STINNER Victor added the comment:
It's related to bpo-30807, "setitimer() can disable timer by mistake".
Test code:
def test_setitimer_tiny(self):
# bpo-30807: C setitimer() takes a microsecond-resolution interval.
# Check that float -> timeval conversion doesn't round
# the interval down to zero, which would disable the timer.
self.itimer = signal.ITIMER_REAL
signal.setitimer(self.itimer, 1e-6)
time.sleep(1)
self.assertEqual(self.hndl_called, True)
----------
nosy: +pitrou
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<http://bugs.python.org/issue31246>
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