1 /*
2 Copyright (c) 2007-2010 iMatix Corporation
3
4 This file is part of 0MQ.
5
6 0MQ is free software; you can redistribute it and/or modify it under
7 the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 0MQ is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20 #include "poller_base.hpp"
21 #include "i_poll_events.hpp"
22 #include "err.hpp"
23
poller_base_t()24 zmq::poller_base_t::poller_base_t ()
25 {
26 }
27
~poller_base_t()28 zmq::poller_base_t::~poller_base_t ()
29 {
30 // Make sure there is no more load on the shutdown.
31 zmq_assert (get_load () == 0);
32 }
33
get_load()34 int zmq::poller_base_t::get_load ()
35 {
36 return load.get ();
37 }
38
adjust_load(int amount_)39 void zmq::poller_base_t::adjust_load (int amount_)
40 {
41 if (amount_ > 0)
42 load.add (amount_);
43 else if (amount_ < 0)
44 load.sub (-amount_);
45 }
46
add_timer(int timeout_,i_poll_events * sink_,int id_)47 void zmq::poller_base_t::add_timer (int timeout_, i_poll_events *sink_, int id_)
48 {
49 uint64_t expiration = clock.now_ms () + timeout_;
50 timer_info_t info = {sink_, id_};
51 timers.insert (timers_t::value_type (expiration, info));
52 }
53
cancel_timer(i_poll_events * sink_,int id_)54 void zmq::poller_base_t::cancel_timer (i_poll_events *sink_, int id_)
55 {
56 // Complexity of this operation is O(n). We assume it is rarely used.
57 for (timers_t::iterator it = timers.begin (); it != timers.end (); ++it)
58 if (it->second.sink == sink_ && it->second.id == id_) {
59 timers.erase (it);
60 return;
61 }
62
63 // Timer not found.
64 zmq_assert (false);
65 }
66
execute_timers()67 uint64_t zmq::poller_base_t::execute_timers ()
68 {
69 // Fast track.
70 if (timers.empty ())
71 return 0;
72
73 // Get the current time.
74 uint64_t current = clock.now_ms ();
75
76 // Execute the timers that are already due.
77 timers_t::iterator it = timers.begin ();
78 while (it != timers.end ()) {
79
80 // If we have to wait to execute the item, same will be true about
81 // all the following items (multimap is sorted). Thus we can stop
82 // checking the subsequent timers and return the time to wait for
83 // the next timer (at least 1ms).
84 if (it->first > current)
85 return it->first - current;
86
87 // Trigger the timer.
88 it->second.sink->timer_event (it->second.id);
89
90 // Remove it from the list of active timers.
91 timers_t::iterator o = it;
92 ++it;
93 timers.erase (o);
94 }
95
96 // There are no more timers.
97 return 0;
98 }
99