What are Spinlocks?

• A. Cpu cycles wasting locks over critical sections of programs
• B. Locks that avoid time wastage in context switches
• C. Locks that work better on multiprocessor systems
• D. All of the mentioned

What is the main disadvantage of spinlocks?

• A. They are not sufficient for many process
• B. They require busy waiting
• C. They are unreliable sometimes
• D. They are too complex for programmers

The wait operation of the semaphore basically works on the basic _______ system call.

• A. Stop()
• B. Block()
• C. Hold()
• D. Wait()

The signal operation of the semaphore basically works on the basic _______ system call.

• A. Continue()
• B. Wakeup()
• C. Getup()
• D. Start()

If the semaphore value is negative ____________

• A. Its magnitude is the number of processes waiting on that semaphore
• B. It is invalid
• C. No operation can be further performed on it until the signal operation is performed on it
• D. None of the mentioned

The code that changes the value of the semaphore is ____________

• A. Remainder section code
• B. Non €? critical section code
• C. Critical section code
• D. None of the mentioned

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

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

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

What is the other name for distance vector routing algorithm?

• A. Ford and fullman algorithm
• B. Bellman €? ford algorithm
• C. Ford and fulkerson algorithm
• D. Bellman €? fulkerson algorithm