Interruption systems for externally changing a context of progra

Details Interruption systems for externally changing a context of progra Interruption systems for externally changing a context of progra

1989-02-13

1991-10-15

Fleming, Michael R.

Boots, shoes, and leggings

3642415, 3642302, 3642472, G06F 946

Patent

active

050579975

ABSTRACT:
In a programmed machine, such as an peripheral controller, programmed operations are executed in a one of several operational contexts. Each context may be initiated by a corresponding interruption signal. Any context which has been activated remains active until quiesced by program execution. One of the active contexts is a current context in which all instruction executions are currently occurring. In each cycle of the programmed machine, all active contexts and received and stored interruption signals, each for respective ones of the contexts, are compared to find the context highest priority context. Such highest priority context is compared with the current context priority for determining whether or not the programmed machine should change current contexts.

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