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:
Nov. 25, 1997
Filed:
Jul. 16, 1996
Steven T Shaughnessy, Scotts Valley, CA (US);
Borland International, Inc., Scotts Valley, CA (US);
Abstract
A computer system having concurrently shared objects or resources is described. An exemplary embodiment includes a multi-user database management system having information tables and related objects stored in shared directories on a file server. A plurality of lock types, including directory lock, full lock, write lock, prevent full lock, and prevent write lock, are provided for controlling concurrent access. Methods are described for managing locks by creating a special lock file for each shared directory that is accessed. The lock file stores at least one logical lock file having locking or concurrency information specific to a family of related members. The logical lock file itself includes a plurality of entries for specifying concurrency information of associated family members. A shared object or resource is accessed according to the information retrieved from the corresponding logical lock file.