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
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
|
/*
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 "platform.hpp"
#include <string.h>
#include <algorithm>
#ifdef ZMQ_HAVE_WINDOWS
#include "winsock2.h"
#elif defined ZMQ_HAVE_HPUX
#include <sys/param.h>
#include <sys/types.h>
#include <sys/time.h>
#elif defined ZMQ_HAVE_OPENVMS
#include <sys/types.h>
#include <sys/time.h>
#else
#include <sys/select.h>
#endif
#include "select.hpp"
#include "err.hpp"
#include "config.hpp"
#include "i_poll_events.hpp"
zmq::select_t::select_t () :
maxfd (retired_fd),
retired (false),
stopping (false)
{
// Clear file descriptor sets.
FD_ZERO (&source_set_in);
FD_ZERO (&source_set_out);
FD_ZERO (&source_set_err);
}
zmq::handle_t zmq::select_t::add_fd (fd_t fd_, i_poll_events *events_)
{
// Store the file descriptor.
fd_entry_t entry = {fd_, events_};
fds.push_back (entry);
// Start polling on errors.
FD_SET (fd_, &source_set_err);
// Adjust maxfd if necessary.
if (fd_ > maxfd)
maxfd = fd_;
// Increase the load metric of the thread.
load.add (1);
handle_t handle;
handle.fd = fd_;
return handle;
}
void zmq::select_t::rm_fd (handle_t handle_)
{
// Get file descriptor.
fd_t fd = handle_.fd;
// Mark the descriptor as retired.
fd_set_t::iterator it;
for (it = fds.begin (); it != fds.end (); it ++)
if (it->fd == fd)
break;
zmq_assert (it != fds.end ());
it->fd = retired_fd;
retired = true;
// Stop polling on the descriptor.
FD_CLR (fd, &source_set_in);
FD_CLR (fd, &source_set_out);
FD_CLR (fd, &source_set_err);
// Discard all events generated on this file descriptor.
FD_CLR (fd, &readfds);
FD_CLR (fd, &writefds);
FD_CLR (fd, &exceptfds);
// Adjust the maxfd attribute if we have removed the
// highest-numbered file descriptor.
if (fd == maxfd) {
maxfd = retired_fd;
for (fd_set_t::iterator it = fds.begin (); it != fds.end (); it ++)
if (it->fd > maxfd)
maxfd = it->fd;
}
// Decrease the load metric of the thread.
load.sub (1);
}
void zmq::select_t::set_pollin (handle_t handle_)
{
FD_SET (handle_.fd, &source_set_in);
}
void zmq::select_t::reset_pollin (handle_t handle_)
{
FD_CLR (handle_.fd, &source_set_in);
}
void zmq::select_t::set_pollout (handle_t handle_)
{
FD_SET (handle_.fd, &source_set_out);
}
void zmq::select_t::reset_pollout (handle_t handle_)
{
FD_CLR (handle_.fd, &source_set_out);
}
void zmq::select_t::add_timer (i_poll_events *events_)
{
timers.push_back (events_);
}
void zmq::select_t::cancel_timer (i_poll_events *events_)
{
timers_t::iterator it = std::find (timers.begin (), timers.end (), events_);
if (it != timers.end ())
timers.erase (it);
}
int zmq::select_t::get_load ()
{
return load.get ();
}
void zmq::select_t::start ()
{
worker.start (worker_routine, this);
}
void zmq::select_t::stop ()
{
stopping = true;
}
void zmq::select_t::join ()
{
worker.stop ();
}
void zmq::select_t::loop ()
{
while (!stopping) {
// Intialise the pollsets.
memcpy (&readfds, &source_set_in, sizeof source_set_in);
memcpy (&writefds, &source_set_out, sizeof source_set_out);
memcpy (&exceptfds, &source_set_err, sizeof source_set_err);
// Compute the timout interval. Select is free to overwrite the
// value so we have to compute it each time anew.
timeval timeout = {max_timer_period / 1000,
(max_timer_period % 1000) * 1000};
// Wait for events.
int rc = select (maxfd + 1, &readfds, &writefds, &exceptfds,
timers.empty () ? NULL : &timeout);
#ifdef ZMQ_HAVE_WINDOWS
wsa_assert (rc != SOCKET_ERROR);
#else
if (rc == -1 && errno == EINTR)
continue;
errno_assert (rc != -1);
#endif
// Handle timer.
if (!rc) {
// Use local list of timers as timer handlers may fill new timers
// into the original array.
timers_t t;
std::swap (timers, t);
// Trigger all the timers.
for (timers_t::iterator it = t.begin (); it != t.end (); it ++)
(*it)->timer_event ();
continue;
}
for (fd_set_t::size_type i = 0; i < fds.size (); i ++) {
if (fds [i].fd == retired_fd)
continue;
if (FD_ISSET (fds [i].fd, &exceptfds))
fds [i].events->in_event ();
if (fds [i].fd == retired_fd)
continue;
if (FD_ISSET (fds [i].fd, &writefds))
fds [i].events->out_event ();
if (fds [i].fd == retired_fd)
continue;
if (FD_ISSET (fds [i].fd, &readfds))
fds [i].events->in_event ();
}
// Destroy retired event sources.
if (retired) {
for (fd_set_t::size_type i = 0; i < fds.size (); i ++) {
if (fds [i].fd == retired_fd) {
fds.erase (fds.begin () + i);
i --;
}
}
retired = false;
}
}
}
void zmq::select_t::worker_routine (void *arg_)
{
((select_t*) arg_)->loop ();
}
|
