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:
Oct. 26, 2010
Filed:
Jan. 25, 2005
Nikola Grcevski, Toronto, CA;
Kevin A. Stoodley, Richmond Hill, CA;
Mark G. Stoodley, Thornhill, CA;
Vijay Sundaresan, North York, CA;
Nikola Grcevski, Toronto, CA;
Kevin A. Stoodley, Richmond Hill, CA;
Mark G. Stoodley, Thornhill, CA;
Vijay Sundaresan, North York, CA;
International Business Machines Corporation, Armonk, NY (US);
Abstract
Under the present invention, a locking primitive associated with a shared data object is automatically transformed to allow multiple read-only locks if certain conditions are met. To this extent, when a read-only lock on a shared data object is desired, a thread identifier of an object header lock word (hereinafter 'lock word') associated with the shared data object is examined to determine if a read-write lock on the shared data object already exists. If not, then the thread identifier is set to a predetermined value indicative of read-only locks, and a thread count in the lock word is incremented. If another thread attempts a read-only lock, the thread identifier will be examined for the predetermined value. If it is present, the thread count will be incremented again, and a second read-only lock will be simultaneously established.