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hw5sol-partial - HOMEWORK 5 SOLUTION(Version 1 Total Points...

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HOMEWORK 5 SOLUTION ------------------- Oct 30, 2008 (Version 1) Total Points = 14 = 2 + 6 + 6 Problem 1 (2 Points) --------- (TO COME) Problem 2 (0 Points) --------- a) The test 'turn == other' places a FIFO ordering on entry into the critical section. Without loss in generality, suppose process 0 is in the critical section while process 1 is busy waiting. If process 0 leaves the critical section, it does so by turning off flag[0]. If process 0 attempts to reenter the critical section before process 1 gets to evaluate the conditional of the while statement, it will have set turn equal to other and busy wait. Meanwhile, as soon as process 1 evaluates the conditional part of the while, it will enter the critical section because process 0's execution of the 'turn = other' statement will release process 1. Thus, one process can not monopolize the critical section; i.e., it can not get ahead of the other process if it is also trying to enter the critical section. b) Since there is no mutual waiting from the explanation in Part a, there can not be any deadlock.
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