International Business Machines Corporation

Francis Alfred Kampf

Christine M Desnoyers

Derrick LeRoy Garmire

Douglas James Joseph

Robert Francis Bartfai

Jay Robert Herring

Craig Brian Stunkel

Kevin J Reilly

Nicholas P Rash

Robert Frederick Stucke

Antoinette Elaine Herrmann

A method, system, and associated program code and data structures are provided for a message processing system in which messages are passed from source nodes to destination nodes. Notification of the arrival of the messages at the destination nodes can be effected by programmable source initiated interrupts or destination initiated interrupts. The source initiated interrupts are implemented as set fields embedded in the message packets sent from a source node to a destination node and trigger the requisite interrupt at the destination node upon message arrival. The destination initiated interrupts are implemented as pre-set fields in anticipatory buffers which are allocated at the destination node for incoming messages from the source node. Standard incoming message queue polling, as well as interrupt enabling and disabling functions are also provided, which together allow the system to selectively invoke interrupt or alternative strategies to notify destination nodes of arriving messages.

Source and destination initiated interrupt system for message arrival

Source and destination initiated interrupt method for message arrival

Source and destination initiated interrupts for message arrival

A quiesced and synchronous distributed data processing system includes a primary node, a secondary node and a switch between the primary and secondary nodes. The TOD for the primary node is set depending on the system. The invention sets the TOD for the switch based on the TOD of the primary node. The primary node then verifies the switch TOD. If verified, the TOD for the secondary node is set, based on the TOD of the primary node. Finally, the secondary node self-verifies its TOD.

Verifying a time-of-day counter

An error message is generated by a hardware element of a distributed computer system, when an error is detected. The error message is then forwarded from the hardware element to one or more designated processing nodes of the distributed computer system. The hardware element includes, for instance, a switch element or a communications adapter adapted to report detected errors.

System of reporting errors by a hardware element of a distributed

Method of reporting errors by a hardware element of a distributed

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Fairfax, VT, United States of America

Francis Alfred Kampf