Operating System 2 Overview

OPERATING SYSTEM OBJECTIVES AND FUNCTIONS

An OS is a program that controls the execution of application programs and acts as an interface between applications and the computer hardware. Objectives: Convenience Efficiency Ability to evolve

Briefly, the OS typically provides services in the following areas: Program development Program execution Access to I/O devices Controlled access to files System access Error detection and response Accounting

THE EVOLUTION OF OPERATING SYSTEMS

Serial Processing Simple Batch Systems Multiprogrammed Batch Systems Time-Sharing Systems

Five major theoretical advances 1. Processes Three major lines of computer system development created problems in timing and synchronization that contributed to the development of the concept of the process:multiprogramming batch operation, time sharing, and real-time transaction systems problems: Improper synchronization, Failed mutual exclusion, Nondeterminate program operation, Deadlocks 2. Memory management Process isolation Automatic allocation and management Support of modular programming Long-term storage

Cont.. 3. Information protection and security Availability Confidentiality Data integrity Authenticity 4. Scheduling and resource management\ Fairness Differential responsiveness Efficiency 5. System structure

Different approaches on os Microkernel architecture Multithreading Symmetric multiprocessing Distributed operating systems Object-oriented design

MICROSOFT WINDOWS OVERVIEW

TRADITIONAL UNIX SYSTEMS

Modern Unix & Linux

As UNIX evolved, the number of different implementations proliferated, each providing some useful features. There was a need to produce a new implementation that unified many of the important innovations, added other modern OS design fetures, and produced a more modular architecture.

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