gen_test.py 文件源码

def test_moment(self):
        calls = []

        @gen.coroutine
        def f(name, yieldable):
            for i in range(5):
                calls.append(name)
                yield yieldable
        # First, confirm the behavior without moment: each coroutine
        # monopolizes the event loop until it finishes.
        immediate = Future()
        immediate.set_result(None)
        yield [f('a', immediate), f('b', immediate)]
        self.assertEqual(''.join(calls), 'aaaaabbbbb')

        # With moment, they take turns.
        calls = []
        yield [f('a', gen.moment), f('b', gen.moment)]
        self.assertEqual(''.join(calls), 'ababababab')
        self.finished = True

        calls = []
        yield [f('a', gen.moment), f('b', immediate)]
        self.assertEqual(''.join(calls), 'abbbbbaaaa')