Each task belongs to a scheduling class, which determines how a task will be scheduled.

每个任务都属于一个调度类，这决定了任务将如何调度。

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set_curr_task: This function is called when a task changes its scheduling class or changes its task group.

set_curr_task：当任务修改其调度类或修改其任务组时，将调用这个函数。

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A scheduling class defines a common set of functions (via sched_class) that define the behavior of the scheduler.

调度类定义一个通用函数集(通过sched_class)，函数集定义调度器的行为。

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