func (db *DB) Stats() DBStats {
	wait := db.waitDuration.Load()

	db.mu.Lock()
	defer db.mu.Unlock()

	stats := DBStats{
		MaxOpenConnections: db.maxOpen,

		Idle:            len(db.freeConn),
		OpenConnections: db.numOpen,
		InUse:           db.numOpen - len(db.freeConn),

		WaitCount:         db.waitCount,
		WaitDuration:      time.Duration(wait),
		MaxIdleClosed:     db.maxIdleClosed,

* Cherrypick [#34851](https://github.com/kubernetes/kubernetes/pull/34851) "Only wait for cache syncs once in NodeController" ([#34861](https://github.com/kubernetes/kubernetes/pull/34861), [@jessfraz](https://github.com/jessfraz))
* NodeController waits for informer sync before doing anything ([#34809](https://github.com/kubernetes/kubernetes/pull/34809), [@gmarek](https://github.com/gmarek))

    }
  }

  /** A reference to a value. */
  interface ValueReference<K, V> {
    /** Returns the value. Does not block or throw exceptions. */
    @CheckForNull
    V get();

    /**
     * Waits for a value that may still be loading. Unlike get(), this method can block (in the case
     * of FutureValueReference).
     *
     * @throws ExecutionException if the loading thread throws an exception

* Only wait for cache syncs once in NodeController ([#34851](https://github.com/kubernetes/kubernetes/pull/34851), [@ncdc](https://github.com/ncdc))
* NodeController waits for informer sync before doing anything ([#34809](https://github.com/kubernetes/kubernetes/pull/34809), [@gmarek](https://github.com/gmarek))

    }
  }

  /** A reference to a value. */
  interface ValueReference<K, V> {
    /** Returns the value. Does not block or throw exceptions. */
    @CheckForNull
    V get();

    /**
     * Waits for a value that may still be loading. Unlike get(), this method can block (in the case
     * of FutureValueReference).
     *
     * @throws ExecutionException if the loading thread throws an exception

        def cleaningBarrier = blockingHttpServer.expectAndBlock("cleaning")
        def cleaningBuild = executer.withTasks("waitForCleaningBarrier").withArgument("--no-daemon").start()

        then: 'cleaning build starts and waits on its barrier'
        cleaningBarrier.waitForAllPendingCalls()

        when: 'transforming build is started'
        def transformBarrier = blockingHttpServer.expectAndBlock("transform")

// [ListenAndServeTLS] immediately return [ErrServerClosed]. Make sure the
// program doesn't exit and waits instead for Shutdown to return.
//
// Shutdown does not attempt to close nor wait for hijacked
// connections such as WebSockets. The caller of Shutdown should
// separately notify such long-lived connections of shutdown and wait
// for them to close, if desired. See [Server.RegisterOnShutdown] for a way to

	}

	return nil
}

func retryWithExponentialBackOff(initialDuration time.Duration, fn wait.ConditionFunc) error {
	backoff := wait.Backoff{
		Duration: initialDuration,
		Factor:   3,
		Jitter:   0,
		Steps:    6,
	}
	return wait.ExponentialBackoff(backoff, fn)
}

func simulateVolumeInUseUpdate(
	volumeName v1.UniqueVolumeName,
	stopCh <-chan struct{},

	if err := cmd.Start(); err != nil {
		b.Fatalf("subprocess failed to start: %v", err)
	}

	done := make(chan error, 1)
	go func() {
		done <- cmd.Wait()
		close(done)
	}()
	defer func() {
		cancel()
		<-done
	}()

	// Wait for the server in the child process to respond and tell us
	// its listening address, once it's started listening:
	bs := bufio.NewScanner(stdout)
	if !bs.Scan() {

	opening.Add(tryOpen)

	setHookOpenErr(func() error {
		// Wait for all connections to enqueue.
		opening.Wait()
		return errOffline
	})

	for i := 0; i < tryOpen; i++ {
		go func() {
			opening.Done() // signal one connection is in flight
			_, err := db.Exec("will never run")
			errs <- err
		}()
	}

	opening.Wait() // wait for all workers to begin running