'Re: [PyQt] Deadlock when endResetModel() triggers QQuickImageProvider asynchronously'

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List:       pykde
Subject:    Re: [PyQt] Deadlock when endResetModel() triggers QQuickImageProvider asynchronously
From:       Milorad Pop-Tosic <pop () hiri ! com>
Date:       2017-03-16 16:40:09
Message-ID: AMSPR06MB1668483E9F55FF74640607FC0260 () AMSPR06MB166 ! eurprd06 ! prod ! outlook ! com
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That did the trick. Thanks a lot!

________________________________
From: Phil Thompson <phil@riverbankcomputing.com>
Sent: Thursday, March 16, 2017 12:39:10 PM
To: Milorad Pop-Tosic
Cc: pyqt@riverbankcomputing.com
Subject: Re: [PyQt] Deadlock when endResetModel() triggers QQuickImageProvi=
der asynchronously

On 16 Mar 2017, at 12:07 pm, Milorad Pop-Tosic <pop@hiri.com> wrote:
>
> Hi,
>
> We're experiencing a deadlock when resetting a list model assigned to a Q=
ML ListView which in the delegate has an Image that calls QQuickImageProvid=
er with asynchronous: true. Theexecution never reaches requestImage in  QIm=
ageProvider. If asynchronous is false, everything works fine.
>
> I also tried subclassing QQuickAsyncImageProvider, but that behaves the s=
ame.
>
> The same example in C++ seems to work.
>
> The gist is here: https://gist.github.com/poptosic/b341511d3a0a6b7f09278c=
e5da7e20e7
>
> Tested on PyQt5.8.1 on Windows.
>
> Are we doing something wrong here?

It should be fixed in tonight's snapshot. In the meantime you can just add =
/ReleaseGIL/ to the beginResetModel() and endResetModel() methods of QAbstr=
actItemModel in qabstractitemmodel.sip.

Thanks,
Phil

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font-family:Calibri,Arial,Helvetica,sans-serif"> <p><span style="font-size:12pt">That \
did the trick. Thanks a lot!</span><br> </p>
</div>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" \
style="font-size:11pt"><b>From:</b> Phil Thompson \
&lt;phil@riverbankcomputing.com&gt;<br> <b>Sent:</b> Thursday, March 16, 2017 \
12:39:10 PM<br> <b>To:</b> Milorad Pop-Tosic<br>
<b>Cc:</b> pyqt@riverbankcomputing.com<br>
<b>Subject:</b> Re: [PyQt] Deadlock when endResetModel() triggers QQuickImageProvider \
asynchronously</font> <div>&nbsp;</div>
</div>
</div>
<font size="2"><span style="font-size:10pt;">
<div class="PlainText">On 16 Mar 2017, at 12:07 pm, Milorad Pop-Tosic \
&lt;pop@hiri.com&gt; wrote:<br> &gt; <br>
&gt; Hi,<br>
&gt; <br>
&gt; We're experiencing a deadlock when resetting a list model assigned to a QML \
ListView which in the delegate has an Image that calls QQuickImageProvider with \
asynchronous: true. Theexecution never reaches requestImage in&nbsp; QImageProvider. \
If asynchronous is  false, everything works fine.<br>
&gt; <br>
&gt; I also tried subclassing QQuickAsyncImageProvider, but that behaves the \
same.<br> &gt; <br>
&gt; The same example in C&#43;&#43; seems to work.<br>
&gt; <br>
&gt; The gist is here: <a \
href="https://gist.github.com/poptosic/b341511d3a0a6b7f09278ce5da7e20e7"> \
https://gist.github.com/poptosic/b341511d3a0a6b7f09278ce5da7e20e7</a><br> &gt; <br>
&gt; Tested on PyQt5.8.1 on Windows.<br>
&gt; <br>
&gt; Are we doing something wrong here?<br>
<br>
It should be fixed in tonight's snapshot. In the meantime you can just add \
/ReleaseGIL/ to the beginResetModel() and endResetModel() methods of \
QAbstractItemModel in qabstractitemmodel.sip.<br> <br>
Thanks,<br>
Phil</div>
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