SCHED_FIFO不为线程分时间片。
任务分时间片执行，在使用它们分配到的时间片时，这些任务被从活动的runqueue移至过期的runqueue。
Tasks are given time slices for execution, and when they use their allocation of time slice, they're moved from the active runqueue to the expired runqueue.
窗外是一片树林和很多的猴子，大部分时间继续独处，发明了一个游戏。
Outside the window is a great expanse of trees with quite some monkeys playing around.
窗外是一片树林和很多的猴子，大部分时间继续独处，发明了一个游戏。
Outside the window is a great expanse of trees with quite some monkeys playing around.
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