A computer system comprises a system memory, a first active device configured to access data stored in the system memory, and a second active device configured to access data stored in said system memory. The first active device is configured to generate a read-to-share transaction corresponding to a...http://www.google.com/patents/US7165149?utm_source=gb-gplus-sharePatent US7165149 - Mechanism for starvation avoidance while maintaining cache consistency in computer systems
