gate IT 2007 closed

Question

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 tru

Comments

ans is option c, statement 1 is true and statement 2 is false

this is similar to LOCK variable in Synchronizing Mechanisms