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.:

US 7058669 B1

Date of Patent:

Jun. 06, 2006

Filed:

Feb. 07, 2001

Non-zero null reference to speed up write barrier checking for garbage collection

Applicant:

Stephen Thomas, High Wycombe, GB;

Inventor:

Stephen Thomas, High Wycombe, GB;

Assignee:

Esmertec AG, Dubendorf, CH;

Attorney:

Caesar, Rivise, Bernstein, Cohen & Pokotilow, Ltd.

Primary Examiner:

Jack A Lane

Int. Cl.

CPC ...

G06F 17/30 (2006.01);

U.S. Cl.

CPC ...

Abstract

A method and system of increasing the speed of a write barrier check. Instead of using zero null references, in one embodiment of the invention a special object is created at a valid and globally accessible location in memory. The special object is colored black, and the valid location of the special object is used in objects linked lists, and other elements whenever a null value is required. Preferably, the special object is colored black by coloring a bit pattern in a header of the special object to represent black.

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Thomas, Stephen. (2006). Non-zero null reference to speed up write barrier checking for garbage collection (U.S. Patent No. 7058669). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/7058669

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