//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#pragma once
#include "td/utils/port/config.h"
#ifdef TD_POLL_KQUEUE
#include "td/utils/common.h"
#include "td/utils/port/Fd.h"
#include "td/utils/port/PollBase.h"
#include <cstdint>
#include <sys/event.h>
namespace td {
namespace detail {
class KQueue final : public PollBase {
public:
KQueue();
KQueue(const KQueue &) = delete;
KQueue &operator=(const KQueue &) = delete;
KQueue(KQueue &&) = delete;
KQueue &operator=(KQueue &&) = delete;
~KQueue() override;
void init() override;
void clear() override;
void subscribe(const Fd &fd, Fd::Flags flags) override;
void unsubscribe(const Fd &fd) override;
void unsubscribe_before_close(const Fd &fd) override;
void run(int timeout_ms) override;
private:
vector<struct kevent> events;
int changes_n;
int kq;
int update(int nevents, const timespec *timeout, bool may_fail = false);
void invalidate(const Fd &fd);
void flush_changes(bool may_fail = false);
void add_change(std::uintptr_t ident, int16 filter, uint16 flags, uint32 fflags, std::intptr_t data, void *udata);
};
} // namespace detail
} // namespace td
#endif
