Multi-processor system with communication controller using poll

Details Multi-processor system with communication controller using poll Multi-processor system with communication controller using poll

1983-03-24

1985-08-20

Thomas, James D.

Boots, shoes, and leggings

370 85, 3408255, G06F 304, G06F 1516

Patent

active

045368384

ABSTRACT:
A communication controller for a distributed processing system has a number of data processing stations in which messages are exchanged among the stations over a communication channel. The controller includes a communications processing unit which manages the transmission and receipt of messages. A program is provided for the communications processing unit which responds to an inbound message addressed to the associated station with its poll flag asserted to cause the station to immediately contend for use of the channel. No other station can contend for use of the channel at this time because their corresponding communication processing units responded to such inbound message as being addressed to another station. This causes a predetermined time interval to start. Each of the other units then awaits expiration of the interval before attempting to contend for use of the channel. This assures immediate use of the channel to the station which receives an inbound message addressed to it with a poll flag asserted.

REFERENCES:
patent: 4210780 (1980-07-01), Hopkins
patent: 4271505 (1981-06-01), Menot
patent: 4380065 (1983-04-01), Hirtle et al.
patent: 4387441 (1983-06-01), Kocol
patent: 4445213 (1984-04-01), Baugh et al.
patent: 4456956 (1984-06-01), El-Gohary
patent: 4464749 (1984-08-01), Ulug
patent: 4494113 (1985-01-01), Yamaoka et al.

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