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boost_container/include/boost/container/adaptive_pool.hpp
Ion Gaztañaga 27f99047a8 Documentaion macros in adaptive_pool
2014-09-20 17:29:26 +02:00

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//////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2005-2013. 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/libs/container for documentation.
//
//////////////////////////////////////////////////////////////////////////////
#ifndef BOOST_CONTAINER_ADAPTIVE_POOL_HPP
#define BOOST_CONTAINER_ADAPTIVE_POOL_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif
#include <boost/container/detail/config_begin.hpp>
#include <boost/container/detail/workaround.hpp>
#include <boost/container/container_fwd.hpp>
#include <boost/container/detail/version_type.hpp>
#include <boost/container/throw_exception.hpp>
#include <boost/container/detail/adaptive_node_pool.hpp>
#include <boost/container/detail/multiallocation_chain.hpp>
#include <boost/container/detail/mpl.hpp>
#include <boost/container/detail/alloc_lib_auto_link.hpp>
#include <boost/container/detail/singleton.hpp>
#include <boost/assert.hpp>
#include <boost/utility/addressof.hpp>
#include <boost/static_assert.hpp>
#include <boost/move/move.hpp>
#include <memory>
#include <algorithm>
#include <cstddef>
#include <new>
namespace boost {
namespace container {
//!An STL node allocator that uses a modified DLMalloc as memory
//!source.
//!
//!This node allocator shares a segregated storage between all instances
//!of adaptive_pool with equal sizeof(T).
//!
//!NodesPerBlock is the number of nodes allocated at once when the allocator
//!needs runs out of nodes. MaxFreeBlocks is the maximum number of totally free blocks
//!that the adaptive node pool will hold. The rest of the totally free blocks will be
//!deallocated to the memory manager.
//!
//!OverheadPercent is the (approximated) maximum size overhead (1-20%) of the allocator:
//!(memory usable for nodes / total memory allocated from the memory allocator)
template < class T
, std::size_t NodesPerBlock BOOST_CONTAINER_DOCONLY(= ADP_nodes_per_block)
, std::size_t MaxFreeBlocks BOOST_CONTAINER_DOCONLY(= ADP_max_free_blocks)
, std::size_t OverheadPercent BOOST_CONTAINER_DOCONLY(= ADP_overhead_percent)
BOOST_CONTAINER_DOCIGN(BOOST_CONTAINER_I unsigned Version)
>
class adaptive_pool
{
//!If Version is 1, the allocator is a STL conforming allocator. If Version is 2,
//!the allocator offers advanced expand in place and burst allocation capabilities.
public:
typedef unsigned int allocation_type;
typedef adaptive_pool
<T, NodesPerBlock, MaxFreeBlocks, OverheadPercent
BOOST_CONTAINER_DOCIGN(BOOST_CONTAINER_I Version)
> self_t;
static const std::size_t nodes_per_block = NodesPerBlock;
static const std::size_t max_free_blocks = MaxFreeBlocks;
static const std::size_t overhead_percent = OverheadPercent;
static const std::size_t real_nodes_per_block = NodesPerBlock;
BOOST_CONTAINER_DOCIGN(BOOST_STATIC_ASSERT((Version <=2)));
public:
//-------
typedef T value_type;
typedef T * pointer;
typedef const T * const_pointer;
typedef typename ::boost::container::
container_detail::unvoid<T>::type & reference;
typedef const typename ::boost::container::
container_detail::unvoid<T>::type & const_reference;
typedef std::size_t size_type;
typedef std::ptrdiff_t difference_type;
typedef boost::container::container_detail::
version_type<self_t, Version> version;
#ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
typedef boost::container::container_detail::
basic_multiallocation_chain<void*> multiallocation_chain_void;
typedef boost::container::container_detail::
transform_multiallocation_chain
<multiallocation_chain_void, T> multiallocation_chain;
#endif //#ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
//!Obtains adaptive_pool from
//!adaptive_pool
template<class T2>
struct rebind
{
typedef adaptive_pool
< T2
, NodesPerBlock
, MaxFreeBlocks
, OverheadPercent
BOOST_CONTAINER_DOCIGN(BOOST_CONTAINER_I Version)
> other;
};
#ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
private:
//!Not assignable from related adaptive_pool
template<class T2, unsigned Version2, std::size_t N2, std::size_t F2>
adaptive_pool& operator=
(const adaptive_pool<T2, Version2, N2, F2>&);
//!Not assignable from other adaptive_pool
adaptive_pool& operator=(const adaptive_pool&);
#endif //#ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
public:
//!Default constructor
adaptive_pool() BOOST_CONTAINER_NOEXCEPT
{}
//!Copy constructor from other adaptive_pool.
adaptive_pool(const adaptive_pool &) BOOST_CONTAINER_NOEXCEPT
{}
//!Copy constructor from related adaptive_pool.
template<class T2>
adaptive_pool
(const adaptive_pool<T2, NodesPerBlock, MaxFreeBlocks, OverheadPercent
BOOST_CONTAINER_DOCIGN(BOOST_CONTAINER_I Version)> &) BOOST_CONTAINER_NOEXCEPT
{}
//!Destructor
~adaptive_pool() BOOST_CONTAINER_NOEXCEPT
{}
//!Returns the number of elements that could be allocated.
