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96 lines
3.1 KiB
C++
96 lines
3.1 KiB
C++
/*
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Copyright (c) 2007-2016 Contributors as noted in the AUTHORS file
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This file is part of libzmq, the ZeroMQ core engine in C++.
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libzmq is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License (LGPL) as published
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by the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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As a special exception, the Contributors give you permission to link
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this library with independent modules to produce an executable,
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regardless of the license terms of these independent modules, and to
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copy and distribute the resulting executable under terms of your choice,
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provided that you also meet, for each linked independent module, the
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terms and conditions of the license of that module. An independent
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module is a module which is not derived from or based on this library.
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If you modify this library, you must extend this exception to your
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version of the library.
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libzmq is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ZMQ_POLLER_BASE_HPP_INCLUDED__
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#define __ZMQ_POLLER_BASE_HPP_INCLUDED__
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#include <map>
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#include "clock.hpp"
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#include "atomic_counter.hpp"
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namespace zmq
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{
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struct i_poll_events;
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class poller_base_t
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{
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public:
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poller_base_t ();
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virtual ~poller_base_t ();
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// Returns load of the poller. Note that this function can be
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// invoked from a different thread!
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int get_load ();
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// Add a timeout to expire in timeout_ milliseconds. After the
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// expiration timer_event on sink_ object will be called with
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// argument set to id_.
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void add_timer (int timeout_, zmq::i_poll_events *sink_, int id_);
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// Cancel the timer created by sink_ object with ID equal to id_.
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void cancel_timer (zmq::i_poll_events *sink_, int id_);
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protected:
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// Called by individual poller implementations to manage the load.
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void adjust_load (int amount_);
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// Executes any timers that are due. Returns number of milliseconds
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// to wait to match the next timer or 0 meaning "no timers".
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uint64_t execute_timers ();
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private:
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// Clock instance private to this I/O thread.
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clock_t clock;
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// List of active timers.
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struct timer_info_t
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{
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zmq::i_poll_events *sink;
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int id;
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};
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typedef std::multimap <uint64_t, timer_info_t> timers_t;
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timers_t timers;
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// Load of the poller. Currently the number of file descriptors
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// registered.
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atomic_counter_t load;
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poller_base_t (const poller_base_t&);
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const poller_base_t &operator = (const poller_base_t&);
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};
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}
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#endif
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