code: def get_a_manager(threadPool_settings=None):
      
      global __singleton_manager
      if __singleton_manager is None:
          def _thread_entry():
              if prctl:
                  prctl.set_name('mirte manager')
              m.run()
              l.info('manager.run() returned')
          l = logging.getLogger('mirte.get_a_manager')
          l.info("Creating new instance")
          m = Manager(logging.getLogger('mirte'))
          if threadPool_settings:
              m.update_instance('threadPool', threadPool_settings)
          threading.Thread(target=_thread_entry).start()
          m.running_event.wait()
          __singleton_manager = m
      return __singleton_manager
docs: On first call, creates and returns a @mirte.core.Manager.  On
          subsequent calls, returns the previously created instance.
  
          If it is the first call, it will initialize the threadPool
          with @threadPool_settings.