Maintaining availability during change of resource dynamic link library in a clustered system
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United States of America Patent
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Nov 24, 2009
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app pub date -
Jun 17, 2005
filing date -
Jun 17, 2005
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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.
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