The Management of Critical Resource in UNIX System on Multiprocessors With Shared Memory

With the development of UNIX from running on single processor to multiprocessors with shared memory,the management of critical resource becomes the focus,and the use of semaphore is the major and effective method to manage the exclusive use of critical resource.This paper descri- bes the definition of semaphore,its type and algorithm which may be used in UNIX kernel running on multiprocessors with shared memory and its use in CONVEX UNIX.