GATE 2020 | OS | SEMAPHORE | CODE SECTION | SOLUTIONS ADDA | GATE TEST SERIES | EXPLAINED BY VIVEK

Описание: GATE 2020 Q54: Each of a set of n processes executes the following code using two semaphores a and b initialized to 1 and 0, respectively. Assume that count is a shared variable initialized to 0 and not used in CODE SECTION P.
wait (a); count = count+1;
if (count==n) signal (b);
signal (a); wait (b); signal (b);
What does the code achieve?

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