/[svn]/ircd-hybrid/trunk/src/s_bsd_poll.c
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Contents of /ircd-hybrid/trunk/src/s_bsd_poll.c

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Revision 6542 - (show annotations)
Wed Sep 16 11:01:51 2015 UTC (7 years, 2 months ago) by michael
File MIME type: text/x-chdr
File size: 4672 byte(s)
- Replace obsolete usleep() with nanosleep()

1 /*
2 * ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3 *
4 * Copyright (c) 2000-2015 ircd-hybrid development team
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
19 * USA
20 */
21
22 /*! \file s_bsd_poll.c
23 * \brief POSIX poll() compatible network routines.
24 * \version $Id$
25 */
26
27 #include "stdinc.h"
28 #if USE_IOPOLL_MECHANISM == __IOPOLL_MECHANISM_POLL
29 #include <sys/poll.h>
30 #include "fdlist.h"
31 #include "list.h"
32 #include "memory.h"
33 #include "ircd.h"
34 #include "s_bsd.h"
35 #include "log.h"
36
37 /* I hate linux -- adrian */
38 #ifndef POLLRDNORM
39 #define POLLRDNORM POLLIN
40 #endif
41 #ifndef POLLWRNORM
42 #define POLLWRNORM POLLOUT
43 #endif
44
45 static int pollfds_size;
46 static struct pollfd *pollfds;
47 static int pollnum;
48
49
50 /*
51 * init_netio
52 *
53 * This is a needed exported function which will be called to initialise
54 * the network loop code.
55 */
56 void
57 init_netio(void)
58 {
59 pollfds_size = hard_fdlimit;
60 pollfds = MyCalloc(sizeof(struct pollfd) * pollfds_size);
61 }
62
63 /*
64 * comm_setselect
65 *
66 * This is a needed exported function which will be called to register
67 * and deregister interest in a pending IO state for a given FD.
68 */
69 void
70 comm_setselect(fde_t *F, unsigned int type, void (*handler)(fde_t *, void *),
71 void *client_data, time_t timeout)
72 {
73 int new_events;
74
75 if ((type & COMM_SELECT_READ))
76 {
77 F->read_handler = handler;
78 F->read_data = client_data;
79 }
80
81 if ((type & COMM_SELECT_WRITE))
82 {
83 F->write_handler = handler;
84 F->write_data = client_data;
85 }
86
87 new_events = (F->read_handler ? POLLRDNORM : 0) |
88 (F->write_handler ? POLLWRNORM : 0);
89
90 if (timeout != 0)
91 {
92 F->timeout = CurrentTime + (timeout / 1000);
93 F->timeout_handler = handler;
94 F->timeout_data = client_data;
95 }
96
97 if (new_events != F->evcache)
98 {
99 if (new_events == 0)
100 {
101 if (F->comm_index != pollnum - 1)
102 {
103 fde_t *other = lookup_fd(pollfds[pollnum - 1].fd);
104
105 pollfds[F->comm_index].fd = pollfds[pollnum - 1].fd;
106 pollfds[F->comm_index].events = pollfds[pollnum - 1].events;
107 pollfds[F->comm_index].revents = pollfds[pollnum - 1].revents;
108
109 assert(other);
110 other->comm_index = F->comm_index;
111 }
112
113 F->comm_index = -1;
114 --pollnum;
115 }
116 else
117 {
118 if (F->evcache == 0)
119 {
120 if (pollnum >= pollfds_size)
121 {
122 pollfds_size *= 2;
123 pollfds = MyRealloc(pollfds, sizeof(struct pollfd) * pollfds_size);
124 }
125
126 F->comm_index = pollnum++;
127 pollfds[F->comm_index].fd = F->fd;
128 }
129
130 pollfds[F->comm_index].events = new_events;
131 pollfds[F->comm_index].revents = 0;
132 }
133
134 F->evcache = new_events;
135 }
136 }
137
138 /*
139 * comm_select
140 *
141 * Called to do the new-style IO, courtesy of of squid (like most of this
142 * new IO code). This routine handles the stuff we've hidden in
143 * comm_setselect and fd_table[] and calls callbacks for IO ready
144 * events.
145 */
146 void
147 comm_select(void)
148 {
149 int num, ci;
150 void (*hdl)(fde_t *, void *);
151 fde_t *F;
152
153 num = poll(pollfds, pollnum, SELECT_DELAY);
154
155 set_time();
156
157 if (num < 0)
158 {
159 const struct timespec req = { .tv_sec = 0, .tv_nsec = 50000000 };
160 nanosleep(&req, NULL); /* Avoid 99% CPU in comm_select */
161 return;
162 }
163
164 for (ci = 0; ci < pollnum && num > 0; ci++)
165 {
166 int revents = pollfds[ci].revents;
167
168 if (revents == 0)
169 continue;
170 num--;
171
172 F = lookup_fd(pollfds[ci].fd);
173 assert(F);
174 if (!F->flags.open)
175 continue;
176
177 if (revents & (POLLRDNORM | POLLIN | POLLHUP | POLLERR))
178 {
179 if ((hdl = F->read_handler))
180 {
181 F->read_handler = NULL;
182 hdl(F, F->read_data);
183 if (!F->flags.open)
184 continue;
185 }
186 }
187
188 if (revents & (POLLWRNORM | POLLOUT | POLLHUP | POLLERR))
189 {
190 if ((hdl = F->write_handler))
191 {
192 F->write_handler = NULL;
193 hdl(F, F->write_data);
194 if (!F->flags.open)
195 continue;
196 }
197 }
198
199 comm_setselect(F, 0, NULL, NULL, 0);
200 }
201 }
202 #endif

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