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bpo-29255: Wait in KqueueSelector.select when no fds are registered (GH-19508)

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Also partially fixes bpo-25680 (there's still a discrepancy in behavior
on Windows that needs to be fixed).
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Russell Davis 2020-04-15 11:57:06 -07:00 • committed by GitHub
parent 4b4e90a518
commit ba1bcffe5c
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3 changed files with 18 additions and 1 deletions
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13
Lib/test/test_selectors.py
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@ -543,6 +543,19 @@ class KqueueSelectorTestCase(BaseSelectorTestCase, ScalableSelectorMixIn):
with self.assertRaises(KeyError):
s.get_key(bad_f)
def test_empty_select_timeout(self):
# Issues #23009, #29255: Make sure timeout is applied when no fds
# are registered.
s = self.SELECTOR()
self.addCleanup(s.close)
t0 = time()
self.assertEqual(s.select(1), [])
t1 = time()
dt = t1 - t0
# Tolerate 2.0 seconds for very slow buildbots
self.assertTrue(0.8 <= dt <= 2.0, dt)
@unittest.skipUnless(hasattr(selectors, 'DevpollSelector'),
"Test needs selectors.DevpollSelector")