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3 definition of operating systems


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3 definition of operating systems

  1. 1. OPERATING SYSTEMS Operating SystemsBasics of Operating SystemsDefinition of Operating Systems 1
  2. 2. RecapIn the last class, you have learnt about • History of Operating System • Types of Computers • Different types of Operating Systems 2
  3. 3. Objectives On completion of this period, you would be able to know• System Resources• Types of Software• Operating System viewed from User and System perspective• Goals of Operating System• Definition of Operating System 3
  4. 4. System ResourcesWhat is a resource?• A resource, or system resource, is any physical or virtual component of limited availability within a computer system• System resources include – Hardware – Software 4
  5. 5. Components of a Computer SystemA computer system can be divided into four components• Hardware• Operating System• Application Programs• Users 5
  6. 6. Abstract View of a Computer SystemUser 1 User 2 User 3 User n System and Application Programs Operating System Computer Hardware 6
  7. 7. Hardware• Physical components of a computer system Ex: - I/O devices, Memory devices, CPU etc., 7
  8. 8. Software• Set of programsProgram: - A finite set of sequence of instructions 8
  9. 9. Types of Software• System Software• Application Software 9
  10. 10. System SoftwareIt provides an interface between software and hardware• Operating System• Assembler• Compiler• Interpreter• Linker• Loader etc., 10
  11. 11. Application SoftwareDesigned to work on an operating system MS-Office Suite MS-Word MS- Power point MS-Excel MS-Access Databases Utilities etc., 11
  12. 12. Operating System• It is an important part of almost every computer system• It is easier to define an Operating System by what it does than by what it is• It provides an environment to other programs to do useful work 12
  13. 13. Design of Operating System• User Point of View• Computer System Point of View 13
  14. 14. OS - User Point of View• For ease of use• To maximize resource utilization• To compromise between usability and resource utilization 14
  15. 15. OS - System Point of View• OS as a resource allocator• OS as a manager of these resources• OS as a controller of I/O devices and user programs• Operating system as a control program, which manages the execution of user programs 15
  16. 16. Goals of Operating System• To provide – convenience for the user – Efficient operation of the computer system• Operating system is a way to solve the problem by providing a usable computing system 16
  17. 17. Definition• Operating system is a system software• It coordinates between hardware and software• It is an interface between hardware and software• It controls and manages resources• It executes programs on behalf of users 17
  18. 18. Summary• Components of computer system – Hardware, Software, Users• Hardware : Physical components• Software : Set of programs• Operating System goals: Ease of use, efficient operation of the computer system• OS is a system software, which coordinates, manages and controls resources on behalf of users 18
  19. 19. Frequently Asked Questions1. List the components of a computer system2. What should be the Operating System from user and system point of view?3. Define Operating System 19
  20. 20. Quiz1. Which is the System Software? a. MS-WORD b. MS-EXCEL c. WINDOWS d. MS-ACCESS 20
  21. 21. Quiz2) Which one is not a system software? a) Databases b) Interpreter c) Compiler d) Assembler 21
  22. 22. Other subject materials• Web designing• Micro processors• C++ tutorials• javahome 22