GATE CSE · 2026 · CS2
Question 51: Operating System
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Question 51
CS2MSQ2 marksNeeds review
Consider three processes P1, P2, and P3 running identical code, as shown in the pseudocode below. A and B are two binary semaphores initialized to 1 and 0, respectively. X is a shared variable initialized to 0. Each line in the pseudocode is executed atomically.
Pseudocode of P1, P2, and P3
Wait(A);
Print(*);
X = X+1;
If (X == 2)
{
Print($);
Signal(B);
}
Signal(A);
Wait(B);
Print(#);
Signal(B);
Assume that any of the three processes can start to execute first and context switching can happen between these processes at any arbitrary time and in any arbitrary order.
Which of the following patterns is/are possible to be generated as an outcome of the execution of these three processes?
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2026CS2
GATE CSE 2026 · Paper 2
Computer Science and Information Technology · Original paper archive
- Section
- Section CS2
- Question type
- Multiple select (MSQ)
- Marks
- 2 marks
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