val task =
      object : Task("task") {
        val schedules = mutableListOf(50.µs)
        val delays = mutableListOf(200.µs, -1)

        override fun runOnce(): Long {
          log += "run@${taskFaker.nanoTime}"
          if (schedules.isNotEmpty()) {
            redQueue.schedule(this, schedules.removeAt(0))
          }
          return delays.removeAt(0)
        }
      }

      if (queue.futureTasks.isEmpty()) {
        readyQueues.removeAt(i)
      }
    }
  }

  interface Backend {
    fun nanoTime(): Long

    fun coordinatorNotify(taskRunner: TaskRunner)

    fun coordinatorWait(
      taskRunner: TaskRunner,
      nanos: Long,
    )

    fun <T> decorate(queue: BlockingQueue<T>): BlockingQueue<T>

    fun execute(
      taskRunner: TaskRunner,

                  startNextTask()
                }
              }
            }
        }

        override fun coordinatorWait(
          taskRunner: TaskRunner,
          nanos: Long,
        ) {
          taskRunner.assertThreadHoldsLock()
          check(waitingCoordinatorTask == null)
          if (nanos == 0L) return

          // Yield until notified, interrupted, or the duration elapses.