[Qt-interest] QT 4.6.2 hangs in processEvents()

[srikanth bemineni]

Hi,

I found this in QT bug list

https://bugreports.qt.nokia.com//browse/QTBUG-12721

It looks pretty similar to the problem that we are facing.If some body from
QT development team can confirm this we can suggest our team to move forward
to the later version where the problem is fixed.

On Wed, Aug 24, 2011 at 10:28 PM, Tony Rietwyk <
tony.rietwyk at rightsoft.com.au> wrote:

> Hi Srikanth, ****
>
> ** **
>
> I have a similar problem in 4.6.0 using
> QEventLoop.exec(QEventLoop::ExcludeUserInputEvents) in a QSqlDriver derived
> class that sends the requests using QNAM.post.  I haven’t raised the
> problem, since it is very complicated to explain, but it also involves a
> progress dialog which stops animating – no matter where the mouse is.  If I
> debug and break during the hang, the same line of code is selected.  In my
> case, the number of handles (ncount) == 0.  ****
>
> ** **
>
> I looked at the 4.7.2 sources and see that the block of code in
> qeventdispatcher_win looks the same.  ****
>
> ** **
>
> In my case the problem occurs when a QListWidget has been populated, and it
> executes sql whenever an item is selected.  If the user selects items
> slowly, then it works no problem.  But if the user holds down an arrow key
> (thereby selecting items very fast) then the problem occurs.  ****
>
> ** **
>
> Please let me know if you find a solution to your problem! ****
>
> ** **
>
> Thanks, ****
>
> ** **
>
> Tony****
>
> ** **
>
> ** **
>
> *From:* qt-interest-bounces+tony.rietwyk=rightsoft.com.au at qt.nokia.com[mailto:
> qt-interest-bounces+tony.rietwyk=rightsoft.com.au at qt.nokia.com] *On Behalf
> Of *srikanth bemineni
> *Sent:* Thursday, 25 August 2011 12:06 PM
> *To:* qt-interest at trolltech.com
> *Subject:* [Qt-interest] QT 4.6.2 hangs in processEvents()****
>
> ** **
>
> Hi,
>
> I am using Qt4.6.2 and I have seen some of the behaviors that I don't have
> any explanation
>
> 1. When I try to exit my application during the process when QWidgetTable
> is getting populated, the application gets stuck at the below code in
> qeventdispatcher_win.cpp
>
> emit aboutToBlock();
> waitRet = MsgWaitForMultipleObjectsEx(nCount, pHandles, INFINITE,
> QS_ALLINPUT, MWMO_ALERTABLE)
>
> 2. My progress bar used as busy bar stops animating until and unless mouse
> is moved on the application.
>
>
> Any body else have seen this behavior. The first problem is making my
> application to hang indefinitely.
>
> With regards
> Srikanth Bemineni****
>
> _______________________________________________
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> Qt-interest at qt.nokia.com
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>
>
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