asyncio: Optimize asyncio.sleep(0)
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@ -488,6 +488,10 @@ def as_completed(fs, *, loop=None, timeout=None):
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@coroutine
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def sleep(delay, result=None, *, loop=None):
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"""Coroutine that completes after a given time (in seconds)."""
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if delay == 0:
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yield
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return result
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future = futures.Future(loop=loop)
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h = future._loop.call_later(delay,
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future._set_result_unless_cancelled, result)
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@ -2188,5 +2188,29 @@ class RunCoroutineThreadsafeTests(test_utils.TestCase):
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self.assertEqual(context['exception'], exc_context.exception)
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class SleepTests(test_utils.TestCase):
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def setUp(self):
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self.loop = asyncio.new_event_loop()
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asyncio.set_event_loop(None)
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def test_sleep_zero(self):
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result = 0
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def inc_result(num):
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nonlocal result
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result += num
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@asyncio.coroutine
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def coro():
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self.loop.call_soon(inc_result, 1)
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self.assertEqual(result, 0)
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num = yield from asyncio.sleep(0, loop=self.loop, result=10)
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self.assertEqual(result, 1) # inc'ed by call_soon
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inc_result(num) # num should be 11
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self.loop.run_until_complete(coro())
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self.assertEqual(result, 11)
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if __name__ == '__main__':
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unittest.main()
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