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
|
/*
Copyright (c) 2007-2009 FastMQ Inc.
This file is part of 0MQ.
0MQ is free software; you can redistribute it and/or modify it under
the terms of the Lesser GNU 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
Lesser GNU General Public License for more details.
You should have received a copy of the Lesser GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "../include/zmq.h"
#include "dispatcher.hpp"
#include "app_thread.hpp"
#include "io_thread.hpp"
#include "platform.hpp"
#include "err.hpp"
#include "pipe.hpp"
#if defined ZMQ_HAVE_WINDOWS
#include "windows.h"
#endif
zmq::dispatcher_t::dispatcher_t (int app_threads_, int io_threads_)
{
#ifdef ZMQ_HAVE_WINDOWS
// Intialise Windows sockets. Note that WSAStartup can be called multiple
// times given that WSACleanup will be called for each WSAStartup.
WORD version_requested = MAKEWORD (2, 2);
WSADATA wsa_data;
int rc = WSAStartup (version_requested, &wsa_data);
zmq_assert (rc == 0);
zmq_assert (LOBYTE (wsa_data.wVersion) == 2 &&
HIBYTE (wsa_data.wVersion) == 2);
#endif
// Create application thread proxies.
for (int i = 0; i != app_threads_; i++) {
app_thread_t *app_thread = new app_thread_t (this, i);
zmq_assert (app_thread);
app_threads.push_back (app_thread);
signalers.push_back (app_thread->get_signaler ());
}
// Create I/O thread objects.
for (int i = 0; i != io_threads_; i++) {
io_thread_t *io_thread = new io_thread_t (this, i + app_threads_);
zmq_assert (io_thread);
io_threads.push_back (io_thread);
signalers.push_back (io_thread->get_signaler ());
}
// Create command pipe matrix.
command_pipes = new command_pipe_t [signalers.size () * signalers.size ()];
zmq_assert (command_pipes);
// Launch I/O threads.
for (int i = 0; i != io_threads_; i++)
io_threads [i]->start ();
}
zmq::dispatcher_t::~dispatcher_t ()
{
// Close all application theads, sockets, io_objects etc.
for (app_threads_t::size_type i = 0; i != app_threads.size (); i++)
delete app_threads [i];
// Ask I/O threads to terminate. If stop signal wasn't sent to I/O
// thread subsequent invocation of destructor would hang-up.
for (io_threads_t::size_type i = 0; i != io_threads.size (); i++)
io_threads [i]->stop ();
// Wait till I/O threads actually terminate.
for (io_threads_t::size_type i = 0; i != io_threads.size (); i++)
delete io_threads [i];
// Deallocate all the orphaned pipes.
for (pipes_t::iterator it = pipes.begin (); it != pipes.end (); it++)
delete *it;
delete [] command_pipes;
#ifdef ZMQ_HAVE_WINDOWS
// On Windows, uninitialise socket layer.
int rc = WSACleanup ();
wsa_assert (rc != SOCKET_ERROR);
#endif
}
int zmq::dispatcher_t::thread_slot_count ()
{
return signalers.size ();
}
zmq::socket_base_t *zmq::dispatcher_t::create_socket (int type_)
{
threads_sync.lock ();
app_thread_t *thread = choose_app_thread ();
if (!thread) {
threads_sync.unlock ();
return NULL;
}
threads_sync.unlock ();
return thread->create_socket (type_);
}
zmq::app_thread_t *zmq::dispatcher_t::choose_app_thread ()
{
// Check whether thread ID is already assigned. If so, return it.
for (app_threads_t::size_type i = 0; i != app_threads.size (); i++)
if (app_threads [i]->is_current ())
return app_threads [i];
// Check whether there's an unused thread slot in the cotext.
for (app_threads_t::size_type i = 0; i != app_threads.size (); i++)
if (app_threads [i]->make_current ())
return app_threads [i];
// Thread limit was exceeded.
errno = EMFILE;
return NULL;
}
zmq::io_thread_t *zmq::dispatcher_t::choose_io_thread (uint64_t taskset_)
{
zmq_assert (io_threads.size () > 0);
// Find the I/O thread with minimum load.
int min_load = io_threads [0]->get_load ();
io_threads_t::size_type result = 0;
for (io_threads_t::size_type i = 1; i != io_threads.size (); i++) {
if (!taskset_ || (taskset_ & (uint64_t (1) << i))) {
int load = io_threads [i]->get_load ();
if (load < min_load) {
min_load = load;
result = i;
}
}
}
return io_threads [result];
}
void zmq::dispatcher_t::register_pipe (class pipe_t *pipe_)
{
pipes_sync.lock ();
bool inserted = pipes.insert (pipe_).second;
zmq_assert (inserted);
pipes_sync.unlock ();
}
void zmq::dispatcher_t::unregister_pipe (class pipe_t *pipe_)
{
pipes_sync.lock ();
pipes_t::size_type erased = pipes.erase (pipe_);
zmq_assert (erased == 1);
pipes_sync.unlock ();
}
|
