1
GATE CSE 2020
MCQ (Single Correct Answer)
+2
-0.67
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 GATE CSE 2020 Operating Systems - Synchronization and Concurrency Question 2 English
What does the code achieve?
A
It ensures that all processes execute CODE SECTION P mutually exclusively.
B
It ensures that at most two processes are in CODE SECTION Q at any time.
C
It ensures that no process executes CODE SECTION Q before every process has finished CODE SECTION P.
D
It ensures that at most n-1 processes are in CODE SECTION P at any time.
2
GATE CSE 2013
MCQ (Single Correct Answer)
+2
-0.6
A shared variable x, initialized to zero, is operated on by four concurrent processes W, X, Y, Z as follows. Each of the processes W and X reads x from memory, increments by one, stores it to memory, and then terminates. Each of the processes Y and Z reads x from memory, decrements by two, stores it to memory, and then terminates. Each process before reading x invokes the P operation (i.e., wait) on a counting semaphore S and invokes the V operation (i.e., signal) on the semaphore S after storing x to memory. Semaphore S is initialized to two. What is the maximum possible value of x after all processes complete execution?
A
-2
B
-1
C
1
D
2
3
GATE CSE 2013
MCQ (Single Correct Answer)
+2
-0.6
A certain computation generates two arrays a and b such that a[i]=f(i)for 0 ≤ i < n and b[i] = g (a[i] )for 0 ≤ i < n. Suppose this computation is decomposed into two concurrent processes X and Y such that X computes the array a and Y computes the array b. The processes employ two binary semaphores R and S, both initialized to zero. The array a is shared by the two processes. The structures of the processes are shown below.
Process X:
private i;
for(i = 0; i < n; i++){
 a [i] = f (i);
 Exit X (R, S);
}

Process Y:
private i;
for(i = 0; i < n; i++){
 Entry Y (R, S);
 b [i] = g (a [i] );
}
Which of the following represents the correct implementations of Exit X and Entry Y?
A
Exit X (R, S){
  P(R);
  V(S);
}
Entry Y (R, S){
  P(S);
  V(R);
}
B
Exit X (R, S){
  V(R);
  V(S);
}
Entry Y (R, S){
  P(R);
  P(S);
}
C
Exit X (R, S){
  P(S);
  V(R);
}
Entry Y (R, S){
  V(S);
  P(R);
}
D
Exit X (R, S){
  V(R);
  P(S);
}
Entry Y (R, S){
  V(S);
  P(R);
}
4
GATE CSE 2012
MCQ (Single Correct Answer)
+2
-0.6
Fetch_And_Add (X, i) is an atomic Read-Modify-Write instruction that reads the value of memory location X, increments it by the value i, and returns the old value of X. It is used in the pseudocode shown below to implement a busy-wait lock. L is an unsigned integer shared variable initialized to 0. The value of 0 corresponds to lock being available, while any non-zero value corresponds to the lock being not available.
AcquireLock(L){ 
  While (Fetch_And_Add(L,1)) 
  L = 1; 
} 
Release Lock(L){ 
  L = 0; 
}
This implementation
A
fails as L can overflow
B
fails as L can take on a non-zero value when the lock is actually available
C
works correctly but may starve some processes
D
works correctly without starvation
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