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GATE CS 2021 : Operating System Quiz 5
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Question 1
Consider the following two-process synchronization solution
Process 0
---------
Entry: loop while (turn == 1); (critical section)
Exit: turn = 1;
Process 1
-----------
Entry: loop while (turn == 0); (critical section)
Exit: turn = 0;
The shared variable turn is initialized to zero. Which one of the following is TRUE?
Process 0
---------
Entry: loop while (turn == 1); (critical section)
Exit: turn = 1;
Process 1
-----------
Entry: loop while (turn == 0); (critical section)
Exit: turn = 0;
The shared variable turn is initialized to zero. Which one of the following is TRUE?
Question 2
The following two functions P1 and P2 that share a variable B with an initial value of 2 execute concurrently.
P1()
{
C = B – 1;
B = 2*C;
}
P2()
{
D = 2 * B;
B = D - 1;
}
The number of distinct values that B can possibly take after the execution is ___________.
P1()
{
C = B – 1;
B = 2*C;
}
P2()
{
D = 2 * B;
B = D - 1;
}
The number of distinct values that B can possibly take after the execution is ___________.
Question 3
Consider the following statements about Consumer-Producer problem. Which one of the following statement is True?
Question 4
Test & Set Lock is not free from ?
Question 5
Strict alteration approach or turn variable approach will ensure
Question 6
Which of the following implementation may waste CPU cycle.
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