What happens if the watchdog timer is not pinged within its interval?

What happens if the watchdog timer is not pinged within its interval?

• A. The watchdog's ping typically increases performance.
• B. The system logs an event but continues operation.
• C. The system resets or transitions to a safe state.
• D. Nothing, it just continues monitoring.

Answer: (C)

A watchdog timer is there to ensure the system doesn’t stay stuck in a faulty state. If the software fails to ping or refresh the watchdog within the allotted interval, it signals that something has gone wrong—like a hang or deadlock. In response, the watchdog triggers a recovery action, typically resetting the processor or moving the system into a known safe state. This automatic reset helps restore normal operation and prevents the device from continuing to run unpredictably. The other ideas don’t fit because the watchdog’s purpose isn’t to boost performance or to let the system keep running after a failure. It also isn’t just a log event; the intended effect is a concrete recovery action to prevent unsafe behavior. And it doesn’t do nothing—its whole point is to enforce a timely recovery when health checks aren’t completed.

A watchdog timer is there to ensure the system doesn’t stay stuck in a faulty state. If the software fails to ping or refresh the watchdog within the allotted interval, it signals that something has gone wrong—like a hang or deadlock. In response, the watchdog triggers a recovery action, typically resetting the processor or moving the system into a known safe state. This automatic reset helps restore normal operation and prevents the device from continuing to run unpredictably.

The other ideas don’t fit because the watchdog’s purpose isn’t to boost performance or to let the system keep running after a failure. It also isn’t just a log event; the intended effect is a concrete recovery action to prevent unsafe behavior. And it doesn’t do nothing—its whole point is to enforce a timely recovery when health checks aren’t completed.