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操作系统是管理计算机硬件和软件资源的计算机程序。用的是软件,普通的日常使用软件是应用软件,os是系统软件。

操作系统安装在硬件上,为软件和用户提供接口和服务。

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os的目标:管理系统资源(有效性);用户友好(方便);作为扩展机器(可扩展性、开放性)

操作系统的功能:

1.作为计算机系统资源的管理者;

(1)处理器管理

过程控制、过程同步、过程通信、调度

(2)内存管理

内存分配、内存保护、地址映射、内存扩展

(3)输入输出设备管理

管理、设备分配、设备搬运

(4)文档管理

文件存储空间管理、目录管理、文件读/写管理和保护。

2.作为用户和计算机硬件系统之间的接口;

(1)程序接口(如微信、QQ等应用软件)

(2)命令界面(打开文件目录、cmd等操作)

(3)图形用户界面:图形用户界面

3.实现计算机资源的抽象。

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