When a special machine instruction is used to provide mutual exclusion in the fashion of Figure 5.2, there is no control over how long a process must wait before being granted access to its critical section. Devise an algorithm that uses the compare & swap instruction but that guarantees that any process waiting to enter its critical section will do so within n −1 turns, where n is the number of processes that may require access to the critical section and a “turn” is an event consisting of one process leaving the critical section and another process being granted access.