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 "macros.hpp"
32#include "reaper.hpp"
33#include "socket_base.hpp"
34#include "err.hpp"
35
36zmq::reaper_t::reaper_t (class ctx_t *ctx_, uint32_t tid_) :
37 object_t (ctx_, tid_),
38 _mailbox_handle (static_cast<poller_t::handle_t> (NULL)),
39 _poller (NULL),
40 _sockets (0),
41 _terminating (false)
42{
43 if (!_mailbox.valid ())
44 return;
45
46 _poller = new (std::nothrow) poller_t (*ctx_);
47 alloc_assert (_poller);
48
49 if (_mailbox.get_fd () != retired_fd) {
50 _mailbox_handle = _poller->add_fd (_mailbox.get_fd (), this);
51 _poller->set_pollin (_mailbox_handle);
52 }
53
54#ifdef HAVE_FORK
55 _pid = getpid ();
56#endif
57}
58
59zmq::reaper_t::~reaper_t ()
60{
61 LIBZMQ_DELETE (_poller);
62}
63
64zmq::mailbox_t *zmq::reaper_t::get_mailbox ()
65{
66 return &_mailbox;
67}
68
69void zmq::reaper_t::start ()
70{
71 zmq_assert (_mailbox.valid ());
72
73 // Start the thread.
74 _poller->start ("Reaper");
75}
76
77void zmq::reaper_t::stop ()
78{
79 if (get_mailbox ()->valid ()) {
80 send_stop ();
81 }
82}
83
84void zmq::reaper_t::in_event ()
85{
86 while (true) {
87#ifdef HAVE_FORK
88 if (unlikely (_pid != getpid ())) {
89 //printf("zmq::reaper_t::in_event return in child process %d\n", (int)getpid());
90 return;
91 }
92#endif
93
94 // Get the next command. If there is none, exit.
95 command_t cmd;
96 int rc = _mailbox.recv (&cmd, 0);
97 if (rc != 0 && errno == EINTR)
98 continue;
99 if (rc != 0 && errno == EAGAIN)
100 break;
101 errno_assert (rc == 0);
102
103 // Process the command.
104 cmd.destination->process_command (cmd);
105 }
106}
107
108void zmq::reaper_t::out_event ()
109{
110 zmq_assert (false);
111}
112
113void zmq::reaper_t::timer_event (int)
114{
115 zmq_assert (false);
116}
117
118void zmq::reaper_t::process_stop ()
119{
120 _terminating = true;
121
122 // If there are no sockets being reaped finish immediately.
123 if (!_sockets) {
124 send_done ();
125 _poller->rm_fd (_mailbox_handle);
126 _poller->stop ();
127 }
128}
129
130void zmq::reaper_t::process_reap (socket_base_t *socket_)
131{
132 // Add the socket to the poller.
133 socket_->start_reaping (_poller);
134
135 ++_sockets;
136}
137
138void zmq::reaper_t::process_reaped ()
139{
140 --_sockets;
141
142 // If reaped was already asked to terminate and there are no more sockets,
143 // finish immediately.
144 if (!_sockets && _terminating) {
145 send_done ();
146 _poller->rm_fd (_mailbox_handle);
147 _poller->stop ();
148 }
149}
150