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:
Dec. 06, 2005
Filed:
Mar. 28, 2002
Timothy M. Damron, Austin, TX (US);
Teerasit Tinnakul, Pflugerville, TX (US);
Timothy M. Damron, Austin, TX (US);
Teerasit Tinnakul, Pflugerville, TX (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A system and method for a dual stage persistent reservation preemption protocol is presented. A first adapter registers with a shared device and obtains reservation ownership of the shared device. The first adapter sets an internal reservation owner flag to 'TRUE' in response to obtaining reservation ownership. The internal flag status is analyzed if the first adapter is de-registered from the shared device. When a second adapter preempts the first adapter to obtain reservation ownership, the first adapter loses its registration with the shared device. The first adapter receives an error message from the shared device in response to a request, and the first adapter checks its internal reservation owner flag status. If the first adapter's internal reservation owner flag status is 'TRUE', the first adapter re-registers with the shared device.