Method for detecting infinite loops by setting a flag indicating execution of an idle task having lower priority than executing application tasks
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United States of America Patent
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Jan 11, 1994
Grant Date -
N/A
app pub date -
Apr 16, 1990
filing date -
Apr 16, 1990
priority date (Note) -
Expired
status (Latency Note)
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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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