The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 15, 2010
Filed:
Jun. 22, 2007
Sanjay Vishin, Sunnyvale, CA (US);
Ryan C. Kinter, Seattle, WA (US);
Sanjay Vishin, Sunnyvale, CA (US);
Ryan C. Kinter, Seattle, WA (US);
MIPS Technologies, Inc., Sunnyvale, CA (US);
Abstract
Livelocks are prevented in multiple core processors by verifying that a data access request is still valid before sending messages to processor cores that may cause other data access requests to fail. A cache coherency manager receives data access requests from multiple processor cores. Upon receiving a data access request that may cause a livelock, the cache coherency manager first sends an intervention message back to the requesting processor core to confirm that this data access request will succeed. If the requesting processor core determines that the data access request is still valid, it directs the cache coherency manager to proceed with the data access request. The cache coherency manager may then send intervention messages to other processor cores to complete the data access request. If the requesting processor core determines that the data access request is invalid, it directs the cache coherency manager to abandon the data access request.