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/*
Copyright (c) 2007-2009 FastMQ Inc.
This file is part of 0MQ.
0MQ is free software; you can redistribute it and/or modify it under
the terms of the Lesser GNU 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
Lesser GNU General Public License for more details.
You should have received a copy of the Lesser GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "platform.hpp"
#ifdef ZS_HAVE_LINUX
#include <sys/epoll.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <algorithm>
#include "epoll.hpp"
#include "err.hpp"
#include "config.hpp"
#include "i_poll_events.hpp"
zs::epoll_t::epoll_t () :
stopping (false)
{
epoll_fd = epoll_create (1);
errno_assert (epoll_fd != -1);
}
zs::epoll_t::~epoll_t ()
{
close (epoll_fd);
for (retired_t::iterator it = retired.begin (); it != retired.end (); it ++)
delete *it;
}
zs::handle_t zs::epoll_t::add_fd (fd_t fd_, i_poll_events *events_)
{
poll_entry_t *pe = new poll_entry_t;
zs_assert (pe != NULL);
// The memset is not actually needed. It's here to prevent debugging
// tools to complain about using uninitialised memory.
memset (pe, 0, sizeof (poll_entry_t));
pe->fd = fd_;
pe->ev.events = 0;
pe->ev.data.ptr = pe;
pe->events = events_;
int rc = epoll_ctl (epoll_fd, EPOLL_CTL_ADD, fd_, &pe->ev);
errno_assert (rc != -1);
// Increase the load metric of the thread.
load.add (1);
handle_t handle;
handle.ptr = pe;
return handle;
}
void zs::epoll_t::rm_fd (handle_t handle_)
{
poll_entry_t *pe = (poll_entry_t*) handle_.ptr;
int rc = epoll_ctl (epoll_fd, EPOLL_CTL_DEL, pe->fd, &pe->ev);
errno_assert (rc != -1);
pe->fd = retired_fd;
retired.push_back (pe);
// Decrease the load metric of the thread.
load.sub (1);
}
void zs::epoll_t::set_pollin (handle_t handle_)
{
poll_entry_t *pe = (poll_entry_t*) handle_.ptr;
pe->ev.events |= EPOLLIN;
int rc = epoll_ctl (epoll_fd, EPOLL_CTL_MOD, pe->fd, &pe->ev);
errno_assert (rc != -1);
}
void zs::epoll_t::reset_pollin (handle_t handle_)
{
poll_entry_t *pe = (poll_entry_t*) handle_.ptr;
pe->ev.events &= ~((short) EPOLLIN);
int rc = epoll_ctl (epoll_fd, EPOLL_CTL_MOD, pe->fd, &pe->ev);
errno_assert (rc != -1);
}
void zs::epoll_t::set_pollout (handle_t handle_)
{
poll_entry_t *pe = (poll_entry_t*) handle_.ptr;
pe->ev.events |= EPOLLOUT;
int rc = epoll_ctl (epoll_fd, EPOLL_CTL_MOD, pe->fd, &pe->ev);
errno_assert (rc != -1);
}
void zs::epoll_t::reset_pollout (handle_t handle_)
{
poll_entry_t *pe = (poll_entry_t*) handle_.ptr;
pe->ev.events &= ~((short) EPOLLOUT);
int rc = epoll_ctl (epoll_fd, EPOLL_CTL_MOD, pe->fd, &pe->ev);
errno_assert (rc != -1);
}
void zs::epoll_t::add_timer (i_poll_events *events_)
{
timers.push_back (events_);
}
void zs::epoll_t::cancel_timer (i_poll_events *events_)
{
timers_t::iterator it = std::find (timers.begin (), timers.end (), events_);
if (it == timers.end ())
return;
timers.erase (it);
}
int zs::epoll_t::get_load ()
{
return load.get ();
}
void zs::epoll_t::start ()
{
worker.start (worker_routine, this);
}
void zs::epoll_t::stop ()
{
stopping = true;
}
void zs::epoll_t::join ()
{
worker.stop ();
}
void zs::epoll_t::loop ()
{
epoll_event ev_buf [max_io_events];
while (!stopping) {
// Wait for events.
int n;
while (true) {
n = epoll_wait (epoll_fd, &ev_buf [0], max_io_events,
timers.empty () ? -1 : max_timer_period);
if (!(n == -1 && errno == EINTR)) {
errno_assert (n != -1);
break;
}
}
// Handle timer.
if (!n) {
// Use local list of timers as timer handlers may fill new timers
// into the original array.
timers_t t;
std::swap (timers, t);
// Trigger all the timers.
for (timers_t::iterator it = t.begin (); it != t.end (); it ++)
(*it)->timer_event ();
continue;
}
for (int i = 0; i < n; i ++) {
poll_entry_t *pe = ((poll_entry_t*) ev_buf [i].data.ptr);
if (pe->fd == retired_fd)
continue;
if (ev_buf [i].events & (EPOLLERR | EPOLLHUP))
pe->events->in_event ();
if (pe->fd == retired_fd)
continue;
if (ev_buf [i].events & EPOLLOUT)
pe->events->out_event ();
if (pe->fd == retired_fd)
continue;
if (ev_buf [i].events & EPOLLIN)
pe->events->in_event ();
}
// Destroy retired event sources.
for (retired_t::iterator it = retired.begin (); it != retired.end ();
it ++)
delete *it;
retired.clear ();
}
}
void zs::epoll_t::worker_routine (void *arg_)
{
((epoll_t*) arg_)->loop ();
}
#endif
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