International Business Machines Corporation

Robert M Whalen, Jr

Kenneth J Oakes

Richard K Errickson

Janet R Easton

John S Trotter

Joachim Von Buttlar

Martin Taubert

Elke G Nass

Andrew W Piechowski

Ambrose Verdibello

Welela Haileselaissie

Geoffrey A Crew

A computer program product, apparatus and method for negating initiative for select entries from a shared, strictly FIFO initiative queue in a multi-tasking multi-processor environment. An exemplary embodiment includes a computer program product for negating initiative for select entries from a shared initiative queue in a multi-tasking multi-processor environment, the computer program product including a tangible storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method including identifying an element within the environment that has failed and recovered, not removing the element from the shared initiative queue and entering a boundary element entry into the shared initiative queue.

Negating initiative for select entries from a shared, strictly FIFO initiative queue

Disclosed are a method and system of tracking real time use of I/O control blocks on a processing unit basis, in a multiprocessing system, such that in the case of a processing unit failure, a list accurately and concisely identifies the control blocks that need to be recovered. This eliminates the need to scan all the I/O control blocks, greatly reducing the overall system recovery time and minimizing impact to the rest of the running system. The preferred embodiment of the invention uses a task control block structure to record which I/O control blocks are in use by each Processing Unit. Also, the lock word structure defined in the I/O control blocks is provided with an index back into the task control block to facilitate managing the task control block entries.

Method and system for state tracking and recovery in multiprocessing computing systems

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Tivoli, NY, United States of America

Robert M Whalen, Jr