EventMultiplexer.cpp

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/*
 * SNode.C - a slim toolkit for network communication
 * Copyright (C) Volker Christian <me@vchrist.at>
 *               2020, 2021, 2022, 2023, 2024, 2025
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
 
#include "core/multiplexer/epoll/EventMultiplexer.h"
 
#include "core/multiplexer/epoll/DescriptorEventPublisher.h"
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
#include "log/Logger.h"
#include "utils/Timeval.h"
 
#include <array>
 
#endif /* DOXYGEN_SHOULD_SKIP_THIS */
 
core::EventMultiplexer& EventMultiplexer() {
    static core::multiplexer::epoll::EventMultiplexer eventMultiplexer;
 
    return eventMultiplexer;
}
 
namespace core::multiplexer::epoll {
 
    EventMultiplexer::EventMultiplexer()
        : core::EventMultiplexer(new core::multiplexer::epoll::DescriptorEventPublisher("READ", //
                                                                                        epfds[core::EventMultiplexer::DISP_TYPE::RD],
                                                                                        EPOLLIN,
                                                                                        EPOLLIN | EPOLLHUP | EPOLLRDHUP | EPOLLERR),
                                 new core::multiplexer::epoll::DescriptorEventPublisher("WRITE", //
                                                                                        epfds[core::EventMultiplexer::DISP_TYPE::WR],
                                                                                        EPOLLOUT,
                                                                                        EPOLLOUT),
                                 new core::multiplexer::epoll::DescriptorEventPublisher("EXCEPT", //
                                                                                        epfds[core::EventMultiplexer::DISP_TYPE::EX],
                                                                                        EPOLLPRI,
                                                                                        EPOLLPRI))
        , epfd(core::system::epoll_create1(EPOLL_CLOEXEC)) {
        epoll_event event{};
        event.events = EPOLLIN;
 
        event.data.ptr = descriptorEventPublishers[core::EventMultiplexer::DISP_TYPE::RD];
        core::system::epoll_ctl(epfd, EPOLL_CTL_ADD, epfds[core::EventMultiplexer::DISP_TYPE::RD], &event);
 
        event.data.ptr = descriptorEventPublishers[core::EventMultiplexer::DISP_TYPE::WR];
        core::system::epoll_ctl(epfd, EPOLL_CTL_ADD, epfds[core::EventMultiplexer::DISP_TYPE::WR], &event);
 
        event.data.ptr = descriptorEventPublishers[core::EventMultiplexer::DISP_TYPE::EX];
        core::system::epoll_ctl(epfd, EPOLL_CTL_ADD, epfds[core::EventMultiplexer::DISP_TYPE::EX], &event);
 
        LOG(DEBUG) << "Core::multiplexer: epoll";
    }
 
    int EventMultiplexer::monitorDescriptors(utils::Timeval& tickTimeout, const sigset_t& sigMask) {
        return core::system::epoll_pwait(epfd, ePollEvents, 3, tickTimeout.getMs(), &sigMask);
    }
 
    void EventMultiplexer::spanActiveEvents(int activeDescriptorCount) {
        for (int i = 0; i < activeDescriptorCount; i++) {
            if ((ePollEvents[i].events & EPOLLIN) != 0) {
                static_cast<core::DescriptorEventPublisher*>(ePollEvents[i].data.ptr)->spanActiveEvents();
            }
        }
    }
 
} // namespace core::multiplexer::epoll