The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 11, 1994
Filed:
Apr. 16, 1990
Solomon Wu, Milpitas, CA (US);
ROLM Company, Santa Clara, CA (US);
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.