forked from boostorg/container
342 lines
12 KiB
C++
342 lines
12 KiB
C++
//////////////////////////////////////////////////////////////////////////////
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//
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// (C) Copyright Ion Gaztanaga 2008-2013. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/container for documentation.
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//
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//////////////////////////////////////////////////////////////////////////////
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#ifndef BOOST_CONTAINER_POOLED_NODE_ALLOCATOR_HPP
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#define BOOST_CONTAINER_POOLED_NODE_ALLOCATOR_HPP
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#ifndef BOOST_CONFIG_HPP
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# include <boost/config.hpp>
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#endif
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#if defined(BOOST_HAS_PRAGMA_ONCE)
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# pragma once
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#endif
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#include <boost/container/detail/config_begin.hpp>
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#include <boost/container/detail/workaround.hpp>
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#include <boost/container/container_fwd.hpp>
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#include <boost/container/throw_exception.hpp>
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#include <boost/container/detail/node_pool.hpp>
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#include <boost/container/detail/mpl.hpp>
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#include <boost/container/detail/multiallocation_chain.hpp>
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#include <boost/container/detail/dlmalloc.hpp>
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#include <boost/container/detail/singleton.hpp>
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#include <boost/assert.hpp>
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#include <boost/static_assert.hpp>
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#include <cstddef>
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namespace boost {
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namespace container {
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//!An STL node allocator that uses a modified DlMalloc as memory
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//!source.
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//!
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//!This node allocator shares a segregated storage between all instances
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//!of node_allocator with equal sizeof(T).
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//!
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//!NodesPerBlock is the number of nodes allocated at once when the allocator
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//!runs out of nodes
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#ifdef BOOST_CONTAINER_DOXYGEN_INVOKED
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template
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< class T
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, std::size_t NodesPerBlock = NodeAlloc_nodes_per_block>
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#else
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template
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< class T
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, std::size_t NodesPerBlock
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, std::size_t Version>
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#endif
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class node_allocator
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{
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#ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
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//! If Version is 1, the allocator is a STL conforming allocator. If Version is 2,
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//! the allocator offers advanced expand in place and burst allocation capabilities.
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public:
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typedef unsigned int allocation_type;
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typedef node_allocator<T, NodesPerBlock, Version> self_t;
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static const std::size_t nodes_per_block = NodesPerBlock;
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BOOST_STATIC_ASSERT((Version <=2));
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#endif
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public:
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//-------
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typedef T value_type;
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typedef T * pointer;
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typedef const T * const_pointer;
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typedef typename ::boost::container::
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dtl::unvoid_ref<T>::type reference;
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typedef typename ::boost::container::
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dtl::unvoid_ref<const T>::type const_reference;
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typedef std::size_t size_type;
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typedef std::ptrdiff_t difference_type;
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typedef boost::container::dtl::
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version_type<self_t, Version> version;
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#ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
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typedef boost::container::dtl::
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basic_multiallocation_chain<void*> multiallocation_chain_void;
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typedef boost::container::dtl::
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transform_multiallocation_chain
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<multiallocation_chain_void, T> multiallocation_chain;
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#endif //#ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
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//!Obtains node_allocator from
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//!node_allocator
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template<class T2>
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struct rebind
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{
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typedef node_allocator< T2, NodesPerBlock
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#ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
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, Version
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#endif
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> other;
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};
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#ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
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private:
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//!Not assignable from related node_allocator
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template<class T2, std::size_t N2>
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node_allocator& operator=
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(const node_allocator<T2, N2>&);
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#endif //#ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
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public:
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//!Default constructor
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node_allocator() BOOST_NOEXCEPT_OR_NOTHROW
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{}
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//!Copy constructor from other node_allocator.
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node_allocator(const node_allocator &) BOOST_NOEXCEPT_OR_NOTHROW
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{}
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//!Copy constructor from related node_allocator.
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template<class T2>
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node_allocator
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(const node_allocator<T2, NodesPerBlock
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#ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
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, Version
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#endif
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> &) BOOST_NOEXCEPT_OR_NOTHROW
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{}
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//!Destructor
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~node_allocator() BOOST_NOEXCEPT_OR_NOTHROW
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{}
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//!Returns the number of elements that could be allocated.
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//!Never throws
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size_type max_size() const
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{ return size_type(-1)/sizeof(T); }
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//!Allocate memory for an array of count elements.
