5.3. 1 What is semaphore?(2/ 10) Synchronization a facility that enforces mutual exclusion and event ordering(必须按规定的先后顺序) Common synchronization mechanism Semaphore, Binary semaphore, Mutex, Condition variable, Monitor, Event flags, Messages Asynchronization??5.3.1 What is semaphore?(2/10) • Synchronization • A facility that enforces mutual exclusion and event ordering(必须按规定的先后顺序). • Common synchronization mechanism: • Semaphore, Binary semaphore, Mutex, Condition variable, Monitor, Event flags, Messages • Asynchronization?? 5