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All multiprogramming operating systems, from single-user systems such as Windows for end users to mainframe systemssuch as IBM’s mainframe operating system z/OS which can support thousands of users, are built around the concept ofthe process. Most requirements that the OS must meet can be expressed with reference to processes. We can also thinkof a process as an entity that consists of a number of elements Why are two modes (user and kernel) needed?

All multiprogramming operating systems, from single-user systems such as Windows for end users to mainframe systemssuch as IBM’s mainframe operating system z/OS which can support thousands of users, are built around the concept ofthe process. Most requirements that the OS must meet can be expressed with reference to processes. We can also thinkof a process as an entity that consists of a number of elements Why are two modes (user and kernel) needed?

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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All multiprogramming operating systems, from single-user systems such as Windows for end users to mainframe systemssuch as IBM’s mainframe operating system z/OS which can support thousands of users, are built around the concept ofthe process. Most requirements that the OS must meet can be expressed with reference to processes. We can also thinkof a process as an entity that consists of a number of elements

Why are two modes (user and kernel) needed?

 

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