Semaphores 1 MCQs

13 MCQs  — Operating System MCQs  (Page 2 of 2)

Attempt Semaphores 1 Quiz
The following program consists of 3 concurrent processes and 3 binary semaphores. The semaphores are initialized as S0 = 1, S1 = 0, S2 = 0. Process P0 while(true) { wait(S0); print '0'; release(S1); release(S2); } Process P1 wait(S1); release(S0); Process P2 wait(S2); release(S0); How many times will P0 print ‘0’?
A. At least twice
B. Exactly twice
C. Exactly thrice
D. Exactly once
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Each process Pi, i = 0,1,2,3,……,9 is coded as follows. repeat P(mutex) {Critical Section} V(mutex) forever The code for P10 is identical except that it uses V(mutex) instead of P(mutex). What is the largest number of processes that can be inside the critical section at any moment (the mutex being initialized to 1)?
A. 1
B. 2
C. 3
D. None of the mentioned
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Two processes, P1 and P2, need to access a critical section of code. Consider the following synchronization construct used by the processes. Process P1 : while(true) { w1 = true; while(w2 == true); Critical section w1 = false; } Remainder Section Process P2 : while(true) { w2 = true; while(w1 == true); Critical section w2 = false; } Remainder Section Here, w1 and w2 have shared variables, which are initialized to false. Which one of the following statements is TRUE about the above construct?
A. It does not ensure mutual exclusion
B. It does not ensure bounded waiting
C. It requires that processes enter the critical section in strict alternation
D. It does not prevent deadlocks but ensures mutual exclusion
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Word of the Day
27 Aug
Grievous
(of something bad) very severe or serious.
خطرناک ، تشویشناک، سنگین

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