[Interest] QTimer stops triggering

[André Somers]

Op 4-6-2012 16:19, Pritam schreef:
> On Monday 04 June 2012 07:36 PM, Vannoote, Frederik wrote:
>>
>> Hi Syam,
>>
>> The Qtimer object is only created once and lives on for ever.
>>
>> It has an interval of 30 seconds.
>>
>> Most of the times they stop triggering after 1 or 2 days.
>>
> I dont know what timer API is used by Qt. If its posix timers 
> underneath, Can you try a simple app with posix timers and see if they 
> also misbehave.
> That way, we will know whether its a platform problem or qt problem.
Seems to me that no matter what technology Qt uses under the hood, it is 
always a Qt problem. Qt does not advertise any limitations on this 
front, so it should not suffer any. If the platform does not support the 
functionality directly, it is up to Qt to work around that IMHO.

André

>> Kind regards,
>>
>> Frederik
>>
>> Frederik Vannoote
>>
>> Sr. Development Engineer Software
>>
>> Barco nv
>>
>> Pres.Kennedypark 35
>>
>> B-8500 Kortrijk (Belgium)
>>
>> ------------------------------------------------------------------------
>>
>> *From:*interest-bounces+frederik.vannoote=barco.com at qt-project.org 
>> [mailto:interest-bounces+frederik.vannoote=barco.com at qt-project.org] 
>> *On Behalf Of *Syam Krishnan
>> *Sent:* 04jun12 16:04
>> *To:* interest at qt-project.org
>> *Subject:* Re: [Interest] QTimer stops triggering
>>
>> On 06/04/2012 12:34 PM, Vannoote, Frederik wrote:
>>
>> Hey all,
>>
>> I'm having a weird thing about Qtimer which I can't explain until now.
>>
>> We are using a dedicated application to kick the processor watchdog. 
>> This application is based on a QTimer. Basically, it only has to call 
>> an ioctl once every 30 seconds. This is the only thing the 
>> application does.
>>
>> We see that after a random time, the QTimer stops triggering. We have 
>> proven that it does not get stuck somewhere, it just does not get 
>> scheduled any more.
>>
>> I've replaced the code with a while loop instead of the QT event 
>> loop. That seems to be running fine.
>>
>>
>> Do you mean to say that you have set the QTimer to have a time-out of 
>> 30 seconds?
>> And what is the order of time after which the timer seems to stop 
>> working - minutes, hours?
>>
>> Also, (a wild shot) are you by any chance creating the timer objects 
>> afresh everytime?
>>
>> Syam
>>
>> DISCLAIMER:
>> Unless indicated otherwise, the information contained in this message 
>> is privileged and confidential, and is intended only for the use of 
>> the addressee(s) named above and others who have been specifically 
>> authorized to receive it. If you are not the intended recipient, you 
>> are hereby notified that any dissemination, distribution or copying 
>> of this message and/or attachments is strictly prohibited. The 
>> company accepts no liability for any damage caused by any virus 
>> transmitted by this email. Furthermore, the company does not warrant 
>> a proper and complete transmission of this information, nor does it 
>> accept liability for any delays. If you have received this message in 
>> error, please contact the sender and delete the message. Thank you.
>>
>
>
> -- 
> Regards,
> Pritam
> **************** CAUTION - Disclaimer *****************
> This e-mail contains PRIVILEGED AND CONFIDENTIAL INFORMATION intended solely
> for the use of the addressee(s). If you are not the intended recipient, please
> notify the sender by e-mail and delete the original message. Further, you are not
> to copy, disclose, or distribute this e-mail or its contents to any other person and
> any such actions are unlawful. This e-mail may contain viruses. Infosys has taken
> every reasonable precaution to minimize this risk, but is not liable for any damage
> you may sustain as a result of any virus in this e-mail. You should carry out your
> own virus checks before opening the e-mail or attachment. Infosys reserves the
> right to monitor and review the content of all messages sent to or from this e-mail
> address. Messages sent to or from this e-mail address may be stored on the
> Infosys e-mail system.
> ***INFOSYS******** End of Disclaimer ********INFOSYS***
>
>
>
> _______________________________________________
> Interest mailing list
> Interest at qt-project.org
> http://lists.qt-project.org/mailman/listinfo/interest

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.qt-project.org/pipermail/interest/attachments/20120604/cb46c4d9/attachment.html>