该调度算法适合于有优先级控制的广播链路。
This scheduling algorithms can also be applied to broadcast links with priority requirement.
当发送广播的时候设置了这个标志，会允许接收者以前台的优先级运行，有更短的时间间隔。
If set, when sending a broadcast the recipient is allowed to run at foreground priority, with a shorter timeout interval.
正常广播的接受者是后台优先级，不会被自动提升。
During normal broadcasts the receivers are not automatically hoisted out of the background priority class.
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