GATE-2024-CS1(Forenoon)
October 25, 2024Context-Switching
| Question 3 |
Consider the following two threads T1 and T2 that update two shared variables a and b. Assume that initially a=b=1. Though context switching between threads can happen at any time, each statement of T1 or T2 is executed atomically without interruption.
T1
a=a+1
b=b+1
T2
b=2*b
a=2*a
Which one of the following options lists all the possible combinations of values of a and b after both T1 and T2 finish execution?
| (a = 4, b = 4); (a = 3, b = 3); (a = 4, b = 3) | |
| (a = 3, b = 4); (a = 4, b = 3); (a = 3, b = 3) | |
| (a = 4, b = 4); (a = 4, b = 3); (a = 3, b = 4) | |
| (a = 2, b = 2); (a = 2, b = 3); (a = 3, b = 4) |
Correct Answer: A
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