Method test_timerfd_TFD_TIMER_ABSTIME

Lib/test/test_os.py:4408–4432

(self)

        self.assertEqual(self.read_count_signaled(fd), count)

    def test_timerfd_TFD_TIMER_ABSTIME(self):
        fd = self.timerfd_create(time.CLOCK_REALTIME)

        now = time.clock_gettime(time.CLOCK_REALTIME)

        # 1 second later from now.
        offset = 1
        initial_expiration = now + offset
        # not interval timer
        interval = 0

        os.timerfd_settime(fd, flags=os.TFD_TIMER_ABSTIME, initial=initial_expiration, interval=interval)

        # timerfd_gettime
        # Note: timerfd_gettime returns relative values even if TFD_TIMER_ABSTIME is specified.
        next_expiration, interval2 = os.timerfd_gettime(fd)
        self.assertAlmostEqual(interval2, interval, places=self.CLOCK_RES_PLACES)
        self.assertAlmostEqual(next_expiration, offset, places=self.CLOCK_RES_PLACES)

        t = time.perf_counter()
        count_signaled = self.read_count_signaled(fd)
        t = time.perf_counter() - t
        self.assertEqual(count_signaled, 1)

        self.assertGreater(t, offset - self.CLOCK_RES)

    def test_timerfd_select(self):
        fd = self.timerfd_create(time.CLOCK_REALTIME, flags=os.TFD_NONBLOCK)