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This is an automatically generated e-mail. To reply, visit:
<a href="http://git.reviewboard.kde.org/r/106242/">http://git.reviewboard.kde.org/r/106242/</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;">A number of comments on the implementation, but also a more general comment: does it even make sense to use a Speller in multiple threads, and to change the language from one thread while another one is using the speller for spell-checking? It sounds like, even if a mutex/lock can prevent crashes, this is a weird thing to do anyway, since you have no idea at which point the spell-checking will switch to another language... could happen in the very middle of a sentence...
Maybe it would make more sense to "post" the language change operation to the spell-checking thread using the same mechanism as the one used to "post" spellchecking requests to it? (Disclaimer: I know nothing of the krunner architecture).</pre>
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<a href="http://git.reviewboard.kde.org/r/106242/diff/1/?file=81851#file81851line43" style="color: black; font-weight: bold; text-decoration: underline;">kdecore/sonnet/speller.cpp</a>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span><span class="p">(</span><span class="n">dict</span><span class="p">){</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">if() before delete is unnecessary, please revert this change.</pre>
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<a href="http://git.reviewboard.kde.org/r/106242/diff/1/?file=81851#file81851line51" style="color: black; font-weight: bold; text-decoration: underline;">kdecore/sonnet/speller.cpp</a>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">settings</span> <span class="o">=</span> <span class="n">loader</span><span class="o">-></span><span class="n">settings</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="n">settings</span> <span class="o">=</span> <span class="n">loader</span><span class="o">-></span><span class="n">settings</span><span class="p">();</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">That line is racy, if called from two different threads (copying a pointer is not atomic). If anything else, "helgrind" will warn for sure.
Move it inside the lock.</pre>
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<a href="http://git.reviewboard.kde.org/r/106242/diff/1/?file=81851#file81851line68" style="color: black; font-weight: bold; text-decoration: underline;">kdecore/sonnet/speller.cpp</a>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">return</span><span class="hl"> </span><span class="n"><span class="hl">dict</span></span><span class="p">;</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">return</span><span class="p">;</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This line is a no-op, remove it.</pre>
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<a href="http://git.reviewboard.kde.org/r/106242/diff/1/?file=81851#file81851line71" style="color: black; font-weight: bold; text-decoration: underline;">kdecore/sonnet/speller.cpp</a>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="kt">void</span> <span class="n">recreateDict</span><span class="p">(</span><span class="n">QString</span> <span class="n">lang</span><span class="o">=</span><span class="n">QString</span><span class="p">())</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">const QString& lang = QString()
(missing const ref, missing spaces)</pre>
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<a href="http://git.reviewboard.kde.org/r/106242/diff/1/?file=81851#file81851line73" style="color: black; font-weight: bold; text-decoration: underline;">kdecore/sonnet/speller.cpp</a>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span><span class="p">(</span><span class="n">lang</span><span class="p">.</span><span class="n">isEmpty</span><span class="p">()){</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">coding style: if (lang.isEmpty()) {
(space after if, space before brace). Same thing on other lines below.</pre>
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<a href="http://git.reviewboard.kde.org/r/106242/diff/1/?file=81851#file81851line74" style="color: black; font-weight: bold; text-decoration: underline;">kdecore/sonnet/speller.cpp</a>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">lang</span> <span class="o">=</span> <span class="n">language</span><span class="p">;</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">If setLanguage is called from another thread as the thread using "lang", then this creates a race on "lang".
Protect it with a mutex.
More generally, it seems that all member variables here need mutex protection, not just dict. So I'd rename dictLock to lock, and use it for all members.</pre>
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<a href="http://git.reviewboard.kde.org/r/106242/diff/1/?file=81851#file81851line80" style="color: black; font-weight: bold; text-decoration: underline;">kdecore/sonnet/speller.cpp</a>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span><span class="p">(</span><span class="n">dict</span><span class="p">){</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">See above. Delete NULL is perfectly valid (and no-op) in C++.</pre>
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<a href="http://git.reviewboard.kde.org/r/106242/diff/1/?file=81851#file81851line84" style="color: black; font-weight: bold; text-decoration: underline;">kdecore/sonnet/speller.cpp</a>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">dict</span><span class="o">=</span><span class="n">tmpdict</span><span class="p">;</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">spaces around =</pre>
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<a href="http://git.reviewboard.kde.org/r/106242/diff/1/?file=81851#file81851line130" style="color: black; font-weight: bold; text-decoration: underline;">kdecore/sonnet/speller.cpp</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">Speller::~Speller()</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">d</span><span class="o">-></span><span class="n">dictLock</span><span class="p">.</span><span class="n">lockForRead</span><span class="p">();</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Please use QReadLocker instead. This will simplify the code, no need for the 3-liner return at the end of the method.</pre>
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<p>- David</p>
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<p>On August 27th, 2012, 9:33 p.m., Simeon Bird wrote:</p>
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<div>Review request for kdelibs and Plasma.</div>
<div>By Simeon Bird.</div>
<p style="color: grey;"><i>Updated Aug. 27, 2012, 9:33 p.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;">Krunner's spellcheck plugin has been pretty broken since bd291d21f096a714a171e7af3a534ba345ca5659 (about two years ago) because it called Sonnet::Speller::setLanguage every time the spellchecker was invoked, which was (very much) not thread-safe.
This patch makes Sonnet::Speller::setLanguage threadsafe by protecting all access to the internal dict pointer using QReadWriteLock.
A related review request is 106244, which adds more fixes to the spellcheck feature.</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;">Compiled, installed, used for a week or so, spellchecked a bunch of things.</pre>
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<b style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Bugs: </b>
<a href="http://bugs.kde.org/show_bug.cgi?id=264779">264779</a>,
<a href="http://bugs.kde.org/show_bug.cgi?id=303831">303831</a>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>kdecore/sonnet/speller.cpp <span style="color: grey">(b19e74d)</span></li>
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<p><a href="http://git.reviewboard.kde.org/r/106242/diff/" style="margin-left: 3em;">View Diff</a></p>
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