Source/core/platform/ThreadGlobalData.h

/*
 * 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 "wtf/HashMap.h"
#include "wtf/HashSet.h"
#include "wtf/Noncopyable.h"
#include "wtf/OwnPtr.h"
#include "wtf/PassOwnPtr.h"
#include "wtf/ThreadSpecific.h"
#include "wtf/Threading.h"
#include "wtf/text/StringHash.h"

using WTF::ThreadSpecific;

namespace WebCore {

    class EventNames;
    class ThreadLocalInspectorCounters;
    class ThreadTimers;

    struct TECConverterWrapper;

    class ThreadGlobalData {
        WTF_MAKE_NONCOPYABLE(ThreadGlobalData);
    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; }

        ThreadLocalInspectorCounters& inspectorCounters() { return *m_inspectorCounters; }

    private:
        OwnPtr<EventNames> m_eventNames;
        OwnPtr<ThreadTimers> m_threadTimers;

#ifndef NDEBUG
        bool m_isMainThread;
#endif

        OwnPtr<ThreadLocalInspectorCounters> m_inspectorCounters;

        static ThreadSpecific<ThreadGlobalData>* staticData;
        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.

    // 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;
}

} // namespace WebCore

#endif // ThreadGlobalData_h