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This is an automatically generated e-mail. To reply, visit:
<a href="http://git.reviewboard.kde.org/r/102238/">http://git.reviewboard.kde.org/r/102238/</a>
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<p style="margin-top: 0;">On August 18th, 2011, 8:39 p.m., <b>Albert Astals Cid</b> wrote:</p>
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<a href="http://git.reviewboard.kde.org/r/102238/diff/5/?file=32029#file32029line406" style="color: black; font-weight: bold; text-decoration: underline;">kio/kio/hostinfo.cpp</a>
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(Diff revision 5)
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<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">void HostInfoAgentPrivate::lookupFinished()</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">connect</span><span class="p">(</span><span class="kr">thread</span><span class="p">,</span> <span class="n">SIGNAL</span><span class="p">(</span><span class="n">finished</span><span class="p">()),</span> <span class="k">this</span><span class="p">,</span> <span class="n">SLOT</span><span class="p">(</span><span class="n">lookupFinished</span><span class="p">()));</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">You are connecting thread finished to lookupFinished to try to reuse the thread and then in the constructor you are connecting thread finished to deleteLater. How is this going to work?</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">That is a mistake. The connection in the constructor was supposed to be gone since the thread is now reused. The deleteLater slot of the thread should instead be connected to HostInfoAgentPrivate's destroyed signal. Thanks for the catch, I will update the patch.</pre>
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<p>- Dawit</p>
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<p>On August 17th, 2011, 5:40 a.m., Dawit Alemayehu wrote:</p>
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<div>Review request for kdelibs, David Faure and Thiago Macieira.</div>
<div>By Dawit Alemayehu.</div>
<p style="color: grey;"><i>Updated Aug. 17, 2011, 5:40 a.m.</i></p>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">The attached patch is an alternate approach to address the issue of crashes that arise from terminating an active thread than the one proposed at https://git.reviewboard.kde.org/r/102179/. With this patch the function "QHostInfo::lookupHost(QString, int)" avoids the use of QThread::terminate with the following fairly simple changes:
- Connect its finished signal to its parent deleteLater slot in the ctor so that the thread is automatically deleted later.
- Store the looked up DNS info in the global cache to avoid unnecessary queries for the same request.
- Check for cached DNS information and avoid doing reverse look ups before resorting to performing DNS queries in a separate thread.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Tested with the following code based on Albert's post.
#include "hostinfo_p.h"
#include <QtGui/QApplication>
#include <QtCore/QElapsedTimer>
#include <QtNetwork/QHostInfo>
int main(int a, char **b)
{
QApplication app(a, b);
QElapsedTimer t;
t.start();
qDebug() << KIO::HostInfo::lookupHost("www.kde.org", 0).addresses();
qDebug() << "Time:" << t.elapsed() << "ms";
}
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>kio/kio/hostinfo.cpp <span style="color: grey">(344b1d8)</span></li>
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<p><a href="http://git.reviewboard.kde.org/r/102238/diff/" style="margin-left: 3em;">View Diff</a></p>
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