1/*
2 Copyright (c) 2007-2016 Contributors as noted in the AUTHORS file
3
4 This file is part of libzmq, the ZeroMQ core engine in C++.
5
6 libzmq is free software; you can redistribute it and/or modify it under
7 the terms of the GNU Lesser General Public License (LGPL) as published
8 by the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 As a special exception, the Contributors give you permission to link
12 this library with independent modules to produce an executable,
13 regardless of the license terms of these independent modules, and to
14 copy and distribute the resulting executable under terms of your choice,
15 provided that you also meet, for each linked independent module, the
16 terms and conditions of the license of that module. An independent
17 module is a module which is not derived from or based on this library.
18 If you modify this library, you must extend this exception to your
19 version of the library.
20
21 libzmq is distributed in the hope that it will be useful, but WITHOUT
22 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
23 FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
24 License for more details.
25
26 You should have received a copy of the GNU Lesser General Public License
27 along with this program. If not, see <http://www.gnu.org/licenses/>.
28*/
29
30#include "precompiled.hpp"
31#include "poller_base.hpp"
32#include "i_poll_events.hpp"
33#include "err.hpp"
34
35zmq::poller_base_t::poller_base_t ()
36{
37}
38
39zmq::poller_base_t::~poller_base_t ()
40{
41 // Make sure there is no more load on the shutdown.
42 zmq_assert (get_load () == 0);
43}
44
45int zmq::poller_base_t::get_load () const
46{
47 return _load.get ();
48}
49
50void zmq::poller_base_t::adjust_load (int amount_)
51{
52 if (amount_ > 0)
53 _load.add (amount_);
54 else if (amount_ < 0)
55 _load.sub (-amount_);
56}
57
58void zmq::poller_base_t::add_timer (int timeout_, i_poll_events *sink_, int id_)
59{
60 uint64_t expiration = _clock.now_ms () + timeout_;
61 timer_info_t info = {sink_, id_};
62 _timers.insert (timers_t::value_type (expiration, info));
63}
64
65void zmq::poller_base_t::cancel_timer (i_poll_events *sink_, int id_)
66{
67 // Complexity of this operation is O(n). We assume it is rarely used.
68 for (timers_t::iterator it = _timers.begin (), end = _timers.end ();
69 it != end; ++it)
70 if (it->second.sink == sink_ && it->second.id == id_) {
71 _timers.erase (it);
72 return;
73 }
74
75 // Timer not found.
76 zmq_assert (false);
77}
78
79uint64_t zmq::poller_base_t::execute_timers ()
80{
81 // Fast track.
82 if (_timers.empty ())
83 return 0;
84
85 // Get the current time.
86 const uint64_t current = _clock.now_ms ();
87
88 // Execute the timers that are already due.
89 const timers_t::iterator begin = _timers.begin ();
90 const timers_t::iterator end = _timers.end ();
91 uint64_t res = 0;
92 timers_t::iterator it = begin;
93 for (; it != end; ++it) {
94 // If we have to wait to execute the item, same will be true about
95 // all the following items (multimap is sorted). Thus we can stop
96 // checking the subsequent timers.
97 if (it->first > current) {
98 res = it->first - current;
99 break;
100 }
101
102 // Trigger the timer.
103 it->second.sink->timer_event (it->second.id);
104 }
105
106 // Remove them from the list of active timers.
107 _timers.erase (begin, it);
108
109 // Return the time to wait for the next timer (at least 1ms), or 0, if
110 // there are no more timers.
111 return res;
112}
113
114zmq::worker_poller_base_t::worker_poller_base_t (const thread_ctx_t &ctx_) :
115 _ctx (ctx_)
116{
117}
118
119void zmq::worker_poller_base_t::stop_worker ()
120{
121 _worker.stop ();
122}
123
124void zmq::worker_poller_base_t::start (const char *name_)
125{
126 zmq_assert (get_load () > 0);
127 _ctx.start_thread (_worker, worker_routine, this, name_);
128}
129
130void zmq::worker_poller_base_t::check_thread ()
131{
132#ifdef _DEBUG
133 zmq_assert (!_worker.get_started () || _worker.is_current_thread ());
134#endif
135}
136
137void zmq::worker_poller_base_t::worker_routine (void *arg_)
138{
139 (static_cast<worker_poller_base_t *> (arg_))->loop ();
140}
141