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Posted By: kondapalli Member Level: Gold Posted Date: 05 May 2008
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2007 Jawaharlal Nehru Technological University B.Tech Electronics & Communications Engineering OPERATING SYSTEMS Question paper
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1. Describe the Objectives and functions of Operating system. Also explain the dif-
ferent services provided by the operating system. [5+5+6]
2. Discuss about the following:
(a) user-level threads
(b) Kernel-level threads
(c) Multi-threadings. [5+5+6]
3. Show that monitors and semaphores have equivalent functionality by
(a) Implementing a monitor using semaphores
(b) Implementing a semaphore using monitors [8+8]
4. What is dining philosophers problem? Device an algorithm to solve the problem
using Semaphore. [4+12]
5. (a) Discuss the differences between a pure paging and pure segmentation virtual
memory systems. What are the pros and cons of each scheme?
(b) What are the three main issues of implementing a virtual memory system?
(c) Comment on the relative merits of using a local versus a global page replace-
ment policy. [6+5+5]
6. (a) What are preemptive and non-preemptive scheduling policies?
(b) Describe non-preemptive scheduling policies [8+8]
7. (a) What do you understand by a file directory?
(b) Explain briefly the information elements of a file directory
(c) Explain what is tree-structured directory? [5+5+6]
8. What do you understand by Trusted systems? Draw a figure of reference monitor
concept and explain. [5+5+6]
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