这两个方法演示了一个场景：将五个消息输入到消息队列，然后取出并处理具有最高优先级的消息。
The two methods demonstrate a scenario in which five messages are input to a message queue and the one with the highest priority is taken out of the queue and processed.
在每个迭代过程中，我们处理那些仍旧需要实现的最高优先级需求，有效地减少需求堆栈。
During each iteration we work on the highest priority requirements which are still left to be implemented, effectively working our way down the requirements stack.
如果控制器向设备发送了suspend信号，那么这个事件以最高优先级得到处理。
If the controller has sent a suspend signal to the device, this event gets processed with the highest priority.
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