devpoll.hpp

/* SPDX-License-Identifier: MPL-2.0 */

#ifndef __ZMQ_DEVPOLL_HPP_INCLUDED__
#define __ZMQ_DEVPOLL_HPP_INCLUDED__

//  poller.hpp decides which polling mechanism to use.
#include "poller.hpp"
#if defined ZMQ_IOTHREAD_POLLER_USE_DEVPOLL

#include <vector>

#include "ctx.hpp"
#include "fd.hpp"
#include "thread.hpp"
#include "poller_base.hpp"

namespace zmq
{
struct i_poll_events;

//  Implements socket polling mechanism using the "/dev/poll" interface.

class devpoll_t ZMQ_FINAL : public worker_poller_base_t
{
  public:
    typedef fd_t handle_t;

    devpoll_t (const thread_ctx_t &ctx_);
    ~devpoll_t () ZMQ_FINAL;

    //  "poller" concept.
    handle_t add_fd (fd_t fd_, zmq::i_poll_events *events_);
    void rm_fd (handle_t handle_);
    void set_pollin (handle_t handle_);
    void reset_pollin (handle_t handle_);
    void set_pollout (handle_t handle_);
    void reset_pollout (handle_t handle_);
    void stop ();

    static int max_fds ();

  private:
    //  Main event loop.
    void loop () ZMQ_FINAL;

    //  File descriptor referring to "/dev/poll" pseudo-device.
    fd_t devpoll_fd;

    struct fd_entry_t
    {
        short events;
        zmq::i_poll_events *reactor;
        bool valid;
        bool accepted;
    };

    typedef std::vector<fd_entry_t> fd_table_t;
    fd_table_t fd_table;

    typedef std::vector<fd_t> pending_list_t;
    pending_list_t pending_list;

    //  Pollset manipulation function.
    void devpoll_ctl (fd_t fd_, short events_);

    ZMQ_NON_COPYABLE_NOR_MOVABLE (devpoll_t)
};

typedef devpoll_t poller_t;
}

#endif

#endif