boost/interprocess/allocators/cached_node_allocator.hpp
//////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2005-2012. 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/interprocess for documentation.
//
//////////////////////////////////////////////////////////////////////////////
#ifndef BOOST_INTERPROCESS_CACHED_NODE_ALLOCATOR_HPP
#define BOOST_INTERPROCESS_CACHED_NODE_ALLOCATOR_HPP
#if (defined _MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif
#include <boost/interprocess/detail/config_begin.hpp>
#include <boost/interprocess/detail/workaround.hpp>
#include <boost/interprocess/interprocess_fwd.hpp>
#include <boost/interprocess/allocators/detail/node_pool.hpp>
#include <boost/interprocess/allocators/detail/allocator_common.hpp>
#include <boost/interprocess/detail/workaround.hpp>
#include <boost/interprocess/detail/utilities.hpp>
#include <boost/interprocess/containers/version_type.hpp>
#include <boost/interprocess/allocators/detail/node_tools.hpp>
#include <cstddef>
//!\file
//!Describes cached_cached_node_allocator pooled shared memory STL compatible allocator
namespace boost {
namespace interprocess {
/// @cond
namespace ipcdetail {
template < class T
, class SegmentManager
, std::size_t NodesPerBlock = 64
>
class cached_node_allocator_v1
: public ipcdetail::cached_allocator_impl
< T
, ipcdetail::shared_node_pool
< SegmentManager
, sizeof_value<T>::value
, NodesPerBlock
>
, 1>
{
public:
typedef ipcdetail::cached_allocator_impl
< T
, ipcdetail::shared_node_pool
< SegmentManager
, sizeof_value<T>::value
, NodesPerBlock
>
, 1> base_t;
template<class T2>
struct rebind
{
typedef cached_node_allocator_v1
<T2, SegmentManager, NodesPerBlock> other;
};
typedef typename base_t::size_type size_type;
cached_node_allocator_v1(SegmentManager *segment_mngr,
size_type max_cached_nodes = base_t::DEFAULT_MAX_CACHED_NODES)
: base_t(segment_mngr, max_cached_nodes)
{}
template<class T2>
cached_node_allocator_v1
(const cached_node_allocator_v1
<T2, SegmentManager, NodesPerBlock> &other)
: base_t(other)
{}
};
} //namespace ipcdetail{
/// @endcond
template < class T
, class SegmentManager
, std::size_t NodesPerBlock
>
class cached_node_allocator
/// @cond
: public ipcdetail::cached_allocator_impl
< T
, ipcdetail::shared_node_pool
< SegmentManager
, sizeof_value<T>::value
, NodesPerBlock
>
, 2>
/// @endcond
{
#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
public:
typedef ipcdetail::cached_allocator_impl
< T
, ipcdetail::shared_node_pool
< SegmentManager
, sizeof_value<T>::value
, NodesPerBlock
>
, 2> base_t;
public:
typedef boost::interprocess::version_type<cached_node_allocator, 2> version;
typedef typename base_t::size_type size_type;
template<class T2>
struct rebind
{
typedef cached_node_allocator<T2, SegmentManager, NodesPerBlock> other;
};
cached_node_allocator(SegmentManager *segment_mngr,
size_type max_cached_nodes = base_t::DEFAULT_MAX_CACHED_NODES)
: base_t(segment_mngr, max_cached_nodes)
{}
template<class T2>
cached_node_allocator
(const cached_node_allocator<T2, SegmentManager, NodesPerBlock> &other)
: base_t(other)
{}
#else
public:
typedef implementation_defined::segment_manager segment_manager;
typedef segment_manager::void_pointer void_pointer;
typedef implementation_defined::pointer pointer;
typedef implementation_defined::const_pointer const_pointer;
typedef T value_type;
typedef typename ipcdetail::add_reference
<value_type>::type reference;
typedef typename ipcdetail::add_reference
<const value_type>::type const_reference;
typedef typename SegmentManager::size_type size_type;
typedef typename SegmentManager::difference_type difference_type;
//!Obtains cached_node_allocator from
//!cached_node_allocator
template<class T2>
struct rebind
{
typedef cached_node_allocator<T2, SegmentManager> other;
};
private:
//!Not assignable from
//!related cached_node_allocator
template<class T2, class SegmentManager2, std::size_t N2>
cached_node_allocator& operator=
(const cached_node_allocator<T2, SegmentManager2, N2>&);
//!Not assignable from
//!other cached_node_allocator
cached_node_allocator& operator=(const cached_node_allocator&);
public:
//!Constructor from a segment manager. If not present, constructs a node
//!pool. Increments the reference count of the associated node pool.
//!Can throw boost::interprocess::bad_alloc
cached_node_allocator(segment_manager *segment_mngr);
//!Copy constructor from other cached_node_allocator. Increments the reference
//!count of the associated node pool. Never throws
cached_node_allocator(const cached_node_allocator &other);
//!Copy constructor from related cached_node_allocator. If not present, constructs
//!a node pool. Increments the reference count of the associated node pool.
