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#ifndef theplu_yat_utility_queue |
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#define theplu_yat_utility_queue |
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|
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// $Id$ |
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/* |
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Copyright (C) 2013, 2014, 2016, 2017, 2018, 2020, 2023 Peter Johansson |
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This file is part of the yat library, https://dev.thep.lu.se/yat |
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|
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The yat library is free software; you can redistribute it and/or |
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modify it under the terms of the GNU General Public License as |
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published by the Free Software Foundation; either version 3 of the |
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License, or (at your option) any later version. |
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|
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The yat 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 GNU |
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General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with yat. If not, see <https://www.gnu.org/licenses/>. |
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*/ |
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|
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#include "BasicQueue.h" |
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#include "utility.h" |
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#include "yat_assert.h" |
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|
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#include <deque> |
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#include <mutex> |
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#include <utility> |
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|
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namespace theplu { |
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namespace yat { |
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namespace utility { |
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|
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/** |
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\brief Multi-thread safe queue |
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|
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This class provides a multi-thread safe queue. The Queue is |
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typically shared by multiple threads such that some threads push |
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elements and some pop elements. The Queue is a "first in first |
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out" container and holds the same functionality as the similar |
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<a href="http://www.sgi.com/tech/stl/queue.html">std::queue</a>. The |
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difference is that Queue is multi-thread safe, in other words, |
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when one thread access the Queue, other threads are locked out |
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from access so that only one thread touches the Queue at a time |
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and its behaviour is well defined. In a single-thread application |
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there is no point in using the class as std::queue should be |
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prefereble. |
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|
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\note Copy constructor and assignment are available but they are |
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not thread safe in the current implementation. |
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|
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\since New in yat 0.11 |
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|
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\see Boost Library provides a |
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<a href="http://www.boost.org/doc/libs/1_55_0/doc/html/lockfree.html"> |
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lock-free queue</a> |
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*/ |
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template<typename T> |
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class Queue : |
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public detail::BasicQueue<Queue<T>, T, std::deque<T> > |
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{ |
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friend class detail::BasicQueue<Queue<T>, T, std::deque<T> >; |
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typedef detail::BasicQueue<Queue<T>, T, std::deque<T> > Base; |
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public: |
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/** |
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\brief Create a Queue with no elements |
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*/ |
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Queue(void) {} |
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|
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/** |
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\brief Copy constructor |
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*/ |
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Queue(const Queue& other) |
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: Base(other) {} |
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|
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/** |
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\brief assignment operator |
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*/ |
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Queue& operator=(const Queue& lhs) |
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{ |
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this->assign(lhs); |
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return *this; |
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} |
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|
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private: |
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void pop_impl(T& value, std::unique_lock<std::mutex>& lock) |
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{ |
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YAT_ASSERT(this->q_.size()); |
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value = std::move_if_noexcept(this->q_.front()); |
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this->q_.pop_front(); |
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} |
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|
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|
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void push_impl(const T& value, std::unique_lock<std::mutex>& lock) |
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{ |
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this->q_.push_back(value); |
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} |
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|
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|
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void push_impl(T&& value, std::unique_lock<std::mutex>& lock) |
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{ |
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this->q_.push_back(std::move(value)); |
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} |
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}; |
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|
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}}} |
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#endif |