code: func (r *Runner) Stop() {
  	r.stopLock.Lock()
  	defer r.stopLock.Unlock()
  
  	if r.stopped {
  		return
  	}
  
  	log.Printf("[INFO] (runner) stopping")
  	r.stopDedup()
  	r.stopWatcher()
  	r.stopChild()
  
  	if err := r.deletePid(); err != nil {
  		log.Printf("[WARN] (runner) could not remove pid at %v: %s",
  			r.config.PidFile, err)
  	}
  
  	r.stopped = true
  
  	close(r.DoneCh)
  }
docs: // Stop halts the execution of this runner and its subprocesses.