[Interest] QTimer stops triggering

[Pritam]

On Monday 04 June 2012 07:55 PM, André Somers wrote:
> 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.
>
I was just trying to rule out the possibility of a platform bugs. May be 
your platform vendor has not done a good job at creating/porting 
platform software on the
hardware that you use.

> 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
>>>
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>>
>>
>> -- 
>> Regards,
>> Pritam
>>
>>
>>
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>


-- 
Regards,
Pritam


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