lock_free_stack.h

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/** @file
 *  @author Bram de Greve (bramz@users.sourceforge.net)
 *  @author Tom De Muer (tomdemuer@users.sourceforge.net)
 *
 *  *** BEGIN LICENSE INFORMATION ***
 *  
 *  The contents of this file are subject to the Common Public Attribution License 
 *  Version 1.0 (the "License"); you may not use this file except in compliance with 
 *  the License. You may obtain a copy of the License at 
 *  http://lass.sourceforge.net/cpal-license. The License is based on the 
 *  Mozilla Public License Version 1.1 but Sections 14 and 15 have been added to cover 
 *  use of software over a computer network and provide for limited attribution for 
 *  the Original Developer. In addition, Exhibit A has been modified to be consistent 
 *  with Exhibit B.
 *  
 *  Software distributed under the License is distributed on an "AS IS" basis, WITHOUT 
 *  WARRANTY OF ANY KIND, either express or implied. See the License for the specific 
 *  language governing rights and limitations under the License.
 *  
 *  The Original Code is LASS - Library of Assembled Shared Sources.
 *  
 *  The Initial Developer of the Original Code is Bram de Greve and Tom De Muer.
 *  The Original Developer is the Initial Developer.
 *  
 *  All portions of the code written by the Initial Developer are:
 *  Copyright (C) 2004-2007 the Initial Developer.
 *  All Rights Reserved.
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 *
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 *  GNU General Public License Version 2 or later (the GPL), in which case the 
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 *  of your version of this file only under the terms of the GPL and not to allow 
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 *  deleting the provisions above and replace them with the notice and other 
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 */

#ifndef LASS_GUARDIAN_OF_INCLUSION_STDE_LOCK_FREE_STACK_H
#define LASS_GUARDIAN_OF_INCLUSION_STDE_LOCK_FREE_STACK_H

#include "stde_common.h"
#include "../util/allocator.h"

namespace lass
{
namespace util
{

// NOT TESTED YET!!!!

template 
<
    typename T, 
    typename FixedAllocator = AllocatorFixed<AllocatorMalloc>
>
class lock_free_stack: private util::AllocatorConcurrentFreeList<FixedAllocator>
{
public:

    typedef T value_type;

    lock_free_stack();
    ~lock_free_stack();

    void push(const value_type& x);
    bool pop(value_type& x);
    bool pop_swap(value_type& x);

private:

    struct node_t
    {
        node_t* next;
        value_type value;
    };
    
    typedef util::TaggedPtr<node_t> pointer_t;
    
    lock_free_stack(const lock_free_stack&);
    lock_free_stack& operator=(const lock_free_stack&);

    node_t* const make_node(const value_type& x);
    void free_node(node_t* node);
    void push_node(node_t* node);
    node_t* const pop_node();

    volatile pointer_t top_;
};

}

}

#include "lock_free_stack.inl"

#endif

// EOF