Method add_callback

tornado/ioloop.py:646–656

Calls the given callback on the next I/O loop iteration. It is safe to call this method from any thread at any time, except from a signal handler. Note that this is the **only** method in `IOLoop` that makes this thread-safety guarantee; all other interaction with t

(self, callback: Callable, *args: Any, **kwargs: Any)

        raise NotImplementedError()

    def add_callback(self, callback: Callable, *args: Any, **kwargs: Any) -> None:
        """Calls the given callback on the next I/O loop iteration.

        It is safe to call this method from any thread at any time,
        except from a signal handler.  Note that this is the **only**
        method in `IOLoop` that makes this thread-safety guarantee; all
        other interaction with the `IOLoop` must be done from that
        `IOLoop`'s thread.  `add_callback()` may be used to transfer
        control from other threads to the `IOLoop`'s thread.
        """
        raise NotImplementedError()

    def add_callback_from_signal(
        self, callback: Callable, *args: Any, **kwargs: Any