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+/*
+ Copyright (c) 2007-2010 iMatix Corporation
+
+ 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/>.
+*/
+
+#ifndef __ZMQ_EPOLL_HPP_INCLUDED__
+#define __ZMQ_EPOLL_HPP_INCLUDED__
+
+#include "platform.hpp"
+
+#ifdef ZMQ_HAVE_LINUX
+
+#include <vector>
+#include <sys/epoll.h>
+
+#include "fd.hpp"
+#include "thread.hpp"
+#include "atomic_counter.hpp"
+
+namespace zmq
+{
+
+ // This class implements socket polling mechanism using the Linux-specific
+ // epoll mechanism.
+
+ class epoll_t
+ {
+ public:
+
+ typedef void* handle_t;
+
+ epoll_t ();
+ ~epoll_t ();
+
+ // "poller" concept.
+ handle_t add_fd (fd_t fd_, struct i_poll_events *events_);
+ void rm_fd (handle_t handle_);
+ void set_pollin (handle_t handle_);
+ void reset_pollin (handle_t handle_);
+ void set_pollout (handle_t handle_);
+ void reset_pollout (handle_t handle_);
+ void add_timer (struct i_poll_events *events_);
+ void cancel_timer (struct i_poll_events *events_);
+ int get_load ();
+ void start ();
+ void stop ();
+
+ private:
+
+ // Main worker thread routine.
+ static void worker_routine (void *arg_);
+
+ // Main event loop.
+ void loop ();
+
+ // Main epoll file descriptor
+ fd_t epoll_fd;
+
+ struct poll_entry_t
+ {
+ fd_t fd;
+ epoll_event ev;
+ struct i_poll_events *events;
+ };
+
+ // List of retired event sources.
+ typedef std::vector <poll_entry_t*> retired_t;
+ retired_t retired;
+
+ // List of all the engines waiting for the timer event.
+ typedef std::vector <struct i_poll_events*> timers_t;
+ timers_t timers;
+
+ // If true, thread is in the process of shutting down.
+ bool stopping;
+
+ // Handle of the physical thread doing the I/O work.
+ thread_t worker;
+
+ // Load of the poller. Currently number of file descriptors
+ // registered with the poller.
+ atomic_counter_t load;
+
+ epoll_t (const epoll_t&);
+ void operator = (const epoll_t&);
+ };
+
+}
+
+#endif
+
+#endif