94 lines
3 KiB
C++
94 lines
3 KiB
C++
#pragma once
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// Author: Torarin Hals Bakke (2012)
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// Boost Software License - Version 1.0 - August 17th, 2003
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// Permission is hereby granted, free of charge, to any person or organization
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// obtaining a copy of the software and accompanying documentation covered by
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// this license (the "Software") to use, reproduce, display, distribute,
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// execute, and transmit the Software, and to prepare derivative works of the
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// Software, and to permit third-parties to whom the Software is furnished to
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// do so, all subject to the following:
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// The copyright notices in the Software and this entire statement, including
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// the above license grant, this restriction and the following disclaimer,
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// must be included in all copies of the Software, in whole or in part, and
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// all derivative works of the Software, unless such copies or derivative
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// works are solely in the form of machine-executable object code generated by
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// a source language processor.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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#include <type_traits>
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#include <utility>
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#include <deque>
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#include <mutex>
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#include <condition_variable>
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#include "variant.hpp"
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#include "LockBlock.h"
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#include "FunctorVisitor.h"
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template <typename... Ts>
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class Mailbox {
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public:
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template <typename T>
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void send(T&& msg) {
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LOCK_BLOCK (messages_lock_) {
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messages_.push_back(std::forward<T>(msg));
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messages_cond_.notify_one();
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}
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}
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template <typename... Funs>
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void receive(Funs&&... funs) {
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for (;;) {
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LOCK_BLOCK (messages_lock_)
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if (messages_.empty()) break;
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auto extract_message = [&]() {
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LOCK_BLOCK (messages_lock_) {
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utils::variant<Ts...> msg(std::move(messages_.front()));
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messages_.pop_front();
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return msg;
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}
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assert(0);
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};
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utils::apply_visitor(functor_visitor<Funs&...>(funs...),
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extract_message());
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}
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}
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template <typename Rep, typename Period, typename... Funs>
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void receive_wait(const std::chrono::duration<Rep, Period>& rel_time,
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Funs&&... funs)
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{
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{
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std::unique_lock<std::mutex> lock(messages_lock_);
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if (!messages_cond_.wait_for(lock,
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rel_time,
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[&]{return !messages_.empty();}))
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return;
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}
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receive(std::forward<Funs>(funs)...);
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}
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void clear() {
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LOCK_BLOCK(messages_lock_)
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messages_.clear();
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}
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private:
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std::deque<utils::variant<Ts...>> messages_;
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std::mutex messages_lock_;
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std::condition_variable messages_cond_;
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};
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