/*

 * 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.

 */

#ifndef FileThread_h

#define FileThread_h

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

#include <wtf/MessageQueue.h>

#include <wtf/PassOwnPtr.h>

#include <wtf/PassRefPtr.h>

#include <wtf/Threading.h>

namespace WebCore {

class FileStream;

class FileThread : public ThreadSafeShared<FileThread> {

public:

    static PassRefPtr<FileThread> create() { return adoptRef(new FileThread()); }

    ~FileThread();

    bool start();

    void stop();

    class Task : public Noncopyable {

    public:

        virtual ~Task() { }

        virtual void performTask() = 0;

        FileStream* stream() const { return m_stream; }

    protected:

        Task(FileStream* stream) : m_stream(stream) { }

        FileStream* m_stream;

    };

    void postTask(PassOwnPtr<Task> task);

    void unscheduleTasks(const FileStream*);

private:

    FileThread();

    static void* fileThreadStart(void*);

    void* runLoop();

    ThreadIdentifier m_threadID;

    RefPtr<FileThread> m_selfRef;

    MessageQueue<Task> m_queue;

    Mutex m_threadCreationMutex;

};

} // namespace WebCore

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

#endif // FileThread_h