*
     * @param <E> the element type of {@link Stack}
     * @return a new instance of {@link Stack}
     * @see Stack#Stack()
     */
    public static <E> Stack<E> newStack() {
        return new Stack<>();
    }

    /**
     * Creates and returns a new instance of {@link SynchronousQueue}.
     *
     * @param <E> the element type of {@link SynchronousQueue}

        }
      }

      // Don't delegate to schedule() because that enforces shutdown rules.
      val newTask = AwaitIdleTask()
      if (scheduleAndDecide(newTask, 0L, recurrence = false)) {
        taskRunner.kickCoordinator(this)
      }
      return newTask.latch
    }
  }

  private class AwaitIdleTask : Task("$okHttpName awaitIdle", cancelable = false) {
    val latch = CountDownLatch(1)