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Operating system

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Operating system

  1. 1. Operating system is a system software which is interface between computer user and computer hardware. It is master controller of the computer system because it is responsible for manage all hardware and software.
  2. 2. Functions of operating system Input and output control: The problem with input and output is that different input and output devices have different characteristics ,and run at different speeds. The I/o control module of an operating system is responsible for making them independent from the point of view of the programmer. And it is also responsible for manage and control the all input and output devices which are connected to the computer.
  3. 3. Memory management:  Most of computer nowadays are capable of holding several program in memory simultaneously so that user can switch from one application to another. The operating system is responsible for allocating the memory space to all the file and folders in a computer system.
  4. 4. Resource allocation and scheduling  large computer system which are capable of running several program at once . The operating system is responsible for allocating processing time , memory and input and output resource to each one while one program is executing. The operating system is responsible for scheduling the I/o devices for the next job.
  5. 5. Backing store management:  In the backing store of a computer bulk of the data and program being processed are kept. The operating system is responsible for store the program which are executing as a backup purpose.
  6. 6. Virtual memory and paging:  Virtual memory is a technique for making a computer appears to have more memory that it actually has. The operating system is responsible for making the more memory that it actually has. And paging is a system , in this system each process is divided in to fixed number of blocks as per the need of (RAM). The operating system is responsible for making the virtual memory.
  7. 7. Protection and security  The operating system is responsible for protecting all the data and information by inserting password in computer system. The operating system allowed user to insert password in the computer system.
  8. 8. Types of operating system The operating system is divided in to two types. On the bases of user interface. On the bases of user interface operating system is divided in to two types 1-User interface CUI(command user interface) GUI(graphics user interface) 2-process method Single user Multiuser
  9. 9. Types of operating system  Single user operating system  Multi user operating  Multiprogramming  Multi tasking.  Real-time
  10. 10. Types of operating system  Single operating : Single user operating systems are those operating system which allow only one user to access a computer and to operate a computer. It means only one user can execute one program at time such operating systems are known as single user operating system. For example Ms Dos.  Multi user operating system: Multi user operating system systems are those operating system which allow to access more then two user simultaneously. It means those operating system which can execute instruction given by more then two user at the same time is known as Multi user operating system. For example Unix, linux.
  11. 11. Types of operating system  Multi programming: Multi programming operating systems are those operating system which can allow more then two program at the same time . It means these operating system which execute more then two program at the same time is called multi programming operating system. for example Windows NT, Vista etc.
  12. 12. Types of operating system  Multi tasking operating: Multitasking operating systems are those operating system which can allow more then two task at the same time is called multi tasking operating. For example if a user watching a video and at the same time he /she listening to music throw the head phone and and chatting with friends such operating systems are known as multitasking operating system.
  13. 13. Types of operating system  Real time operating system: Real time operating systems are those operating system which allow to execute a instruction with real time it means on the exact time they are also known as online operating system.
  14. 14. User interface  on the basis of user interface operating systems are divided in to two types  CUI  GUI  CUI : CUI stands for command user interface. This operating system only uses command to execute any program and to perform any instruction. This operating system does not support mouse, picture, image and graphics. For example MS DOS, this is a single user operating system it is a product of micro soft corporation limited USA.
  15. 15. User interface  GUI: It stands for graphical user interface. This operating system support WIMP, which means Window, Icon, Mouse ,Pointer etc. This operating system takes instruction from the mouse and it support image, graphics etc. These operating system multi user and multi programming. For example vista, Linux etc

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