class_docstr: A KernelClient that provides thread-safe sockets with async callbacks on message replies.
      
code: def ioloop(self):
      return self.ioloop_thread.ioloop
  
imports: from __future__ import absolute_import
  import atexit
  import errno
  import sys
  from threading import Thread, Event
  import time
  from zmq import ZMQError
  from zmq.eventloop import ioloop, zmqstream
  from traitlets import Type, Instance
  from jupyter_client.channels import HBChannel
  from jupyter_client import KernelClient
label_desc: Use image node_id 1 for calling the ThreadedKernelClient obj's underlying member method code with example usage: obj.ioloop() and returns: self