'Sends a signal if the `IOLoop` is blocked for more than
``s`` seconds.
Pass ``seconds=None`` to disable.  Requires Python 2.6 on a unixy
platform.
The action parameter is a Python signal handler.  Read the
documentation for the `signal` module for more information.
If ``action`` is None, the process will be killed if it is
blocked for too long.'

def set_blocking_signal_threshold(self, seconds, action):

    raise NotImplementedError()
