*
 * <p>Provides some fixtures for testing:</p>
 *
 * <ul>
 * <li>An action starts another action asynchronously without waiting for the result.</li>
 * <li>An action starts another action asynchronously and waits for the result.</li>
 * </ul>
 */
class ConcurrentTestUtil extends ExternalResource {
    private static final Logger LOG = LoggerFactory.getLogger(ConcurrentTestUtil.class)

    private Lock lock = new ReentrantLock()

// defined in package runtime

// Semacquire waits until *s > 0 and then atomically decrements it.
// It is intended as a simple sleep primitive for use by the synchronization
// library and should not be used directly.
func runtime_Semacquire(s *uint32)

// Semacquire(RW)Mutex(R) is like Semacquire, but for profiling contended
// Mutexes and RWMutexes.
// If lifo is true, queue waiter at the head of wait queue.

	return nil
}

// waitForTLSBootstrappedClient waits for the /etc/kubernetes/kubelet.conf file to be available
func waitForTLSBootstrappedClient(timeout time.Duration) error {
	fmt.Println("[kubelet-start] Waiting for the kubelet to perform the TLS Bootstrap")

	// Loop on every falsy return. Return with an error if raised. Exit successfully if true is returned.
	return wait.PollUntilContextTimeout(context.Background(),

// when f will run, in which case Reset returns true, or schedules f
// to run again, in which case it returns false.
// When Reset returns false, Reset neither waits for the prior f to
// complete before returning nor does it guarantee that the subsequent
// goroutine running f does not run concurrently with the prior
// one. If the caller needs to know whether the prior execution of

				}
			}
		}

		// Incorporate updates from sender into local copy.
		for i := range sig.mask {
			sig.recv[i] = atomic.Xchg(&sig.mask[i], 0)
		}
	}
}

// signalWaitUntilIdle waits until the signal delivery mechanism is idle.
// This is used to ensure that we do not drop a signal notification due
// to a race between disabling a signal and receiving a signal.

		r.writeCond.Broadcast()
	}

	// Unlock the mutex so readers/writers can finish.
	r.mu.Unlock()
	r.wg.Wait()
	r.mu.Lock()
	r.r = 0
	r.w = 0
	r.err = nil
	r.isFull = false
}

// WriteCloser returns a WriteCloser that writes to the ring buffer.
// When the returned WriteCloser is closed, it will wait for all data to be read before returning.
func (r *RingBuffer) WriteCloser() io.WriteCloser {

// Depending upon object type, waits afterward until the object is synced
// by the policy source
func (p *PolicyTestContext[P, B, E]) update(wait bool, objects ...runtime.Object) error {
	for _, object := range objects {
		if err := p.updateOne(object); err != nil {
			return err
		}
	}

	if wait {
		timeoutCtx, timeoutCancel := context.WithTimeout(p, 3*time.Second)

type exitStatus struct {
	err error
}

// Run starts the envoy and waits until it terminates.
// There are a few exit paths:
//  1. Envoy exits. In this case, we simply log and exit.
//  2. /quitquitquit (on agent, not Envoy) is called. We will set skipDrain and cancel the context, which triggers us to exit immediately.

		// shutting down, so give it some time.
		time.Sleep(1 * time.Millisecond)
	}
	t.Errorf("Test appears to have leaked %s:\n%s", bad, stacks)
}

// waitCondition waits for fn to return true,
// checking immediately and then at exponentially increasing intervals.
func waitCondition(t testing.TB, delay time.Duration, fn func(time.Duration) bool) {
	t.Helper()
	start := time.Now()

	}()

	// wait for all in-flight non-long running requests to finish
	nonLongRunningRequestDrainedCh := make(chan struct{})
	go func() {
		defer close(nonLongRunningRequestDrainedCh)
		defer klog.V(1).Info("[graceful-termination] in-flight non long-running request(s) have drained")

		// wait for the delayed stopCh before closing the handler chain (it rejects everything after Wait has been called).