Question

Below is an atomic instruction:

func (var) {

            var = var + 6;

            if(var >= 0) {

sign = 1;

}

            else {

sign = 0;

}

return sign;

}

Using func, implement Mutual Exclusion in a multiprocessing system. Also, give the initial value of var and

give the entire set of possible initial values for var. Aim to minimize bus traffic.

Answer 1

func (var) {

            var = var + 6;

            if(var >= 0) {

sign = 1;

}

            else {

sign = 0;

}

return sign;

}

var is 0 or 1.