You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
61 lines
1.6 KiB
61 lines
1.6 KiB
9 years ago
|
/*
|
||
|
|
This file is part of cpp-ethereum.
|
||
|
|
|
||
|
|
cpp-ethereum is free software: you can redistribute it and/or modify
|
||
|
|
it under the terms of the GNU General Public License as published by
|
||
|
|
the Free Software Foundation, either version 3 of the License, or
|
||
|
|
(at your option) any later version.
|
||
|
|
|
||
|
|
cpp-ethereum is distributed in the hope that it will be useful,
|
||
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
GNU General Public License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU General Public License
|
||
|
|
along with cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
*/
|
||
|
|
#pragma once
|
||
|
|
#include <utility>
|
||
|
|
#include <queue>
|
||
|
|
#include <condition_variable>
|
||
|
|
#include <mutex>
|
||
|
|
|
||
|
|
|
||
|
|
namespace dev
|
||
|
|
{
|
||
|
|
|
||
|
|
/// Concurrent queue.
|
||
|
|
/// You can push and pop elements to/from the queue. Pop will block until the queue is not empty.
|
||
|
|
/// The default backend (_QueueT) is std::queue. It can be changed to any type that has
|
||
|
|
/// proper push(), pop(), empty() and front() methods.
|
||
|
|
template<typename _T, typename _QueueT = std::queue<_T>>
|
||
|
|
class concurrent_queue
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
template<typename _U>
|
||
|
|
void push(_U&& _elem)
|
||
|
|
{
|
||
|
|
{
|
||
|
|
std::lock_guard<decltype(x_mutex)> guard{x_mutex};
|
||
|
|
m_queue.push(std::forward<_U>(_elem));
|
||
|
|
}
|
||
|
|
m_cv.notify_one();
|
||
|
|
}
|
||
|
|
|
||
|
|
_T pop()
|
||
|
|
{
|
||
|
|
std::unique_lock<std::mutex> lock{x_mutex};
|
||
|
|
m_cv.wait(lock, [this]{ return !m_queue.empty(); });
|
||
|
|
auto item = std::move(m_queue.front());
|
||
|
|
m_queue.pop();
|
||
|
|
return item;
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
_QueueT m_queue;
|
||
|
|
std::mutex x_mutex;
|
||
|
|
std::condition_variable m_cv;
|
||
|
|
};
|
||
|
|
|
||
|
|
}
|