Rename DatabaseTaskSynchronizer to TaskSynchronizer and move it to platform/

Source/platform/TaskSynchronizer.cpp

 /*
- * Copyright (C) 2012 Apple Inc. All rights reserved.
+ * Copyright (C) 2007, 2008, 2013 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
  *     documentation and/or other materials provided with the distribution.
  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
  *     its contributors may be used to endorse or promote products derived
  *     from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
-#include "core/accessibility/AXSVGRoot.h"
+#include "platform/TaskSynchronizer.h"
 
+#include "heap/Handle.h"
 
 namespace WebCore {
 
-AXSVGRoot::AXSVGRoot(RenderObject* renderer)

[tkent, 2014/03/13 07:43:51]

Git chose a wrong copy source.
We should land a CL to copy DatabaseTask.{cpp,h} to TaskSynchronizer.{cpp,h}
before this CL (TBR=tkent is ok), or
should try to "git cl upload --similarity=" with lower values.

-    : AXRenderObject(renderer)
-    , m_parent(0)
+TaskSynchronizer::TaskSynchronizer()
+    : m_taskCompleted(false)
+#ifndef NDEBUG
+    , m_hasCheckedForTermination(false)
+#endif
 {
 }
 
-AXSVGRoot::~AXSVGRoot()
+void TaskSynchronizer::waitForTaskCompletion()
 {
+    // Prevent the deadlock between park request by other threads and blocking
+    // by m_synchronousCondition.
+    ThreadState::SafePointScope scope(ThreadState::HeapPointersOnStack);
+    m_synchronousMutex.lock();
+    while (!m_taskCompleted)
+        m_synchronousCondition.wait(m_synchronousMutex);
+    m_synchronousMutex.unlock();
 }
 
-PassRefPtr<AXSVGRoot> AXSVGRoot::create(RenderObject* renderer)
+void TaskSynchronizer::taskCompleted()
 {
-    return adoptRef(new AXSVGRoot(renderer));
+    m_synchronousMutex.lock();
+    m_taskCompleted = true;
+    m_synchronousCondition.signal();
+    m_synchronousMutex.unlock();
 }
 
-AXObject* AXSVGRoot::parentObject() const
-{
-    // If a parent was set because this is a remote SVG resource, use that
-    // but otherwise, we should rely on the standard render tree for the parent.
-    if (m_parent)
-        return m_parent;
-
-    return AXRenderObject::parentObject();
-}
-
-
 } // namespace WebCore