ThreadLocalStorage.h

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#ifndef __LDK_THREADLOCALSTORAGE_H__
#define __LDK_THREADLOCALSTORAGE_H__

//   Copyright (C) 2003-2006 Lorien Dunn.
//
//   Contact: loriendunn AT users DOT sourceforge DOT net
//
//   This software is provided 'as-is', without any express or implied warranty.
//   In no event will the authors be held liable for any damages arising from
//   the use of this software.
//
//   Permission is granted to anyone to use this software for any purpose,
//   including commercial applications, and to alter it and redistribute it
//   freely, subject to the following restrictions:
//
//   1. The origin of this software must not be misrepresented; you must not
//   claim that you wrote the original software. If you use this software in a
//   product, an acknowledgment in the product documentation would be
//   appreciated but is not required.
//
//   2. Altered source versions must be plainly marked as such, and must not be
//   misrepresented as being the original software.
//
//   3. This notice may not be removed or altered from any source distribution.
//

#include "LDK/API.h"
#include "LDK/Types.h"
extern "C"
{

typedef void (*ThreadLocalDtor) (void*);

typedef size_t TLSKey;

LDK_TLS_API TLSKey threadLocalCreateKey(ThreadLocalDtor dtor=NULL);

LDK_TLS_API void threadLocalSet(TLSKey key, void* object);

LDK_TLS_API void* threadLocalGet(TLSKey key);

}//etxern "C"

template <typename T>
class ThreadLocal
{
protected:

    void *mPtr;
    TLSKey mKey;
    static void tlsdtor(void* self) { if(self) delete reinterpret_cast<T*>(self); }

public:

    ThreadLocal()
    {
        mKey = threadLocalCreateKey(tlsdtor);
    }

    T* operator->()
    {
        T* tlsd = reinterpret_cast<T*>(threadLocalGet(mKey));
        if(!tlsd)
        {
            tlsd = new T();
            threadLocalSet(mKey,tlsd);
        }
        return tlsd;
    }

    T& operator&()
    {
        T* tlsd = reinterpret_cast<T*>(threadLocalGet(mKey));
        if(!tlsd)
        {
            tlsd = new T();
            threadLocalSet(mKey,tlsd);
        }
        return *tlsd;
    }
};


#endif //__LDK_THREADLOCALSTORAGE_H__

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