Excavating
Patent
1990-04-16
1994-01-11
Lee, Thomas C.
Excavating
395375, 371 163, 3642646, 364264, 3642644, 3642645, 3642672, 3642679, 364DIG1, G06F 1100
Patent
active
052789764
ABSTRACT:
Method and apparatus for detecting infinite tight loops and infinite inter-task loops in applications tasks in multi-task, real-time systems. In accordance with the inventive method, a low priority task, the idle task, is executed whenever no other task is ready to execute. Further, when the idle task executes it sets a flag. A higher priority, watch dog task executes and tests the flag. If the flag has been set, the watch dog task resets the flag and sends a signal to reset a watch dog timer, however, if the flag has not been set by the idle task for a predetermined time period, the watch dog task will stop resetting the watch dog timer. As a result, this will cause the watch dog timer to trigger and reset the system.
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Einschlag Michael B.
Harrity Paul
Lee Thomas C.
ROLM Company
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