Name:- Nitish Xavier Tirkey

F.Y.BCA

Date:- 4th October, 2010

Flow of presentation

Introduction

Structure of OS

Main function of Operating system

Some popular Operating system

Conclusion

Introduction

Operating system is an integrated set of program that controls the resources of a computer system and provides its users with an interface or virtual machine that is easier to use than the bare machine

Operating System is a software, which makes a computer to actually work.

It is the software the enables all the programs we use.

OS acts as an interface between the application programs and the machine hardware.

Structure of OS

The two primary objectives of an operating system are:

(1). Make a computer system easier to use:- An operating system hides details of hardware resources from programmers and other users and provides them with a convenient interface for using a computer system.

(2). Manage the resources of a computer system:- An operating system manages all the resources of a computer system. Efficient and fair sharing of system resources among users and/or programs is a key goal of all operating systems.

Structure of OS

Users

Other system

Operating System

Computer Hardware

Main function of Operating system

A separate module of operating system software performs each of the function:

(1).Process management:- Process management module takes care of creation and deletion of processes, and providing mechanisms for synchronization and communication among processes.

(2). Memory management:- Memory management module takes care of allocation and de-allocation of memory space to programs in need of this resources.

(3). File management:- It takes care of file-related activities such as organization storage, retrieval, naming, sharing, and protection of files.

(Contd..)

Main function of Operating system

(4). Security:- Security module protects the resources and information of a computer system against destruction and unauthorized access.

(5). Command interpretation:- Command interpretation module takes care of interpreting user commands, and directing system resources to process the commands.

Some popular Operating system

Operating System can also be classified as:-

(1). Single User Systems:-They are popularly associated with Desk Top operating system which run on standalone systems where no user accounts are required.

Example: DOS.

(2). Multi User Systems:-Provides regulated access for a number of users by maintaining a database of known users. Refers to computer systems that support two or more simultaneous users.Example: Unix, Microsoft Windows NT.

Conclusion

Without Operating system the computers cannot run the application and we cannot do work in the computer.

Therefore Operating system is very important in computer.

Thank you