root/Source/core/html/parser/HTMLParserThread.cpp

DEFINITIONS

1. init
2. setupHTMLParserThread
3. shutdown
4. cleanupHTMLParserThread
5. shared
6. platformThread
7. postTask

/*
 * Copyright (C) 2013 Google 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:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
 * OWNER OR 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,
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#include "config.h"
#include "core/html/parser/HTMLParserThread.h"

#include "platform/Task.h"
#include "platform/TaskSynchronizer.h"
#include "public/platform/Platform.h"
#include "wtf/PassOwnPtr.h"

namespace WebCore {

static HTMLParserThread* s_sharedThread = 0;

HTMLParserThread::HTMLParserThread()
{
}

HTMLParserThread::~HTMLParserThread()
{
}

void HTMLParserThread::init()
{
    ASSERT(!s_sharedThread);
    s_sharedThread = new HTMLParserThread;
}

void HTMLParserThread::setupHTMLParserThread()
{
    m_pendingGCRunner = adoptPtr(new PendingGCRunner);
    m_messageLoopInterruptor = adoptPtr(new MessageLoopInterruptor(&platformThread()));
    platformThread().addTaskObserver(m_pendingGCRunner.get());
    ThreadState::attach();
    ThreadState::current()->addInterruptor(m_messageLoopInterruptor.get());
}

void HTMLParserThread::shutdown()
{
    ASSERT(s_sharedThread);
    // currentThread will always be non-null in production, but can be null in Chromium unit tests.
    if (blink::Platform::current()->currentThread()) {
        TaskSynchronizer taskSynchronizer;
        s_sharedThread->postTask(WTF::bind(&HTMLParserThread::cleanupHTMLParserThread, s_sharedThread, &taskSynchronizer));
        taskSynchronizer.waitForTaskCompletion();
    }
    delete s_sharedThread;
    s_sharedThread = 0;
}

void HTMLParserThread::cleanupHTMLParserThread(TaskSynchronizer* taskSynchronizer)
{
    ThreadState::current()->removeInterruptor(m_messageLoopInterruptor.get());
    ThreadState::detach();
    platformThread().removeTaskObserver(m_pendingGCRunner.get());
    m_pendingGCRunner = nullptr;
    m_messageLoopInterruptor = nullptr;
    taskSynchronizer->taskCompleted();
}

HTMLParserThread* HTMLParserThread::shared()
{
    return s_sharedThread;
}

blink::WebThread& HTMLParserThread::platformThread()
{
    if (!m_thread) {
        m_thread = adoptPtr(blink::Platform::current()->createThread("HTMLParserThread"));
        postTask(WTF::bind(&HTMLParserThread::setupHTMLParserThread, this));
    }
    return *m_thread;
}

void HTMLParserThread::postTask(const Closure& closure)
{
    platformThread().postTask(new Task(closure));
}

} // namespace WebCore