《Operating System Concepts》学习第 22 天，p200-p202 总结，总计 3 页。

一、技术总结

1.CPU-I/O burst

(1)CPU burst

Scheduling process state in which the process executes on CPU.

(2)I/O burst

Scheduling process state in which the CPU performs I/O.

2.race condition

A situation in which two threads are concurrently trying to change the value of a variable.

二、英语总结(生词：2)

1.burst

(1)burst

vi/vt. to break open suddenly(打开，裂开)。

c. a sudden increase in something, especially for a short period。

(2)示例

Process execution begins with a CPU burst. That is followed by an I/O burst, which is followed by another CPU burst, then another I/O burst, and so on(《Operating System Concepts》第 200 页)。

在上面这个例子中，burst 是一种比喻用法，因为 CPU 或者 I/O 并不会“裂开”，表示一种“short, intense act”即 “a sudden increase in something, especially for a short period”。

2.invocation

(1)invoke: in-(“upon”) + vocare(“to call”)

vt. to call on sth(召唤) ，to use sth(调用)。

(2)invocation: the noun form of invoke

c/u. the action of invoking sb or sth.

(3)示例

When a process switches from the running state to the waiting state (for example, as the result of an I/O request or an invocation of wait() for the termination of a child process(《Operating System Concepts》第 200 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

今天没有什么想说的。

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

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