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This is an automatically generated e-mail. To reply, visit:
<a href="https://git.reviewboard.kde.org/r/125217/">https://git.reviewboard.kde.org/r/125217/</a>
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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;">I had one comment/suggestion but the improvement itself looks good, especially replacing our probably-incorrect singleton initialization with Qt's threading code.</pre>
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<a href="https://git.reviewboard.kde.org/r/125217/diff/1/?file=403159#file403159line1889" style="color: black; font-weight: bold; text-decoration: underline;">src/lib/io/kdirwatch.cpp</a>
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(Diff revision 1)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">KDirWatch *KDirWatch::self()</pre></td>
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<th bgcolor="#f0f0f0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">1888</font></th>
<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">static</span> <span class="kt">bool</span> <span class="n">cleanupRegistered</span> <span class="o">=</span> <span class="nb">false</span><span class="p">;</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">static</span> <span class="kt">bool</span> <span class="n">cleanupRegistered</span> <span class="o">=</span> <span class="nb">false</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;">The changes themselves seem OK, but if this is really supposed to be thread-safe then shouldn't this cleanup registration also be using an atomic or some other sort of run-once protection? Or is it safe to register the cleanup routine other than once?</pre>
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<p>- Michael Pyne</p>
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<p>On September 13th, 2015, 8:18 p.m. UTC, David Faure wrote:</p>
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<div>Review request for KDE Frameworks, Albert Astals Cid and Michael Pyne.</div>
<div>By David Faure.</div>
<p style="color: grey;"><i>Updated Sept. 13, 2015, 8:18 p.m.</i></p>
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<b style="color: #575012; font-size: 10pt;">Repository: </b>
kcoreaddons
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<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 use of KDirWatch from KSycoca exposed that KDirWatch was really not
thread-safe. The internal singleton design brings a ton of races between
KDirWatch instances. Easy solution: one "singleton" per thread, using
QThreadStorage.
The main impact is on memory management; the "singleton" is no longer refcounted
but simply deleted at the end of the thread, by QThreadStorage (including for
the main thread). Since this happens at ~QApp time, we need to zero the d pointer
of KDirWatch::self(), which is deleted by a global-static dtor later on.</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;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">unittests in kcoreaddons still pass, but now kservice's ksycocathreadtest passes every time, unlike before.</p></pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>src/lib/io/kdirwatch.h <span style="color: grey">(f1593e73898c3610c2a560714ed608367120afa8)</span></li>
<li>src/lib/io/kdirwatch.cpp <span style="color: grey">(5e015c10cb99dbe4a21f944d4c0d0b364f2a7263)</span></li>
<li>src/lib/io/kdirwatch_p.h <span style="color: grey">(b2ac9d419bb0b0939a4eaa235a55634482db1cc6)</span></li>
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<p><a href="https://git.reviewboard.kde.org/r/125217/diff/" style="margin-left: 3em;">View Diff</a></p>
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