要用线程安全地编写程序是很难的；需要操纵线程的程序很容易引起不一致的数据、死锁、不可伸缩的锁定以及倒置的优先级等问题。

It's hard to program safely; programs that manipulate threads are prone to inconsistent data, deadlocks, unscalable locking, and inverted priorities.

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这个问题称为优先级倒置(priority inversion)(更多信息见参考资料中的链接)。

This problem is known as priority inversion (see Resources for links to more information).

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