mirror of
https://github.com/matrix-construct/construct
synced 2024-10-30 02:18:58 +01:00
142 lines
2.4 KiB
C++
142 lines
2.4 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_CTX_QUEUE_H
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namespace ircd::ctx
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{
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template<class T> class queue;
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}
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template<class T>
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class ircd::ctx::queue
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{
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struct dock dock;
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std::queue<T> q;
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public:
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auto empty() const { return q.empty(); }
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auto size() const { return q.size(); }
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// Consumer interface; waits for item and std::move() it off the queue
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template<class time_point> T pop_until(time_point&&);
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template<class duration> T pop_for(const duration &);
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T pop();
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// Producer interface; emplace item on the queue and notify consumer
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template<class... args> void emplace(args&&...);
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void push(const T &);
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void push(T &&) noexcept;
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queue() = default;
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~queue() noexcept;
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};
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template<class T>
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ircd::ctx::queue<T>::~queue()
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noexcept
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{
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assert(q.empty());
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}
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template<class T>
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void
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ircd::ctx::queue<T>::push(T &&t)
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noexcept
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{
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q.push(std::move(t));
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dock.notify();
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}
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template<class T>
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void
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ircd::ctx::queue<T>::push(const T &t)
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{
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q.push(t);
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dock.notify();
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}
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template<class T>
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template<class... args>
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void
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ircd::ctx::queue<T>::emplace(args&&... a)
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{
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q.emplace(std::forward<args>(a)...);
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dock.notify();
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}
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template<class T>
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T
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ircd::ctx::queue<T>::pop()
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{
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dock.wait([this]
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{
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return !q.empty();
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});
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const unwind pop([this]
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{
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q.pop();
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});
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auto &ret(q.front());
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return std::move(ret);
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}
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template<class T>
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template<class duration>
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T
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ircd::ctx::queue<T>::pop_for(const duration &dur)
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{
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const bool ready
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{
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dock.wait_for(dur, [this]
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{
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return !q.empty();
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})
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};
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if(!ready)
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throw timeout{};
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const unwind pop([this]
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{
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q.pop();
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});
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auto &ret(q.front());
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return std::move(ret);
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}
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template<class T>
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template<class time_point>
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T
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ircd::ctx::queue<T>::pop_until(time_point&& tp)
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{
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const bool ready
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{
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dock.wait_until(tp, [this]
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{
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return !q.empty();
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})
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};
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if(!ready)
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throw timeout{};
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const unwind pop([this]
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{
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q.pop();
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});
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auto &ret(q.front());
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return std::move(ret);
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}
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