selector_events.py 文件源码

def _sendto_ready(self):
        while self._buffer:
            data, addr = self._buffer.popleft()
            try:
                if self._address:
                    self._sock.send(data)
                else:
                    self._sock.sendto(data, addr)
            except (BlockingIOError, InterruptedError):
                self._buffer.appendleft((data, addr))  # Try again later.
                break
            except OSError as exc:
                self._protocol.error_received(exc)
                return
            except Exception as exc:
                self._fatal_error(exc,
                                  'Fatal write error on datagram transport')
                return

        self._maybe_resume_protocol()  # May append to buffer.
        if not self._buffer:
            self._loop.remove_writer(self._sock_fd)
            if self._closing:
                self._call_connection_lost(None)