code: func (e *TokensController) Run(workers int, stopCh <-chan struct{}) {
  	// Shut down queues
  	defer utilruntime.HandleCrash()
  	defer e.syncServiceAccountQueue.ShutDown()
  	defer e.syncSecretQueue.ShutDown()
  
  	if !controller.WaitForCacheSync("tokens", stopCh, e.serviceAccountSynced, e.secretSynced) {
  		return
  	}
  
  	klog.V(5).Infof("Starting workers")
  	for i := 0; i < workers; i++ {
  		go wait.Until(e.syncServiceAccount, 0, stopCh)
  		go wait.Until(e.syncSecret, 0, stopCh)
  	}
  	<-stopCh
  	klog.V(1).Infof("Shutting down")
  }
docs: // Runs controller blocks until stopCh is closed