One of the simplest examples of priority inversion, illustrated in the top diagram in Figure 2, involves three threads: one high (h), one medium (m), and one low (l) priority thread.

图2最上面的图表解释了一个最简单的优先级反转示例，它涉及三个线程：一个高级(H)、一个中级(M)和一个低级(L)优先级线程。

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Elongate your spine as if a thread extending from the top of your crown was pulling your head, neck and back straight up towards the sky.

伸展你的脊柱，好像有一根线从头顶直直的往上拉你的头，脖子和后背。

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Next, Thread A resumes, and clearly *top and n->next do not match for this thread, because Thread B modified the contents of the top location.

接下来，线程 A 恢复执行，显然对于这个线程 *top 和 n->next 不匹配，因为线程 B 修改了 top 位置的内容。

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Incoming messages pop up on the top right in the form of what Facebook calls chat heads, which are bubbles that each represent a particular conversation thread and is displayed via a pop-over dialog box.

ENGADGET: Facebook Home hands-on (video)