Fault-tolerant method of communicating between processes in a mu

Details Fault-tolerant method of communicating between processes in a mu Fault-tolerant method of communicating between processes in a mu

1992-12-21

1995-04-04

Kulik, Paul V.

Boots, shoes, and leggings

395200, 395650, 364DIG1, 3642645, 3642665, 3642689, G06F 1130

Patent

active

054045010

ABSTRACT:
A method for communicating between processes in a data processing system comprising a plurality of processor hosts each coupled to a network and a plurality of processes resident on different ones of said processor hosts, wherein messages are transmitted from one process to another in a logical ring. A message-holding queue is maintained at any host originating a message transmission, and it contains a copy of the message, an identifier of the initiating processor host, and an identifier of the target processor host. A forward notification message is returned to the originating host from a forwarding host when the forwarding host relays the message to another host, and an identical forward notification message is returned to the originating host by the target host when it receives the message. If the host on which the message currently resides becomes separated from the initiating host or terminates operation, or if any process becomes inactive after receiving the message and before relaying it to the next host or is unable to relay the message, flags may be set in the message, and, if necessary, the originating host retransmits the message into the logical ring.

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