2019-06-15

23:16:13

1. What are the two main functions of an operating system?

1. An operating system must provide the users with an extended machine, and it must manage the I/O devices and other system resources. To some extent, these are different functions.两个功能：1.管理资源 2.提供抽象。

在资源管理观点中，操作系统的任务是有效地管理系统的各个部分。在扩展的机器观点中，系统的任务是为用户提供比实际机器更便于运用的抽象。这些抽象包括进程，地址空间以及文件。

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2. In Section 1.4, nine different types of operating systems are described. Give a list of applications for each of these systems (one per operating systems type).

Mainframe operating system: Claims processing in an insurance company（在保险公司处理索赔）