Electrical computers and digital processing systems: multicomput – Computer network managing – Computer network access regulating
Reexamination Certificate
2006-05-16
2006-05-16
Pwu, Jeffrey C. (Department: 2143)
Electrical computers and digital processing systems: multicomput
Computer network managing
Computer network access regulating
C709S226000, C709S223000, C709S238000
Reexamination Certificate
active
07047299
ABSTRACT:
The present invention provides a process for implementing a generic Cluster wide lock broker that enables Clients attached to a Node on the Cluster to determine whether a lock can be established on a Resource and whether conflicting active locks are already held by another Peer Node. The process utilizes lock request that include a lock name identifying the desired Resource. Each lock request is compared by a lock broker daemon resident on each Node of the Cluster against a Lock Broker Table identifying active locks currently held by any client associated with each specific Peer Node. Additionally, the process enables the use and creation of customized locks by utilizing intent modes, which designate how a Client desires to utilize a Resource, and deny modes, which designate how a Client desires to prevent other Clients from utilizing a Resource. Further, lock requests initially denied because an active lock exists for the desired Resource can be placed in a wait state and re-requested upon releasing of the active lock.
REFERENCES:
patent: 5596754 (1997-01-01), Lomet
patent: 5699500 (1997-12-01), Dasgupta
patent: 6438705 (2002-08-01), Chao et al.
patent: 6466978 (2002-10-01), Mukherjee et al.
patent: 2001/0056554 (2001-12-01), Chrabaszcz
Hewlett--Packard Development Company, L.P.
Pwu Jeffrey C.
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