ch1 - Chapter 1: Introduction Silberschatz, Galvin and...

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Silberschatz, Galvin and Gagne ©2009 (adopted and revised) Chapter 1: Introduction
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1.2 Silberschatz, Galvin and Gagne ©2009 (adopted and revised) Chapter 1: Introduction What Operating Systems Do Computer-System Architecture Operating-System Structure Operating-System Operations Process Management Memory Management Storage Management
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1.3 Silberschatz, Galvin and Gagne ©2009 (adopted and revised) 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 (adopted and revised) 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 (adopted and revised) 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 (adopted and revised) Four Components of a Computer System
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1.7 Silberschatz, Galvin and Gagne ©2009 (adopted and revised) 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 (adopted and revised) 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 (adopted and revised) 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 Silberschatz, Galvin and Gagne ©2009 (adopted and revised) Computer-System Operation I/O devices and the CPU can execute concurrently Each device controller is in charge of a particular device type Each device controller has a local buffer CPU moves data from/to main memory to/from local
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ch1 - Chapter 1: Introduction Silberschatz, Galvin and...

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