GATE - 2000 | OS | Let m[0]…m[4] be mutexes (binary semaphores) and P[0] …. P[4] be

Posted on 26-02-2022

GATE - 2000 [Operating System]

Questions:

Let m[0]…m[4] be mutexes (binary semaphores) and P[0] …. P[4] be processes.
Suppose each process P[i] executes the following:

wait (m[i]); wait(m[(i+1) mode 4]);

------

release (m[i]); release (m[(i+1)mod 4]);

This could cause:
(A) Thrashing
(B) Deadlock
(C) Starvation, but not deadlock
(D) None of the above

Solution:

Option (B) is Correct.

Let m[0]…m[4] be mutexes (binary semaphores) and P[0] …. P[4] be processes. Suppose each process P[i] executes the following: wait (m[i]); wait(m[(i+1) mode 4]); ------ release (m[i]); release (m[(i+1)mod 4]); This could cause: (A) Thrashing (B) Deadlock (C) Starvation, but not deadlock (D) None of the above

Thank You

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