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2003 Course Real Time Operating Systems (Elective II)

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Total No. of Questions : 12] [Total No. of Pages : 3 [3864] - 253 P 1276 B.E. (Electronics) REAL TIME OPERATING SYSTEMS (2003 Course) (Elective - II) (404212) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answers to the two sections should be written in separate answer books. 2) In Section-I attempt Q.1 or Q.2, Q.3 or Q.4 and Q.5 or Q.6 in Section-II attempt Q.7 or Q.8, Q.9 or Q.10 and Q.11 or Q.12. 3) Neat diagrams, flow charts must be drawn and well commented pseudo code written wherever necessary. 4) Figures to the right indicate full marks. 5) Assume suitable data, if necessary. SECTION - I Q1) a) b) Discuss the memory requirements in foreground / background and multi tasking system. [8] Explain clock tick in multitasking system. What are the constraints in selection of the clock tick in multitasking system? How accurate time this can give? [8] OR Q2) a) b) Q3) a) b) What is RMS theorem? How it is useful in assigning tasks priorities? Check whether the following set of periodic real-time tasks is schedulable under RMS on a uniprocessor system : T 1 = (e1 = 20, p1 = 100), T2 = (e2 = 30, p2 = 150), T3 = (e3 = 60, p3 = 200). [8] Discuss interrupt and interrupt timings for foreground / background, nonpreemptive and preemptive kernel. [8] Explain, Locking and unlocking of scheduler in uCOSII, Nesting of scheduler lock, Possible situation and precautions while using scheduler lock/unlock. [8] What is the use of following members of OS_TCB? And how they are manipulated? [8] INT8U OSTCBX; INT8U OSTCBY; INT8U OSTCBitX; INT8U OSTCBitY; OR P.T.O.

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