selectors.py 文件源码

def _wrap_poll(self, timeout=None):
            """ Wrapper function for select.poll.poll() so that
            _syscall_wrapper can work with only seconds. """
            if timeout is not None:
                if timeout <= 0:
                    timeout = 0
                else:
                    # select.poll.poll() has a resolution of 1 millisecond,
                    # round away from zero to wait *at least* timeout seconds.
                    timeout = math.ceil(timeout * 1e3)

            result = self._poll.poll(timeout)
            return result