Lock acquisition among nodes of divided cluster

Details Lock acquisition among nodes of divided cluster Lock acquisition among nodes of divided cluster

2011-08-02

2011-08-02

Bhatia, Ajay (Department: 2445)

Data processing: database and file management or data structures

Data integrity

Concurrent read/write management using locks

C709S226000

Reexamination Certificate

active

07991753

ABSTRACT:
The acquisition of a lock among nodes of a divided cluster is disclosed. A method is performable by each of at least one node of the cluster. A node waits for a delay corresponding to its identifier. The node asserts intent to acquire the lock by writing its identifier to X and Y variables where another node has failed to acquire the lock. The node waits for another node to acquire the lock where the other node has written to X, and proceeds where Y remains equal to its own identifier. The node waits for another node to acquire the lock where the other node has written to a Z variable, and writes its own identifier to Z and proceeds where the other node has failed. The node writes a value to Y indicating that it is acquiring the lock, and maintains acquisition by periodically writing to Z.

REFERENCES:
patent: 5673384 (1997-09-01), Hepner et al.
patent: 6279032 (2001-08-01), Short et al.
patent: 6314526 (2001-11-01), Arendt et al.
patent: 2003/0078996 (2003-04-01), Baldwin
patent: 2005/0010838 (2005-01-01), Davies et al.
patent: 2005/0015657 (2005-01-01), Sugiura et al.

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