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2003 Course Operating Systems

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Total No. of Questions : 12] [Total No. of Pages : 3 [3664] - 335 P 1365 B.E. (Computer Engineering) OPERATING SYSTEMS (2003 Course) (410442) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer all questions from each section. 2) Answers to the two sections should be written in separate books. 3) Figures to the right indicate full marks. 4) Neat diagrams must be drawn wherever necessary. 5) Assume suitable data, if necessary. SECTION - I Q1) a) b) What is busy waiting with respect to process synchronization? Explain how semaphore reduces the severity of this problem. Also define with examples i) General semaphores. ii) Binary semaphores. iii) Strong semaphores. iv) Weak semaphores. [8] What is bounded buffer Producer/Consumer problem? Write a solution using monitors. [8] OR Q2) a) b) Jurassic Park consists of a dinosaur museum and a park for safari riding. There are m passengers and n single passenger cars. Passengers wander around the museum for a while, then line up to take a ride in a safari car. When a car is available, it loads the one passenger it can hold and rides around the park for a random amount of time. If the n cars are all riding passengers around, then a passenger who wants to ride waits; if a car is ready to load but there are no waiting passengers, then the car waits. Use semaphores to synchronize the m passenger processes and the n car processes. [8] What is basic requirement for execution of concurrent processes? Explain how concurrency is achieved in uniprocessor system. What is distinction between competing and cooperating processes? [8] P.T.O.

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