delayNanos: Long,
  ) {
    lock.assertHeld()

    val queue = task.queue!!
    check(queue.activeTask === task)

    val cancelActiveTask = queue.cancelActiveTask
    queue.cancelActiveTask = false
    queue.activeTask = null
    busyQueues.remove(queue)

    if (delayNanos != -1L && !cancelActiveTask && !queue.shutdown) {
      queue.scheduleAndDecide(task, delayNanos, recurrence = true)
    }

	// qsCompleter holds the QueueSetCompleter derived from `config`
	// and `queues`.
	qsCompleter fq.QueueSetCompleter

	// The QueueSet for this priority level.
	// Never nil.
	queues fq.QueueSet

	// quiescing==true indicates that this priority level should be
	// removed when its queues have all drained.
	quiescing bool

	// number of goroutines between Controller::Match and calling the

	cKey, quit := c.queue.Get()
	if quit {
		return false
	}
	defer c.queue.Done(cKey)

	err := c.syncEndpoints(logger, cKey)
	c.handleErr(logger, err, cKey)

	return true
}

func (c *Controller) handleErr(logger klog.Logger, err error, key string) {
	if err == nil {
		c.queue.Forget(key)
		return
	}

	if c.queue.NumRequeues(key) < maxRetries {

type QueuingConfiguration struct {
	// `queues` is the number of queues for this priority level. The
	// queues exist independently at each apiserver. The value must be
	// positive.  Setting it to 1 effectively precludes
	// shufflesharding and thus makes the distinguisher method of
	// associated flow schemas irrelevant.  This field has a default
	// value of 64.
	// +optional
	Queues int32 `json:"queues" protobuf:"varint,1,opt,name=queues"`

			}
		case toSend = <-c.outQueue:
			if len(toSend) == 0 {
				continue
			}
		}
		if len(queue) < maxMergeMessages && queueSize+len(toSend) < writeBufferSize-1024 && len(c.outQueue) > 0 {
			queue = append(queue, toSend)
			queueSize += len(toSend)
			continue
		}
		c.outMessages.Add(int64(len(queue) + 1))
		if c.outgoingBytes != nil {
			c.outgoingBytes(int64(len(toSend) + queueSize))
		}

        // 3. Stop receiving incoming messages. Blocks until the receive thread has finished. This will notify the stdin and receive queues to signal end of input.
        // 4. Stop the receive queue, to unblock any threads blocked in receive().
        // 5. Stop handling stdin. Blocks until the handler has finished. Discards any queued input.
        CompositeStoppable.stoppable(disconnectQueue, connection, executor, receiveQueue, stdinQueue, cancelQueue).stop();

// onServiceDelete removes the Service Selector from the cache and queues the Service for processing.
func (c *Controller) onServiceDelete(obj interface{}) {
	key, err := controller.KeyFunc(obj)
	if err != nil {
		utilruntime.HandleError(fmt.Errorf("Couldn't get key for object %+v: %v", obj, err))
		return
	}

	c.serviceQueue.Add(key)
}

// onEndpointSliceAdd queues a sync for the relevant Service for a sync if the

     * the thread pool is full of work items that are waiting on other queued work items.  The queued work items cannot execute
     * because the thread pool is already full with their parent work items.  We use expand() to allow the thread pool to temporarily
     * expand when work items have to wait on other work.  The thread pool will shrink below max workers again once the queue is
     * drained.
     */
    private void expand(boolean force) {

	err := func(logger klog.Logger, obj interface{}) error {
		// We call Done here so the workNodeQueue knows we have finished
		// processing this item. We also must remember to call Forget if we
		// do not want this work item being re-queued. For example, we do
		// not call Forget if a transient error occurs, instead the item is
		// put back on the queue and attempted again after a back-off

	// A pod added with a deletion timestamp should decrement deletions, not creations.
	manager.addPod(logger, &pod)

	queueRS, _ := manager.queue.Get()
	if queueRS != rsKey {
		t.Fatalf("Expected to find key %v in queue, found %v", rsKey, queueRS)
	}
	manager.queue.Done(rsKey)

	podExp, exists, err := manager.expectations.GetExpectations(rsKey)
	if !exists || err != nil || !podExp.Fulfilled() {