// Copyright (C) 2000, 2001 Stephen Cleary

//

// Distributed under the Boost Software License, Version 1.0. (See

// accompanying file LICENSE_1_0.txt or copy at

// http://www.boost.org/LICENSE_1_0.txt)

//

// See http://www.boost.org for updates, documentation, and revision history.

#ifndef BOOST_SINGLETON_POOL_HPP

#define BOOST_SINGLETON_POOL_HPP

#include <boost/pool/poolfwd.hpp>

// boost::pool

#include <boost/pool/pool.hpp>

// boost::details::pool::singleton_default

#include <boost/pool/detail/singleton.hpp>

// boost::details::pool::guard

#include <boost/pool/detail/guard.hpp>

namespace boost {

//

// The singleton_pool class allows other pool interfaces for types of the same

//   size to share the same pool

//

template <typename Tag, unsigned RequestedSize,

    typename UserAllocator,

    typename Mutex,

    unsigned NextSize>

struct singleton_pool

{

  public:

    typedef Tag tag;

    typedef Mutex mutex;

    typedef UserAllocator user_allocator;

    typedef typename pool<UserAllocator>::size_type size_type;

    typedef typename pool<UserAllocator>::difference_type difference_type;

    BOOST_STATIC_CONSTANT(unsigned, requested_size = RequestedSize);

    BOOST_STATIC_CONSTANT(unsigned, next_size = NextSize);

  private:

    struct pool_type: Mutex

    {

      pool<UserAllocator> p;

      pool_type():p(RequestedSize, NextSize) { }

    };

    typedef details::pool::singleton_default<pool_type> singleton;

    singleton_pool();

  public:

    static void * malloc()

    {

      pool_type & p = singleton::instance();

      details::pool::guard<Mutex> g(p);

      return p.p.malloc();

    }

    static void * ordered_malloc()

    {

      pool_type & p = singleton::instance();

      details::pool::guard<Mutex> g(p);

      return p.p.ordered_malloc();

    }

    static void * ordered_malloc(const size_type n)

    {

      pool_type & p = singleton::instance();

      details::pool::guard<Mutex> g(p);

      return p.p.ordered_malloc(n);

    }

    static bool is_from(void * const ptr)

    {

      pool_type & p = singleton::instance();

      details::pool::guard<Mutex> g(p);

      return p.p.is_from(ptr);

    }

    static void free(void * const ptr)

    {

      pool_type & p = singleton::instance();

      details::pool::guard<Mutex> g(p);

      p.p.free(ptr);

    }

    static void ordered_free(void * const ptr)

    {

      pool_type & p = singleton::instance();

      details::pool::guard<Mutex> g(p);

      p.p.ordered_free(ptr);

    }

    static void free(void * const ptr, const size_type n)

    {

      pool_type & p = singleton::instance();

      details::pool::guard<Mutex> g(p);

      p.p.free(ptr, n);

    }

    static void ordered_free(void * const ptr, const size_type n)

    {

      pool_type & p = singleton::instance();

      details::pool::guard<Mutex> g(p);

      p.p.ordered_free(ptr, n);

    }

    static bool release_memory()

    {

      pool_type & p = singleton::instance();

      details::pool::guard<Mutex> g(p);

      return p.p.release_memory();

    }

    static bool purge_memory()

    {

      pool_type & p = singleton::instance();

      details::pool::guard<Mutex> g(p);

      return p.p.purge_memory();

    }

};

} // namespace boost

#endif