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◦ Resource allocator: decides between conflicting requests for efficient and fair resource use ◦ Control program: controls execution of programs to prevent errors and improper use of computer

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Study Guide to Accompany Operating Systems Concepts 8th Ed by Silberschatz, Galvin and GagneBy Andrew DeNicola, BU ECE Class of 2012Figures Copyright John Wiley & Sons 2012Ch.1 - IntroductionAn OS is a program that acts as an intermediary between a user of a computer and the computer hardwareGoals: Execute user programs, make the comp. system easy to use, utilize hardware efficientlyComputer system: Hardware OS Applications Users ( = 'uses')OS is:Resource allocator: decides between conflicting requests for efficient and fair resource useControl program: controls execution of programs to prevent errors and improper use of computerKernel: the one program running at all times on the computerBootstrap program: loaded at power-up or rebootStored in ROM or EPROM (known as firmware), Initializes all aspects of system, loads OS kernel and starts executionI/O and CPU can execute concurrentlyDevice controllers inform CPU that it is finished w/ operation by causing an interruptInterrupt transfers control to the interrupt service routine generally, through the interrupt vector, which contains the addresses of all the service routinesIncoming interrupts are disabled while another interrupt is being processedTrap is a software generated interrupt caused by error or user requestOS determines which type of interrupt has occurred by polling or the vectored interrupt systemSystem call: request to the operating system to allow user to wait for I/O comple

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