/*

 * Copyright (C) 2008 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.

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 COMPUTER, INC. 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 ThreadGlobalData_h

#define ThreadGlobalData_h

#include "StringHash.h"

#include <wtf/HashMap.h>

#include <wtf/HashSet.h>

#include <wtf/Noncopyable.h>

#if ENABLE(WORKERS)

#include <wtf/ThreadSpecific.h>

#include <wtf/Threading.h>

using WTF::ThreadSpecific;

#endif

namespace WebCore {

    class EventNames;

    struct ICUConverterWrapper;

    struct TECConverterWrapper;

    class ThreadTimers;

    class ThreadGlobalData : public Noncopyable {

    public:

        ThreadGlobalData();

        ~ThreadGlobalData();

        void destroy(); // called on workers to clean up the ThreadGlobalData before the thread exits.

        EventNames& eventNames() { return *m_eventNames; }

        ThreadTimers& threadTimers() { return *m_threadTimers; }

#if USE(ICU_UNICODE)

        ICUConverterWrapper& cachedConverterICU() { return *m_cachedConverterICU; }

#endif

#if PLATFORM(MAC)

        TECConverterWrapper& cachedConverterTEC() { return *m_cachedConverterTEC; }

#endif

    private:

        EventNames* m_eventNames;

        ThreadTimers* m_threadTimers;

#ifndef NDEBUG

        bool m_isMainThread;

#endif

#if USE(ICU_UNICODE)

        ICUConverterWrapper* m_cachedConverterICU;

#endif

#if PLATFORM(MAC)

        TECConverterWrapper* m_cachedConverterTEC;

#endif

#if ENABLE(WORKERS)

        static ThreadSpecific<ThreadGlobalData>* staticData;

#else

        static ThreadGlobalData* staticData;

#endif

        friend ThreadGlobalData& threadGlobalData();

    };

inline ThreadGlobalData& threadGlobalData() 

{

    // FIXME: Workers are not necessarily the only feature that make per-thread global data necessary.

    // We need to check for e.g. database objects manipulating strings on secondary threads.

#if ENABLE(WORKERS)

    // ThreadGlobalData is used on main thread before it could possibly be used on secondary ones, so there is no need for synchronization here.

    if (!ThreadGlobalData::staticData)

        ThreadGlobalData::staticData = new ThreadSpecific<ThreadGlobalData>;

    return **ThreadGlobalData::staticData;

#else

    if (!ThreadGlobalData::staticData) {

        ThreadGlobalData::staticData = static_cast<ThreadGlobalData*>(fastMalloc(sizeof(ThreadGlobalData)));

        // ThreadGlobalData constructor indirectly uses staticData, so we need to set up the memory before invoking it.

        new (ThreadGlobalData::staticData) ThreadGlobalData;

    }

    return *ThreadGlobalData::staticData;

#endif

}

} // namespace WebCore

#endif // ThreadGlobalData_h