AN INTRODUCTION TO OPERATING SYSTEMS ? What is operating system ?

There are two type of software Application software and System software

Application software performs specific task for the user.

System software operates and controls the computer system and provides a platform to run

application software.

what is an operating system -

An operating system is a piece of software that manages all the resources of a computer

system,both hardware and software, and provides an environment in which the user can

execute his/her programs in a convenient and efficient manner by hiding underlying

the complexity of the hardware and acting as a resource manager.

Why OS Needed in computers?

1. What if there is no OS?

a. Bulky and complex app. (Hardware interaction code must be in app’s code base)

b. Resource exploitation by 1 App.

c. No memory protection.

2. What is an OS made up of?

a. Collection of system software.

The function of Operating system -

- Access to the computer hardware.

- interface between the user and the computer hardware

- Resource management (Aka, Arbitration) (memory, device, file, security, process etc) - Hides the underlying complexity of the hardware. (Aka, Abstraction) - facilitates execution of application programs by providing isolation and protection.

User

Application programs

Operating system

Computer hardware

The operating system provides the means for proper use of the resources in the operation of the computer system.

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