event_dispatcher_poll.h

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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2019, Google Inc.
 *
 * Poll-based event dispatcher
 */

#pragma once

#include <list>
#include <map>
#include <vector>

#include <libcamera/base/private.h>

#include <libcamera/base/event_dispatcher.h>
#include <libcamera/base/unique_fd.h>

struct pollfd;

namespace libcamera {

class EventNotifier;
class Timer;

class EventDispatcherPoll final : public EventDispatcher
{
public:
    EventDispatcherPoll();
    ~EventDispatcherPoll();

    void registerEventNotifier(EventNotifier *notifier);
    void unregisterEventNotifier(EventNotifier *notifier);

    void registerTimer(Timer *timer);
    void unregisterTimer(Timer *timer);

    void processEvents();
    void interrupt();

private:
    struct EventNotifierSetPoll {
        short events() const;
        EventNotifier *notifiers[3];
    };

    int poll(std::vector<struct pollfd> *pollfds);
    void processInterrupt(const struct pollfd &pfd);
    void processNotifiers(const std::vector<struct pollfd> &pollfds);
    void processTimers();

    std::map<int, EventNotifierSetPoll> notifiers_;
    std::list<Timer *> timers_;
    UniqueFD eventfd_;

    bool processingEvents_;
};

} /* namespace libcamera */