谁来调度操作系统中的调度程序——这不是先有鸡还是先有蛋的情况吗？
谁来安排调度程序？
创建的第一个任务是什么？第一个任务是如何创建的？它不需要任何资源或内存吗？这不是像先有鸡还是先有蛋的情况吗？
调度程序不是一个任务吗？它是否在每个时间片结束时获取CPU来检查哪个任务需要给CPU？
有没有什么好的链接可以让人深入思考和理解所有这些概念，而不是说出一些需要牢记的理论？
Who schedules the scheduler?
Which is the first task created and how is this first task created? Isn't any resource or memory required for it? isn't like a chicken and egg scenario?
Isn't scheduler a task? Does it get the CPU at the end of each time slice to check which task needs to be given CPU?
Are there any good links which makes a person think and understand deeply all these concepts rather than spilling out some theory which needs to be byhearted?
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调度程序由
简而言之，它由任何可能需要运行任务集的事件触发/或要重新评估这些任务的优先级。调度程序决定接下来运行哪些任务，并将控制权传递给下一个任务。
通常，调度器的这种“调度”是由与硬件中断相关联的代码或与系统调用相关联的代码引起的。
虽然您可以将调度程序视为真正的线程，但实际上它不需要以这种方式实现......因为它的执行优先级高于任何其他任务。事实上，复杂的操作系统可能会预留一个特殊的线程作为调度程序，并在调度程序获得控制权时将其标记为忙碌。这使得它很漂亮，但是伪造的线程不是由调度程序调度的
一个可以有多个调度程序：最高优先级的调度程序（例如我们刚刚描述的那个），以及其他真正是线程的调度程序，并且像其他用户一样运行任务。这种较低优先级的调度程序往往用于管理间隔时间较长的操作，例如后台作业。
The scheduler is scheduled by
In short, it is triggered by any event that might require that the set of tasks to be run and/or the priorities of those tasks to be reevaluated. The scheduler decides which task(s) run next, and passes control to the next task.
Typically, this "scheduling" of the scheduler is caused by the code associated with a hardware interrupt, or code associated with a system call.
While you can think of the scheduler as being a real thread, in practice it doesn't need to be implemented that way... because it is executed with higher priority than any other task. Sophisticated OSes may in fact set aside a special thread that is the scheduler, and mark it busy when the scheduler gets control. That makes it pretty, but the bogus thread isn't scheduled by the scheduler
One can have multiple schedulers: the highest priority one (e.g., the one we just described), and other schedulers which really are threads, and are run like other user tasks. Such lower priority schedulers tend to be used to manage actions which occur at much longer intervals, such as background jobs.
它通常由定时 CPU 中断定期调用
it is usually invoked periodically by a timed CPU interrupt