正确配置signal.setitimer()

Question

我很难弄清楚为什么程序无限期地暂停，即显示出类似无限循环的行为

def class foo():
    '''
    ...
    '''
    def __catcher(self, signum, _):
        print "TIME OUT EXCEEDED"
        # Reset timer
        signal.setitimer(signal.ITIMER_REAL, 0.0, _SENDERTMOUT_)
        # Do something 
        for i in range (self.base, self.next_seqno):
            '''
            ...
            '''
    def start(self):
        while something:
            '''
            Start doing some work
            '''
            if self.base == self.next_seqno:
                old_handler = signal.signal(signal.SIGALRM, self.__catcher) 
                signal.setitimer(signal.ITIMER_REAL, _SENDERTMOUT_)
            '''
            Do more work until timer goes off
            '''

也许我不知道执行的顺序，当定时器超时在start()中，程序跳转到__catcher()，对吗?然后计时器被重置，剩下的语句，然后程序在哪里恢复执行?

谢谢你的帮助!

Answer 1

我猜它会回到计时器中断的地方?