Applicant processes to be performed on several processors in a data processing system are synchronized and allocated. The data processing system includes plural processors, each of which derives a control signal indicating that an event has occurred which requires a change in the status of the system,...http://www.google.com.hk/patents/US4590555?utm_source=gb-gplus-share專利 US4590555 - Apparatus for synchronizing and allocating processes among several processors of a data processing system