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
32 #include <new>
33
34 #include "macros.hpp"
35 #include "io_thread.hpp"
36 #include "err.hpp"
37 #include "ctx.hpp"
38
io_thread_t(ctx_t * ctx_,uint32_t tid_)39 zmq::io_thread_t::io_thread_t (ctx_t *ctx_, uint32_t tid_) :
40 object_t (ctx_, tid_),
41 _mailbox_handle (static_cast<poller_t::handle_t> (NULL))
42 {
43 _poller = new (std::nothrow) poller_t (*ctx_);
44 alloc_assert (_poller);
45
46 if (_mailbox.get_fd () != retired_fd) {
47 _mailbox_handle = _poller->add_fd (_mailbox.get_fd (), this);
48 _poller->set_pollin (_mailbox_handle);
49 }
50 }
51
~io_thread_t()52 zmq::io_thread_t::~io_thread_t ()
53 {
54 LIBZMQ_DELETE (_poller);
55 }
56
start()57 void zmq::io_thread_t::start ()
58 {
59 char name[16] = "";
60 snprintf (name, sizeof (name), "IO/%u",
61 get_tid () - zmq::ctx_t::reaper_tid - 1);
62 // Start the underlying I/O thread.
63 _poller->start (name);
64 }
65
stop()66 void zmq::io_thread_t::stop ()
67 {
68 send_stop ();
69 }
70
get_mailbox()71 zmq::mailbox_t *zmq::io_thread_t::get_mailbox ()
72 {
73 return &_mailbox;
74 }
75
get_load() const76 int zmq::io_thread_t::get_load () const
77 {
78 return _poller->get_load ();
79 }
80
in_event()81 void zmq::io_thread_t::in_event ()
82 {
83 // TODO: Do we want to limit number of commands I/O thread can
84 // process in a single go?
85
86 command_t cmd;
87 int rc = _mailbox.recv (&cmd, 0);
88
89 while (rc == 0 || errno == EINTR) {
90 if (rc == 0)
91 cmd.destination->process_command (cmd);
92 rc = _mailbox.recv (&cmd, 0);
93 }
94
95 errno_assert (rc != 0 && errno == EAGAIN);
96 }
97
out_event()98 void zmq::io_thread_t::out_event ()
99 {
100 // We are never polling for POLLOUT here. This function is never called.
101 zmq_assert (false);
102 }
103
timer_event(int)104 void zmq::io_thread_t::timer_event (int)
105 {
106 // No timers here. This function is never called.
107 zmq_assert (false);
108 }
109
get_poller() const110 zmq::poller_t *zmq::io_thread_t::get_poller () const
111 {
112 zmq_assert (_poller);
113 return _poller;
114 }
115
process_stop()116 void zmq::io_thread_t::process_stop ()
117 {
118 zmq_assert (_mailbox_handle);
119 _poller->rm_fd (_mailbox_handle);
120 _poller->stop ();
121 }
122