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tdlib-fork/tdutils/td/utils/SharedObjectPool.h

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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
//
// 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)
//
#pragma once
#include "td/utils/common.h"
#include "td/utils/logging.h"
#include "td/utils/MpscLinkQueue.h"
#include <atomic>
#include <memory>
#include <new>
#include <utility>
namespace td {
namespace detail {
class AtomicRefCnt {
public:
explicit AtomicRefCnt(uint64 cnt) : cnt_(cnt) {
}
void inc() {
cnt_.fetch_add(1, std::memory_order_relaxed);
}
bool dec() {
return cnt_.fetch_sub(1, std::memory_order_acq_rel) == 1;
}
uint64 value() const {
return cnt_.load(std::memory_order_relaxed);
}
private:
std::atomic<uint64> cnt_;
};
template <class DataT, class DeleterT>
class SharedPtrRaw
: public DeleterT
, private MpscLinkQueueImpl::Node {
public:
explicit SharedPtrRaw(DeleterT deleter) : DeleterT(std::move(deleter)), ref_cnt_{0}, option_magic_(Magic) {
}
~SharedPtrRaw() {
CHECK(use_cnt() == 0);
CHECK(option_magic_ == Magic);
}
template <class... ArgsT>
void init_data(ArgsT &&... args) {
new (&option_data_) DataT(std::forward<ArgsT>(args)...);
}
void destroy_data() {
option_data_.~DataT();
option_magic_ = Magic;
}
uint64 use_cnt() const {
return ref_cnt_.value();
}
void inc() {
ref_cnt_.inc();
}
bool dec() {
return ref_cnt_.dec();
}
DataT &data() {
return option_data_;
}
static SharedPtrRaw *from_mpsc_link_queue_node(MpscLinkQueueImpl::Node *node) {
return static_cast<SharedPtrRaw<DataT, DeleterT> *>(node);
}
MpscLinkQueueImpl::Node *to_mpsc_link_queue_node() {
return static_cast<MpscLinkQueueImpl::Node *>(this);
}
private:
AtomicRefCnt ref_cnt_;
enum { Magic = 0x732817a2 };
union {
DataT option_data_;
uint32 option_magic_;
};
};
template <class T, class DeleterT = std::default_delete<T>>
class SharedPtr {
public:
using Raw = detail::SharedPtrRaw<T, DeleterT>;
SharedPtr() = default;
~SharedPtr() {
if (!raw_) {
return;
}
reset();
}
explicit SharedPtr(Raw *raw) : raw_(raw) {
if (raw_) {
raw_->inc();
}
}
SharedPtr(const SharedPtr &other) : SharedPtr(other.raw_) {
}
SharedPtr &operator=(const SharedPtr &other) {
if (other.raw_) {
other.raw_->inc();
}
reset(other.raw_);
return *this;
}
SharedPtr(SharedPtr &&other) : raw_(other.raw_) {
other.raw_ = nullptr;
}
SharedPtr &operator=(SharedPtr &&other) {
reset(other.raw_);
other.raw_ = nullptr;
return *this;
}
bool empty() const {
return raw_ == nullptr;
}
explicit operator bool() const {
return !empty();
}
uint64 use_cnt() const {
if (!raw_) {
return 0;
}
return raw_->use_cnt();
}
T &operator*() const {
return raw_->data();
}
T *operator->() const {
return &raw_->data();
}
Raw *release() {
auto res = raw_;
raw_ = nullptr;
return res;
}
void reset(Raw *new_raw = nullptr) {
if (raw_ && raw_->dec()) {
raw_->destroy_data();
auto deleter = std::move(static_cast<DeleterT &>(*raw_));
deleter(raw_);
}
raw_ = new_raw;
}
template <class... ArgsT>
static SharedPtr<T, DeleterT> create(ArgsT &&... args) {
auto raw = make_unique<Raw>(DeleterT());
raw->init_data(std::forward<ArgsT>(args)...);
return SharedPtr<T, DeleterT>(raw.release());
}
template <class D, class... ArgsT>
static SharedPtr<T, DeleterT> create_with_deleter(D &&d, ArgsT &&... args) {
auto raw = make_unique<Raw>(std::forward<D>(d));
raw->init_data(std::forward<ArgsT>(args)...);
return SharedPtr<T, DeleterT>(raw.release());
}
bool operator==(const SharedPtr<T, DeleterT> &other) const {
return raw_ == other.raw_;
}
private:
Raw *raw_{nullptr};
};
} // namespace detail
template <class DataT>
class SharedObjectPool {
class Deleter;
public:
using Ptr = detail::SharedPtr<DataT, Deleter>;
SharedObjectPool() = default;
SharedObjectPool(const SharedObjectPool &other) = delete;
SharedObjectPool &operator=(const SharedObjectPool &other) = delete;
SharedObjectPool(SharedObjectPool &&other) = delete;
SharedObjectPool &operator=(SharedObjectPool &&other) = delete;
~SharedObjectPool() {
free_queue_.pop_all(free_queue_reader_);
size_t free_cnt = 0;
while (free_queue_reader_.read()) {
free_cnt++;
}
CHECK(free_cnt == allocated_.size()) << free_cnt << " " << allocated_.size();
}
template <class... ArgsT>
Ptr alloc(ArgsT &&... args) {
auto *raw = alloc_raw();
raw->init_data(std::forward<ArgsT>(args)...);
return Ptr(raw);
}
size_t total_size() const {
return allocated_.size();
}
uint64 calc_free_size() {
free_queue_.pop_all(free_queue_reader_);
return free_queue_reader_.calc_size();
}
//non thread safe
template <class F>
void for_each(F &&f) {
for (auto &raw : allocated_) {
if (raw->use_cnt() > 0) {
f(raw->data());
}
}
}
private:
using Raw = typename Ptr::Raw;
Raw *alloc_raw() {
free_queue_.pop_all(free_queue_reader_);
auto *raw = free_queue_reader_.read().get();
if (raw) {
return raw;
}
allocated_.push_back(make_unique<Raw>(deleter()));
return allocated_.back().get();
}
void free_raw(Raw *raw) {
free_queue_.push(Node{raw});
}
class Node {
public:
Node() = default;
explicit Node(Raw *raw) : raw_(raw) {
}
MpscLinkQueueImpl::Node *to_mpsc_link_queue_node() {
return raw_->to_mpsc_link_queue_node();
}
static Node from_mpsc_link_queue_node(MpscLinkQueueImpl::Node *node) {
return Node{Raw::from_mpsc_link_queue_node(node)};
}
Raw *get() const {
return raw_;
}
explicit operator bool() const {
return raw_ != nullptr;
}
private:
Raw *raw_{nullptr};
};
class Deleter {
public:
explicit Deleter(SharedObjectPool<DataT> *pool) : pool_(pool) {
}
void operator()(Raw *raw) {
pool_->free_raw(raw);
};
private:
SharedObjectPool<DataT> *pool_;
};
friend class Deleter;
Deleter deleter() {
return Deleter(this);
}
std::vector<unique_ptr<Raw>> allocated_;
MpscLinkQueue<Node> free_queue_;
typename MpscLinkQueue<Node>::Reader free_queue_reader_;
};
} // namespace td