class_docstr: A kqueue-based event loop for BSD/Mac systems.
code: def unregister(self, fd):
      events = self._active.pop(fd)
      self._control(fd, events, select.KQ_EV_DELETE)
  
file_path: catboost/contrib/python/tornado/tornado-4/tornado/platform/kqueue.py
imports: from __future__ import absolute_import, division, print_function
  import select
  from tornado.ioloop import IOLoop, PollIOLoop
label_desc: Use image node_id 6 for calling the _KQueue obj's underlying member method code with example usage: obj.unregister(fd) without return types