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:
May. 24, 2005
Filed:
Dec. 13, 2002
Chia Y. Wu, Newark, CA (US);
John D. Acton, Danville, CA (US);
Chia Y. Wu, Newark, CA (US);
John D. Acton, Danville, CA (US);
Sun Microsystems, Inc., Santa Clara, CA (US);
Abstract
Resources may be shared between multiple controllers configured to access those resources by associating a portion of a semaphore shared memory region with each different shared resource. Whenever a local write request to the portion of the semaphore shared memory region is detected by a memory controller, the memory controller may broadcast the write request to other remote memory controllers. The memory controller may delay performing a memory access to a local copy of that portion of the semaphore shared memory region until the other memory controllers have performed the write access to their copy of the semaphore shared memory region. The values stored in the semaphore shared memory region indicate which controller currently has access to the shared resource.