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What is an operating system?

  • An OS is a program that acts an intermediary between the user of a computer and computer hardware.
  • A program that runs on the “raw” hardware and supports
             –Resource Abstraction (across different types of hardware)
             –Resource Sharing
  • Manages the hardware resources
             –Each program gets time with the resource
             –Each program gets space on the resource

Modern Operating Systems
  • Mainframe operating systems: MVS (Multiple Virtual Storage)
  • Multiprocessor operating systems: Cellular IRIX
  • Server operating systems: FreeBSD, Solaris
  • Personal computer operating systems: Windows, Unix, Linux
  • Real-time operating systems: VxWorks
  • Embedded operating systems: Inferno, Cisco IOS

Goals of an Operating System
  • Simplify the execution of user programs and make solving user problems easier.
  • Use computer hardware efficiently.
  • Allow sharing of hardware and software resources.
  • Make application software portable and versatile.
  • Provide isolation, security and protection among user programs.
  • Improve overall system reliability
Why should we know about Operating Systems?
  • Need to understand interaction between the hardware and applications
    • New applications, new hardware..
  • Need to understand basic principles in the design of computer systems
    • efficient resource management, security, flexibility
  • Increasing need for specialized operating systems
    • e.g. embedded operating systems for devices -cell phones, sensors and controllers
    • real-time operating systems -aircraft control, multimedia services

Embedded Operating Systems








The zoo of Operating Systems
  • Windows 98 Second Edition
  • Windows Millennium Edition
  • Windows 2000 Server with SP4
  • Windows XP Professional with SP2
  • Windows 2003 Server with SP1 or SP2 or R2
  • Windows Vista
  • Windows 7
  • Red Hat Enterprise Linux 3/4
  • Fedora Core Linux
  • Sun Solaris

The zoo of Application Software
  • MS Office 2000/XP/2003/2007
  • Open Office
  • Database Servers like Oracle10g, MS SQL Server 2005
  • Content Management Systems like PostNuke, PHPNuke
  • Encrypting Software like Truecrypt, Cryptainer
  • Shredder Software like Eraser
  • Antivirus Software like Symantec-Norton AV, McAfee, ClamAV, Kaspersky, Trend Micro
  • Multimedia Software like WinAmp, Media Player
  • Office Automation tools like Schedulers, Calendars, Mailers
  • Web Browsers like IE, Opera, FireFox, Netscape
  • Personal Fire Walls like ZoneAlarm

2 comments :

Anonymous said...

good for beginners..

sandeep said...

Good example of embedded systems.

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