Question

what does an operating system need in order to function properly?

what are the logical requirements of it?

Answer 1

Def:Operating system is a program that acts an interface between the user and server.

An operating system is the most important software that runs on a computer's. The fundamental goal of a computer system is to execute programs and t make tasks easier.Operating system is a software which control and manage the set of resources.It utilize every part of a computer in a effective manner.

Needs:

• Platform for application programs
• User interface
• Managing input and output units
• Multitasking

Some of the functions of an Operating System:

• Process Management
  • Shortest Job First(SJF)
  • Round Robin scheduling
  • Priority based scheduling(Non-Preemptive)
• Device Management
• Buffering
• Memory Management
• File Management
• Loading and Execution
• Disk Management

Key Requirements:

1. Abstraction
2. Mechanisms
3. Policies

In Abstraction we have Process,thread,file,socket,memory.

In Mechanisms we have create,write,schedule,open,allocate.

In Policies we have Least Recently Used (LRU), Earliest deadline first (EDF)