Certain critical sections of the kernel code are locked against preemption.

可以锁定内核代码的关键部分，不允许抢占。

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Code areas with synchronized access are sometimes called critical sections.

能够进行同步访问的代码块有时称为关键部分。

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Therefore, it is important for a thread programmer to minimize critical sections.

因此，对程序员而言减小临界域是很重要的。

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