operating system ch 2 – Flashcards
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What is the purpose of system calls?
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System calls allow user-level processes to request services of the operating system.
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What are the five major activities of an operating system with regard to process management?
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a. The creation and deletion of both user and system processes b. The suspension and resumption of processes c. The provision of mechanisms for process synchronization d. The provision of mechanisms for process communication e. The provision of mechanisms for deadlock handling
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What are the three major activities of an operating system with regard to memory management?
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a. Keep track of which parts of memory are currently being used and by whom. b. Decide which processes are to be loaded into memory when memory space becomes available. c. Allocate and deallocate memory space as needed.
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What are the three major activities of an operating system with regard to secondary-storage management?
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• Free-space management. • Storage allocation. • Disk scheduling.
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system calls
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programming interface to the services provided by the OS
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types of system calls
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-process control : create process,load execute -file management :create / delete file -device management : delete device -information maintenance : get time/date ,set time/date -communications : create delete connection
