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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/200561">200561</a></dd>
<dt>Author</dt> <dd>ddkilzer@apple.com</dd>
<dt>Date</dt> <dd>2016-05-08 12:11:03 -0700 (Sun, 08 May 2016)</dd>
</dl>
<h3>Log Message</h3>
<pre>Roll out: ThreadSanitizer: Data race and thread leak in WebCore::ScrollingThread::createThreadIfNeeded
<https://webkit.org/b/157462>
This reverts commit <a href="http://trac.webkit.org/projects/webkit/changeset/200554">r200554</a>.
This doesn't fix the data race, and the thread leak is a
separate issue.
* page/scrolling/ScrollingThread.cpp:
(WebCore::ScrollingThread::createThreadIfNeeded): Roll out the
change.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourceWebCoreChangeLog">trunk/Source/WebCore/ChangeLog</a></li>
<li><a href="#trunkSourceWebCorepagescrollingScrollingThreadcpp">trunk/Source/WebCore/page/scrolling/ScrollingThread.cpp</a></li>
</ul>
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<div id="patch">
<h3>Diff</h3>
<a id="trunkSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/ChangeLog (200560 => 200561)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog 2016-05-08 19:05:25 UTC (rev 200560)
+++ trunk/Source/WebCore/ChangeLog 2016-05-08 19:11:03 UTC (rev 200561)
</span><span class="lines">@@ -1,3 +1,17 @@
</span><ins>+2016-05-08 David Kilzer <ddkilzer@apple.com>
+
+ Roll out: ThreadSanitizer: Data race and thread leak in WebCore::ScrollingThread::createThreadIfNeeded
+ <https://webkit.org/b/157462>
+
+ This reverts commit r200554.
+
+ This doesn't fix the data race, and the thread leak is a
+ separate issue.
+
+ * page/scrolling/ScrollingThread.cpp:
+ (WebCore::ScrollingThread::createThreadIfNeeded): Roll out the
+ change.
+
</ins><span class="cx"> 2016-05-08 Darin Adler <darin@apple.com>
</span><span class="cx">
</span><span class="cx"> Follow-up to that last patch (missed review comments).
</span></span></pre></div>
<a id="trunkSourceWebCorepagescrollingScrollingThreadcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/page/scrolling/ScrollingThread.cpp (200560 => 200561)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/page/scrolling/ScrollingThread.cpp 2016-05-08 19:05:25 UTC (rev 200560)
+++ trunk/Source/WebCore/page/scrolling/ScrollingThread.cpp 2016-05-08 19:11:03 UTC (rev 200561)
</span><span class="lines">@@ -74,21 +74,19 @@
</span><span class="cx">
</span><span class="cx"> void ScrollingThread::createThreadIfNeeded()
</span><span class="cx"> {
</span><del>- static std::once_flag onceFlag;
- std::call_once(onceFlag, [&] {
- // Wait for the thread to initialize the run loop.
- {
- std::unique_lock<Lock> lock(m_initializeRunLoopMutex);
</del><ins>+ if (m_threadIdentifier)
+ return;
</ins><span class="cx">
</span><del>- m_threadIdentifier = createThread(threadCallback, this, "WebCore: Scrolling");
</del><ins>+ // Wait for the thread to initialize the run loop.
+ {
+ std::unique_lock<Lock> lock(m_initializeRunLoopMutex);
+
+ m_threadIdentifier = createThread(threadCallback, this, "WebCore: Scrolling");
</ins><span class="cx">
</span><span class="cx"> #if PLATFORM(COCOA)
</span><del>- m_initializeRunLoopConditionVariable.wait(lock, [this] {
- return m_threadRunLoop;
- });
</del><ins>+ m_initializeRunLoopConditionVariable.wait(lock, [this]{ return m_threadRunLoop; });
</ins><span class="cx"> #endif
</span><del>- }
- });
</del><ins>+ }
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> void ScrollingThread::threadCallback(void* scrollingThread)
</span></span></pre>
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