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2003 Course Real Time Operating Systems (Elective II)

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Total No. of Questions : 12] P1314 [Total No. of Pages : 3 [3664]-223 B.E. (Electronics) REAL TIME OPERATING SYSTEMS (2003 Course) (404212) (Elective - II) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answers to 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 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) What is context switching? Give suitable example. b) How priorities are assigned to the task in multitasking system? [6] [5] c) Explain how interrupts are responding in systems. Define interrupt latency interrupt response and interrupt recovery. [6] OR Q2) a) What is critical section? Give suitable example. [6] b) Compare preemptive and non preemptive Kernel. Explore the application of both. [5] c) What is dead lock? Give suitable example. [6] Q3) a) What are the data structures and variables used to handle priority of task for scheduling? [6] b) What is statistic task? How it is initialized. [5] c) What is event in uCOSII. Explain ECB data structure? [6] OR Q4) a) Draw and explain state diagram of task. Show various conditions for transitions. [6] b) Explain and describe TCB data structure in uCOSII. [6] c) How to set and query on system time? [5] P.T.O. Q5) a) Enlist different MUTEX services. What configuration constants provided to configure MUTEX? [5] b) Explain Event Flag Group data structure OS _ FLAG _ GRP and OS _ FLAG _ NODE. [6] c) What is relationship between Task, Mutex and ISR in uCOSII? [5] OR Q6) a) What is relationship between Task, ISR and Semaphore in uCOSII?[6] b) Write short note on any two : [10] i) Semaphore management in uCOSII. ii) Mutual exclusion semaphore in uCOSII. iii) Event flag management in uCOSII. SECTION - II Q7) a) How to use Mailox as binary semaphore. Explain by using pseudo code. [6] b) What is relationship between Task, ISR and Message Queue in uCOSII. [5] c) What are Message Queue services in uCOSII? How Message Queue services enabled/disabled in uCOSII. [6] OR Q8) a) What is relationship between tasks, ISR and Mailbox in uCOSII? [5] b) How to use Message Queue as counting semaphore, use pseudo code?[6] c) Explain Mailbox services and configuration in uCOSII. Q9) a) Explain uCOSII hardware and software architecture. [6] [6] b) Explain memory control block in uCOSII. [6] c) Explain the system requirements for porting of uCOSII. [5] OR Q10) a) What is the need of memory management services by OS as compare to compiler function? [6] b) Explain memory management services provided in uCOSII. [5] c) What is memory partition and multiple memory partition, explain. [6] [3664]-223 2 Q11) Assume appropriate data wherever necessary and consider the design and implementation of Temperature Controller by using uCOSII. a) Enlist the performance parameters. [4] b) State the constraints and assign priorities to the defined tasks. [4] c) Enlist the API required to be used for implementation. [4] d) Write application code for the above system. [4] OR Q12) Assume appropriate data wherever necessary and consider the design and implementation of Chocolate Vending Machine by using uCOSII. a) Enlist the performance parameters. [4] b) State the constraints and assign priorities to the defined tasks. [4] c) Enlist the API required to be used for implementation. [4] d) Write application code for the above system. [4] xxxx [3664]-223 3

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