1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
|
/*
Copyright (c) 2007-2011 iMatix Corporation
Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
This file is part of 0MQ.
0MQ is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
0MQ is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "../include/zmq.h"
#include "dist.hpp"
#include "pipe.hpp"
#include "err.hpp"
#include "own.hpp"
#include "msg_content.hpp"
#include "likely.hpp"
zmq::dist_t::dist_t (own_t *sink_) :
active (0),
eligible (0),
more (false),
sink (sink_),
terminating (false)
{
}
zmq::dist_t::~dist_t ()
{
zmq_assert (pipes.empty ());
}
void zmq::dist_t::attach (writer_t *pipe_)
{
pipe_->set_event_sink (this);
// If we are in the middle of sending a message, we'll add new pipe
// into the list of eligible pipes. Otherwise we add it to the list
// of active pipes.
if (more) {
pipes.push_back (pipe_);
pipes.swap (eligible, pipes.size () - 1);
eligible++;
}
else {
pipes.push_back (pipe_);
pipes.swap (active, pipes.size () - 1);
active++;
eligible++;
}
if (unlikely (terminating)) {
sink->register_term_acks (1);
pipe_->terminate ();
}
}
void zmq::dist_t::terminate ()
{
zmq_assert (!terminating);
terminating = true;
sink->register_term_acks (pipes.size ());
for (pipes_t::size_type i = 0; i != pipes.size (); i++)
pipes [i]->terminate ();
}
void zmq::dist_t::terminated (writer_t *pipe_)
{
// Remove the pipe from the list; adjust number of active and/or
// eligible pipes accordingly.
if (pipes.index (pipe_) < active)
active--;
if (pipes.index (pipe_) < eligible)
eligible--;
pipes.erase (pipe_);
if (unlikely (terminating))
sink->unregister_term_ack ();
}
void zmq::dist_t::activated (writer_t *pipe_)
{
// Move the pipe from passive to eligible state.
pipes.swap (pipes.index (pipe_), eligible);
eligible++;
// If there's no message being sent at the moment, move it to
// the active state.
if (!more) {
pipes.swap (eligible - 1, active);
active++;
}
}
int zmq::dist_t::send (zmq_msg_t *msg_, int flags_)
{
// Is this end of a multipart message?
bool msg_more = msg_->flags & ZMQ_MSG_MORE;
// Push the message to active pipes.
distribute (msg_, flags_);
// If multipart message is fully sent, activate all the eligible pipes.
if (!msg_more)
active = eligible;
more = msg_more;
return 0;
}
void zmq::dist_t::distribute (zmq_msg_t *msg_, int flags_)
{
// If there are no active pipes available, simply drop the message.
if (active == 0) {
int rc = zmq_msg_close (msg_);
zmq_assert (rc == 0);
rc = zmq_msg_init (msg_);
zmq_assert (rc == 0);
return;
}
msg_content_t *content = (msg_content_t*) msg_->content;
// For VSMs the copying is straighforward.
if (content == (msg_content_t*) ZMQ_VSM) {
for (pipes_t::size_type i = 0; i < active;)
if (write (pipes [i], msg_))
i++;
int rc = zmq_msg_init (msg_);
zmq_assert (rc == 0);
return;
}
// Optimisation for the case when there's only a single pipe
// to send the message to - no refcount adjustment i.e. no atomic
// operations are needed.
if (active == 1) {
if (!write (pipes [0], msg_)) {
int rc = zmq_msg_close (msg_);
zmq_assert (rc == 0);
}
int rc = zmq_msg_init (msg_);
zmq_assert (rc == 0);
return;
}
// There are at least 2 destinations for the message. That means we have
// to deal with reference counting. First add N-1 references to
// the content (we are holding one reference anyway, that's why -1).
if (msg_->flags & ZMQ_MSG_SHARED)
content->refcnt.add (active - 1);
else {
content->refcnt.set (active);
msg_->flags |= ZMQ_MSG_SHARED;
}
// Push the message to all destinations.
for (pipes_t::size_type i = 0; i < active;) {
if (!write (pipes [i], msg_))
content->refcnt.sub (1);
else
i++;
}
// Detach the original message from the data buffer.
int rc = zmq_msg_init (msg_);
zmq_assert (rc == 0);
}
bool zmq::dist_t::has_out ()
{
return true;
}
bool zmq::dist_t::write (class writer_t *pipe_, zmq_msg_t *msg_)
{
if (!pipe_->write (msg_)) {
pipes.swap (pipes.index (pipe_), active - 1);
active--;
pipes.swap (active, eligible - 1);
eligible--;
return false;
}
if (!(msg_->flags & ZMQ_MSG_MORE))
pipe_->flush ();
return true;
}
|
