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/*
Copyright (c) 2007-2013 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 "devpoll.hpp"
#if defined ZMQ_USE_DEVPOLL
#include <sys/devpoll.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <unistd.h>
#include <limits.h>
#include <algorithm>
#include "devpoll.hpp"
#include "err.hpp"
#include "config.hpp"
#include "i_poll_events.hpp"
zmq::devpoll_t::devpoll_t () :
stopping (false)
{
devpoll_fd = open ("/dev/poll", O_RDWR);
errno_assert (devpoll_fd != -1);
}
zmq::devpoll_t::~devpoll_t ()
{
worker.stop ();
close (devpoll_fd);
}
void zmq::devpoll_t::devpoll_ctl (fd_t fd_, short events_)
{
struct pollfd pfd = {fd_, events_, 0};
ssize_t rc = write (devpoll_fd, &pfd, sizeof pfd);
zmq_assert (rc == sizeof pfd);
}
zmq::devpoll_t::handle_t zmq::devpoll_t::add_fd (fd_t fd_,
i_poll_events *reactor_)
{
// If the file descriptor table is too small expand it.
fd_table_t::size_type sz = fd_table.size ();
if (sz <= (fd_table_t::size_type) fd_) {
fd_table.resize (fd_ + 1);
while (sz != (fd_table_t::size_type) (fd_ + 1)) {
fd_table [sz].valid = false;
++sz;
}
}
zmq_assert (!fd_table [fd_].valid);
fd_table [fd_].events = 0;
fd_table [fd_].reactor = reactor_;
fd_table [fd_].valid = true;
fd_table [fd_].accepted = false;
devpoll_ctl (fd_, 0);
pending_list.push_back (fd_);
// Increase the load metric of the thread.
adjust_load (1);
return fd_;
}
void zmq::devpoll_t::rm_fd (handle_t handle_)
{
zmq_assert (fd_table [handle_].valid);
devpoll_ctl (handle_, POLLREMOVE);
fd_table [handle_].valid = false;
// Decrease the load metric of the thread.
adjust_load (-1);
}
void zmq::devpoll_t::set_pollin (handle_t handle_)
{
devpoll_ctl (handle_, POLLREMOVE);
fd_table [handle_].events |= POLLIN;
devpoll_ctl (handle_, fd_table [handle_].events);
}
void zmq::devpoll_t::reset_pollin (handle_t handle_)
{
devpoll_ctl (handle_, POLLREMOVE);
fd_table [handle_].events &= ~((short) POLLIN);
devpoll_ctl (handle_, fd_table [handle_].events);
}
void zmq::devpoll_t::set_pollout (handle_t handle_)
{
devpoll_ctl (handle_, POLLREMOVE);
fd_table [handle_].events |= POLLOUT;
devpoll_ctl (handle_, fd_table [handle_].events);
}
void zmq::devpoll_t::reset_pollout (handle_t handle_)
{
devpoll_ctl (handle_, POLLREMOVE);
fd_table [handle_].events &= ~((short) POLLOUT);
devpoll_ctl (handle_, fd_table [handle_].events);
}
void zmq::devpoll_t::start ()
{
worker.start (worker_routine, this);
}
void zmq::devpoll_t::stop ()
{
stopping = true;
}
int zmq::devpoll_t::max_fds ()
{
return -1;
}
void zmq::devpoll_t::loop ()
{
while (!stopping) {
struct pollfd ev_buf [max_io_events];
struct dvpoll poll_req;
for (pending_list_t::size_type i = 0; i < pending_list.size (); i ++)
fd_table [pending_list [i]].accepted = true;
pending_list.clear ();
// Execute any due timers.
int timeout = (int) execute_timers ();
// Wait for events.
// On Solaris, we can retrieve no more then (OPEN_MAX - 1) events.
poll_req.dp_fds = &ev_buf [0];
#if defined ZMQ_HAVE_SOLARIS
poll_req.dp_nfds = std::min ((int) max_io_events, OPEN_MAX - 1);
#else
poll_req.dp_nfds = max_io_events;
#endif
poll_req.dp_timeout = timeout ? timeout : -1;
int n = ioctl (devpoll_fd, DP_POLL, &poll_req);
if (n == -1 && errno == EINTR)
continue;
errno_assert (n != -1);
for (int i = 0; i < n; i ++) {
fd_entry_t *fd_ptr = &fd_table [ev_buf [i].fd];
if (!fd_ptr->valid || !fd_ptr->accepted)
continue;
if (ev_buf [i].revents & (POLLERR | POLLHUP))
fd_ptr->reactor->in_event ();
if (!fd_ptr->valid || !fd_ptr->accepted)
continue;
if (ev_buf [i].revents & POLLOUT)
fd_ptr->reactor->out_event ();
if (!fd_ptr->valid || !fd_ptr->accepted)
continue;
if (ev_buf [i].revents & POLLIN)
fd_ptr->reactor->in_event ();
}
}
}
void zmq::devpoll_t::worker_routine (void *arg_)
{
((devpoll_t*) arg_)->loop ();
}
#endif
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