/[svn]/ircd-hybrid-7.2/src/s_bsd_kqueue.c
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Contents of /ircd-hybrid-7.2/src/s_bsd_kqueue.c

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Revision 34 - (show annotations)
Sun Oct 2 21:05:51 2005 UTC (14 years, 11 months ago) by lusky
File MIME type: text/x-chdr
File size: 4931 byte(s)
create 7.2 branch, we can move/rename it as needed.


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 #include <sys/event.h>
28 #include "fdlist.h"
29 #include "ircd.h"
30 #include "memory.h"
31 #include "s_bsd.h"
32 #include "s_log.h"
33
34 #define KE_LENGTH 128
35
36 /* jlemon goofed up and didn't add EV_SET until fbsd 4.3 */
37
38 #ifndef EV_SET
39 #define EV_SET(kevp, a, b, c, d, e, f) do { \
40 (kevp)->ident = (a); \
41 (kevp)->filter = (b); \
42 (kevp)->flags = (c); \
43 (kevp)->fflags = (d); \
44 (kevp)->data = (e); \
45 (kevp)->udata = (f); \
46 } while(0)
47 #endif
48
49 static fde_t kqfd;
50 static struct kevent kq_fdlist[KE_LENGTH]; /* kevent buffer */
51 static int kqoff; /* offset into the buffer */
52 void init_netio(void);
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(L_CRIT, "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 kevent(kqfd.fd, kq_fdlist, kqoff, NULL, 0, &zero_timespec);
88 kqoff = 0;
89 }
90 else
91 kqoff++;
92 }
93
94 /*
95 * comm_setselect
96 *
97 * This is a needed exported function which will be called to register
98 * and deregister interest in a pending IO state for a given FD.
99 */
100 void
101 comm_setselect(fde_t *F, unsigned int type, PF *handler,
102 void *client_data, time_t timeout)
103 {
104 int new_events, diff;
105
106 if ((type & COMM_SELECT_READ))
107 {
108 F->read_handler = handler;
109 F->read_data = client_data;
110 }
111
112 if ((type & COMM_SELECT_WRITE))
113 {
114 F->write_handler = handler;
115 F->write_data = client_data;
116 }
117
118 new_events = (F->read_handler ? COMM_SELECT_READ : 0) |
119 (F->write_handler ? COMM_SELECT_WRITE : 0);
120
121 if (timeout != 0)
122 F->timeout = CurrentTime + (timeout / 1000);
123
124 diff = new_events ^ F->evcache;
125
126 if ((diff & COMM_SELECT_READ))
127 kq_update_events(F->fd, EVFILT_READ,
128 (new_events & COMM_SELECT_READ) ? EV_ADD : EV_DELETE);
129 if ((diff & COMM_SELECT_WRITE))
130 kq_update_events(F->fd, EVFILT_WRITE,
131 (new_events & COMM_SELECT_WRITE) ? EV_ADD : EV_DELETE);
132
133 F->evcache = new_events;
134 }
135
136 /*
137 * comm_select
138 *
139 * Called to do the new-style IO, courtesy of squid (like most of this
140 * new IO code). This routine handles the stuff we've hidden in
141 * comm_setselect and fd_table[] and calls callbacks for IO ready
142 * events.
143 */
144 void
145 comm_select(void)
146 {
147 int num, i;
148 static struct kevent ke[KE_LENGTH];
149 struct timespec poll_time;
150 PF *hdl;
151 fde_t *F;
152
153 /*
154 * remember we are doing NANOseconds here, not micro/milli. God knows
155 * why jlemon used a timespec, but hey, he wrote the interface, not I
156 * -- Adrian
157 */
158 poll_time.tv_sec = 0;
159 poll_time.tv_nsec = SELECT_DELAY * 1000000;
160 num = kevent(kqfd.fd, kq_fdlist, kqoff, ke, KE_LENGTH, &poll_time);
161 kqoff = 0;
162
163 set_time();
164
165 if (num < 0)
166 {
167 #ifdef HAVE_USLEEP
168 usleep(50000); /* avoid 99% CPU in comm_select */
169 #endif
170 return;
171 }
172
173 for (i = 0; i < num; i++)
174 {
175 F = lookup_fd(ke[i].ident);
176 if (F == NULL || !F->flags.open || (ke[i].flags & EV_ERROR))
177 continue;
178
179 if (ke[i].filter == EVFILT_READ)
180 if ((hdl = F->read_handler) != NULL)
181 {
182 F->read_handler = NULL;
183 hdl(F, F->read_data);
184 if (!F->flags.open)
185 continue;
186 }
187
188 if (ke[i].filter == EVFILT_WRITE)
189 if ((hdl = F->write_handler) != NULL)
190 {
191 F->write_handler = NULL;
192 hdl(F, F->write_data);
193 if (!F->flags.open)
194 continue;
195 }
196
197 comm_setselect(F, 0, NULL, NULL, 0);
198 }
199 }

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