ch1 - Chapter 1: Introduction Chapter Chapter 1:...

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Chapter 1: Introduction Chapter 1: Introduction
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1.2 Silberschatz, Galvin and Gagne ©2005 th 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 th 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 th 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 th Operating System Operating System Manages the computer hardware Varies from machine type to machine type. Efficiency versus convenience
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1.6 Silberschatz, Galvin and Gagne ©2005 th 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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1.7 Silberschatz, Galvin and Gagne ©2005 th Four Components of a Computer System Four Components of a Computer System
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1.8 Silberschatz, Galvin and Gagne ©2005 th OS from two viewpoints OS from two viewpoints User View (Ease of use, performance, resource utilization) PC Mainframe/Minicomputer terminals Networks of Workstations and Servers Handheld computers System View OS as a resource allocator OS as a control program
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1.9 Silberschatz, Galvin and Gagne ©2005 th Operating System Definition Operating System Definition OS is a resource allocator Manages all resources (CPU time, memory space, file space. ..) 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. It is especially concerned with the operation and control of I/O devices.
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1.10 Silberschatz, Galvin and Gagne ©2005 th Operating System Definition (Cont.) Operating System Definition (Cont.) No universally accepted definition The fundamental goal of computer systems is to execute user programs and make solving user problems easier. For this,
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ch1 - Chapter 1: Introduction Chapter Chapter 1:...

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