When using polling, the processor examines its input queue at fixed intervals. 当使用轮转的时候,处理器定周期检测输入队列。
When the system is in either of these journaling modes, applications must take turns reading input from the input queue. 当系统处于这些模式中的任意一个时,应用程序必须轮流从输入队列读入输入。