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

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Revision 2614 - (show annotations)
Mon Dec 2 18:20:23 2013 UTC (8 years, 11 months ago) by michael
File MIME type: text/x-chdr
File size: 5030 byte(s)
- src/s_bsd_kqueue.c: removed redundant init_netio() prototype; fixed indentation

1 /*
2 * ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
3 * s_bsd_kqueue.c: FreeBSD kqueue compatible network routines.
4 *
5 * Originally by Adrian Chadd <adrian@creative.net.au>
6 * Copyright (C) 2005 Hybrid Development Team
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
21 * USA
22 *
23 * $Id$
24 */
25
26 #include "stdinc.h"
27 #if USE_IOPOLL_MECHANISM == __IOPOLL_MECHANISM_KQUEUE
28 #include <sys/event.h>
29 #include "fdlist.h"
30 #include "ircd.h"
31 #include "memory.h"
32 #include "s_bsd.h"
33 #include "log.h"
34
35 #define KE_LENGTH 128
36
37 /* jlemon goofed up and didn't add EV_SET until fbsd 4.3 */
38
39 #ifndef EV_SET
40 #define EV_SET(kevp, a, b, c, d, e, f) do { \
41 (kevp)->ident = (a); \
42 (kevp)->filter = (b); \
43 (kevp)->flags = (c); \
44 (kevp)->fflags = (d); \
45 (kevp)->data = (e); \
46 (kevp)->udata = (f); \
47 } while(0)
48 #endif
49
50 static fde_t kqfd;
51 static struct kevent kq_fdlist[KE_LENGTH]; /* kevent buffer */
52 static int kqoff; /* offset into the buffer */
53
54 /*
55 * init_netio
56 *
57 * This is a needed exported function which will be called to initialise
58 * the network loop code.
59 */
60 void
61 init_netio(void)
62 {
63 int fd;
64
65 if ((fd = kqueue()) < 0)
66 {
67 ilog(LOG_TYPE_IRCD, "init_netio: Couldn't open kqueue fd!");
68 exit(115); /* Whee! */
69 }
70
71 fd_open(&kqfd, fd, 0, "kqueue() file descriptor");
72 }
73
74 /*
75 * Write a single update to the kqueue list.
76 */
77 static void
78 kq_update_events(int fd, int filter, int what)
79 {
80 static struct timespec zero_timespec = {0, 0};
81 struct kevent *kep = kq_fdlist + kqoff;
82
83 EV_SET(kep, (uintptr_t) fd, (short) filter, what, 0, 0, NULL);
84
85 if (++kqoff == KE_LENGTH)
86 {
87 int i;
88
89 for (i = 0; i < kqoff; ++i)
90 kevent(kqfd.fd, &kq_fdlist[i], 1, NULL, 0, &zero_timespec);
91 kqoff = 0;
92 }
93 }
94
95 /*
96 * comm_setselect
97 *
98 * This is a needed exported function which will be called to register
99 * and deregister interest in a pending IO state for a given FD.
100 */
101 void
102 comm_setselect(fde_t *F, unsigned int type, PF *handler,
103 void *client_data, time_t timeout)
104 {
105 int new_events, diff;
106
107 if ((type & COMM_SELECT_READ))
108 {
109 F->read_handler = handler;
110 F->read_data = client_data;
111 }
112
113 if ((type & COMM_SELECT_WRITE))
114 {
115 F->write_handler = handler;
116 F->write_data = client_data;
117 }
118
119 new_events = (F->read_handler ? COMM_SELECT_READ : 0) |
120 (F->write_handler ? COMM_SELECT_WRITE : 0);
121
122 if (timeout != 0)
123 F->timeout = CurrentTime + (timeout / 1000);
124
125 diff = new_events ^ F->evcache;
126
127 if ((diff & COMM_SELECT_READ))
128 kq_update_events(F->fd, EVFILT_READ,
129 (new_events & COMM_SELECT_READ) ? EV_ADD : EV_DELETE);
130 if ((diff & COMM_SELECT_WRITE))
131 kq_update_events(F->fd, EVFILT_WRITE,
132 (new_events & COMM_SELECT_WRITE) ? EV_ADD : EV_DELETE);
133
134 F->evcache = new_events;
135 }
136
137 /*
138 * comm_select
139 *
140 * Called to do the new-style IO, courtesy of squid (like most of this
141 * new IO code). This routine handles the stuff we've hidden in
142 * comm_setselect and fd_table[] and calls callbacks for IO ready
143 * events.
144 */
145 void
146 comm_select(void)
147 {
148 int num, i;
149 static struct kevent ke[KE_LENGTH];
150 struct timespec poll_time;
151 PF *hdl;
152 fde_t *F;
153
154 /*
155 * remember we are doing NANOseconds here, not micro/milli. God knows
156 * why jlemon used a timespec, but hey, he wrote the interface, not I
157 * -- Adrian
158 */
159 poll_time.tv_sec = 0;
160 poll_time.tv_nsec = SELECT_DELAY * 1000000;
161 num = kevent(kqfd.fd, kq_fdlist, kqoff, ke, KE_LENGTH, &poll_time);
162 kqoff = 0;
163
164 set_time();
165
166 if (num < 0)
167 {
168 #ifdef HAVE_USLEEP
169 usleep(50000); /* avoid 99% CPU in comm_select */
170 #endif
171 return;
172 }
173
174 for (i = 0; i < num; i++)
175 {
176 F = lookup_fd(ke[i].ident);
177 if (F == NULL || !F->flags.open || (ke[i].flags & EV_ERROR))
178 continue;
179
180 if (ke[i].filter == EVFILT_READ)
181 if ((hdl = F->read_handler) != NULL)
182 {
183 F->read_handler = NULL;
184 hdl(F, F->read_data);
185 if (!F->flags.open)
186 continue;
187 }
188
189 if (ke[i].filter == EVFILT_WRITE)
190 if ((hdl = F->write_handler) != NULL)
191 {
192 F->write_handler = NULL;
193 hdl(F, F->write_data);
194 if (!F->flags.open)
195 continue;
196 }
197
198 comm_setselect(F, 0, NULL, NULL, 0);
199 }
200 }
201 #endif

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