test_retry_eintr.py 文件源码

def alarm(self, t=None):
        """start a timer to fire only once

        like signal.alarm, but with better resolution than integer seconds.
        """
        if t is None:
            t = self.signal_delay
        self.timer_fired = False
        self.orig_handler = signal.signal(signal.SIGALRM, self.stop_timer)
        # signal_period ignored, since only one timer event is allowed to fire
        signal.setitimer(signal.ITIMER_REAL, t, 1000)