ioloop.py 文件源码

def _control(self, fd, events, flags):
            kevents = []
            if events & self.WRITE:
                kevents.append(select.kevent(
                    fd, filter=select.KQ_FILTER_WRITE, flags=flags))
            if events & self.READ or not kevents:
                # always read when there is not a write
                kevents.append(select.kevent(
                    fd, filter=select.KQ_FILTER_READ, flags=flags))
            # even though control() takes a list, it seems to return
            # EINVAL on Mac OS X (10.6) when there is more than one
            # event in the list
            for kevent in kevents:
                self._kqueue.control([kevent], 0)

        # localize variable access to minimize overhead