Operating System

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What is an OS?

A software that communicates to a hardware and allows other programs to run.

Functions of OS:

- Multi-task

- Multiprogram

- Batch processing

- Error handling

- Processor management

- Memory management

- Management of user profiles

Types of OS:

1. Real-time processing

A type of OS that reacts instantly to the input. Used while booking seats, Bank transactions and stock controlling...

Real-time processing uses its sense and then feed back loops to the monitor. Used while monitoring the temperature in a greenhouse, controlling temperature in an AC or while controlling traffic lights.

2. Batch Processing

Jobs and tasks are collected in batch and then processed in one go. Generally used while processing electricity bills and payrolls. Batch processing can be process jobs of similar inputs, processing and output without any human interventions.

3. Multitasking OS

A type of OS where jobs and tasks are being performed by the CPU simultaneously by switching between them.

4. Multiprogramming OS

A type of OS where two or more programs resides in the memory and share the processor. The OS assumes a single share and deals with different programming language at the same time.

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