Concepts

Operating System Overview

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An operating system:

• Makes it easy to use programs.
• Allows multiple programs to run simultaneously without clashes. They share the same memory and their data doesn't get scrambled together.
• Facilitates communication between the computer and devices attached to it.
• Gives the user an easy interface for interacting with the device's hardware.

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Processes

Source : ahmaazouzi from Github

Processes are probably the most basic and powerful abstraction provided by operating systems. In this part, you will learn:

• What is a process and how an OS uses it.
• Important UNIX system calls, designed specifically for creating and managing processes.
• Direct execution, and how the OS uses it to create efficient processes that it can still control and supervise.

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Scheduling

Source : ahmaazouzi from Github

Scheduling basically refers to the high-level policies used by the OS to manage slices of time it allots to each process.

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