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GATE | GATE-CS-2001 | Question 47
Consider Peterson’s algorithm for mutual exclusion between two concurrent processes i and j. The program executed by process is shown below.
repeat
flag [i] = true;
turn = j;
while ( P ) do no-op;
Enter critical section, perform actions, then exit critical
section
flag [ i ] = false;
Perform other non-critical section actions.
until false;
For the program to guarantee mutual exclusion, the predicate P in the while loop should be.
(A)
flag[j] = true and turn = i
(B)
flag[j] = true and turn = j
(C)
flag[i] = true and turn = j
(D)
flag[i] = true and turn = i
Answer
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