Watchdog

Watchdog may refer to:

Animals

Business and society

Computing

Entertainment

Watchdog (TV series)

Watchdog is a BBC television series that investigates viewers' reports of problematic experiences with traders, retailers, and other companies around the UK. It has had great success in changing the awareness consumers have of their purchasing rights and in changing policies of companies, closing down businesses, and pushing for law changes. It has the longstanding slogan "the programme you cannot afford to miss". The show has seen a variety of hosts and its new series is currently presented by Sophie Raworth, Chris Hollins, Matt Allwright and Michelle Ackerley.

It is shown on BBC One and is available for online viewing or download via BBC iPlayer.

History

Watchdog was first shown on 8 September 1980 as a weekly slot on BBC1's news magazine programme Nationwide. Hugh Scully, best known for presenting the Antiques Roadshow, was the original host. Nationwide ended in 1983, but Watchdog continued with its successor, Sixty Minutes. Sixty Minutes lasted only nine months, and Scully left the programme at the end of the 1984 series.

Watchdog timer

A watchdog timer (sometimes called a computer operating properly or COP timer, or simply a watchdog) is an electronic timer that is used to detect and recover from computer malfunctions. During normal operation, the computer regularly restarts the watchdog timer to prevent it from elapsing, or "timing out". If, due to a hardware fault or program error, the computer fails to restart the watchdog, the timer will elapse and generate a timeout signal. The timeout signal is used to initiate corrective action or actions. The corrective actions typically include placing the computer system in a safe state and restoring normal system operation.

Watchdog timers are commonly found in embedded systems and other computer-controlled equipment where humans cannot easily access the equipment or would be unable to react to faults in a timely manner. In such systems, the computer cannot depend on a human to reboot it if it hangs; it must be self-reliant. For example, remote embedded systems such as space probes are not physically accessible to human operators; these could become permanently disabled if they were unable to autonomously recover from faults. A watchdog timer is usually employed in cases like these. Watchdog timers may also be used when running untrusted code in a sandbox, to limit the CPU time available to the code and thus prevent some types of denial-of-service attacks.