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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 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/>.
+*/
+
+#ifndef __ZMQ_POLLER_BASE_HPP_INCLUDED__
+#define __ZMQ_POLLER_BASE_HPP_INCLUDED__
+
+#include <map>
+
+#include "clock.hpp"
+#include "atomic_counter.hpp"
+
+namespace zmq
+{
+
+ class poller_base_t
+ {
+ public:
+
+ poller_base_t ();
+ virtual ~poller_base_t ();
+
+ // Returns load of the poller. Note that this function can be
+ // invoked from a different thread!
+ int get_load ();
+
+ // Add a timeout to expire in timeout_ milliseconds. After the
+ // expiration timer_event on sink_ object will be called with
+ // argument set to id_.
+ void add_timer (int timeout_, struct i_poll_events *sink_, int id_);
+
+ // Cancel the timer created by sink_ object with ID equal to id_.
+ void cancel_timer (struct i_poll_events *sink_, int id_);
+
+ protected:
+
+ // Called by individual poller implementations to manage the load.
+ void adjust_load (int amount_);
+
+ // Executes any timers that are due. Returns number of milliseconds
+ // to wait to match the next timer or 0 meaning "no timers".
+ uint64_t execute_timers ();
+
+ private:
+
+ // Clock instance private to this I/O thread.
+ clock_t clock;
+
+ // List of active timers.
+ struct timer_info_t
+ {
+ struct i_poll_events *sink;
+ int id;
+ };
+ typedef std::multimap <uint64_t, timer_info_t> timers_t;
+ timers_t timers;
+
+ // Load of the poller. Currently the number of file descriptors
+ // registered.
+ atomic_counter_t load;
+
+ poller_base_t (const poller_base_t&);
+ void operator = (const poller_base_t&);
+ };
+
+}
+
+#endif