@staticmethod
    def clear_instance():
        if hasattr(IOLoop, "_instance"):
            del IOLoop._instance
launch the XMLRPC service.  if daemonize=True, detach & exit.
dataset/ETHPy150Open RobotWebTools/rosbridge_suite/rosbridge_server/src/tornado/ioloop.py/IOLoop.clear_instance--crossover with--dataset/ETHPy150Open cjlee112/pygr/pygr/coordinator.py/XMLRPCServerBase.serve_forever