OPERANTING SYSTEM -OS

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Operating system - OS

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OPERANTING SYSTEM -OS

Types of Mobile Operating Systems

9. Windows Mobile (Windows Phone)

8. webOS (Palm/HP)

7. Symbian OS (Nokia)

6. Palm OS (Garnet OS)

5. MeeGo OS (Nokia and Intel)

4. iPhone OS / iOS (Apple)

3. BlackBerry OS (Research In Motion)

2. Bada (Samsung Electronics)

1. Android OS (Google Inc.)

• Real time

Responds to input instantly. General-purpose operating systems, such as DOS and UNIX, are not real-time.

Multithreading

Allows different parts of a single program to run concurrently

Multitasking

Allows more than one program to run concurrently

Multiprocessing

Supports running a program on more than one CPU

Multi-user

Allows two or more users to run programs at the same time. Some operating systems permit hundreds or even thousands of concurrent users.

Classification of Operating systems

The three most popular types of operating systems for personal and business computing include Linux, Windows and Mac

Linux

Linux is a freely distributed open source operating system that runs on a number of hardware platforms

Mac

OS is the official name of the Apple Macintosh operating system.

Windows

is a family of operating systems for personal and business computers.

A Software Platform for Applications

Operating systems provide a software platform on top of which other programs, called application programs, can run. The application programs must be written to run on top of a particular operating system. Your choice of operating system, therefore, determines to a great extent the applications you can run. For PCs, the most popular operating systems are DOS, OS/2, and Windows, but others are available, such as Linux.