Coherence

Whether to share memory or to share data contained in the file, when multiple process map a file simultaneously there may be problems with simultaneous access to data elements. Such processes can cooperate through any of the synchronization mechanisms provided in SunOS 5.0 through 5.7.0 through 5.. Because they are very light weight, the most efficient synchronization mechanisms in SunOS 5.0 through 5.7 are the threads library ones. See mutex(3T), condition(3T), rwlock(3T), and semaphore(3T) in the manual pages for details on their use.