A method and apparatus to reduce bus usage and to increase resource locking protocol compatibility within a heterogeneous processing environment. Lock indicators are maintained in stores designated as lock registers and access to a resource is gained by any processor depending upon the status of a lock...http://www.google.de/patents/US5669002?utm_source=gb-gplus-sharePatent US5669002 - Multi-processor resource locking mechanism with a lock register corresponding to each resource stored in common memory