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//!Throws std::bad_alloc if there is no enough memory
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pointer allocate(size_type count, const void * = 0)
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{
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if(BOOST_UNLIKELY(count > this->max_size()))
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boost::container::throw_bad_alloc();
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if(Version == 1 && count == 1){
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typedef dtl::shared_node_pool
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<sizeof(T), NodesPerBlock> shared_pool_t;
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typedef dtl::singleton_default<shared_pool_t> singleton_t;
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return pointer(static_cast<T*>(singleton_t::instance().allocate_node()));
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}
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else{
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void *ret = dlmalloc_malloc(count*sizeof(T));
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if(BOOST_UNLIKELY(!ret))
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boost::container::throw_bad_alloc();
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return static_cast<pointer>(ret);
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}
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}
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//!Deallocate allocated memory.
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//!Never throws
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void deallocate(const pointer &ptr, size_type count) BOOST_NOEXCEPT_OR_NOTHROW
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{
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(void)count;
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if(Version == 1 && count == 1){
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typedef dtl::shared_node_pool
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<sizeof(T), NodesPerBlock> shared_pool_t;
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typedef dtl::singleton_default<shared_pool_t> singleton_t;
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singleton_t::instance().deallocate_node(ptr);
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}
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else{
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dlmalloc_free(ptr);
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}
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}
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//!Deallocates all free blocks of the pool
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static void deallocate_free_blocks() BOOST_NOEXCEPT_OR_NOTHROW
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{
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typedef dtl::shared_node_pool
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<sizeof(T), NodesPerBlock> shared_pool_t;
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typedef dtl::singleton_default<shared_pool_t> singleton_t;
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singleton_t::instance().deallocate_free_blocks();
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}
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pointer allocation_command
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(allocation_type command, size_type limit_size, size_type &prefer_in_recvd_out_size, pointer &reuse)
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{
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BOOST_STATIC_ASSERT(( Version > 1 ));
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pointer ret = this->priv_allocation_command(command, limit_size, prefer_in_recvd_out_size, reuse);
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if(BOOST_UNLIKELY(!ret && !(command & BOOST_CONTAINER_NOTHROW_ALLOCATION)))
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boost::container::throw_bad_alloc();
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return ret;
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}
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//!Returns maximum the number of objects the previously allocated memory
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//!pointed by p can hold.
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size_type size(pointer p) const BOOST_NOEXCEPT_OR_NOTHROW
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{
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BOOST_STATIC_ASSERT(( Version > 1 ));
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return dlmalloc_size(p);
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}
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//!Allocates just one object. Memory allocated with this function
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//!must be deallocated only with deallocate_one().
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//!Throws bad_alloc if there is no enough memory
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pointer allocate_one()
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{
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BOOST_STATIC_ASSERT(( Version > 1 ));
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typedef dtl::shared_node_pool
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<sizeof(T), NodesPerBlock> shared_pool_t;
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typedef dtl::singleton_default<shared_pool_t> singleton_t;
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return (pointer)singleton_t::instance().allocate_node();
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}
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//!Allocates many elements of size == 1.
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//!Elements must be individually deallocated with deallocate_one()
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void allocate_individual(std::size_t num_elements, multiallocation_chain &chain)
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{
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BOOST_STATIC_ASSERT(( Version > 1 ));
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typedef dtl::shared_node_pool
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<sizeof(T), NodesPerBlock> shared_pool_t;
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typedef dtl::singleton_default<shared_pool_t> singleton_t;
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typename shared_pool_t::multiallocation_chain ch;
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singleton_t::instance().allocate_nodes(num_elements, ch);
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chain.incorporate_after(chain.before_begin(), (T*)&*ch.begin(), (T*)&*ch.last(), ch.size());
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}
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//!Deallocates memory previously allocated with allocate_one().
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//!You should never use deallocate_one to deallocate memory allocated
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//!with other functions different from allocate_one(). Never throws
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void deallocate_one(pointer p) BOOST_NOEXCEPT_OR_NOTHROW
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{
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BOOST_STATIC_ASSERT(( Version > 1 ));
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typedef dtl::shared_node_pool
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<sizeof(T), NodesPerBlock> shared_pool_t;
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typedef dtl::singleton_default<shared_pool_t> singleton_t;
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singleton_t::instance().deallocate_node(p);
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}
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void deallocate_individual(multiallocation_chain &chain) BOOST_NOEXCEPT_OR_NOTHROW
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{
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BOOST_STATIC_ASSERT(( Version > 1 ));
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typedef dtl::shared_node_pool
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<sizeof(T), NodesPerBlock> shared_pool_t;
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typedef dtl::singleton_default<shared_pool_t> singleton_t;
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typename shared_pool_t::multiallocation_chain ch(&*chain.begin(), &*chain.last(), chain.size());
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singleton_t::instance().deallocate_nodes(ch);
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}
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//!Allocates many elements of size elem_size.
