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/*
Copyright (c) 2009-2012 250bpm s.r.o.
Copyright (c) 2007-2009 iMatix Corporation
Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
This file is part of Crossroads I/O project.
Crossroads I/O 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.
Crossroads 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 "poll.hpp"
#if defined XS_USE_ASYNC_POLL
#include <algorithm>
#include "err.hpp"
#include "config.hpp"
xs::poll_t::poll_t (xs::ctx_t *ctx_, uint32_t tid_) :
io_thread_t (ctx_, tid_),
retired (false),
stopping (false)
{
}
xs::poll_t::~poll_t ()
{
thread_stop (&worker);
}
xs::handle_t xs::poll_t::add_fd (fd_t fd_, i_poll_events *events_)
{
// 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].index = retired_fd;
++sz;
}
}
pollfd pfd = {fd_, 0, 0};
pollset.push_back (pfd);
assert (fd_table [fd_].index == retired_fd);
fd_table [fd_].index = pollset.size() - 1;
fd_table [fd_].events = events_;
// Increase the load metric of the thread.
adjust_load (1);
return fdtoptr (fd_);
}
void xs::poll_t::rm_fd (handle_t handle_)
{
int index = fd_table [ptrtofd (handle_)].index;
assert (index != retired_fd);
// Mark the fd as unused.
pollset [index].fd = retired_fd;
fd_table [ptrtofd (handle_)].index = retired_fd;
retired = true;
// Decrease the load metric of the thread.
adjust_load (-1);
}
void xs::poll_t::set_pollin (handle_t handle_)
{
int index = fd_table [ptrtofd (handle_)].index;
pollset [index].events |= POLLIN;
}
void xs::poll_t::reset_pollin (handle_t handle_)
{
int index = fd_table [ptrtofd (handle_)].index;
pollset [index].events &= ~((short) POLLIN);
}
void xs::poll_t::set_pollout (handle_t handle_)
{
int index = fd_table [ptrtofd (handle_)].index;
pollset [index].events |= POLLOUT;
}
void xs::poll_t::reset_pollout (handle_t handle_)
{
int index = fd_table [ptrtofd (handle_)].index;
pollset [index].events &= ~((short) POLLOUT);
}
void xs::poll_t::xstart ()
{
thread_start (&worker, worker_routine, this);
}
void xs::poll_t::xstop ()
{
stopping = true;
}
void xs::poll_t::loop ()
{
while (!stopping) {
// Execute any due timers.
int timeout = (int) execute_timers ();
// Wait for events.
int rc = poll (&pollset [0], pollset.size (), timeout ? timeout : -1);
if (rc == -1 && errno == EINTR)
continue;
errno_assert (rc != -1);
// If there are no events (i.e. it's a timeout) there's no point
// in checking the pollset.
if (rc == 0)
continue;
for (pollset_t::size_type i = 0; i != pollset.size (); i++) {
xs_assert (!(pollset [i].revents & POLLNVAL));
if (pollset [i].fd == retired_fd)
continue;
if (pollset [i].revents & (POLLERR | POLLHUP))
fd_table [pollset [i].fd].events->in_event (pollset [i].fd);
if (pollset [i].fd == retired_fd)
continue;
if (pollset [i].revents & POLLOUT)
fd_table [pollset [i].fd].events->out_event (pollset [i].fd);
if (pollset [i].fd == retired_fd)
continue;
if (pollset [i].revents & POLLIN)
fd_table [pollset [i].fd].events->in_event (pollset [i].fd);
}
// Clean up the pollset and update the fd_table accordingly.
if (retired) {
pollset_t::size_type i = 0;
while (i < pollset.size ()) {
if (pollset [i].fd == retired_fd)
pollset.erase (pollset.begin () + i);
else {
fd_table [pollset [i].fd].index = i;
i ++;
}
}
retired = false;
}
}
}
void xs::poll_t::worker_routine (void *arg_)
{
((poll_t*) arg_)->loop ();
}
#endif
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