Method for controlling processor access to input/output devices

Details Method for controlling processor access to input/output devices Method for controlling processor access to input/output devices

1986-11-12

1989-03-14

Heckler, Thomas M.

Boots, shoes, and leggings

G06F 1300, G06F 1314

Patent

active

048129682

ABSTRACT:
A method for controlling processor access to input/output control units and devices connected to the control units to prevent control unit and device lookout due to the condition where the channel turn-around time becomes less than the device controller's housekeeping time is disclosed. The problem of control unit and device lockout is overcome by monitoring path and device activity for a given processor while at the same time keeping track of other processors waiting for a given path and device. When it is determined that a given number of consecutive input/output operations have been accomplished for a given processor and at the same time another processor requires this resource, then a busy condition will be asserted for new input/output requests from the current processor for the currently accessed path and/or device. This action forces the offending processor to wait until the controller and/or the device is again available.

REFERENCES:
patent: 3949371 (1976-04-01), Pederzini
patent: 4130864 (1978-12-01), Schlotterer
patent: 4232294 (1980-11-01), Burke et al.
patent: 4385382 (1983-05-01), Goss et al.
patent: 4393470 (1983-07-01), Miard
patent: 4470112 (1984-09-01), Dimmick
patent: 4603382 (1986-07-01), Cole et al.
patent: 4675812 (1987-06-01), Capowski et al.

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