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// license:BSD-3-Clause
// copyright-holders:Couriersud
#ifndef PMEMPOOL_H_
#define PMEMPOOL_H_
///
/// \file pmempool.h
///
#include "palloc.h"
#include "pconfig.h"
#include "pstream.h" // perrlogger
//#include "pstring.h"
#include "ptypes.h"
//#include "putil.h"
#include <algorithm>
#include <memory>
#include <unordered_map>
#include <utility>
#include <vector>
namespace plib {
//============================================================
// Memory pool
//============================================================
template <typename BASEARENA, std::size_t MINALIGN = PALIGN_MIN_SIZE>
class mempool_arena : public arena_base<mempool_arena<BASEARENA, MINALIGN>, MINALIGN, false, false>
{
public:
using size_type = typename BASEARENA::size_type;
using base_type = arena_base<mempool_arena<BASEARENA, MINALIGN>, MINALIGN, false, false>;
template <class T>
using base_allocator_type = typename BASEARENA::template allocator_type<T>;
using block_align = std::integral_constant<size_t, 1024>;
mempool_arena(size_t min_alloc = (1<<21));
PCOPYASSIGNMOVE(mempool_arena, delete)
~mempool_arena();
void *allocate(size_t align, size_t size);
void deallocate(void *ptr, std::size_t alignment, size_t size) noexcept;
bool operator ==(const mempool_arena &rhs) const noexcept { return this == &rhs; }
private:
struct block
{
block(mempool_arena &mp, size_type min_bytes);
~block()
{
//::operator delete(m_data_allocated);
//delete [] m_data_allocated;
m_mempool.base_arena().deallocate(m_data_allocated, mempool_arena::block_align(), m_bytes_allocated);
}
block(const block &) = delete;
block(block &&) = delete;
block &operator =(const block &) = delete;
block &operator =(block &&) = delete;
size_type m_num_alloc;
size_type m_free;
size_type m_cur;
size_type m_bytes_allocated;
std::uint8_t *m_data;
std::uint8_t *m_data_allocated;
mempool_arena &m_mempool;
};
struct info
{
info(block *b, size_type p, size_type orig_size) : m_block(b), m_pos(p), m_orig_size(orig_size) { }
info(const info &) = default;
info &operator=(const info &) = default;
info(info &&) noexcept = default;
info &operator=(info &&) noexcept = default;
~info() = default;
block * m_block;
size_type m_pos;
size_type m_orig_size;
};
block * new_block(size_type min_bytes)
{
auto *b = detail::alloc<block, 0>(base_arena(), *this, min_bytes);
m_blocks.push_back(b);
return b;
}
size_t m_min_alloc;
static BASEARENA &base_arena()
{
static BASEARENA s_arena;
return s_arena;
}
using info_type = std::pair<void * const, info>;
using info_allocator_type = typename BASEARENA::template allocator_type<info_type>;
std::unordered_map<void *, info, std::hash<void *>, std::equal_to<>,
info_allocator_type> m_info;
plib::arena_vector<BASEARENA, block *> m_blocks;
};
template <typename BASEARENA, std::size_t MINALIGN>
mempool_arena<BASEARENA, MINALIGN>::mempool_arena(size_t min_alloc)
: m_min_alloc(min_alloc)
//, m_blocks(base_allocator_type<block *>(base_arena()))
, m_blocks(base_arena())
{
}
template <typename BASEARENA, std::size_t MINALIGN>
mempool_arena<BASEARENA, MINALIGN>::~mempool_arena()
{
for (auto & b : m_blocks)
{
if (b->m_num_alloc != 0)
{
plib::perrlogger("Found {} info blocks\n", m_info.size());
plib::perrlogger("Found block with {} dangling allocations\n", b->m_num_alloc);
}
detail::free<0>(base_arena(), b);
}
if (!m_info.empty())
plib::perrlogger("Still found {} info blocks after mempool deleted\n", m_info.size());
}
template <typename BASEARENA, std::size_t MINALIGN>
void * mempool_arena<BASEARENA, MINALIGN>::allocate(size_t align, size_t size)
{
block *b = nullptr;
if (align < MINALIGN)
align = MINALIGN;
size_t rs = size + align;
for (auto &bs : m_blocks)
{
if (bs->m_free > rs)
{
b = bs;
break;
}
}
if (b == nullptr)
{
b = new_block(rs);
}
b->m_free -= rs;
b->m_num_alloc++;
void *ret = reinterpret_cast<void *>(b->m_data + b->m_cur); // NOLINT(cppcoreguidelines-pro-type-reinterpret
auto capacity(rs);
ret = std::align(align, size, ret, capacity);
m_info.insert({ ret, info(b, b->m_cur, size)});
rs -= (capacity - size);
b->m_cur += rs;
this->inc_alloc_stat(size);
return ret;
}
template <typename BASEARENA, std::size_t MINALIGN>
void mempool_arena<BASEARENA, MINALIGN>::deallocate(void *ptr, [[maybe_unused]] std::size_t alignment, size_t size) noexcept
{
auto it = m_info.find(ptr);
if (it == m_info.end())
plib::terminate("mempool::free - pointer not found");
block *b = it->second.m_block;
if (b->m_num_alloc == 0)
plib::terminate("mempool::free - double free was called");
if (it->second.m_orig_size != size)
plib::perrlogger("Size mismatch original {} vs {}\n", it->second.m_orig_size, size);
mempool_arena &mp = b->m_mempool;
b->m_num_alloc--;
mp.dec_alloc_stat(size);
if (b->m_num_alloc == 0)
{
auto itb = std::find(mp.m_blocks.begin(), mp.m_blocks.end(), b);
if (itb == mp.m_blocks.end())
plib::terminate("mempool::free - block not found");
mp.m_blocks.erase(itb);
detail::free<0>(mp.base_arena(), b);
}
m_info.erase(it);
}
template <typename BASEARENA, std::size_t MINALIGN>
mempool_arena<BASEARENA, MINALIGN>::block::block(mempool_arena &mp, size_type min_bytes)
: m_num_alloc(0)
, m_cur(0)
, m_data(nullptr)
, m_mempool(mp)
{
min_bytes = std::max(mp.m_min_alloc, min_bytes);
m_free = min_bytes;
m_bytes_allocated = (min_bytes + mempool_arena::block_align()); // - 1); // & ~(mp.m_min_align - 1);
// NOLINTNEXTLINE(cppcoreguidelines-owning-memory)
//m_data_allocated = new std::uint8_t[alloc_bytes];
m_data_allocated = static_cast<std::uint8_t *>(mp.base_arena().allocate(mempool_arena::block_align(), m_bytes_allocated));
void *r = m_data_allocated;
std::align(mempool_arena::block_align(), min_bytes, r, m_bytes_allocated);
m_data = reinterpret_cast<std::uint8_t *>(r); // NOLINT(cppcoreguidelines-pro-type-reinterpret
}
} // namespace plib
#endif // PMEMPOOL_H_
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