International Business Machines Corporation

Thomas Van Weaver

Gerald Francis McBrearty

Shawn Patrick Mullen

Johnny Meng-Han Shieh

Larry Bert Brenner

Jeffrey S Lucash

Barry P Lubart

John C Rathjen, Jr

Ronald Sasala

A method, system and apparatus for allowing a mirroring map to be used with more than one piece of data are provided. First, a mirroring map is created and given a name. Then, the name of the mirroring map and the mirroring map itself are stored into the computer system. When a piece of data is to be stored in accordance with the mirroring map any time thereafter, the name of the mirroring map is used to associate the mirroring map with the piece of data.

Apparatus and method of creating a mirroring map for use with different pieces of data

A method for serializing access to computer system resources without disabling interrupts in critical code sections or requiring excessive use of spin locks. A queue lock is introduced that allows an interrupt process to enqueue and be processed in turn without a spin lock and to block process code access to a particular resource until all interrupts are processed. Process level code is blocked from accessing a locked resource while requests for accesses from interrupt level code are queued in a deferred work queue which is processed prior to the release of the blocking lock. Establishment of deferred work queue means that processing can continue without disablement of interrupts and without significant overhead consumed by processes holding spin locks.

Interrupt handling serialization for process level programming

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Woodstock, NY, United States of America

Thomas Van Weaver