Electrical computers and digital processing systems: memory – Storage accessing and control – Shared memory area
Reexamination Certificate
2006-06-30
2009-06-30
Sough, Hyung S (Department: 2188)
Electrical computers and digital processing systems: memory
Storage accessing and control
Shared memory area
C718S107000, C714S006130
Reexamination Certificate
active
07555614
ABSTRACT:
Methods, systems, and computer program products for preventing concurrent execution of conflicting software operations on the same and different storage processors while avoiding the deadlocks are disclosed. According to one method, first and second instances of a first software utility for respectively executing on the first and second storage processors having access to a storage medium are provided. First and second instances of the second software utility for respectively executing on the first and second storage processors are also provided. A lock is provided to instances of the first utility. The lock makes exclusive the operations of checking for an activity query from instances of the second utility and receiving a query from instances of the second utility. A first operation implemented by the first utility may fail if the activity query has been received when the checking occurs.
REFERENCES:
patent: 6175853 (2001-01-01), Stracke, Jr.
patent: 6721902 (2004-04-01), Cochran
Bezera Anita I.
Haynes Michael D.
Hotle William Paul
Pathak Saurabh M.
Taylor Alan L.
Doan Duc T
EMC Corporation
Jenkins Wilson Taylor & Hunt, P.A.
Sough Hyung S
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