/*

 * Copyright (C) 2010 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,

 * 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"

#if ENABLE(FILE_WRITER) || ENABLE(FILE_READER)

#include "FileThread.h"

#include "AutodrainedPool.h"

#include "Logging.h"

namespace WebCore {

FileThread::FileThread()

    : m_threadID(0)

{

    m_selfRef = this;

}

FileThread::~FileThread()

{

    ASSERT(m_queue.killed());

}

bool FileThread::start()

{

    MutexLocker lock(m_threadCreationMutex);

    if (m_threadID)

        return true;

    m_threadID = createThread(FileThread::fileThreadStart, this, "WebCore: File");

    return m_threadID;

}

void FileThread::stop()

{

    return m_queue.kill();

}

void FileThread::postTask(PassOwnPtr<Task> task)

{

    m_queue.append(task);

}

class SameFilePredicate {

public:

    SameFilePredicate(const FileStream* stream) : m_stream(stream) { }

    bool operator()(FileThread::Task* task) const { return task->stream() == m_stream; }

private:

    const FileStream* m_stream;

};

void FileThread::unscheduleTasks(const FileStream* stream)

{

    SameFilePredicate predicate(stream);

    m_queue.removeIf(predicate);

}

void* FileThread::fileThreadStart(void* arg)

{

    FileThread* fileThread = static_cast<FileThread*>(arg);

    return fileThread->runLoop();

}

void* FileThread::runLoop()

{

    {

        // Wait for FileThread::start() to complete to have m_threadID

        // established before starting the main loop.

        MutexLocker lock(m_threadCreationMutex);

        LOG(FileAPI, "Started FileThread %p", this);

    }

    AutodrainedPool pool;

    while (OwnPtr<Task> task = m_queue.waitForMessage()) {

        task->performTask();

        pool.cycle();

    }

    LOG(FileAPI, "About to detach thread %i and clear the ref to FileThread %p, which currently has %i ref(s)", m_threadID, this, refCount());

    detachThread(m_threadID);

    // Clear the self refptr, possibly resulting in deletion

    m_selfRef = 0;

    return 0;

}

} // namespace WebCore

#endif // ENABLE(FILE_WRITER) || ENABLE(FILE_READER)