Method start

python/python3/tornado/tcpserver.py:266–308

Starts this server in the `.IOLoop`. By default, we run the server in this process and do not fork any additional child process. If num_processes is ``None`` or <= 0, we detect the number of cores available on this machine and fork that number of child proce

(
        self, num_processes: Optional[int] = 1, max_restarts: Optional[int] = None
    )

            self._pending_sockets.extend(sockets)

    def start(
        self, num_processes: Optional[int] = 1, max_restarts: Optional[int] = None
    ) -> None:
        """Starts this server in the `.IOLoop`.

        By default, we run the server in this process and do not fork any
        additional child process.

        If num_processes is ``None`` or <= 0, we detect the number of cores
        available on this machine and fork that number of child
        processes. If num_processes is given and > 1, we fork that
        specific number of sub-processes.

        Since we use processes and not threads, there is no shared memory
        between any server code.

        Note that multiple processes are not compatible with the autoreload
        module (or the ``autoreload=True`` option to `tornado.web.Application`
        which defaults to True when ``debug=True``).
        When using multiple processes, no IOLoops can be created or
        referenced until after the call to ``TCPServer.start(n)``.

        Values of ``num_processes`` other than 1 are not supported on Windows.

        The ``max_restarts`` argument is passed to `.fork_processes`.

        .. versionchanged:: 6.0

           Added ``max_restarts`` argument.

        .. deprecated:: 6.2
           Use either ``listen()`` or ``add_sockets()`` instead of ``bind()``
           and ``start()``. The ``bind()/start()`` pattern depends on
           interfaces that have been deprecated in Python 3.10 and will be
           removed in future versions of Python.
        """
        assert not self._started
        self._started = True
        if num_processes != 1:
            process.fork_processes(num_processes, max_restarts)
        sockets = self._pending_sockets
        self._pending_sockets = []
        self.add_sockets(sockets)

    def stop(self) -> None:
        """Stops listening for new connections.