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:
Feb. 05, 2008
Filed:
Apr. 29, 2003
Michael J. Donovan, Endicott, NY (US);
Melissa K. Howland, Endicott, NY (US);
Steven Shultz, Endicott, NY (US);
Xenia Tkatschow, Jamesville, NY (US);
Michael J. Donovan, Endicott, NY (US);
Melissa K. Howland, Endicott, NY (US);
Steven Shultz, Endicott, NY (US);
Xenia Tkatschow, Jamesville, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A technique to collectively manage locks by multiple virtual machines and then access shared data protected by the locks. A computer system defines first and second virtual machines and a memory shared by the first and second virtual machines. A lock structure is defined in the shared memory. The lock structure is capable of listing a holder of a lock for shared data in the shared memory. The first virtual machine acquires a lock for the shared data when available by manipulation of the lock structure. After acquiring the lock, the first virtual machine accesses the shared data. The lock structure and the shared data are directly accessible by the first virtual machine. The second virtual machine acquires a lock for the shared data when available by manipulation of the lock structure. After acquiring the lock, the second virtual machine accesses the shared data. The lock structure and shared data are directly accessible by the second virtual machine. In an alternate embodiment of the present invention, the shared data resides in one of the virtual machines while the lock structure remains in shared memory.