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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