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 "pair.hpp"
33#include "err.hpp"
34#include "pipe.hpp"
35#include "msg.hpp"
36
37zmq::pair_t::pair_t (class ctx_t *parent_, uint32_t tid_, int sid_) :
38 socket_base_t (parent_, tid_, sid_),
39 _pipe (NULL),
40 _last_in (NULL)
41{
42 options.type = ZMQ_PAIR;
43}
44
45zmq::pair_t::~pair_t ()
46{
47 zmq_assert (!_pipe);
48}
49
50void zmq::pair_t::xattach_pipe (pipe_t *pipe_,
51 bool subscribe_to_all_,
52 bool locally_initiated_)
53{
54 LIBZMQ_UNUSED (subscribe_to_all_);
55 LIBZMQ_UNUSED (locally_initiated_);
56
57 zmq_assert (pipe_ != NULL);
58
59 // ZMQ_PAIR socket can only be connected to a single peer.
60 // The socket rejects any further connection requests.
61 if (_pipe == NULL)
62 _pipe = pipe_;
63 else
64 pipe_->terminate (false);
65}
66
67void zmq::pair_t::xpipe_terminated (pipe_t *pipe_)
68{
69 if (pipe_ == _pipe) {
70 if (_last_in == _pipe) {
71 _last_in = NULL;
72 }
73 _pipe = NULL;
74 }
75}
76
77void zmq::pair_t::xread_activated (pipe_t *)
78{
79 // There's just one pipe. No lists of active and inactive pipes.
80 // There's nothing to do here.
81}
82
83void zmq::pair_t::xwrite_activated (pipe_t *)
84{
85 // There's just one pipe. No lists of active and inactive pipes.
86 // There's nothing to do here.
87}
88
89int zmq::pair_t::xsend (msg_t *msg_)
90{
91 if (!_pipe || !_pipe->write (msg_)) {
92 errno = EAGAIN;
93 return -1;
94 }
95
96 if (!(msg_->flags () & msg_t::more))
97 _pipe->flush ();
98
99 // Detach the original message from the data buffer.
100 int rc = msg_->init ();
101 errno_assert (rc == 0);
102
103 return 0;
104}
105
106int zmq::pair_t::xrecv (msg_t *msg_)
107{
108 // Deallocate old content of the message.
109 int rc = msg_->close ();
110 errno_assert (rc == 0);
111
112 if (!_pipe || !_pipe->read (msg_)) {
113 // Initialise the output parameter to be a 0-byte message.
114 rc = msg_->init ();
115 errno_assert (rc == 0);
116
117 errno = EAGAIN;
118 return -1;
119 }
120 _last_in = _pipe;
121 return 0;
122}
123
124bool zmq::pair_t::xhas_in ()
125{
126 if (!_pipe)
127 return false;
128
129 return _pipe->check_read ();
130}
131
132bool zmq::pair_t::xhas_out ()
133{
134 if (!_pipe)
135 return false;
136
137 return _pipe->check_write ();
138}
139