ioloop.py 文件源码

def poll(self,
                 timeout,
                 _len=len,
                 _READ=select.KQ_FILTER_READ,
                 _WRITE=select.KQ_FILTER_WRITE,
                 _EOF=select.KQ_EV_EOF,
                 _ERROR=select.KQ_EV_ERROR):
            try:
                kevents = self._kqueue.control(None, _len(self.socket_map),
                                               timeout)
            except OSError as err:
                if err.errno == errno.EINTR:
                    return
                raise
            for kevent in kevents:
                inst = self.socket_map.get(kevent.ident)
                if inst is None:
                    continue
                if kevent.filter == _READ:
                    if inst.readable():
                        _read(inst)
                if kevent.filter == _WRITE:
                    if kevent.flags & _EOF:
                        # If an asynchronous connection is refused,
                        # kqueue returns a write event with the EOF
                        # flag set.
                        # Note that for read events, EOF may be returned
                        # before all data has been consumed from the
                        # socket buffer, so we only check for EOF on
                        # write events.
                        inst.handle_close()
                    else:
                        if inst.writable():
                            _write(inst)
                if kevent.flags & _ERROR:
                    inst.handle_close()


# ===================================================================
# --- choose the better poller for this platform
# ===================================================================