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        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [ThreadedCompositor] Use WTF::Condition together with WTF::Lock"
   href="https://bugs.webkit.org/show_bug.cgi?id=148493">148493</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[ThreadedCompositor] Use WTF::Condition together with WTF::Lock
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>WebKit
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>WebKit Local Build
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Unspecified
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Unspecified
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>Normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P2
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>New Bugs
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>webkit-unassigned&#64;lists.webkit.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>emanuele.aina&#64;collabora.com
          </td>
        </tr></table>
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        <pre>The recent switch to WTF::Lock results in build failures with ENABLE_THREADED_COMPOSITOR=ON:

../../Source/WebKit2/Shared/CoordinatedGraphics/threadedcompositor/ThreadedCompositor.cpp: In member function ‘void WebKit::ThreadedCompositor::createCompositingThread()’:
../../Source/WebKit2/Shared/CoordinatedGraphics/threadedcompositor/ThreadedCompositor.cpp:301:72: error: no matching function for call to ‘WTF::ThreadCondition::wait(WTF::Lock&amp;)’
     m_initializeRunLoopCondition.wait(m_initializeRunLoopConditionMutex);
                                                                        ^
../../Source/WebKit2/Shared/CoordinatedGraphics/threadedcompositor/ThreadedCompositor.cpp:301:72: note: candidate is:
In file included from ../../Source/WTF/wtf/Threading.h:44:0,
                 from ../../Source/WebCore/platform/Timer.h:32,
                 from ../../Source/WebCore/platform/graphics/FontCache.h:34,
                 from ../../Source/WebCore/platform/graphics/freetype/FontPlatformData.h:29,
                 from ../../Source/WebCore/platform/graphics/FontPlatformData.h:27,
                 from ../../Source/WebCore/platform/graphics/Font.h:30,
                 from ../../Source/WebCore/platform/graphics/FontCascade.h:29,
                 from ../../Source/WebCore/platform/graphics/GraphicsContext.h:33,
                 from DerivedSources/ForwardingHeaders/WebCore/GraphicsContext.h:1,
                 from ../../Source/WebKit2/Shared/CoordinatedGraphics/CoordinatedGraphicsScene.h:27,
                 from ../../Source/WebKit2/Shared/CoordinatedGraphics/threadedcompositor/ThreadedCompositor.h:31,
                 from ../../Source/WebKit2/Shared/CoordinatedGraphics/threadedcompositor/ThreadedCompositor.cpp:29:
../../Source/WTF/wtf/ThreadingPrimitives.h:97:10: note: void WTF::ThreadCondition::wait(WTF::Mutex&amp;)
     WTF_EXPORT_PRIVATE void wait(Mutex&amp; mutex);
          ^
../../Source/WTF/wtf/ThreadingPrimitives.h:97:10: note:   no known conversion for argument 1 from ‘WTF::Lock’ to ‘WTF::Mutex&amp;’
../../Source/WebKit2/Shared/CoordinatedGraphics/threadedcompositor/ThreadedCompositor.cpp: In member function ‘void WebKit::ThreadedCompositor::terminateCompositingThread()’:
../../Source/WebKit2/Shared/CoordinatedGraphics/threadedcompositor/ThreadedCompositor.cpp:340:70: error: no matching function for call to ‘WTF::ThreadCondition::wait(WTF::Lock&amp;)’
     m_terminateRunLoopCondition.wait(m_terminateRunLoopConditionMutex);</pre>
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