mirror of
https://github.com/ton-blockchain/ton
synced 2025-02-13 11:42:18 +00:00
67 lines
1.6 KiB
C++
67 lines
1.6 KiB
C++
/*
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This file is part of TON Blockchain Library.
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TON Blockchain Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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TON Blockchain Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with TON Blockchain Library. If not, see <http://www.gnu.org/licenses/>.
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Copyright 2017-2020 Telegram Systems LLP
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*/
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#pragma once
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#include <atomic>
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#include "td/utils/MovableValue.h"
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#include <memory>
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namespace td {
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template <class T>
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class SharedState {
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public:
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friend class Guard;
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class Guard {
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public:
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Guard(Guard &&) = default;
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Guard(SharedState<T> *self) : self(self) {
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CHECK(!self->data_->is_locked.exchange(true));
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}
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~Guard() {
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if (self.get()) {
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CHECK(self.get()->data_->is_locked.exchange(false));
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}
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}
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T *get() {
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return &self.get()->data_->data;
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}
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T *operator->() {
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return get();
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}
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private:
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td::MovableValue<SharedState<T> *> self;
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};
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auto lock() {
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return Guard{this};
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}
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auto unsafe() {
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return &data_->data;
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}
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private:
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struct Data {
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std::atomic<bool> is_locked{};
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T data;
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};
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std::shared_ptr<Data> data_{std::make_shared<Data>()};
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};
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} // namespace td
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