Basic CS-Operating System [3i Infotech Placement]: Sample Questions 26 - 26 of 89

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Question 26

Operating System
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Describe in Detail

Essay▾

What is an OS? What are components of OS?

Explanation

Understanding of Operating System
  • OS program acts as an interface between the user and the computer hardware controlling the execution of all kinds of programs.
  • Used to run other programs and applications.
  • Performs basic tasks-
    • Recognizing input from the keyboard
    • Sending output to the display screen
    • Keeping track of files and directories on the storage drives
    • Controlling peripheral devices, such as printers.

Components of Operating Systems

  • Kernel:
    • Provides basic control to all of the computer՚s hardware devices.
    • Manages memory for programs in the RAM.
  • Program execution:
    • Provides an interface between an application program and the computer hardware.
    • Allows application program to interact with the hardware.
  • Interrupts:
    • Automatically saves local register contexts, and running specific code in response to events.
    • Computers support hardware interrupts, and allow the programmer to specify code run when that event takes place.
  • Memory management
  • Multitasking, disk access and file system management.
  • Networking & security
  • Graphical user interface:
    • The modern computer systems support graphical user interfaces.
    • Evolve over time.

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