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Operating SystemThe interface between the user and the computer hardware.

A program that acts as an intermediary between a user of a computer and thecomputer hardwareOperating 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.

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Operating System Structure

KernelCore of operating system, responsible for

loading operating system

User interface

User interact with operating system

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Operating System Functions

Functions ofOS

Intermediator Process

Mgmt

File MgmtMemory

Security

JobScheduling

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Intermediator : Facilitates easy communicationbetween the computer system and the computeroperator (human). It also establishes datasecurity and integrity.Process Mgmt : that is, assignment of processorto different tasks being performed by thecomputer system.

File Mgmt : that is, the storage of file of variousstorage devices to another. It also allows all filesto be easily changed and modified through theuse of text editors or some other filesmanipulation routines.

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Functions(Cont) Memory Mgmt : that is, allocation of mainmemory and other storage areas to the system

programs as well as user programs and data.Security : Operating systems provide passwordprotection to keep unauthorized users out of thesystem.Job Scheduling: it determines and maintainsthe order in which jobs are to be executed in thecomputer system.

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Operating system

GUI Multiuser Multitasking Multiprocessing Multithreading

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Multi userMulti-user - A multi-user operating system allowsfor multiple users to use the same computer at thesame time and/or different times.

Example: LINUX

http://www.computerhope.com/unix.htm

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Multi Tasking An operating system that is capable of allowingmultiple software processes to run at the same time.

Below are some examples of multitasking operatingsystems.

Unix Windows XP, Vista

http://www.computerhope.com/unix.htmhttp://www.computerhope.com/win2000.htmhttp://www.computerhope.com/unix.htmhttp://www.computerhope.com/unix.htmhttp://www.computerhope.com/win2000.htmhttp://www.computerhope.com/unix.htmhttp://www.computerhope.com/unix.htm

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Multi Processing An operating system capable of supporting andutilizing more than one computer processor.more than one CPUs that can be shared

Below are some examples of multiprocessing operatingsystems.LinuxUnix

Windows 2000

http://www.computerhope.com/unix.htmhttp://www.computerhope.com/unix.htmhttp://www.computerhope.com/win2000.htmhttp://www.computerhope.com/win2000.htmhttp://www.computerhope.com/win2000.htmhttp://www.computerhope.com/unix.htmhttp://www.computerhope.com/unix.htmhttp://www.computerhope.com/unix.htm

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Multi Threading

Smaller parts of a program are loaded when needed by OSOperating systems that allow different parts of a

software program to run concurrently Operating systems that would fall into this category are:

E.GLinux

Unix Windows 2000

http://www.computerhope.com/unix.htmhttp://www.computerhope.com/unix.htmhttp://www.computerhope.com/win2000.htmhttp://www.computerhope.com/win2000.htmhttp://www.computerhope.com/unix.htmhttp://www.computerhope.com/unix.htmhttp://www.computerhope.com/unix.htm

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DESKTOPSERVER

MOBILE

Typesof OS

DESKTOP

SERVERMOBILE

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Desktop Operating System

Operating System

Windows Mac Linux

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Advantages of Windows OS

Windows

Easy to use

Update

SupportingGaming

Familiar

Advantages

Windows

expensive

Not secureNot stable

Disadvantages

By MICROSOFT co-operation

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Advantages & Disadvantages of MAC OS

Mac

GreatGUI

Better tographic

designer

Secure

Stable

Advantages

Mac

Notgaming

Not allsoftware

run

Difficultmouse(oneclick)

expensive

Disadvantages

By APPLE Co-operation

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Linux

Free

Stable

SecureSource Code

Low pcrequirement

Advantages Disadvantages

Linux

Not allsoftwarerun

Notsupport

Hard tolearn,

use and

install

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Desktop Operating System

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Server Operating System

Server operating systems are designed to provide platforms formulti-users , for critical, network applications. Their main

purpose is to provide security, stability and collaboration. Mostof them come with a pack of dedicated software tools such asWeb servers, e-mail agents and terminal services The commonapplications for server OSes are:File and printer sharingApplication services (including databases)Web site servicesE-mail, groupware and messagingTerminal servicesCaching

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Server Needs

ServerOperating

System

Administration

Security

StabilityPerformance

Feature

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Mobile Operating System

operating system that controls a mobile device

Mobile OS

SymbianOS iPhone OS RIMBlackBerry WindowsMobile Linux Palm OS

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Conclusion

As Operating System controls and coordinatesthe use of the hardware among the variousapplications programs for various uses, we cansay that it plays a very important role in computer

system.