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Copyright (c) 2010-2011 250bpm s.r.o.
Copyright (c) 2010-2011 Other contributors as noted in the AUTHORS file
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
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 <>.
#include "poller_base.hpp"
#include "i_poll_events.hpp"
#include "err.hpp"
zmq::poller_base_t::poller_base_t ()
zmq::poller_base_t::~poller_base_t ()
// Make sure there is no more load on the shutdown.
zmq_assert (get_load () == 0);
int zmq::poller_base_t::get_load ()
return load.get ();
void zmq::poller_base_t::adjust_load (int amount_)
if (amount_ > 0)
load.add (amount_);
else if (amount_ < 0)
load.sub (-amount_);
void zmq::poller_base_t::add_timer (int timeout_, i_poll_events *sink_, int id_)
uint64_t expiration = clock.now_ms () + timeout_;
timer_info_t info = {sink_, id_};
timers.insert (timers_t::value_type (expiration, info));
void zmq::poller_base_t::cancel_timer (i_poll_events *sink_, int id_)
// Complexity of this operation is O(n). We assume it is rarely used.
for (timers_t::iterator it = timers.begin (); it != timers.end (); ++it)
if (it->second.sink == sink_ && it-> == id_) {
timers.erase (it);
// Timer not found.
zmq_assert (false);
uint64_t zmq::poller_base_t::execute_timers ()
// Fast track.
if (timers.empty ())
return 0;
// Get the current time.
uint64_t current = clock.now_ms ();
// Execute the timers that are already due.
timers_t::iterator it = timers.begin ();
while (it != timers.end ()) {
// If we have to wait to execute the item, same will be true about
// all the following items (multimap is sorted). Thus we can stop
// checking the subsequent timers and return the time to wait for
// the next timer (at least 1ms).
if (it->first > current)
return it->first - current;
// Trigger the timer.
it->second.sink->timer_event (it->;
// Remove it from the list of active timers.
timers_t::iterator o = it;
timers.erase (o);
// There are no more timers.
return 0;
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