Java notes: Operating system

Q1) What is an operating system? Give some examples.

A1) The operating system (OS) is the most important program that runs on a computer. The OS manages and controls that computer’s activities. Operating systems for general-purpose computers include Microsoft, Windows, Mac OS, and Linux.

Application programs such as web browsers and word processors cannot run on a computer without an operating system.

Q2) List the major tasks of an operating system.

A2) Major tasks of an OS:

  1. Controlling and monitoring system activities
  2. Allocating and assigning system resources
  3. Scheduling operations
Q3) What is multiprogramming?

A3) Multiprogramming allows multiple programs such as Microsoft word, email, and web browsers to run simultaneously by sharing the same CPU. A multiprogramming OS takes advantage of the idle time of the CPU by allowing multiple programs to use the CPU. For example, multiprogramming allows the user to use a word processor to edit a file at the same time the web browser is downloading a file.

Q4) What is multithreading?

A4) Multithreading allows for a single program to run multiple tasks at the same time. For example, a word-processing program allows users to simultaneously edit text and save it to a disk.

Q5) What is multiprocessing?

A5) Multiprocessing is used to run multiple programs concurrently using multiple processors.

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