return nil
	}
	if err != nil {
		return err
	}

	err = dc.trySync(ctx, pdb)
	// If the reason for failure was a conflict, then allow this PDB update to be
	// requeued without triggering the failSafe logic.
	if errors.IsConflict(err) {
		return err
	}
	if err != nil {
		logger.Error(err, "Failed to sync PDB", "podDisruptionBudget", klog.KRef(namespace, name))

   * Queue#isEmpty} and {@link Queue#remove()}, since {@link Queue}'s iteration order is undefined.
   * Calling {@link Iterator#hasNext()} on a generated iterator from the returned iterable may cause
   * an item to be immediately dequeued for return on a subsequent call to {@link Iterator#next()}.
   *
   * <p>Whether the input {@code iterable} is a {@link Queue} or not, the returned {@code Iterable}
   * is not thread-safe.
   *

	ec.queue.AddRateLimited(key)

	return true
}

// syncHandler is invoked for each work item which might need to be processed.
// If an error is returned from this function, the item will be requeued.
func (ec *Controller) syncHandler(ctx context.Context, key string) error {
	sep := strings.Index(key, ":")
	if sep < 0 {
		return fmt.Errorf("unexpected key: %s", key)
	}

    if (IsMerge(node)) {
      for (const Edge* e : node->in_edges()) {
        if (IsNextIteration(e->src())) {
          ++num_ready_inputs[node->id()];
        }
      }
    }
  }

  // dequeue is used to ensure that the nodes are first-in-first-out.  This
  // order guarantees that the exits in the ready queue are visited before
  // nodes that will become ready in the future.
  std::deque<Node*> ready;

		// When Extenders reject some Nodes and the pod ends up being unschedulable,
		// we put framework.ExtenderName to pInfo.UnschedulablePlugins.
		// This Pod will be requeued from unschedulable pod pool to activeQ/backoffQ
		// by any kind of cluster events.
		// https://github.com/kubernetes/kubernetes/issues/122019
		if diagnosis.UnschedulablePlugins == nil {

func blockTimerChan(c *hchan) {
	t := c.timer
	t.lock()
	t.trace("blockTimerChan")
	if !t.isChan {
		badTimer()
	}

	t.blocked++

	// If this is the first enqueue after a recent dequeue,
	// the timer may still be in the heap but marked as a zombie.
	// Unmark it in this case, if the timer is still pending.
	if t.state&timerHeaped != 0 && t.state&timerZombie != 0 && t.when > 0 {
		t.state &^= timerZombie

		if _, updateErr = dsClient.UpdateStatus(ctx, toUpdate, metav1.UpdateOptions{}); updateErr == nil {
			return nil
		}

		// Stop retrying if we exceed statusUpdateRetries - the DaemonSet will be requeued with a rate limit.
		if i >= StatusUpdateRetries {
			break
		}
		// Update the set with the latest resource version for the next poll

    @Synchronized
    override fun dispatch(request: RecordedRequest): MockResponse {
      // This guarantees a deterministic sequence when handling the canceled request:
      // 1. Server reads request and dequeues first response
      // 2. Client cancels request
      // 3. Server tries to send response on the canceled stream
      // Otherwise, there is no guarantee for the sequence. For example, the server may use the

		watcher.stopLocked()
	}
	c.watchersToStop = c.watchersToStop[:0]

	for _, watcher := range c.expiredBookmarkWatchers {
		if watcher.stopped {
			continue
		}
		// requeue the watcher for the next bookmark if needed.
		c.bookmarkWatchers.addWatcherThreadUnsafe(watcher)
	}
	c.expiredBookmarkWatchers = c.expiredBookmarkWatchers[:0]
}

func (c *Cacher) terminateAllWatchers() {

	if err != nil {
		utilruntime.HandleError(fmt.Errorf("couldn't get key for object %+v: %v", obj, err))
		return
	}
	jm.orphanQueue.Add(key)
}

// worker runs a worker thread that just dequeues items, processes them, and marks them done.
// It enforces that the syncHandler is never invoked concurrently with the same key.
func (jm *Controller) worker(ctx context.Context) {
	for jm.processNextWorkItem(ctx) {
	}