mirror of
https://github.com/ecency/ecency-mobile.git
synced 2024-12-21 04:11:50 +03:00
342 lines
13 KiB
C++
342 lines
13 KiB
C++
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// (C) Copyright Ion Gaztanaga 2008-2013. 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_POOLED_NODE_ALLOCATOR_HPP
|
|
#define BOOST_CONTAINER_POOLED_NODE_ALLOCATOR_HPP
|
|
|
|
#ifndef BOOST_CONFIG_HPP
|
|
# include <boost/config.hpp>
|
|
#endif
|
|
|
|
#if defined(BOOST_HAS_PRAGMA_ONCE)
|
|
# 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/throw_exception.hpp>
|
|
#include <boost/container/detail/node_pool.hpp>
|
|
#include <boost/container/detail/mpl.hpp>
|
|
#include <boost/container/detail/multiallocation_chain.hpp>
|
|
#include <boost/container/detail/dlmalloc.hpp>
|
|
#include <boost/container/detail/singleton.hpp>
|
|
|
|
#include <boost/assert.hpp>
|
|
#include <boost/static_assert.hpp>
|
|
#include <cstddef>
|
|
|
|
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 node_allocator with equal sizeof(T).
|
|
//!
|
|
//!NodesPerBlock is the number of nodes allocated at once when the allocator
|
|
//!runs out of nodes
|
|
#ifdef BOOST_CONTAINER_DOXYGEN_INVOKED
|
|
template
|
|
< class T
|
|
, std::size_t NodesPerBlock = NodeAlloc_nodes_per_block>
|
|
#else
|
|
template
|
|
< class T
|
|
, std::size_t NodesPerBlock
|
|
, std::size_t Version>
|
|
#endif
|
|
class node_allocator
|
|
{
|
|
#ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
|
|
//! 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 node_allocator<T, NodesPerBlock, Version> self_t;
|
|
|
|
static const std::size_t nodes_per_block = NodesPerBlock;
|
|
|
|
BOOST_STATIC_ASSERT((Version <=2));
|
|
#endif
|
|
|
|
public:
|
|
//-------
|
|
typedef T value_type;
|
|
typedef T * pointer;
|
|
typedef const T * const_pointer;
|
|
typedef typename ::boost::container::
|
|
container_detail::unvoid_ref<T>::type reference;
|
|
typedef typename ::boost::container::
|
|
container_detail::unvoid_ref<const 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 node_allocator from
|
|
//!node_allocator
|
|
template<class T2>
|
|
struct rebind
|
|
{
|
|
typedef node_allocator< T2, NodesPerBlock
|
|
#ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
|
|
, Version
|
|
#endif
|
|
> other;
|
|
};
|
|
|
|
#ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
|
|
private:
|
|
//!Not assignable from related node_allocator
|
|
template<class T2, std::size_t N2>
|
|
node_allocator& operator=
|
|
(const node_allocator<T2, N2>&);
|
|
#endif //#ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
|
|
|
|
public:
|
|
|
|
//!Default constructor
|
|
node_allocator() BOOST_NOEXCEPT_OR_NOTHROW
|
|
{}
|
|
|
|
//!Copy constructor from other node_allocator.
|
|
node_allocator(const node_allocator &) BOOST_NOEXCEPT_OR_NOTHROW
|
|
{}
|
|
|
|
//!Copy constructor from related node_allocator.
|
|
template<class T2>
|
|
node_allocator
|
|
(const node_allocator<T2, NodesPerBlock
|
|
#ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
|
|
, Version
|
|
#endif
|
|
> &) BOOST_NOEXCEPT_OR_NOTHROW
|
|
{}
|
|
|
|
//!Destructor
|
|
~node_allocator() BOOST_NOEXCEPT_OR_NOTHROW
|
|
{}
|
|
|
|
//!Returns the number of elements that could be allocated.
|
|
//!Never throws
|
|
size_type max_size() const
|
|
{ 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(BOOST_UNLIKELY(count > this->max_size()))
|
|
boost::container::throw_bad_alloc();
|
|
|
|
if(Version == 1 && count == 1){
|
|
typedef container_detail::shared_node_pool
|
|
<sizeof(T), NodesPerBlock> shared_pool_t;
|
|
typedef container_detail::singleton_default<shared_pool_t> singleton_t;
|
|
return pointer(static_cast<T*>(singleton_t::instance().allocate_node()));
|
|
}
|
|
else{
|
|
void *ret = dlmalloc_malloc(count*sizeof(T));
|
|
if(BOOST_UNLIKELY(!ret))
|
|
boost::container::throw_bad_alloc();
|
|
return static_cast<pointer>(ret);
|
|
}
|
|
}
|
|
|
|
//!Deallocate allocated memory.
