Computer - Operating System

It is a program with following features:

  • An operating system is a program that acts as an interface between the software and the computer hardware.

  • It is an integrated set of specialised programs that are used to manage overall resources and operations of the computer.

  • Objectives of Operating System

    • To make a computer system convenient to use in an efficient manner

    • To hide the details of the hardware resources from the users

    • To provide users a convenient interface to use the computer system

    • To act as an intermediary between the hardware and its users and making it easier for the users to access and use other resources

    • To manage the resources of a computer system

    • To keep track of who is using which resource, granting resource requests, according for resource using and mediating conflicting requests from different programs and users

    • To provide efficient and fair sharing of resources among users and programs

  • Characteristics of Operating System

    • Memory Management -- keeps tracks of primary memory i.e. what part of it is in use by whom, what part is not in use etc. and allocates the memory when a process or program requests it.

    • Processor Management -- allocates the processor(CPU) to a process and deallocates processor when it is no longer required.

    • Device Management -- keeps track of all devices. This is also called I/O controller that decides which process gets the device, when, and for how much time.

    • File Management -- allocates and de-allocates the resources and decides who gets the resources.

    • Security -- prevents unauthorized access to programs and data by means of passwords and similar other techniques.

    • Job accounting -- keeps track of time and resources used by various jobs and/or users.

    • Control over system performance -- records delays between request for a service and from the system.

    • Interaction with the operators -- The interaction may take place via the console of the computer in the form of instructions. Operating System acknowledges the same, does the corresponding action and informs the operation by a display screen.


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