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bpo-22087: Fix Policy.get_event_loop() to detect fork #7208

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Merged
1st1 merged 2 commits into from
May 29, 2018
Merged

bpo-22087: Fix Policy.get_event_loop() to detect fork #7208

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bpo-22087: Fix Policy.get_event_loop() to detect fork and return a ne…
May 29, 2018
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May 29, 2018
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Yury Selivanov
Yury Selivanov committed May 29, 2018
commit 0bd8ecbd8cc3ab15b8a54af47c32fc9da7113b06
17 changes: 14 additions & 3 deletions Lib/test/test_asyncio/test_unix_events.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1811,18 +1811,29 @@ def setUp(self):
asyncio.set_event_loop(self.parent_loop)
self.ctx = multiprocessing.get_context("fork")

def tearDown(self):
self.parent_loop.close()

def _check_loops_not_equal(self, old_loop):
loop = asyncio.get_event_loop()
if loop is old_loop:
raise RuntimeError("Child process inherited parent's event loop")

try:
val = loop.run_until_complete(asyncio.sleep(0.05, result=42))
if val != 42:
raise RuntimeError("new event loop does not work")
finally:
loop.close()

sys.exit(loop is old_loop)

def test_new_loop_in_child(self):
p = self.ctx.Process(target=self._check_loops_not_equal,
args=(self.parent_loop,))
p.start()
p.join()
self.assertEqual(p.exitcode, 0,
"Child process inherited parent's event loop")
self.parent_loop.close()
self.assertEqual(p.exitcode, 0)


class PolicyTests(unittest.TestCase):
Expand Down