GATE | Gate IT 2007 | Question 10

Processes P₁ and P₂ use critical_flag in the following routine to achieve mutual exclusion. Assume that critical_flag is initialized to FALSE in the main program.


 get_exclusive_access ( )
{
    if (critical _flag == FALSE) {
        critical_flag = TRUE ;
        critical_region () ;
        critical_flag = FALSE;
    }
}

Consider the following statements.
i. It is possible for both P₁ and P₂ to access critical_region concurrently.
ii. This may lead to a deadlock.
Which of the following holds?

(A)

(i) is false and (ii) is true

(B)

Both (i) and (ii) are false

(C)

(i) is true and (ii) is false

(D)

Both (i) and (ii) are true

Answer

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