OS_ch01_F07 - I-C Lin Assistant Professor Textbook...

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I.-C. Lin, Assistant Professor. Textbook: Operating System Principles 7ed
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Chapter 1: Introduction hat Operating Systems Do y What Operating Systems Do y Computer System Organization y omputer ystem Architecture Computer System Architecture y Operating System Structure y Operating System Operations pg y p y Process Management y Memory Management y Storage Management y Protection and Security y Distributed Systems y Special Purpose Systems y Computing Environments
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Objectives o provide a grand tour of the major operating systems y To provide a grand tour of the major operating systems components y To provide coverage of basic computer system rganization organization
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Computer System Structure omputer system can be divided into four y Computer system can be divided into four components sers y Users y People, machines, other computers y Application programs define the ways in which the system resources are used to solve the computing problems of the users y Word processors, compilers, web browsers, database systems, video games
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Computer System Structure (cont.) y Operating system ontrols and coordinates use of hardware among various y Controls and coordinates use of hardware among various applications and users y Hardware provides basic computing resources y CPU, memory, I/O devices
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Four Components of a Computer System
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What is an Operating System? program that acts as an intermediary between a y A program that acts as an intermediary between a user of a computer and the computer hardware. y Operating system goals: y Execute user programs and make solving user problems easier. k th t t it t y Make the computer system convenient to use. y Use the computer hardware in an efficient manner.
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Operating System Definition S is a source allocator y OS is a resource allocator y Manages all resources y Decides between conflicting requests for efficient and fair resource use y OS is a control program y Controls execution of programs to prevent errors and improper use of the computer
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Operating System Definition (Cont.) o universally accepted definition y No universally accepted definition e rth ing a endor ships hen ou order an operating y Everything a vendor ships when you order an operating system is good approximation y ut varies wildly But varies wildly y 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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Computer Startup ootstrap program loaded at power p or reboot y bootstrap program is loaded at power up or reboot y Typically stored in ROM or EEPROM, generally known s rmware as firmware itializates all aspects of system y Initializates all aspects of system oads operating system kernel and starts execution y Loads operating system kernel and starts execution
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Computer System Organization omputer stem operation y Computer system operation y One or more CPUs, device controllers connect through
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OS_ch01_F07 - I-C Lin Assistant Professor Textbook...

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