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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/>.
+*/
+
+#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->second.id == id_) {
+ timers.erase (it);
+ return;
+ }
+
+ // 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->second.id);
+
+ // Remove it from the list of active timers.
+ timers_t::iterator o = it;
+ ++it;
+ timers.erase (o);
+ }
+
+ // There are no more timers.
+ return 0;
+}