Boots – shoes – and leggings
Patent
1991-06-28
1993-06-15
Heckler, Thomas M.
Boots, shoes, and leggings
364DIG1, 3642853, 3642689, 3642672, G06F 1100
Patent
active
052206688
ABSTRACT:
A state machine in a digital data processor in a UNIX-type operating system environment has state managers associated with the functional units of the data processor for indicating the state of the units; a message handler for, alternately, (a) generating requests for processing event messages indicative of conditions in the processor, that are awaiting processing and (b) generating a request for evaluation of one state manager's maintenance state, limited to transition from one state to another; and a scheduling means responsive to requests from the message handler for selectively processing the event messages, to the passage of time, and to changes of state of state managers, and for scheduling evaluation of a state manager's maintenance state. The scheduling means schedules evaluation of respective state manager's maintenance states according to a priority determined by (a) dependencies between state managers, wherein one state manager is dependent on another state manager, and (b) priorities set by scheduling conditions registered by state managers. The scheduling means executes the steps of (a) evaluating a predetermined input condition, (b) selectively making a state transition in accord with that input condition and the state manager's maintenance state, and (c) selectively performing a predetermined action associated with said transition.
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Heckler Thomas M.
Stratus Computer, Inc.
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