Understanding Operating Systems Flynn Mc Hoes Part I

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Understanding Operating Systems Flynn & Mc. Hoes Part I: Operating Systems Theory 1. Overview

Understanding Operating Systems Flynn & Mc. Hoes Part I: Operating Systems Theory 1. Overview 2. Memory Management, Early Systems 3. Memory Management, Recent Systems 4. Processor Management 5. Process Management 6. Concurrent Processes 7. Device Management 8. File Management 9. Network Organization Concepts 10. Management of Network Functions 11. System Management

Understanding Operating Systems Part II: Operating Systems in Practice 12. 13. 14. 15. 16.

Understanding Operating Systems Part II: Operating Systems in Practice 12. 13. 14. 15. 16. MS-DOS Operating System Windows 2000 UNIX/Linux Operating System Open. VMS Alpha Operating System IBM OS/390 Operating System Understanding Operating Systems 2

Chapter 1: Overview • Introduction • Operating System Components • Machine Hardware • Types

Chapter 1: Overview • Introduction • Operating System Components • Machine Hardware • Types of Operating Systems • Brief History of Operating Systems Development • Conclusion Understanding Operating Systems Software Components Developed Hardware Components Developed Operating Systems Developed 3

Components of an Operating System Operating system – part of the computing system that

Components of an Operating System Operating system – part of the computing system that manages all of the hardware and all of the software – Controls every file, device, section of main memory & every nanosecond of processing time Operating system consists of Understanding Operating Systems • Memory manager • Processor manager • Device manager • File manager 4

Subsystems Must Work With Each Other 5

Subsystems Must Work With Each Other 5

Tasks Performed by Each Subsystem • Monitor its resources continuously • Enforce the policies

Tasks Performed by Each Subsystem • Monitor its resources continuously • Enforce the policies that determine who gets what, when and how much • Allocate the resource when appropriate • Deallocate the resource (reclaim it) when appropriate Understanding Operating Systems 6

Machine Hardware • Memory chips • Input/output devices (monitor, keyboard, printer) • Storage devices

Machine Hardware • Memory chips • Input/output devices (monitor, keyboard, printer) • Storage devices (disks, magnetic tape, card readers, drums) • Central Processing Unit (Arithmetic Logic Unit, registers, internal control, bus control) Understanding Operating Systems 7

Types of Operating Systems • • • Batch (simple and multi-programmed) Interactive (time-sharing) Real-time

Types of Operating Systems • • • Batch (simple and multi-programmed) Interactive (time-sharing) Real-time systems Hybrid systems (combination of batch and interactive) Parallel (tightly coupled) Distributed (loosely coupled) Understanding Operating Systems 8

Brief History of Operating Systems Development Second Generation Job scheduling, JCL, faster I/O, spooling,

Brief History of Operating Systems Development Second Generation Job scheduling, JCL, faster I/O, spooling, batch, files 1940 1955 Recent Developments Distributed computing, personal computers, highspeed communication, multi-media 1965 1980 First Generation Third Generation Vacuum tube, single user, early operating systems Shared processing, multiprogramming, virtual memory, DBMS Understanding Operating Systems 1990 9

Key Terms • • • batch system central processing unit device manager file manager

Key Terms • • • batch system central processing unit device manager file manager firmware hardware hybrid system interactive system main memory mainframe Understanding Operating Systems • • • memory manager microcomputer minicomputer multiprocessing networking operating system processor manager real-time system software supercomputer workstation 10