108 lines
2.9 KiB
C++
108 lines
2.9 KiB
C++
/*
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* AsioReactor.h
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*
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* This source file is part of the FoundationDB open source project
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*
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* Copyright 2013-2022 Apple Inc. and the FoundationDB project authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef FLOW_ASIOREACTOR_H
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#define FLOW_ASIOREACTOR_H
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#pragma once
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#include <boost/asio.hpp>
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#include <boost/bind/bind.hpp>
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#include "flow/flow.h"
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namespace N2 { // No indent, it's the whole file
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class Net2;
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class Peer;
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class Connection;
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class ASIOReactor {
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public:
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explicit ASIOReactor(Net2*);
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void sleep(double timeout);
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void react();
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void wake();
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boost::asio::io_service ios;
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boost::asio::io_service::work
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do_not_stop; // Reactor needs to keep running when there is nothing to do until stopped explicitly
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private:
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Net2* network;
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boost::asio::deadline_timer firstTimer;
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static void nullWaitHandler(const boost::system::error_code&) {}
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static void nullCompletionHandler() {}
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#ifdef __linux__
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class EventFD : public IEventFD {
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int fd;
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boost::asio::posix::stream_descriptor sd;
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int64_t fdVal;
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static void handle_read(Promise<int64_t> p,
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int64_t* pVal,
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const boost::system::error_code& ec,
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std::size_t bytes_transferred) {
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if (ec)
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return; // Presumably, the EventFD was destroyed?
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ASSERT(bytes_transferred == sizeof(*pVal));
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p.send(*pVal);
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}
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public:
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EventFD(ASIOReactor* reactor) : sd(reactor->ios, open()) {}
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~EventFD() override {
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sd.close(); // Also closes the fd, I assume...
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}
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int getFD() override { return fd; }
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Future<int64_t> read() override {
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Promise<int64_t> p;
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sd.async_read_some(boost::asio::mutable_buffers_1(&fdVal, sizeof(fdVal)),
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boost::bind(&EventFD::handle_read,
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p,
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&fdVal,
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boost::asio::placeholders::error,
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boost::asio::placeholders::bytes_transferred));
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return p.getFuture();
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}
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int open() {
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fd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
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if (fd < 0) {
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TraceEvent(SevError, "EventfdError").GetLastError();
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throw platform_error();
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}
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return fd;
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}
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};
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public:
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static IEventFD* getEventFD() { return static_cast<IEventFD*>((void*)g_network->global(INetwork::enEventFD)); }
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static EventFD* newEventFD(ASIOReactor& reactor) { return new EventFD(&reactor); }
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#endif
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};
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} // namespace N2
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#endif
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