((Solve for B)) *****

1. TestandSet0 is an atomic operation as follows: boolean TestandSet (boolean target) { boolean prev = *target; *target = true; return prev; // always set true /7 return previous value TestandSetO can be applied to achieve mutual exclusion as follows: do while (TestandSet (&lock)) loop and wait // critical section lock = false ; // remainder sectiorn (a) Indicate the entry section and exit section in the above code (b) Assume there are two processes Pl and P2 executing the above code and Pl starts slightly ahead of P2. Assume lock is initilized as false. Give a trace of excution of P1 and P2, according to the following table. Time running process state(section) lock Return ValueOfTestandSet TO false n/a