//!Never throws
size_type max_size() const BOOST_CONTAINER_NOEXCEPT
{ return size_type(-1)/sizeof(T); }
//!Allocate memory for an array of count elements.
//!Throws std::bad_alloc if there is no enough memory
pointer allocate(size_type count, const void * = 0)
{
if(count > this->max_size())
boost::container::throw_bad_alloc();
if(Version == 1 && count == 1){
typedef typename container_detail::shared_adaptive_node_pool
<sizeof(T), NodesPerBlock, MaxFreeBlocks, OverheadPercent> shared_pool_t;
typedef container_detail::singleton_default<shared_pool_t> singleton_t;
return pointer(static_cast<T*>(singleton_t::instance().allocate_node()));
}
else{
return static_cast<pointer>(boost_cont_malloc(count*sizeof(T)));
}
}
//!Deallocate allocated memory.
//!Never throws
void deallocate(const pointer &ptr, size_type count) BOOST_CONTAINER_NOEXCEPT
{
(void)count;
if(Version == 1 && count == 1){
typedef container_detail::shared_adaptive_node_pool
<sizeof(T), NodesPerBlock, MaxFreeBlocks, OverheadPercent> shared_pool_t;
typedef container_detail::singleton_default<shared_pool_t> singleton_t;
singleton_t::instance().deallocate_node(ptr);
}
else{
boost_cont_free(ptr);
}
}
std::pair<pointer, bool>
allocation_command(allocation_type command,
size_type limit_size,
size_type preferred_size,
size_type &received_size, pointer reuse = pointer())
{
std::pair<pointer, bool> ret =
this->priv_allocation_command(command, limit_size, preferred_size, received_size, reuse);
if(!ret.first && !(command & BOOST_CONTAINER_NOTHROW_ALLOCATION))
boost::container::throw_bad_alloc();
return ret;
}
//!Returns maximum the number of objects the previously allocated memory
//!pointed by p can hold.
size_type size(pointer p) const BOOST_CONTAINER_NOEXCEPT
{ return boost_cont_size(p); }
//!Allocates just one object. Memory allocated with this function
//!must be deallocated only with deallocate_one().
//!Throws bad_alloc if there is no enough memory
pointer allocate_one()
{
typedef container_detail::shared_adaptive_node_pool
<sizeof(T), NodesPerBlock, MaxFreeBlocks, OverheadPercent> shared_pool_t;
typedef container_detail::singleton_default<shared_pool_t> singleton_t;
return (pointer)singleton_t::instance().allocate_node();
}
//!Allocates many elements of size == 1.
//!Elements must be individually deallocated with deallocate_one()
void allocate_individual(std::size_t num_elements, multiallocation_chain &chain)
{
typedef container_detail::shared_adaptive_node_pool
<sizeof(T), NodesPerBlock, MaxFreeBlocks, OverheadPercent> shared_pool_t;
typedef container_detail::singleton_default<shared_pool_t> singleton_t;
singleton_t::instance().allocate_nodes(num_elements, static_cast<typename shared_pool_t::multiallocation_chain&>(chain));
//typename shared_pool_t::multiallocation_chain ch;
//singleton_t::instance().allocate_nodes(num_elements, ch);
//chain.incorporate_after
//(chain.before_begin(), (T*)&*ch.begin(), (T*)&*ch.last(), ch.size());
}
//!Deallocates memory previously allocated with allocate_one().
//!You should never use deallocate_one to deallocate memory allocated
//!with other functions different from allocate_one(). Never throws
void deallocate_one(pointer p) BOOST_CONTAINER_NOEXCEPT
{
typedef container_detail::shared_adaptive_node_pool
<sizeof(T), NodesPerBlock, MaxFreeBlocks, OverheadPercent> shared_pool_t;
typedef container_detail::singleton_default<shared_pool_t> singleton_t;
singleton_t::instance().deallocate_node(p);
}
void deallocate_individual(multiallocation_chain &chain) BOOST_CONTAINER_NOEXCEPT
{
typedef container_detail::shared_adaptive_node_pool
<sizeof(T), NodesPerBlock, MaxFreeBlocks, OverheadPercent> shared_pool_t;
typedef container_detail::singleton_default<shared_pool_t> singleton_t;
//typename shared_pool_t::multiallocation_chain ch(&*chain.begin(), &*chain.last(), chain.size());
//singleton_t::instance().deallocate_nodes(ch);
singleton_t::instance().deallocate_nodes(chain);
}
//!Allocates many elements of size elem_size.
