new_contents: __names__ = ['get_a_manager']
  
  import logging
  
  import threading
  
  from mirte.core import Manager
  
  __singleton_manager = None
  
  def get_a_manager():
          """ On first call, creates and returns a @mirte.core.Manager.  On
              subsequent calls, returns the previously created instance """
          global __singleton_manager
          if __singleton_manager is None:
                  def _thread_entry():
                          m.run()
                          l.info('manager.run() returned')
                  l = logging.getLogger('mirte.get_a_manager')
                  l.info("Creating new instance")
                  m = Manager(logging.getLogger('mirte'))
                  threading.Thread(target=_thread_entry).start()
                  m.running_event.wait()
                  __singleton_manager = m
          return __singleton_manager
  
subject: add get_a_manager()