ThreadLocal.h

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/* ES40 emulator.
 * Copyright (C) 2007-2008 by the ES40 Emulator Project
 *
 * WWW    : http://sourceforge.net/projects/es40
 * E-mail : camiel@camicom.com
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 * 
 * Although this is not required, the author would appreciate being notified of, 
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 */

//
// ThreadLocal.h
//
// $Id: ThreadLocal.h,v 1.1 2008/03/31 19:13:34 iamcamiel Exp $
//
// Library: Foundation
// Package: Threading
// Module:  Thread
//
// Definition of the ThreadLocal template and related classes.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


#ifndef Foundation_ThreadLocal_INCLUDED
#define Foundation_ThreadLocal_INCLUDED


#include "VMS/Foundation.h"
#include <map>


namespace Poco {


class Foundation_API TLSAbstractSlot
{
public:
        TLSAbstractSlot();
        virtual ~TLSAbstractSlot();
};


template <class C>
class TLSSlot: public TLSAbstractSlot
{
public:
        TLSSlot():
                _value()
        {
        }
        
        ~TLSSlot()
        {
        }
        
        C& value()
        {
                return _value;
        }
        
private:
        TLSSlot(const TLSSlot&);
        TLSSlot& operator = (const TLSSlot&);

        C _value;
};


class Foundation_API ThreadLocalStorage
{
public:
        ThreadLocalStorage();
                
        ~ThreadLocalStorage();

        TLSAbstractSlot*& get(const void* key);
                
        static ThreadLocalStorage& current();
                
        static void clear();
        
private:
        typedef std::map<const void*, TLSAbstractSlot*> TLSMap;
        
        TLSMap _map;

        friend class Thread;
};


template <class C>
class ThreadLocal
{
        typedef TLSSlot<C> Slot;

public:
        ThreadLocal()
        {
        }
        
        ~ThreadLocal()
        {
        }
        
        C* operator -> ()
        {
                return &get();
        }
        
        C& operator * ()
        {
                return get();
        }

        C& get()
        {
                TLSAbstractSlot*& p = ThreadLocalStorage::current().get(this);
                if (!p) p = new Slot;
                return static_cast<Slot*>(p)->value();
        }
        
private:
        ThreadLocal(const ThreadLocal&);
        ThreadLocal& operator = (const ThreadLocal&);
};


} // namespace Poco


#endif // Foundation_ThreadLocal_INCLUDED

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