Fetch And Add (FAA), atomically increments a variable and returns the old value of the variable. FAA (var, increment) adds increment to the variable…

1.Fetch And Add (FAA), atomically increments a variable and returns the old value of the variable. FAA (var, increment) adds increment to the variable var and returns the initial value of var. We plan to use this for mutual exclusion. (10pts) 

shared int