ch1 - Chapter 1 Introduction Chapter 1 Introduction s What...

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Chapter 1: Introduction Chapter 1: Introduction
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1.2 Silberschatz, Galvin and Gagne  © 2005 Operating System Concepts – 7 th  Edition, Jan 12, 2005 Chapter 1: Introduction 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
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1.3 Silberschatz, Galvin and Gagne  © 2005 Operating System Concepts – 7 th  Edition, Jan 12, 2005 Objectives 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  © 2005 Operating System Concepts – 7 th  Edition, Jan 12, 2005 What is an Operating System? 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  © 2005 Operating System Concepts – 7 th  Edition, Jan 12, 2005 Computer System Structure 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  © 2005 Operating System Concepts – 7 th  Edition, Jan 12, 2005 Four Components of a Computer System Four Components of a Computer System
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1.7 Silberschatz, Galvin and Gagne  © 2005 Operating System Concepts – 7 th  Edition, Jan 12, 2005 Operating System Definition 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  © 2005 Operating System Concepts – 7 th  Edition, Jan 12, 2005 Operating System Definition (Cont.) Operating System Definition (Cont.) No universally accepted definition “Everything a vendor ships when you order an operating system” 
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