* until one is ready. If there are no ready queues, or if other threads have everything under
   * control this will return null. If there is more than a single task ready to execute immediately
   * this will start another thread to handle that work.
   */
  fun awaitTaskToRun(): Task? {
    lock.assertHeld()

    while (true) {
      if (readyQueues.isEmpty()) {

  /** The task that's currently executing. Guarded by [TaskRunner.lock]. */
  private var currentTask: SerialTask = TestThreadSerialTask

  /** The coordinator task if it's waiting, and how it will resume. Guarded by [TaskRunner.lock]. */
  private var waitingCoordinatorTask: SerialTask? = null
  private var waitingCoordinatorInterrupted = false
  private var waitingCoordinatorNotified = false

    routePlanner.defaultConnectionIdleAtNanos = expireLater
    setPolicy(pool, address, ConnectionPool.AddressPolicy(1))
    assertThat(pool.connectionCount()).isEqualTo(1)

    // All other connections created will expire sooner
    routePlanner.defaultConnectionIdleAtNanos = expireSooner

    // Turn it into an http/2 connection that supports 5 concurrent streams
    // which can satisfy a larger policy