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Worksheet Question: Does this code segment solve the critical section problem proc (int i) { while...

Worksheet Question: Does this code segment solve the critical section problem
proc (int i) {
while (true) {
compute;
while (flag [(i + 1) mod 2 ]);
flag [i] = TRUE;
CRITICAL SECTION
flag [i] = FALSE;
}
}
Shared Boolean flag[2]
flag [0] = flag[ 1] = FALSE;
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Homework Answers

Answer #1

No this cannot solve the critical section problem for the following reason.

If one process does "while(flag[(i+1)mod2])", gets interrupted immediately afterward, then the other process does the same thing, then they both go on to do “flag[i]=TRUE” and enter their critical sections at the same time, violating Mutual Exclusion

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