singleton_object_pool.h

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 * See the dyninst/COPYRIGHT file for copyright information.
 * 
 * We provide the Paradyn Tools (below described as "Paradyn")
 * on an AS IS basis, and do not warrant its validity or performance.
 * We reserve the right to update, modify, or discontinue this
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 * updates or modifications or any other form of support to you.
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 * other person or entity with proprietary rights in Paradyn) are
 * under no obligation to provide either maintenance services,
 * update services, notices of latent defects, or correction of
 * defects for Paradyn.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * 
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 */
#if !defined(SINGLETON_OBJECT_POOL_H)
#define SINGLETON_OBJECT_POOL_H

#define BOOST_POOL_NO_MT
#undef BOOST_HAS_THREADS

#include <boost/pool/pool.hpp>
#include "pool_allocators.h"

// This is only safe for objects with nothrow constructors...
template <typename T, typename Alloc = boost::default_user_allocator_new_delete>
class singleton_object_pool
{
 private:
 struct pool_impl
 {
   boost::pool<Alloc> p;
   pool_impl() : p(sizeof(T), 32) 
   {
   }
 };
 struct singleton
 {
    static pool_impl& instance()
    {
        static pool_impl* thePool = new pool_impl;
        return *thePool;
    }
 };
 
  
 inline static void free(T* free_me)
 {
   singleton::instance().p.free(free_me);
 }
 
 inline static T* malloc() 
  {
    return static_cast<T*>(singleton::instance().p.malloc());
  }
 public:
  inline static bool is_from(T* t)
  {
    return singleton::instance().p.is_from(t);
  }
  
  static T* construct()
  {
    T* const temp = malloc();
    if(temp == 0) return temp;
    new(temp) T();
    return temp;
  }
  template <typename A1>
  static T* construct(const A1& a1)
  {
    T* const temp = malloc();
    if(temp == 0) return temp;
    new(temp) T(a1);
    return temp;
  }
  template <typename A1, typename A2>
  static T* construct(const A1& a1, const A2& a2)
  {
    T* const temp = malloc();
    if(temp == 0) return temp;
    new(temp) T(a1, a2);
    return temp;
  }
  template <typename A1, typename A2, typename A3>
  static T* construct(const A1& a1, const A2& a2, const A3& a3)
  {
    T* const temp = malloc();
    if(temp == 0) return temp;
    new(temp) T(a1, a2, a3);
    return temp;
  }
  template <typename A1, typename A2, typename A3, typename A4>
  static T* construct(const A1& a1, const A2& a2, const A3& a3, const A4& a4)
  {
    T* const temp = malloc();
    if(temp == 0) return temp;
    new(temp) T(a1, a2, a3, a4);
    return temp;
  }
  template <typename A1, typename A2, typename A3, typename A4, typename A5>
  static T* construct(const A1& a1, const A2& a2, const A3& a3, const A4& a4, const A5& a5)
  {
    T* const temp = malloc();
    if(temp == 0) return temp;
    new(temp) T(a1, a2, a3, a4, a5);
    return temp;
  }
  inline static void destroy(T* const kill_me)
  {
    kill_me->~T();
    free(kill_me);
  }
  
  
};


template <typename T> 
struct PoolDestructor
{
  inline void operator()(T* e) 
  {
    // We'll see if this kills performance or not...
    if(singleton_object_pool<T>::is_from(e)) {
      singleton_object_pool<T>::destroy(e);
    }
    
  }
};

template <typename T> inline
boost::shared_ptr<T> make_shared(T* t)
{
    return boost::shared_ptr<T>(t, PoolDestructor<T>()/*, typename unlocked_fast_alloc<T>::type()*/);
}
 

#endif //!defined(SINGLETON_OBJECT_POOL_H)