小 Mutual Exclusion(P193) B Critical resource: Only one process can access it at a time Critical section: the portion of the program that uses critical resource entry section critical secion exit section PROCESSES AND SCHEDULINGPROCESSES AND SCHEDULING Mutual Exclusion(P193) ❖ Critical resource: Only one process can access it at a time. ❖ Critical section：the portion of the program that uses critical resource. entry section critical section exit section