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A watchdog timer (WDT, or simply a watchdog), sometimes called a computer operating properly timer (COP timer), [1] is an electronic or software timer that is used to detect and recover from computer malfunctions. Watchdog timers are widely used in computers to facilitate automatic correction of temporary hardware faults, and to prevent errant ...
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Most models support a second instruction to reset the watchdog timer, which must alternate with the first; repetitions of one instruction are ignored. This permits two independent watchdog routines to run, and failure of either will trigger the watchdog. Holtek provide two indirect addressing registers, like the enhanced 14-bit PIC.
Command Loss Timer Reset systems involve both hardware and software. Most spacecraft have more than one Command Loss Timer Reset for subsystem level safety reasons, with the Voyager craft using at least 7 of these timers. Technically the Command Loss Timer Reset is a glorified array of Watchdog timers, each with different settings.
Single node systems use a comparable mechanism called a watchdog timer. A watchdog timer will reset the node if the node does not tell the watchdog circuit that it is operating well. A STONITH decision can be based on various decisions which can be customer specific plugins.
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Watchdog Timer support – Watchdog is a software timer that triggers a system reset action if the system hangs on crucial faults for an extended period of time. The watchdog mechanism can bring the system back from the nonresponsive state into normal operation by waiting until the timer goes off and subsequently rebooting the device.
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