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/*
Copyright (c) 2009-2011 250bpm s.r.o.
Copyright (c) 2007-2011 iMatix Corporation
Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
This file is part of 0MQ.
0MQ 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.
0MQ 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/>.
*/
#include "kqueue.hpp"
#if defined ZMQ_USE_KQUEUE
#include <sys/time.h>
#include <sys/types.h>
#include <sys/event.h>
#include <stdlib.h>
#include <unistd.h>
#include <algorithm>
#include <new>
#include "kqueue.hpp"
#include "err.hpp"
#include "config.hpp"
#include "i_poll_events.hpp"
#include "likely.hpp"
// NetBSD defines (struct kevent).udata as intptr_t, everyone else
// as void *.
#if defined ZMQ_HAVE_NETBSD
#define kevent_udata_t intptr_t
#else
#define kevent_udata_t void *
#endif
zmq::kqueue_t::kqueue_t () :
stopping (false)
{
// Create event queue
kqueue_fd = kqueue ();
errno_assert (kqueue_fd != -1);
}
zmq::kqueue_t::~kqueue_t ()
{
worker.stop ();
close (kqueue_fd);
}
void zmq::kqueue_t::kevent_add (fd_t fd_, short filter_, void *udata_)
{
struct kevent ev;
EV_SET (&ev, fd_, filter_, EV_ADD, 0, 0, (kevent_udata_t)udata_);
int rc = kevent (kqueue_fd, &ev, 1, NULL, 0, NULL);
errno_assert (rc != -1);
}
void zmq::kqueue_t::kevent_delete (fd_t fd_, short filter_)
{
struct kevent ev;
EV_SET (&ev, fd_, filter_, EV_DELETE, 0, 0, 0);
int rc = kevent (kqueue_fd, &ev, 1, NULL, 0, NULL);
errno_assert (rc != -1);
}
zmq::kqueue_t::handle_t zmq::kqueue_t::add_fd (fd_t fd_,
i_poll_events *reactor_)
{
poll_entry_t *pe = new (std::nothrow) poll_entry_t;
alloc_assert (pe);
pe->fd = fd_;
pe->flag_pollin = 0;
pe->flag_pollout = 0;
pe->reactor = reactor_;
adjust_load (1);
return pe;
}
void zmq::kqueue_t::rm_fd (handle_t handle_)
{
poll_entry_t *pe = (poll_entry_t*) handle_;
if (pe->flag_pollin)
kevent_delete (pe->fd, EVFILT_READ);
if (pe->flag_pollout)
kevent_delete (pe->fd, EVFILT_WRITE);
pe->fd = retired_fd;
retired.push_back (pe);
adjust_load (-1);
}
void zmq::kqueue_t::set_pollin (handle_t handle_)
{
poll_entry_t *pe = (poll_entry_t*) handle_;
if (likely (!pe->flag_pollin)) {
pe->flag_pollin = true;
kevent_add (pe->fd, EVFILT_READ, pe);
}
}
void zmq::kqueue_t::reset_pollin (handle_t handle_)
{
poll_entry_t *pe = (poll_entry_t*) handle_;
if (likely (pe->flag_pollin)) {
pe->flag_pollin = false;
kevent_delete (pe->fd, EVFILT_READ);
}
}
void zmq::kqueue_t::set_pollout (handle_t handle_)
{
poll_entry_t *pe = (poll_entry_t*) handle_;
if (likely (!pe->flag_pollout)) {
pe->flag_pollout = true;
kevent_add (pe->fd, EVFILT_WRITE, pe);
}
}
void zmq::kqueue_t::reset_pollout (handle_t handle_)
{
poll_entry_t *pe = (poll_entry_t*) handle_;
if (likely (pe->flag_pollout)) {
pe->flag_pollout = false;
kevent_delete (pe->fd, EVFILT_WRITE);
}
}
void zmq::kqueue_t::start ()
{
worker.start (worker_routine, this);
}
void zmq::kqueue_t::stop ()
{
stopping = true;
}
void zmq::kqueue_t::loop ()
{
while (!stopping) {
// Execute any due timers.
int timeout = (int) execute_timers ();
// Wait for events.
struct kevent ev_buf [max_io_events];
timespec ts = {timeout / 1000, (timeout % 1000) * 1000000};
int n = kevent (kqueue_fd, NULL, 0, &ev_buf [0], max_io_events,
timeout ? &ts: NULL);
if (n == -1 && errno == EINTR)
continue;
errno_assert (n != -1);
for (int i = 0; i < n; i ++) {
poll_entry_t *pe = (poll_entry_t*) ev_buf [i].udata;
if (pe->fd == retired_fd)
continue;
if (ev_buf [i].flags & EV_EOF)
pe->reactor->in_event ();
if (pe->fd == retired_fd)
continue;
if (ev_buf [i].filter == EVFILT_WRITE)
pe->reactor->out_event ();
if (pe->fd == retired_fd)
continue;
if (ev_buf [i].filter == EVFILT_READ)
pe->reactor->in_event ();
}
// Destroy retired event sources.
for (retired_t::iterator it = retired.begin (); it != retired.end ();
++it)
delete *it;
retired.clear ();
}
}
void zmq::kqueue_t::worker_routine (void *arg_)
{
((kqueue_t*) arg_)->loop ();
}
#endif
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