Midterm-2010

Midterm-2010 - Advanced Operating Systems Theory CSci 8101...

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Advanced Operating Systems Theory CSci 8101 (Spring 2010) Midterm Exam (Take Home) Due Date Friday March 12 (Morning 11:00 AM) Please submit your answers online in PDF format only . This exam must be answered individually without consulting anyone. (Late submission: Deduction of 5 points for every 1 hour late submission.) Please write short and succinct answers for each of the following questions. Problem 1 (15 points): In the Schiper-Eggli-Sandoz protocol for causal communication, each process maintains a vector C of entries of the form (P j , T j ). What is the significance of an entry in this vector? When can an entry in this vector be deleted safely by a process? Clearly present the rule for deleting an entry from this vector. Problem 2 (10 points): In the mutual exclusion protocol by Maekawa, do the processes always enter critical section (i.e. acquire lock) in strictly the increasing order of the timestamp values of their requests? Is it possible for a process with a higher timestamp request to enter critical section before a process with a lower timestamp
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Midterm-2010 - Advanced Operating Systems Theory CSci 8101...

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