《Operating System Concepts》学习第 30 天，p331-p353 总结，总计 23 页。

一、技术总结

1.lockdep 工具

2.claim edge

3.banker's algorithm

A deadlock avoidance algorithm, less efficient than the resource-allocation graph scheme but able to deal with multiple instances of each resource type.

二、英语总结(生词：2)

1.middle vs midst

(1)middle

s. the central point(中间的)；adj. in the central point(中间的)。

(2)midst

u/prep. among(在......之中)。

(3)middle vs midst

之所以有这个疑问是初次查字典的时候，各词典都写着 midst 的意思是“u. the middle point”，这让人看着很懵，难懂是一样的意思？其实不是。middle 是真正的“centre, central(中间的)”，而 midst 是“among(在......之中)”，即： Midst means when you are in the area no matter where you are in whether in the middle or around the edge, while in the middle meaning is exactly you are in the center of something which also means you are in between something that equals in the distance!

示例：

1)In the sequence a, b, c, d, e, the middle letter is c.

在上面这个例子中，因为 c 在中间位置，所以用 middle。

2)We never gave up hope in the midst of our troubles(我们在困境中从未放弃希望)。

在上面这个例子中，表示的是 among, 所以用 midst 更合适。

3)If the process was in the midst of updating a file, terminating it may leave that file in an incorrect state()。

2.bare machine & bare-machine

(1)bare machine(裸机)

In information technology, bare machine (or bare-metal computer) is a computer which has no operating system。

(2)bare-machine

adj.

示例：The memory-management algorithms vary from a primitive bare-machine approach to a strategy that uses paging(《Operating System Concepts》第 342 页)。

(3)bare-metal(裸金属)

adj.

关于英语的注解同步更新汇总到 https://github.com/codists/English-In-CS-Books 仓库。

三、其它

第 8 章(Deadlocks)简评：介绍了 deadlock prevention, deadlock avoidance, deadlock detection。这一章看完依然是晕乎乎的。

四、参考资料

1. 编程

(1) Abraham Silberschatz，Peter Baer Galvin，Greg Gagne《Operating System Concepts》：https://book.douban.com/subject/30272539/

2. 英语

(1) Etymology Dictionary：https://www.etymonline.com

(2) Cambridge Dictionary：https://dictionary.cambridge.org

欢迎搜索及关注：编程人(a_codists)