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
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
/*
Copyright (c) 2009-2011 250bpm s.r.o.
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 "own.hpp"
#include "err.hpp"
#include "io_thread.hpp"
zmq::own_t::own_t (class ctx_t *parent_, uint32_t tid_) :
object_t (parent_, tid_),
terminating (false),
sent_seqnum (0),
processed_seqnum (0),
owner (NULL),
term_acks (0)
{
}
zmq::own_t::own_t (io_thread_t *io_thread_, const options_t &options_) :
object_t (io_thread_),
options (options_),
terminating (false),
sent_seqnum (0),
processed_seqnum (0),
owner (NULL),
term_acks (0)
{
}
zmq::own_t::~own_t ()
{
}
void zmq::own_t::set_owner (own_t *owner_)
{
zmq_assert (!owner);
owner = owner_;
}
void zmq::own_t::inc_seqnum ()
{
// This function may be called from a different thread!
sent_seqnum.add (1);
}
void zmq::own_t::process_seqnum ()
{
// Catch up with counter of processed commands.
processed_seqnum++;
// We may have catched up and still have pending terms acks.
check_term_acks ();
}
void zmq::own_t::launch_child (own_t *object_)
{
// Specify the owner of the object.
object_->set_owner (this);
// Plug the object into the I/O thread.
send_plug (object_);
// Take ownership of the object.
send_own (this, object_);
}
void zmq::own_t::launch_sibling (own_t *object_)
{
// At this point it is important that object is plugged in before its
// owner has a chance to terminate it. Thus, 'plug' command is sent before
// the 'own' command. Given that the mailbox preserves ordering of
// commands, 'term' command from the owner cannot make it to the object
// before the already written 'plug' command.
// Specify the owner of the object.
object_->set_owner (owner);
// Plug the object into its I/O thread.
send_plug (object_);
// Make parent own the object.
send_own (owner, object_);
}
void zmq::own_t::process_term_req (own_t *object_)
{
// When shutting down we can ignore termination requests from owned
// objects. The termination request was already sent to the object.
if (terminating)
return;
// If I/O object is well and alive let's ask it to terminate.
owned_t::iterator it = std::find (owned.begin (), owned.end (), object_);
// If not found, we assume that termination request was already sent to
// the object so we can safely ignore the request.
if (it == owned.end ())
return;
owned.erase (it);
register_term_acks (1);
// Note that this object is the root of the (partial shutdown) thus, its
// value of linger is used, rather than the value stored by the children.
send_term (object_, options.linger);
}
void zmq::own_t::process_own (own_t *object_)
{
// If the object is already being shut down, new owned objects are
// immediately asked to terminate. Note that linger is set to zero.
if (terminating) {
register_term_acks (1);
send_term (object_, 0);
return;
}
// Store the reference to the owned object.
owned.insert (object_);
}
void zmq::own_t::terminate ()
{
// If termination is already underway, there's no point
// in starting it anew.
if (terminating)
return;
// As for the root of the ownership tree, there's noone to terminate it,
// so it has to terminate itself.
if (!owner) {
process_term (options.linger);
return;
}
// If I am an owned object, I'll ask my owner to terminate me.
send_term_req (owner, this);
}
bool zmq::own_t::is_terminating ()
{
return terminating;
}
void zmq::own_t::process_term (int linger_)
{
// Double termination should never happen.
zmq_assert (!terminating);
// Send termination request to all owned objects.
for (owned_t::iterator it = owned.begin (); it != owned.end (); ++it)
send_term (*it, linger_);
register_term_acks ((int) owned.size ());
owned.clear ();
// Start termination process and check whether by chance we cannot
// terminate immediately.
terminating = true;
check_term_acks ();
}
void zmq::own_t::register_term_acks (int count_)
{
term_acks += count_;
}
void zmq::own_t::unregister_term_ack ()
{
zmq_assert (term_acks > 0);
term_acks--;
// This may be a last ack we are waiting for before termination...
check_term_acks ();
}
void zmq::own_t::process_term_ack ()
{
unregister_term_ack ();
}
void zmq::own_t::check_term_acks ()
{
if (terminating && processed_seqnum == sent_seqnum.get () &&
term_acks == 0) {
// Sanity check. There should be no active children at this point.
zmq_assert (owned.empty ());
// The root object has nobody to confirm the termination to.
// Other nodes will confirm the termination to the owner.
if (owner)
send_term_ack (owner);
// Deallocate the resources.
process_destroy ();
}
}
void zmq::own_t::process_destroy ()
{
delete this;
}
|
