Arrays
December 19, 2023Question 16776 – Data-Structures
December 19, 2023Operating-Systems
| Question 18 |
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?
| At least one of P1 and P2 will print the value of x as 4. | |
| Both T1 and t2, in both the processes, will print the value of y as 1. | |
| Both P1 and P2 will print the value of x as2. | |
| At least one of the threads will print the value of y as 2. |
- True,
Execution order : P1->T1->T2; P2->T1->T2; P1-print(x),P2-print(x) | output is 4,4
- True,
y=y+1 can be treated as a critical section, and it is well synchronized by Acquire L1 and release L1.
- False, need not be true always.
- False,
Threads maintain their own copy of stack,and local variables (y) are stored on the stack.
- True,
Execution order : P1->T1->T2; P2->T1->T2; P1-print(x),P2-print(x) | output is 4,4
- True,
y=y+1 can be treated as a critical section, and it is well synchronized by Acquire L1 and release L1.
- False, need not be true always.
- False,
Threads maintain their own copy of stack,and local variables (y) are stored on the stack.