GATE | GATE CS 2021 | Set 2 | Question 52

Consider the following multi-threaded code segment (in a mix of C and pseudo-code), invoked by two processes P1 and P2, and each of the processes spawns two threads T1 and T2:

int x = 0;  // global
Lock L1;    // global
main () { 
    create a thread to execute foo( ); // Thread T1
    create a thread to execute foo( ); // Thread T2
    wait for the two threads to finish execution;
    print(x);}
    
    
foo() {
    int y = 0;
    Acquire L1;
    x = x + 1;
    y = y + 1;
    Release L1;
    print (y);}

Which of the following statement(s) is/are correct?

(A)

Both P1 and P2 will print the value of x as 2.

(B)

At least of P1 and P2 will print the value of x as 4.

(C)

At least one of the threads will print the value of y as 2.

(D)

Both T1 and T2, in both the processes, will print the value of y as 1.

Answer

Please comment below if you find anything wrong in the above post
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