《Operating System Concepts》阅读笔记：p808-p820

《Operating System Concepts》学习第 71 天，p808-p820 总结，总计 13 页。

一、技术总结

1./proc

/proc 是一个虚拟的文件系统。

二、英语总结(生词：2)

1.unidirectional

(1)unidirectional: uni-("one") + directional

adj. moving or operating in a single direction(单向的)。

(2)示例

Traditionally, these requests have been scheduled according to a unidirectional-elevator (C-SCAN) algorithm that exploits the order in which requests are inserted in and removed from the lists(《Operating System Concepts》第 811 页)。

2.drawback

(1)drawback: draw("pull") + back("opposite of forward")

c. drawback literally means sth that pulls back--a disvantage or obstacle. a disvantage or the negative part of a situation(缺点，不利因素)。

(2)示例

Historically, UNIX implementations of this mechanism have had several drawbacks(《Operating System Concepts》第 816 页)。

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 20 章(The Linux System)简评：从 History, Process Manage, Scheduling 等方面介绍 Linux 系统，放在整本书的末尾感觉有些画蛇添足，因为这些内容在之前都有介过，没有太大的不同。

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

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