2. Flow of presentation
Introduction
Structure of OS
Main function of Operating system
Some popular Operating system
Conclusion
3. 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.
4. 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.
5. Structure of OS
Users
Other system
Operating System
Computer Hardware
6. 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..)
7. 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.
8. 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.
9. 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.