|
|
//!Never throws
|
|
void deallocate(const pointer &ptr, size_type count) BOOST_NOEXCEPT_OR_NOTHROW
|
|
{
|
|
(void)count;
|
|
if(Version == 1 && count == 1){
|
|
typedef container_detail::shared_node_pool
|
|
<sizeof(T), NodesPerBlock> shared_pool_t;
|
|
typedef container_detail::singleton_default<shared_pool_t> singleton_t;
|
|
singleton_t::instance().deallocate_node(ptr);
|
|
}
|
|
else{
|
|
dlmalloc_free(ptr);
|
|
}
|
|
}
|
|
|
|
//!Deallocates all free blocks of the pool
|
|
static void deallocate_free_blocks() BOOST_NOEXCEPT_OR_NOTHROW
|
|
{
|
|
typedef container_detail::shared_node_pool
|
|
<sizeof(T), NodesPerBlock> shared_pool_t;
|
|
typedef container_detail::singleton_default<shared_pool_t> singleton_t;
|
|
singleton_t::instance().deallocate_free_blocks();
|
|
}
|
|
|
|
pointer allocation_command
|
|
(allocation_type command, size_type limit_size, size_type &prefer_in_recvd_out_size, pointer &reuse)
|
|
{
|
|
BOOST_STATIC_ASSERT(( Version > 1 ));
|
|
pointer ret = this->priv_allocation_command(command, limit_size, prefer_in_recvd_out_size, reuse);
|
|
if(BOOST_UNLIKELY(!ret && !(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_NOEXCEPT_OR_NOTHROW
|
|
{
|
|
BOOST_STATIC_ASSERT(( Version > 1 ));
|
|
return dlmalloc_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()
|
|
{
|
|
BOOST_STATIC_ASSERT(( Version > 1 ));
|
|
typedef container_detail::shared_node_pool
|
|
<sizeof(T), NodesPerBlock> 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)
|
|
{
|
|
BOOST_STATIC_ASSERT(( Version > 1 ));
|
|
typedef container_detail::shared_node_pool
|
|
<sizeof(T), NodesPerBlock> shared_pool_t;
|
|
typedef container_detail::singleton_default<shared_pool_t> singleton_t;
|
|
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_NOEXCEPT_OR_NOTHROW
|
|
{
|
|
BOOST_STATIC_ASSERT(( Version > 1 ));
|
|
typedef container_detail::shared_node_pool
|
|
<sizeof(T), NodesPerBlock> 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_NOEXCEPT_OR_NOTHROW
|
|
{
|
|
BOOST_STATIC_ASSERT(( Version > 1 ));
|
|
typedef container_detail::shared_node_pool
|
|
<sizeof(T), NodesPerBlock> 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);
|
|
}
|
|
|
|
//!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 ));
|
|
dlmalloc_memchain ch;
|
|
BOOST_CONTAINER_MEMCHAIN_INIT(&ch);
|
|
if(BOOST_UNLIKELY(!dlmalloc_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_LASTMEM(&ch)
|
|
, (T*)BOOST_CONTAINER_MEMCHAIN_LASTMEM(&ch)
|
|
, BOOST_CONTAINER_MEMCHAIN_SIZE(&ch));
|
|
}
|
|
|
|
//!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 ));
|
|
dlmalloc_memchain ch;
|
|
dlmalloc_multialloc_arrays(n_elements, elem_sizes, sizeof(T), DL_MULTIALLOC_DEFAULT_CONTIGUOUS, &ch);
|
|
if(BOOST_UNLIKELY(BOOST_CONTAINER_MEMCHAIN_EMPTY(&ch))){
|
|
boost::container::throw_bad_alloc();
|
|
}
|
|
chain.incorporate_after( chain.before_begin()
|
|
, (T*)BOOST_CONTAINER_MEMCHAIN_LASTMEM(&ch)
|
|
, (T*)BOOST_CONTAINER_MEMCHAIN_LASTMEM(&ch)
|
|
, BOOST_CONTAINER_MEMCHAIN_SIZE(&ch));
|
|
}
|
|
|
|
void deallocate_many(multiallocation_chain &chain) BOOST_NOEXCEPT_OR_NOTHROW
|
|
{
|
|
BOOST_STATIC_ASSERT(( Version > 1 ));
|
|
void *first = &*chain.begin();
|
|
void *last = &*chain.last();
|
|
size_t num = chain.size();
|
|
dlmalloc_memchain ch;
|
|
BOOST_CONTAINER_MEMCHAIN_INIT_FROM(&ch, first, last, num);
|
|
dlmalloc_multidealloc(&ch);
|
|
}
|
|
|
|
//!Swaps allocators. Does not throw. If each allocator is placed in a
|
|
//!different memory segment, the result is undefined.
|
|
friend void swap(self_t &, self_t &) BOOST_NOEXCEPT_OR_NOTHROW
|
|
{}
|
|
|
|
//!An allocator always compares to true, as memory allocated with one
|
|
//!instance can be deallocated by another instance
|
|
friend bool operator==(const node_allocator &, const node_allocator &) BOOST_NOEXCEPT_OR_NOTHROW
|
|
{ return true; }
|
|
|
|
//!An allocator always compares to false, as memory allocated with one
|
|
//!instance can be deallocated by another instance
|
|
friend bool operator!=(const node_allocator &, const node_allocator &) BOOST_NOEXCEPT_OR_NOTHROW
|
|
{ return false; }
|
|
|
|
private:
|
|
pointer priv_allocation_command
|
|
(allocation_type command, std::size_t limit_size
|
|
,size_type &prefer_in_recvd_out_size
|
|
,pointer &reuse)
|
|
{
|
|
std::size_t const preferred_size = prefer_in_recvd_out_size;
|
|
dlmalloc_command_ret_t ret = {0 , 0};
|
|
if((limit_size > this->max_size()) | (preferred_size > this->max_size())){
|
|
return pointer();
|
|
}
|
|
std::size_t l_size = limit_size*sizeof(T);
|
|
std::size_t p_size = preferred_size*sizeof(T);
|
|
std::size_t r_size;
|
|
{
|
|
void* reuse_ptr_void = reuse;
|
|
ret = dlmalloc_allocation_command(command, sizeof(T), l_size, p_size, &r_size, reuse_ptr_void);
|
|
reuse = static_cast<T*>(reuse_ptr_void);
|
|
}
|
|
prefer_in_recvd_out_size = r_size/sizeof(T);
|
|
return (pointer)ret.first;
|
|
}
|
|
};
|
|
|
|
} //namespace container {
|
|
} //namespace boost {
|
|
|
|
#include <boost/container/detail/config_end.hpp>
|
|
|
|
#endif //#ifndef BOOST_CONTAINER_POOLED_NODE_ALLOCATOR_HPP
|