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//!Elements must be individually deallocated with deallocate()
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void allocate_many(size_type elem_size, std::size_t n_elements, multiallocation_chain &chain)
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{
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BOOST_STATIC_ASSERT(( Version > 1 ));
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dlmalloc_memchain ch;
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BOOST_CONTAINER_MEMCHAIN_INIT(&ch);
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if(BOOST_UNLIKELY(!dlmalloc_multialloc_nodes(n_elements, elem_size*sizeof(T), DL_MULTIALLOC_DEFAULT_CONTIGUOUS, &ch))){
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boost::container::throw_bad_alloc();
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}
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chain.incorporate_after( chain.before_begin()
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, (T*)BOOST_CONTAINER_MEMCHAIN_LASTMEM(&ch)
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, (T*)BOOST_CONTAINER_MEMCHAIN_LASTMEM(&ch)
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, BOOST_CONTAINER_MEMCHAIN_SIZE(&ch));
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}
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//!Allocates n_elements elements, each one of size elem_sizes[i]
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//!Elements must be individually deallocated with deallocate()
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void allocate_many(const size_type *elem_sizes, size_type n_elements, multiallocation_chain &chain)
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{
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BOOST_STATIC_ASSERT(( Version > 1 ));
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dlmalloc_memchain ch;
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dlmalloc_multialloc_arrays(n_elements, elem_sizes, sizeof(T), DL_MULTIALLOC_DEFAULT_CONTIGUOUS, &ch);
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if(BOOST_UNLIKELY(BOOST_CONTAINER_MEMCHAIN_EMPTY(&ch))){
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boost::container::throw_bad_alloc();
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}
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chain.incorporate_after( chain.before_begin()
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, (T*)BOOST_CONTAINER_MEMCHAIN_LASTMEM(&ch)
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, (T*)BOOST_CONTAINER_MEMCHAIN_LASTMEM(&ch)
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, BOOST_CONTAINER_MEMCHAIN_SIZE(&ch));
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}
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void deallocate_many(multiallocation_chain &chain) BOOST_NOEXCEPT_OR_NOTHROW
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{
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BOOST_STATIC_ASSERT(( Version > 1 ));
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void *first = &*chain.begin();
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void *last = &*chain.last();
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size_t num = chain.size();
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dlmalloc_memchain ch;
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BOOST_CONTAINER_MEMCHAIN_INIT_FROM(&ch, first, last, num);
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dlmalloc_multidealloc(&ch);
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}
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//!Swaps allocators. Does not throw. If each allocator is placed in a
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//!different memory segment, the result is undefined.
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friend void swap(self_t &, self_t &) BOOST_NOEXCEPT_OR_NOTHROW
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{}
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//!An allocator always compares to true, as memory allocated with one
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//!instance can be deallocated by another instance
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friend bool operator==(const node_allocator &, const node_allocator &) BOOST_NOEXCEPT_OR_NOTHROW
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{ return true; }
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//!An allocator always compares to false, as memory allocated with one
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//!instance can be deallocated by another instance
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friend bool operator!=(const node_allocator &, const node_allocator &) BOOST_NOEXCEPT_OR_NOTHROW
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{ return false; }
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private:
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pointer priv_allocation_command
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(allocation_type command, std::size_t limit_size
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,size_type &prefer_in_recvd_out_size
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,pointer &reuse)
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{
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std::size_t const preferred_size = prefer_in_recvd_out_size;
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dlmalloc_command_ret_t ret = {0 , 0};
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if((limit_size > this->max_size()) | (preferred_size > this->max_size())){
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return pointer();
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}
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std::size_t l_size = limit_size*sizeof(T);
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std::size_t p_size = preferred_size*sizeof(T);
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std::size_t r_size;
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{
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void* reuse_ptr_void = reuse;
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ret = dlmalloc_allocation_command(command, sizeof(T), l_size, p_size, &r_size, reuse_ptr_void);
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reuse = static_cast<T*>(reuse_ptr_void);
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}
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prefer_in_recvd_out_size = r_size/sizeof(T);
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return (pointer)ret.first;
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}
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};
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} //namespace container {
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} //namespace boost {
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#include <boost/container/detail/config_end.hpp>
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#endif //#ifndef BOOST_CONTAINER_POOLED_NODE_ALLOCATOR_HPP
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