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2003 Course Operating Systems

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Total No. of Questions : 12] P1374 [Total No. of Pages : 2 [3764]-412 B.E. (Computer Engg.) OPERATING SYSTEMS (410442) (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answers to the two sections should be written in separate books. 2) Neat diagrams must be drawn wherever necessary. 3) Figures to the right indicate full marks. 4) Assume suitable data, if necessary. SECTION - I Q1) a) Explain in brief different types of semaphores. Discuss Reader / Writer problem using semaphore. [10] b) Discuss the Hardware approach to achieve mutual exclusion. [6] OR Explain the structure of monitor. Discuss Producer / Consumer problem using monitor. [10] Q2) a) b) Q3) a) b) Q4) a) b) Explain in brief the following terms: i) Busy waiting. ii) Critical Region. [6] Explain the following: [8] i) Necessary conditions for deadlock. ii) Methods of deadlock recovery. State and explain different methods for user authentication and security. [8] OR Explain Banker's algorithm with example. [8] Compare various access matrix schemes of implementation and revocation with respect to each other. [8] P.T.O. 1

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