Brenda G Moreno

US Patent:

7624405, Nov 24, 2009

Filed:

Jun 17, 2005

Appl. No.:

11/156029

Inventors:

Chris B. Legg - Oceanside CA, US
Brenda Ann Moreno - Mission Viejo CA, US

Assignee:

Unisys Corporation - Blue Bell PA

International Classification:

G06F 3/00
G06F 9/44
G06F 9/46
G06F 13/00

US Classification:

719331, 717162, 717168, 709220, 709223

Abstract:

An embodiment of the invention is a technique for maintaining application availability during a change in a resource dynamic link library (DLL). A shim resource DLL is linked to a resource DLL managed by a resource manager in a clustered system. The managed resource DLL exports a function to control a resource in the clustered system. During a normal mode, the shim resource DLL passes to the managed resource DLL a call to an exported function unchanged. During a change mode, the shim resource DLL is unlinked from the managed resource DLL to allow the managed resource DLL to be changed, and the shim resource DLL handles a call to an exported function without passing the call to the managed resource DLL.