EventMultiplexer.h

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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/>.
 */
 
#ifndef CORE_POLL_EVENTDISPATCHER_H
#define CORE_POLL_EVENTDISPATCHER_H
 
#include "core/EventMultiplexer.h" // IWYU pragma: export
 
namespace core {
    class DescriptorEventReceiver;
}
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
#include "core/system/poll.h" // IWYU pragma: export
 
#include <unordered_map>
#include <vector>
 
#endif /* DOXYGEN_SHOULD_SKIP_THIS */
 
namespace core::multiplexer::poll {
 
    class PollFdsManager {
    public:
        struct PollFdIndex {
            std::vector<pollfd>::size_type index;
            short events; // cppcheck-suppress unusedStructMember
        };
 
        explicit PollFdsManager();
 
        void muxAdd(core::DescriptorEventReceiver* eventReceiver, short event);
        void muxDel(int fd, short event);
        void muxOn(const core::DescriptorEventReceiver* eventReceiver, short event);
        void muxOff(const DescriptorEventReceiver* eventReceiver, short event);
 
        pollfd* getEvents();
 
        const std::unordered_map<int, PollFdIndex>& getPollFdIndices() const;
 
        nfds_t getCurrentSize() const;
 
    private:
        nfds_t nextIndex = 0;
        void compress();
 
        std::vector<pollfd> pollfds;
        std::unordered_map<int, PollFdIndex> pollFdIndices;
    };
 
    class EventMultiplexer : public core::EventMultiplexer {
    public:
        EventMultiplexer();
        ~EventMultiplexer() override = default;
 
    private:
        int monitorDescriptors(utils::Timeval& tickTimeOut, const sigset_t& sigMask) override;
        void spanActiveEvents(int activeDescriptorCount) override;
 
        PollFdsManager pollFdsManager;
    };
 
} // namespace core::multiplexer::poll
 
#endif // CORE_POLL_EVENTDISPATCHER_H