Window watchdog timer

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Window watchdog timer

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window watchdog timer

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It only takes a minute to sign up. Can someone please explain how windowed watchdog timer is different from the normal watchdog timer? When is windowed watchdog timer prefferred over normal watchdog timer? If your processor happens to be stuck during execution, it will fail to re-arm the watchdog, an the "tic-tac" bomb will be triggered. Then, the watchdog's job is to re-initialize the stuck system, or trigger an alarm, or execute specific instructions etc So basically, a watchdog protects a system from being stuck.

But it is not able to exit the loop like it should be in normal operation. If you use a simple watchdog, it will be able to be re-armed at every iteration and your system will never be re-initialized and will stay stuck in this infinite loop.

That's why the window watchdog exists : it protects the system against being stuck by needing periodical refresh like in 1but it also detects when it is re-armed "too much" compared to what it knows to be the nominal system's operation. It's like a watchdog 2. Picture below from Microchip describing a windowed watchdog:. Sign up to join this community.

The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Windowed watchdog timer Ask Question. Asked 4 years, 8 months ago. Active 1 year, 8 months ago. Viewed 5k times. I am working on ARM processor which implements window watchddog. But I dont understand the need of implementing window watchdog.

I think its enough to select a time period in which watchdog should restart. Then why to implement windows, closed and open in the watchdog.

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Active Oldest Votes. MaximGi MaximGi 6 6 silver badges 18 18 bronze badges. But as you said "for example, is stuck inside an infinite loop. If you use a simple watchdog, it will be able to be re-armed at every iteration". I didn't get your this point.

If my system get stuck, how come the watchdog gets rearmed at every iteration?By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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Information Security Stack Exchange is a question and answer site for information security professionals. It only takes a minute to sign up. I tried googling around but I only found posts on how to fix Watchdog errors, but nothing on what Watchdog really is or how it works. So, what is Watchdog exactly? Does it have some kind of security implications?

The existence of a watchdog timer software or hardware has no security implications. A watchdog is a timer that is used to detect hardware or software lockups. A watchdog timer counts down and, if it ever reaches zero, it will assume the system has frozen and will take corrective action such as by rebooting the computer. In order to prevent this from happening, a process will periodically reset the watchdog, usually once every few seconds.

In the case that this process ever stops functioning for example due to the computer locking upthe watchdog will keep ticking down until it eventually reaches zero and causes a reboot. The amount of time that must lapse varies from milliseconds to full minutes, depending on how fast the system must respond to a malfunction.

A software watchdog is designed to detect userspace user programs freezing or otherwise becoming unresponsive.

It's only capable of working if the kernel the core of the OS is still functional. A hardware watchdog is usually built into the motherboard and will detect a system lock up no matter what, as a frozen or crashed computer will stop resetting it, causing it to force the system to restart.

See Watchdog timer on Wikipedia for more information. Sign up to join this community. The best answers are voted up and rise to the top. What is Windows Watchdog and what do we know about it? Ask Question. Asked 1 year, 6 months ago. Active 1 year, 6 months ago. Viewed 3k times.Camilla Mo. Irritating as it may seems, this blue screen of death error can be solved. And here we are, giving you 6 of the most useful fixes for your blue screen of death issue. If this is the very first time that you ran into this problem, you should go and check to see if you have all the Windows Update patches installed correctly.

Just wait for it to finish its job. Check to see if the blue screen of death error is gone. If not, please go to the methods below. Be sure to choose only drivers that are compatible with your variant of Windows Driver Easy will automatically recognize your system and find the correct drivers for your hardware devices, and your variant of Windows 10, and it will download and install them correctly :.

This error is sometimes caused by interference from a third-party antivirus software. Consult your antivirus documentation for instructions on disabling it. If this resolves the problem, contact the vendor of your antivirus software and ask them for advice, or install a different antivirus solution.

If the problem persists, try to update the BIOS. There is a big possibility that this blue screen error is related to errors in your hardware memory. You can run a RAM check to see if problem is resolved:. This blue screen of death error could also happen if some of your system files are corrupted, or lost.

You can try to get this problem fixed by running the built-in System File Checker:. Check to see if the blue screen of death error happens again. She is now the author of Driver Easy. Before working as a writer, she was a technical support helping people to solve their computer problems. She enjoys providing solutions to computer problems and loves exploring new technologies.

Camilla Mo Last Updated: 10 months ago. Then restart your computer in Safe Modeand try the fixes here. Be extra careful about what sites you visit, what emails you open and what files you download when your antivirus is disabled.A watchdog timer sometimes called a computer operating properly or COP timer, or simply a watchdog is an electronic or software timer that is used to detect and recover from computer malfunctions. During normal operation, the computer regularly resets the watchdog timer to prevent it from elapsing, or "timing out".

If, due to a hardware fault or program error, the computer fails to reset the watchdog, the timer will elapse and generate a timeout signal. The timeout signal is used to initiate corrective 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 invoke a reboot 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.

IntelĀ® Watchdog Timer Utility

Watchdog timers may also be used when running untrusted code in a sandboxto limit the CPU time available to the code and thus prevent some types of denial-of-service attacks. Watchdog timers are also used in operating systems where certain high priority operations are required to complete in a specific time interval. If the timer expires before the operation completes then the OS responds to the timer interrupt by recording error data and terminating the operation.

A system may have both types of watchdog timer. The act of restarting a watchdog timer, commonly referred to as "kicking" the watchdog [2] [3]is typically done by writing to a watchdog control port. Alternatively, in microcontrollers that have an integrated watchdog timer, the watchdog is sometimes kicked by executing a special machine language instruction or setting a specific bit in a register.

In computers that are running operating systemswatchdog resets are usually invoked through a device driver. The device driver, which serves to abstract the watchdog hardware from user space programs, is also used to configure the time-out period and start and stop the timer.

Watchdog timers come in many configurations, and many allow their configurations to be altered. Microcontrollers often include an integrated, on-chip watchdog. In other computers the watchdog may reside in a nearby chip that connects directly to the CPUor it may be located on an external expansion card in the computer's chassis.Translate to English. Stay informed about special deals, the latest products, events, and more from Microsoft Store.

window watchdog timer

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