldswitchinterval)
create_executor_tests(globals(), WaitTests,
executor_mixins=(ProcessPoolForkMixin,
ProcessPoolForkserverMixin,
ProcessPoolSpawnMixin))
def setUpModule():
setup_module()
if __name__ == "__main__":
unittest.main()
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