/[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 908 - (show annotations)
Sun Nov 4 23:21:51 2007 UTC (13 years, 4 months ago) by stu
File MIME type: text/x-chdr
File size: 4974 byte(s)
Completely redo the build system.  Now uses libtool and automake.  Suggest you clean out your tree and then do ./autogen.sh.
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 "s_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 void init_netio(void);
54
55 /*
56 * init_netio
57 *
58 * This is a needed exported function which will be called to initialise
59 * the network loop code.
60 */
61 void
62 init_netio(void)
63 {
64 int fd;
65
66 if ((fd = kqueue()) < 0)
67 {
68 ilog(L_CRIT, "init_netio: Couldn't open kqueue fd!");
69 exit(115); /* Whee! */
70 }
71
72 fd_open(&kqfd, fd, 0, "kqueue() file descriptor");
73 }
74
75 /*
76 * Write a single update to the kqueue list.
77 */
78 static void
79 kq_update_events(int fd, int filter, int what)
80 {
81 static struct timespec zero_timespec = {0, 0};
82 struct kevent *kep = kq_fdlist + kqoff;
83
84 EV_SET(kep, (uintptr_t) fd, (short) filter, what, 0, 0, NULL);
85
86 if (++kqoff == KE_LENGTH)
87 {
88 kevent(kqfd.fd, kq_fdlist, kqoff, NULL, 0, &zero_timespec);
89 kqoff = 0;
90 }
91 }
92
93 /*
94 * comm_setselect
95 *
96 * This is a needed exported function which will be called to register
97 * and deregister interest in a pending IO state for a given FD.
98 */
99 void
100 comm_setselect(fde_t *F, unsigned int type, PF *handler,
101 void *client_data, time_t timeout)
102 {
103 int new_events, diff;
104
105 if ((type & COMM_SELECT_READ))
106 {
107 F->read_handler = handler;
108 F->read_data = client_data;
109 }
110
111 if ((type & COMM_SELECT_WRITE))
112 {
113 F->write_handler = handler;
114 F->write_data = client_data;
115 }
116
117 new_events = (F->read_handler ? COMM_SELECT_READ : 0) |
118 (F->write_handler ? COMM_SELECT_WRITE : 0);
119
120 if (timeout != 0)
121 F->timeout = CurrentTime + (timeout / 1000);
122
123 diff = new_events ^ F->evcache;
124
125 if ((diff & COMM_SELECT_READ))
126 kq_update_events(F->fd, EVFILT_READ,
127 (new_events & COMM_SELECT_READ) ? EV_ADD : EV_DELETE);
128 if ((diff & COMM_SELECT_WRITE))
129 kq_update_events(F->fd, EVFILT_WRITE,
130 (new_events & COMM_SELECT_WRITE) ? EV_ADD : EV_DELETE);
131
132 F->evcache = new_events;
133 }
134
135 /*
136 * comm_select
137 *
138 * Called to do the new-style IO, courtesy of squid (like most of this
139 * new IO code). This routine handles the stuff we've hidden in
140 * comm_setselect and fd_table[] and calls callbacks for IO ready
141 * events.
142 */
143 void
144 comm_select(void)
145 {
146 int num, i;
147 static struct kevent ke[KE_LENGTH];
148 struct timespec poll_time;
149 PF *hdl;
150 fde_t *F;
151
152 /*
153 * remember we are doing NANOseconds here, not micro/milli. God knows
154 * why jlemon used a timespec, but hey, he wrote the interface, not I
155 * -- Adrian
156 */
157 poll_time.tv_sec = 0;
158 poll_time.tv_nsec = SELECT_DELAY * 1000000;
159 num = kevent(kqfd.fd, kq_fdlist, kqoff, ke, KE_LENGTH, &poll_time);
160 kqoff = 0;
161
162 set_time();
163
164 if (num < 0)
165 {
166 #ifdef HAVE_USLEEP
167 usleep(50000); /* avoid 99% CPU in comm_select */
168 #endif
169 return;
170 }
171
172 for (i = 0; i < num; i++)
173 {
174 F = lookup_fd(ke[i].ident);
175 if (F == NULL || !F->flags.open || (ke[i].flags & EV_ERROR))
176 continue;
177
178 if (ke[i].filter == EVFILT_READ)
179 if ((hdl = F->read_handler) != NULL)
180 {
181 F->read_handler = NULL;
182 hdl(F, F->read_data);
183 if (!F->flags.open)
184 continue;
185 }
186
187 if (ke[i].filter == EVFILT_WRITE)
188 if ((hdl = F->write_handler) != NULL)
189 {
190 F->write_handler = NULL;
191 hdl(F, F->write_data);
192 if (!F->flags.open)
193 continue;
194 }
195
196 comm_setselect(F, 0, NULL, NULL, 0);
197 }
198 }
199 #endif

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