Each of processors in a multiprocessor system has a circuit for sending a synchronizing signal to a storage controller (SC) connected thereto when executing a synchronization instruction such as a start, end or barrier synchronization instruction. Each of the SCs has a circuit for notifying the corresponding...http://www.google.co.uk/patents/US6263406?utm_source=gb-gplus-sharePatent US6263406 - Parallel processor synchronization and coherency control method and system
