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BN104-Operating Systems

tag 0 Download 5 Pages / 1,074 Words tag 15-11-2020


1.a.On a hard disk, the queue of track requests is as follows:
Assume that the head starts at track 20.
Draw a diagram for arm movement for each of the following seek strategies. 
ii) SSTF
iii) LOOK
b.Calculate the total number of tracks and the average number of tracks travelled by the head to satisfy the requests in B-Q1-a 
2.a.What is a race condition? Explain race condition with an example (do not use the example from the lecture slide). Use your own example and explain in your own words.
b.Consider a system with four dedicated resources and four processes (process P1, P2, P3 and P4) that require a maximum of two devices to complete a task. Draw a directed graph of the scenario that demonstrates there is a deadlock in the system. Explain your graph with details.
c.I. Files can be formatted with fixed-length or variable-length fields. Explain them in your own words with example
II. Explain relative and complete file name in your own words with example
3.a.Document the following UNIX commands
• grep
• chmod
• wc
• ls
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