1th Chapter-Introduction to operating system

1. Operating System Definition: The operating system is a computer system software, it is such a collection of program modules-they can effectively organize and manage the computer system hardware and software resources, reasonably organize the work flow of computers, control program implementation, and provide users with a variety of service functions, Enable users to use the computer flexibly, conveniently and efficiently, and to make the whole computer system run efficiently.

2. Characteristics of the operating system:

Concurrency: There are several programs running at the same time in a computer system. Concurrency between the user program and the user program, and concurrent execution between the user program and the operating system program.

Sharing: Mutually exclusive sharing (printers, tape drives, scanners, critical resources), while sharing (hard disks).

Randomness: various possibilities.

3. Functions of the operating system:

1th Chapter-Introduction to operating system