The document discusses the role and functions of an operating system. It notes that an operating system acts as an intermediary between the user and computer hardware. It executes programs, makes the computer convenient to use, and efficiently uses hardware resources. The operating system controls and coordinates how hardware resources like the CPU, memory and I/O devices are used by different applications and users. It can be viewed from the user perspective and system perspective. The operating system manages resources, controls program execution and device operations, and acts as the kernel that always runs.

1. Operating System Concepts
Mrs.G.Chandraprabha,M.Sc.,M.Phil.,
Assistant Professor
Department of Information Technology
V.V.Vanniaperumal College for Women
Virudhunagar

2.  A program that acts as an intermediary between a
user of a computer and the computer hardware.
 Operating system goals:
 Execute user programs and make solving user problems
easier.
 Make the computer system convenient to use.
 Use the computer hardware in an efficient manner.
Operating System Concepts

3. 1.Hardware – provides basic computing resources
(CPU, memory, I/O devices).
2.Operating system – controls and coordinates the
use of the hardware among the various application
programs for the various users.
3.Applications programs – define the ways in which
the system resources are used to solve the
computing problems of the users (Word
processors, Spreadsheets, compilers, and web
browsers etc.,).
4.Users (people, machines and other computers).
Operating System Concepts

4. Operating System Concepts

5.  Operating system can be explored from
two view points.
User view
System view
Operating System Concepts

6. Operating System Concepts
 PC Computer systems->OS is designed for the
convenience to all users
 Main frame systems ->OS is to be an effective
utilization of the hardware
 Handheld systems-> some are connected to
networks directly through wireless and
more convinience and effective utilization of
resources.

7. Operating System Concepts

8. Operating System Concepts

9.  Resource allocator – manages and allocates
resources.
 Control program – controls the execution of user
programs and operations of I/O devices
 Kernel – the one program running at all times (all
else being application programs).
Operating System Concepts

10. Operating System Concepts