//!Can throw boost::interprocess::bad_alloc
template<class T2>
cached_node_allocator
(const cached_node_allocator<T2, SegmentManager, NodesPerBlock> &other);
//!Destructor, removes node_pool_t from memory
//!if its reference count reaches to zero. Never throws
~cached_node_allocator();
//!Returns a pointer to the node pool.
//!Never throws
node_pool_t* get_node_pool() const;
//!Returns the segment manager.
//!Never throws
segment_manager* get_segment_manager()const;
//!Returns the number of elements that could be allocated.
//!Never throws
size_type max_size() const;
//!Allocate memory for an array of count elements.
//!Throws boost::interprocess::bad_alloc if there is no enough memory
pointer allocate(size_type count, cvoid_pointer hint = 0);
//!Deallocate allocated memory.
//!Never throws
void deallocate(const pointer &ptr, size_type count);
//!Deallocates all free blocks
//!of the pool
void 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(self_t &alloc1, self_t &alloc2);
//!Returns address of mutable object.
//!Never throws
pointer address(reference value) const;
//!Returns address of non mutable object.
//!Never throws
const_pointer address(const_reference value) const;
//!Default construct an object.
//!Throws if T's default constructor throws
void construct(const pointer &ptr, const_reference v);
//!Destroys object. Throws if object's
//!destructor throws
void destroy(const pointer &ptr);
//!Returns maximum the number of objects the previously allocated memory
//!pointed by p can hold. This size only works for memory allocated with
//!allocate, allocation_command and allocate_many.
size_type size(const pointer &p) const;
std::pair<pointer, bool>
allocation_command(boost::interprocess::allocation_type command,
size_type limit_size,
size_type preferred_size,
size_type &received_size, const pointer &reuse = 0);
//!Allocates many elements of size elem_size in a contiguous block
//!of memory. The minimum number to be allocated is min_elements,
//!the preferred and maximum number is
//!preferred_elements. The number of actually allocated elements is
//!will be assigned to received_size. The elements must be deallocated
//!with deallocate(...)
void allocate_many(size_type elem_size, size_type num_elements, multiallocation_chain &chain);
//!Allocates n_elements elements, each one of size elem_sizes[i]in a
//!contiguous block
//!of memory. The elements must be deallocated
void allocate_many(const size_type *elem_sizes, size_type n_elements, multiallocation_chain &chain);
//!Allocates many elements of size elem_size in a contiguous block
//!of memory. The minimum number to be allocated is min_elements,
//!the preferred and maximum number is
//!preferred_elements. The number of actually allocated elements is
//!will be assigned to received_size. The elements must be deallocated
//!with deallocate(...)
void deallocate_many(multiallocation_chain &chain);
//!Allocates just one object. Memory allocated with this function
//!must be deallocated only with deallocate_one().
//!Throws boost::interprocess::bad_alloc if there is no enough memory
pointer allocate_one();
//!Allocates many elements of size == 1 in a contiguous block
//!of memory. The minimum number to be allocated is min_elements,
//!the preferred and maximum number is
//!preferred_elements. The number of actually allocated elements is
//!will be assigned to received_size. Memory allocated with this function
//!must be deallocated only with deallocate_one().
multiallocation_chain allocate_individual(size_type num_elements);
//!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(const pointer &p);
//!Allocates many elements of size == 1 in a contiguous block
//!of memory. The minimum number to be allocated is min_elements,
//!the preferred and maximum number is
//!preferred_elements. The number of actually allocated elements is
//!will be assigned to received_size. Memory allocated with this function
//!must be deallocated only with deallocate_one().
void deallocate_individual(multiallocation_chain it);
//!Sets the new max cached nodes value. This can provoke deallocations
//!if "newmax" is less than current cached nodes. Never throws
void set_max_cached_nodes(size_type newmax);
//!Returns the max cached nodes parameter.
//!Never throws
size_type get_max_cached_nodes() const;
#endif
};
#ifdef BOOST_INTERPROCESS_DOXYGEN_INVOKED
//!Equality test for same type
//!of cached_node_allocator
template<class T, class S, std::size_t NPC> inline
bool operator==(const cached_node_allocator<T, S, NPC> &alloc1,
const cached_node_allocator<T, S, NPC> &alloc2);
//!Inequality test for same type
//!of cached_node_allocator
template<class T, class S, std::size_t NPC> inline
bool operator!=(const cached_node_allocator<T, S, NPC> &alloc1,
const cached_node_allocator<T, S, NPC> &alloc2);
#endif
} //namespace interprocess {
} //namespace boost {
#include <boost/interprocess/detail/config_end.hpp>
#endif //#ifndef BOOST_INTERPROCESS_CACHED_NODE_ALLOCATOR_HPP