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60 lines
1.6 KiB
60 lines
1.6 KiB
/*
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This file is part of cpp-ethereum.
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cpp-ethereum is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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cpp-ethereum 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 General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <utility>
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#include <queue>
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#include <condition_variable>
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#include <mutex>
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namespace dev
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{
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/// Concurrent queue.
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/// You can push and pop elements to/from the queue. Pop will block until the queue is not empty.
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/// The default backend (_QueueT) is std::queue. It can be changed to any type that has
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/// proper push(), pop(), empty() and front() methods.
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template<typename _T, typename _QueueT = std::queue<_T>>
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class concurrent_queue
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{
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public:
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template<typename _U>
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void push(_U&& _elem)
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{
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{
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std::lock_guard<decltype(x_mutex)> guard{x_mutex};
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m_queue.push(std::forward<_U>(_elem));
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}
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m_cv.notify_one();
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}
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_T pop()
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{
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std::unique_lock<std::mutex> lock{x_mutex};
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m_cv.wait(lock, [this]{ return !m_queue.empty(); });
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auto item = std::move(m_queue.front());
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m_queue.pop();
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return item;
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}
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private:
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_QueueT m_queue;
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std::mutex x_mutex;
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std::condition_variable m_cv;
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};
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}
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