_test_multiprocessing.py 文件源码

def test_waitfor(self):
        # based on test in test/lock_tests.py
        cond = self.Condition()
        state = self.Value('i', -1)

        p = self.Process(target=self._test_waitfor_f, args=(cond, state))
        p.daemon = True
        p.start()

        with cond:
            result = cond.wait_for(lambda : state.value==0)
            self.assertTrue(result)
            self.assertEqual(state.value, 0)

        for i in range(4):
            time.sleep(0.01)
            with cond:
                state.value += 1
                cond.notify()

        p.join(5)
        self.assertFalse(p.is_alive())
        self.assertEqual(p.exitcode, 0)