//!Elements must be individually deallocated with deallocate()
void allocate_many(size_type elem_size, std::size_t n_elements, multiallocation_chain &chain)
{
BOOST_STATIC_ASSERT(( Version > 1 ));/*
boost_cont_memchain ch;
BOOST_CONTAINER_MEMCHAIN_INIT(&ch);
if(!boost_cont_multialloc_nodes(n_elements, elem_size*sizeof(T), DL_MULTIALLOC_DEFAULT_CONTIGUOUS, &ch)){
boost::container::throw_bad_alloc();
}
chain.incorporate_after(chain.before_begin()
,(T*)BOOST_CONTAINER_MEMCHAIN_FIRSTMEM(&ch)
,(T*)BOOST_CONTAINER_MEMCHAIN_LASTMEM(&ch)
,BOOST_CONTAINER_MEMCHAIN_SIZE(&ch) );*/
if(!boost_cont_multialloc_nodes(n_elements, elem_size*sizeof(T), DL_MULTIALLOC_DEFAULT_CONTIGUOUS, reinterpret_cast<boost_cont_memchain *>(&chain))){
boost::container::throw_bad_alloc();
}
}
//!Allocates n_elements elements, each one of size elem_sizes[i]
//!Elements must be individually deallocated with deallocate()
void allocate_many(const size_type *elem_sizes, size_type n_elements, multiallocation_chain &chain)
{
BOOST_STATIC_ASSERT(( Version > 1 ));/*
boost_cont_memchain ch;
BOOST_CONTAINER_MEMCHAIN_INIT(&ch);
if(!boost_cont_multialloc_arrays(n_elements, elem_sizes, sizeof(T), DL_MULTIALLOC_DEFAULT_CONTIGUOUS, &ch)){
boost::container::throw_bad_alloc();
}
chain.incorporate_after(chain.before_begin()
,(T*)BOOST_CONTAINER_MEMCHAIN_FIRSTMEM(&ch)
,(T*)BOOST_CONTAINER_MEMCHAIN_LASTMEM(&ch)
,BOOST_CONTAINER_MEMCHAIN_SIZE(&ch) );*/
if(!boost_cont_multialloc_arrays(n_elements, elem_sizes, sizeof(T), DL_MULTIALLOC_DEFAULT_CONTIGUOUS, reinterpret_cast<boost_cont_memchain *>(&chain))){
boost::container::throw_bad_alloc();
}
}
void deallocate_many(multiallocation_chain &chain) BOOST_CONTAINER_NOEXCEPT
{/*
boost_cont_memchain ch;
void *beg(&*chain.begin()), *last(&*chain.last());
size_t size(chain.size());
BOOST_CONTAINER_MEMCHAIN_INIT_FROM(&ch, beg, last, size);
boost_cont_multidealloc(&ch);*/
boost_cont_multidealloc(reinterpret_cast<boost_cont_memchain *>(&chain));
}
//!Deallocates all free blocks of the pool
static void deallocate_free_blocks() BOOST_CONTAINER_NOEXCEPT
{
typedef container_detail::shared_adaptive_node_pool
<sizeof(T), NodesPerBlock, MaxFreeBlocks, OverheadPercent> shared_pool_t;
typedef container_detail::singleton_default<shared_pool_t> singleton_t;
singleton_t::instance().deallocate_free_blocks();
}
//!Swaps allocators. Does not throw. If each allocator is placed in a
//!different memory segment, the result is undefined.
friend void swap(adaptive_pool &, adaptive_pool &) BOOST_CONTAINER_NOEXCEPT
{}
//!An allocator always compares to true, as memory allocated with one
//!instance can be deallocated by another instance
friend bool operator==(const adaptive_pool &, const adaptive_pool &) BOOST_CONTAINER_NOEXCEPT
{ return true; }
//!An allocator always compares to false, as memory allocated with one
//!instance can be deallocated by another instance
friend bool operator!=(const adaptive_pool &, const adaptive_pool &) BOOST_CONTAINER_NOEXCEPT
{ return false; }
private:
std::pair<pointer, bool> priv_allocation_command
(allocation_type command, std::size_t limit_size
,std::size_t preferred_size,std::size_t &received_size, void *reuse_ptr)
{
boost_cont_command_ret_t ret = {0 , 0};
if(limit_size > this->max_size() || preferred_size > this->max_size()){
// ret.first = 0;
return std::pair<pointer, bool>(pointer(), false);
}
std::size_t l_size = limit_size*sizeof(T);
std::size_t p_size = preferred_size*sizeof(T);
std::size_t r_size;
{
ret = boost_cont_allocation_command(command, sizeof(T), l_size, p_size, &r_size, reuse_ptr);
}
received_size = r_size/sizeof(T);
return std::pair<pointer, bool>(static_cast<pointer>(ret.first), !!ret.second);
}
};
} //namespace container {
} //namespace boost {
#include <boost/container/detail/config_end.hpp>
#endif //#ifndef BOOST_CONTAINER_ADAPTIVE_POOL_HPP
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