Spinlocks?

今天去考中興的時候寫計算機系統相當的不順手，到最後實在寫不出東西來，又還沒到提早交卷的時間，於是開始想東想西。只是越想越氣，就抓了一題不會寫的題目來亂掰。題目是這樣的：please explain why spinlocks are useful on MP systems but not on single-processor systems?

我想了個答案。
答案如下：
" 'cause it spins. In single-processor systems, you can't make it spin from nowhere, so you gotta have two of them to make them spin, that's why spinlocks are useful in multi-processor systems. The way ones spin spins!"


希望不會因為寫了這個答案被扣分。

想到另外一題要寫出電路的簡化邏輯表示式...我差點給他寫.."either 1 or 0"....