ch1 - Chapter 1: Introduction Operating System Concepts 8th...

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Silberschatz, Galvin and Gagne ©2009 Operating System Concepts – 8 th Edition, Chapter 1: Introduction
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1.2 Silberschatz, Galvin and Gagne ©2009 Operating System Concepts – 8 th Edition Chapter 1: Introduction What Operating Systems Do Computer-System Organization Computer-System Architecture Operating-System Structure Operating-System Operations Process Management Memory Management Storage Management Protection and Security Distributed Systems Special-Purpose Systems Computing Environments Open-Source Operating Systems
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1.3 Silberschatz, Galvin and Gagne ©2009 Operating System Concepts – 8 th Edition Objectives To provide a grand tour of the major operating systems components To provide coverage of basic computer system organization
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1.4 Silberschatz, Galvin and Gagne ©2009 Operating System Concepts – 8 th Edition What is an Operating System? A program that acts as an intermediary between a user of a computer and the computer hardware Operating system goals: Execute user programs and make solving user problems easier Make the computer system convenient to use Use the computer hardware in an efficient manner
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1.5 Silberschatz, Galvin and Gagne ©2009 Operating System Concepts – 8 th Edition Computer System Structure Computer system can be divided into four components Hardware – provides basic computing resources CPU, memory, I/O devices Operating system Controls and coordinates use of hardware among various applications and users Application programs – define the ways in which the system resources are used to solve the computing problems of the users Word processors, compilers, web browsers, database systems, video games Users People, machines, other computers
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1.6 Silberschatz, Galvin and Gagne ©2009 Operating System Concepts – 8 th Edition Four Components of a Computer System
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1.7 Silberschatz, Galvin and Gagne ©2009 Operating System Concepts – 8 th Edition Operating System Definition OS is a resource allocator Manages all resources Decides between conflicting requests for efficient and fair resource use OS is a control program Controls execution of programs to prevent errors and improper use of the computer
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1.8 Silberschatz, Galvin and Gagne ©2009 Operating System Concepts – 8 th Edition Operating System Definition (Cont) No universally accepted definition “Everything a vendor ships when you order an operating system” is good approximation But varies wildly “The one program running at all times on the computer” is the kernel . Everything else is either a system program (ships with the operating system) or an application program
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1.9 Silberschatz, Galvin and Gagne ©2009 Operating System Concepts – 8 th Edition Computer Startup bootstrap program is loaded at power-up or reboot Typically stored in ROM or EPROM, generally known as firmware Initializes all aspects of system Loads operating system kernel and starts execution
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1.10
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This note was uploaded on 03/04/2012 for the course ENG OS taught by Professor Ta during the Fall '08 term at Virginia Tech.

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ch1 - Chapter 1: Introduction Operating System Concepts 8th...

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