This class provides better control of nested wait loops in the active scheduler.
在活动调度器中，这个类能更好地控制嵌套的等待循环。
The scheduler USES two priority arrays, namely active and expired arrays, that are accessed through Pointers.
调度器使用了两个优先级数组，即活动数组和过期数组，可以通过指针来访问它们。
Before the 2.6 kernel, the scheduler had a significant limitation when many tasks were active.
在2.6版本的内核之前，当很多任务都处于活动状态时，调度器有很明显的限制。
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