code: func (c *Controller) processNextWorkItem() bool {
  	pvKey, quit := c.queue.Get()
  	if quit {
  		return false
  	}
  	defer c.queue.Done(pvKey)
  
  	pvName := pvKey.(string)
  
  	err := c.processPV(pvName)
  	if err == nil {
  		c.queue.Forget(pvKey)
  		return true
  	}
  
  	utilruntime.HandleError(fmt.Errorf("PV %v failed with : %v", pvKey, err))
  	c.queue.AddRateLimited(pvKey)
  
  	return true
  }
docs: // processNextWorkItem deals with one pvcKey off the queue.  It returns false when it's time to quit.