lecture1 - Chapter 1 Introduction Chapter 1 Introduction s...

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Chapter 1: Introduction Chapter 1: Introduction
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1.2 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 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 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 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 Four Components of a Computer System Four Components of a Computer System
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1.7 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 Operating System Definition (Cont.) 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 Computer Startup Computer Startup bootstrap program is loaded at power-up or reboot Typically stored in ROM or EPROM, generally known as firmware Initializates all aspects of system Loads operating system kernel and starts execution
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1.10 Computer System Organization Computer System Organization Computer-system operation One or more CPUs, device controllers connect through common bus providing access to shared memory Concurrent execution of CPUs and devices competing for memory cycles
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1.11 Computer-System Operation Computer-System Operation I/O devices and the CPU can execute concurrently. Each device controller is in charge of a particular device type.
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This note was uploaded on 01/20/2011 for the course CS 4560 taught by Professor Daley,j during the Spring '08 term at CSU East Bay.

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lecture1 - Chapter 1 Introduction Chapter 1 Introduction s...

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