src/third_party/WebKit/Source/core/html/parser/HTMLParserThread.cpp

   1 /*
   2  * Copyright (C) 2013 Google Inc.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are
   6  * met:
   7  *
   8  *     * Redistributions of source code must retain the above copyright
   9  * notice, this list of conditions and the following disclaimer.
  10  *     * Redistributions in binary form must reproduce the above
  11  * copyright notice, this list of conditions and the following disclaimer
  12  * in the documentation and/or other materials provided with the
  13  * distribution.
  14  *     * Neither the name of Google Inc. nor the names of its
  15  * contributors may be used to endorse or promote products derived from
  16  * this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 #include "config.h"
  32 #include "core/html/parser/HTMLParserThread.h"
  33
  34 #include "platform/Task.h"
  35 #include "platform/TaskSynchronizer.h"
  36 #include "public/platform/Platform.h"
  37 #include "wtf/PassOwnPtr.h"
  38
  39 namespace WebCore {
  40
  41 static HTMLParserThread* s_sharedThread = 0;
  42
  43 HTMLParserThread::HTMLParserThread()
  44 {
  45 }
  46
  47 HTMLParserThread::~HTMLParserThread()
  48 {
  49 }
  50
  51 void HTMLParserThread::init()
  52 {
  53     ASSERT(!s_sharedThread);
  54     s_sharedThread = new HTMLParserThread;
  55 }
  56
  57 void HTMLParserThread::setupHTMLParserThread()
  58 {
  59     m_pendingGCRunner = adoptPtr(new PendingGCRunner);
  60     m_messageLoopInterruptor = adoptPtr(new MessageLoopInterruptor(&platformThread()));
  61     platformThread().addTaskObserver(m_pendingGCRunner.get());
  62     ThreadState::attach();
  63     ThreadState::current()->addInterruptor(m_messageLoopInterruptor.get());
  64 }
  65
  66 void HTMLParserThread::shutdown()
  67 {
  68     ASSERT(s_sharedThread);
  69     // currentThread will always be non-null in production, but can be null in Chromium unit tests.
  70     if (blink::Platform::current()->currentThread() && s_sharedThread->isRunning()) {
  71         TaskSynchronizer taskSynchronizer;
  72         s_sharedThread->postTask(WTF::bind(&HTMLParserThread::cleanupHTMLParserThread, s_sharedThread, &taskSynchronizer));
  73         taskSynchronizer.waitForTaskCompletion();
  74     }
  75     delete s_sharedThread;
  76     s_sharedThread = 0;
  77 }
  78
  79 void HTMLParserThread::cleanupHTMLParserThread(TaskSynchronizer* taskSynchronizer)
  80 {
  81     ThreadState::current()->removeInterruptor(m_messageLoopInterruptor.get());
  82     ThreadState::detach();
  83     platformThread().removeTaskObserver(m_pendingGCRunner.get());
  84     m_pendingGCRunner = nullptr;
  85     m_messageLoopInterruptor = nullptr;
  86     taskSynchronizer->taskCompleted();
  87 }
  88
  89 HTMLParserThread* HTMLParserThread::shared()
  90 {
  91     return s_sharedThread;
  92 }
  93
  94 blink::WebThread& HTMLParserThread::platformThread()
  95 {
  96     if (!isRunning()) {
  97         m_thread = adoptPtr(blink::Platform::current()->createThread("HTMLParserThread"));
  98         postTask(WTF::bind(&HTMLParserThread::setupHTMLParserThread, this));
  99     }
 100     return *m_thread;
 101 }
 102
 103 bool HTMLParserThread::isRunning()
 104 {
 105     return !!m_thread;
 106 }
 107
 108 void HTMLParserThread::postTask(const Closure& closure)
 109 {
 110     platformThread().postTask(new Task(closure));
 111 }
 112
 113 } // namespace WebCore