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B.E/B.TechDEGREE EXAMINATION APRIL/MAY 2008

Fourth semester

Computer science and Engineering

CS1252-operating system

(Regulation 2004)

Time: 3 hours                                                                                              Maximum marks: 100


Answer ALL questions

PART A (10 x 2 =20 marks)

1. Specify the critical factor to be strictly followed in real_time systems.

2.List out the three main advantage of multiprocessor system

3.What is co_operating process?

4.What is bounded waiting in critical section?

5. What are the four necessary conditions a system should possess in order to be termed as deadlock?

6. What is Segmentation?

7. Why should we use virtual memory?

8.What is meant by thrashing?

9.Name the entries that makes up a file control block(FCB).

10. State any two distinguishing features of UNIX and Windows.

PART B (5 x 16 = 80)

11(a) (i). Explain the facilities provided by the following operating systems(10)

(ii)List out the services provided by the operating system to programs and to the user of program. (6).

(b)(i)Explain the process creation and process termination process on process. (8)

(ii)Write short notes on co-operating processes and schedulers. (8)

12 (a) Describe the following scheduling algorithms (16)
(i) Shortest-job-first scheduling
(ii) Round-robin scheduling
(iii) Real-time scheduling
(iv) Priority scheduling

(b)What is the important feature of critical section? State the dining philosopher’s problem and show how to allocate the several resoures among several processes in a deadlock and starvation free manner. (16)

13(a) (i) How can deadlock be detacted? Ex-plain (10)

(ii)Write short notes on Swapping (6)

(b)Discuss the advantages of paging memory management and the conversion of logical address into physical address with necessary hardware (16)

14(a) Discuss the following page replacement algorithms, giving a suitable page references string (5+5+6)

(i) LRU

(ii) FIFO

(iii) Optimal
(or)
(b)(i)State the various attributes of a file and their purpose.Discuss the various file operations. (10)

(ii)Discuss about demand paging (6)

15(a) Describe in detail any three methods of implementing the file system. (16)
(or)
(b)Write short notes on:
(i)Disk structure (6)
(ii)Indexed allocation (5)
(iii)Shortest-seek-Time-First (SSFT) scheduling. (5)


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