io_thread.cpp

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

#include "precompiled.hpp"

#include <new>

#include "macros.hpp"
#include "io_thread.hpp"
#include "err.hpp"
#include "ctx.hpp"

zmq::io_thread_t::io_thread_t (ctx_t *ctx_, uint32_t tid_) :
    object_t (ctx_, tid_),
    _mailbox_handle (static_cast<poller_t::handle_t> (NULL))
{
    _poller = new (std::nothrow) poller_t (*ctx_);
    alloc_assert (_poller);

    if (_mailbox.get_fd () != retired_fd) {
        _mailbox_handle = _poller->add_fd (_mailbox.get_fd (), this);
        _poller->set_pollin (_mailbox_handle);
    }
}

zmq::io_thread_t::~io_thread_t ()
{
    LIBZMQ_DELETE (_poller);
}

void zmq::io_thread_t::start ()
{
    char name[16] = "";
    snprintf (name, sizeof (name), "IO/%u",
              get_tid () - zmq::ctx_t::reaper_tid - 1);
    //  Start the underlying I/O thread.
    _poller->start (name);
}

void zmq::io_thread_t::stop ()
{
    send_stop ();
}

zmq::mailbox_t *zmq::io_thread_t::get_mailbox ()
{
    return &_mailbox;
}

int zmq::io_thread_t::get_load () const
{
    return _poller->get_load ();
}

void zmq::io_thread_t::in_event ()
{
    //  TODO: Do we want to limit number of commands I/O thread can
    //  process in a single go?

    command_t cmd;
    int rc = _mailbox.recv (&cmd, 0);

    while (rc == 0 || errno == EINTR) {
        if (rc == 0)
            cmd.destination->process_command (cmd);
        rc = _mailbox.recv (&cmd, 0);
    }

    errno_assert (rc != 0 && errno == EAGAIN);
}

void zmq::io_thread_t::out_event ()
{
    //  We are never polling for POLLOUT here. This function is never called.
    zmq_assert (false);
}

void zmq::io_thread_t::timer_event (int)
{
    //  No timers here. This function is never called.
    zmq_assert (false);
}

zmq::poller_t *zmq::io_thread_t::get_poller () const
{
    zmq_assert (_poller);
    return _poller;
}

void zmq::io_thread_t::process_stop ()
{
    zmq_assert (_mailbox_handle);
    _poller->rm_fd (_mailbox_handle);
    _poller->stop ();
}