mirror of
https://github.com/ton-blockchain/ton
synced 2025-03-09 15:40:10 +00:00
83 lines
2.3 KiB
C++
83 lines
2.3 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 <memory>
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namespace td {
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namespace detail {
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struct RawCancellationToken {
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std::atomic<bool> is_cancelled_{false};
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};
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} // namespace detail
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class CancellationToken {
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public:
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explicit operator bool() const {
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// Empty CancellationToken is never cancelled
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if (!token_) {
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return false;
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}
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return token_->is_cancelled_.load(std::memory_order_acquire);
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}
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CancellationToken() = default;
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explicit CancellationToken(std::shared_ptr<detail::RawCancellationToken> token) : token_(std::move(token)) {
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}
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private:
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std::shared_ptr<detail::RawCancellationToken> token_;
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};
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class CancellationTokenSource {
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public:
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CancellationTokenSource() = default;
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CancellationTokenSource(CancellationTokenSource &&other) : token_(std::move(other.token_)) {
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}
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CancellationTokenSource &operator=(CancellationTokenSource &&other) {
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cancel();
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token_ = std::move(other.token_);
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return *this;
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}
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CancellationTokenSource(const CancellationTokenSource &other) = delete;
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CancellationTokenSource &operator=(const CancellationTokenSource &other) = delete;
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~CancellationTokenSource() {
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cancel();
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}
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CancellationToken get_cancellation_token() {
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if (!token_) {
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token_ = std::make_shared<detail::RawCancellationToken>();
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}
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return CancellationToken(token_);
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}
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void cancel() {
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if (!token_) {
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return;
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}
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token_->is_cancelled_.store(true, std::memory_order_release);
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token_.reset();
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}
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private:
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std::shared_ptr<detail::RawCancellationToken> token_;
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};
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} // namespace td
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