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:
Jul. 19, 2011
Filed:
Jun. 25, 2010
David Francis Bacon, Sleepy Hollow, NY (US);
Perry Cheng, New York City, NY (US);
Vadakkedathu Thomas Rajan, Briarcliff Manor, NY (US);
David Francis Bacon, Sleepy Hollow, NY (US);
Perry Cheng, New York City, NY (US);
Vadakkedathu Thomas Rajan, Briarcliff Manor, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A garbage collection system that needs to meet real-time requirements uses an eager read barrier that performs a forwarding operation as soon as a quantity is loaded. The barrier maintains a to-space invariant by including a forwarding pointer in the header of objects to be moved or accessed that normally points to the object itself. However, if the object has been moved, the forwarding pointer points to the new object location. The eager read barrier maintains the registers and stack cells such that the registers and stack cells always point into to-space. Barrier-sinking and common sub-expression elimination are used to minimize the overhead associated with the read barrier.