Operating System Notes 1. Operating System notes

Operating System Notes 1. Operating System notes
Introduction to operating systems

A computer system consists of two parts: hardware and software. Hardware refers to various components of a computer, including memory, processor, input/output device, power supply, and chassis. Software refers to a set of programs and data that exist in or out-of-memory computer systems.

Computer software is divided into system software and application software.

System software is a system support program stored in computer hardware (such as hard disks and floppy disks) for the convenience of users. Main system software includes: Operating System, compiling and interpreting program, assembler program, connection loader, editing program and device driver program.

Application Software is a software purchased or developed by a computer vendor or another software vendor for the purpose of special applications. Typical examples include: database management software, image processing software, various office software and anti-virus software.

The operating system is a primary, basic, and important system and the largest and most complex system software.

1.1 operating system definition

Generally, an operating system is defined as a set of programs and data structures used to control and manage computer system resources.

(1) system viewpoint-computer resource management

In computer systems, CPU is the core of computer hardware and the heart of computer systems. operating systems are the core of computer software, the brain of computer systems, and the control center of the entire system, it is the most important and complex system software in computer or intelligent control and management systems.

Programs Running in computer systems compete for limited computer resources all the time. The operating system is used to organize and manage hardware and software resources of the entire computer system, and allocate system resources between users and programs, make it coordinate and efficiently complete various complex tasks.

(2) user opinion-user's computer interface

Through the operating system, computers can provide more and better services. Different operating systems are displayed in front of users and are completely different in two categories of "virtual" computers. Therefore, the operating system is an interface between users and computer hardware. You can obtain the services provided by the computer system in the following ways.

① Command method: Use