<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def defer_callback(callback, *args, **kwargs):
 """Register `callback` to run in the server event loop thread."""

    start()
    global_server.ioloop.add_callback(lambda: callback(*args, **kwargs))