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92b9f1fd | 1 | |
2 | /* | |
d9088c69 | 3 | * $Id: comm_kqueue.cc,v 1.12 2006/09/02 10:43:10 adrian Exp $ |
92b9f1fd | 4 | * |
5 | * DEBUG: section 5 Socket functions | |
6 | * | |
7 | * SQUID Web Proxy Cache http://www.squid-cache.org/ | |
8 | * ---------------------------------------------------------- | |
9 | * | |
10 | * Squid is the result of efforts by numerous individuals from | |
11 | * the Internet community; see the CONTRIBUTORS file for full | |
12 | * details. Many organizations have provided support for Squid's | |
13 | * development; see the SPONSORS file for full details. Squid is | |
14 | * Copyrighted (C) 2001 by the Regents of the University of | |
15 | * California; see the COPYRIGHT file for full details. Squid | |
16 | * incorporates software developed and/or copyrighted by other | |
17 | * sources; see the CREDITS file for full details. | |
18 | * | |
19 | * This program is free software; you can redistribute it and/or modify | |
20 | * it under the terms of the GNU General Public License as published by | |
21 | * the Free Software Foundation; either version 2 of the License, or | |
22 | * (at your option) any later version. | |
23 | * | |
24 | * This program is distributed in the hope that it will be useful, | |
25 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
26 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
27 | * GNU General Public License for more details. | |
28 | * | |
29 | * You should have received a copy of the GNU General Public License | |
30 | * along with this program; if not, write to the Free Software | |
31 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. | |
32 | * | |
33 | */ | |
34 | ||
35 | /* | |
36 | * This code was originally written by Benno Rice and hacked on quite | |
37 | * a bit by Adrian. Adrian then took it to the hybrid-ircd project to use | |
38 | * in their new IO subsystem. After a year of modifications and some | |
39 | * rather interesting changes (event aggregation) its back in squid. | |
40 | * Thanks to the ircd-hybrid guys. | |
41 | */ | |
42 | ||
43 | /* | |
44 | * XXX Currently not implemented / supported by this module XXX | |
45 | * | |
46 | * - delay pools | |
47 | * - deferred reads | |
48 | * | |
49 | * So, its not entirely useful in a production setup since if a read | |
50 | * is meant to be deferred it isn't (we're not even throwing the event | |
51 | * away here). Eventually the rest of the code will be rewritten | |
52 | * so deferred reads aren't required. | |
53 | * -- adrian | |
54 | */ | |
55 | ||
56 | #include "squid.h" | |
62ee09ca | 57 | #include "comm_kqueue.h" |
58 | #include "CacheManager.h" | |
e6ccf245 | 59 | #include "Store.h" |
f0d40406 | 60 | #include "fde.h" |
a4452e04 | 61 | #include "SquidTime.h" |
92b9f1fd | 62 | |
63 | #ifdef USE_KQUEUE | |
64 | ||
65 | #include <sys/event.h> | |
66 | ||
67 | ||
71b7abe0 | 68 | #define KE_LENGTH 128 |
92b9f1fd | 69 | |
70 | /* jlemon goofed up and didn't add EV_SET until fbsd 4.3 */ | |
71 | ||
72 | #ifndef EV_SET | |
73 | #define EV_SET(kevp, a, b, c, d, e, f) do { \ | |
74 | (kevp)->ident = (a); \ | |
75 | (kevp)->filter = (b); \ | |
76 | (kevp)->flags = (c); \ | |
77 | (kevp)->fflags = (d); \ | |
78 | (kevp)->data = (e); \ | |
79 | (kevp)->udata = (f); \ | |
80 | } while(0) | |
81 | #endif | |
82 | ||
83 | static void kq_update_events(int, short, PF *); | |
84 | static int kq; | |
62e76326 | 85 | |
92b9f1fd | 86 | static struct timespec zero_timespec; |
87 | ||
71b7abe0 | 88 | static struct kevent *kqlst; /* kevent buffer */ |
89 | static int kqmax; /* max structs to buffer */ | |
90 | static int kqoff; /* offset into the buffer */ | |
50198132 | 91 | static int max_poll_time = 1000; |
92b9f1fd | 92 | |
93 | ||
94 | /* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */ | |
95 | /* Private functions */ | |
96 | ||
97 | void | |
98 | kq_update_events(int fd, short filter, PF * handler) | |
99 | { | |
100 | PF *cur_handler; | |
101 | int kep_flags; | |
102 | ||
103 | #if 0 | |
62e76326 | 104 | |
92b9f1fd | 105 | int retval; |
106 | #endif | |
107 | ||
108 | switch (filter) { | |
62e76326 | 109 | |
92b9f1fd | 110 | case EVFILT_READ: |
71b7abe0 | 111 | cur_handler = fd_table[fd].read_handler; |
112 | break; | |
62e76326 | 113 | |
92b9f1fd | 114 | case EVFILT_WRITE: |
71b7abe0 | 115 | cur_handler = fd_table[fd].write_handler; |
116 | break; | |
62e76326 | 117 | |
92b9f1fd | 118 | default: |
71b7abe0 | 119 | /* XXX bad! -- adrian */ |
120 | return; | |
121 | break; | |
92b9f1fd | 122 | } |
123 | ||
124 | if ((cur_handler == NULL && handler != NULL) | |
62e76326 | 125 | || (cur_handler != NULL && handler == NULL)) { |
126 | ||
71b7abe0 | 127 | struct kevent *kep; |
128 | ||
129 | kep = kqlst + kqoff; | |
130 | ||
131 | if (handler != NULL) { | |
132 | kep_flags = (EV_ADD | EV_ONESHOT); | |
133 | } else { | |
134 | kep_flags = EV_DELETE; | |
135 | } | |
136 | ||
137 | EV_SET(kep, (uintptr_t) fd, filter, kep_flags, 0, 0, 0); | |
138 | ||
139 | if (kqoff == kqmax) { | |
140 | int ret; | |
141 | ||
142 | ret = kevent(kq, kqlst, kqoff, NULL, 0, &zero_timespec); | |
143 | /* jdc -- someone needs to do error checking... */ | |
62e76326 | 144 | |
71b7abe0 | 145 | if (ret == -1) { |
146 | perror("kq_update_events(): kevent()"); | |
147 | return; | |
148 | } | |
62e76326 | 149 | |
71b7abe0 | 150 | kqoff = 0; |
151 | } else { | |
152 | kqoff++; | |
153 | } | |
62e76326 | 154 | |
92b9f1fd | 155 | #if 0 |
71b7abe0 | 156 | if (retval < 0) { |
157 | /* Error! */ | |
62e76326 | 158 | |
71b7abe0 | 159 | if (ke.flags & EV_ERROR) { |
160 | errno = ke.data; | |
161 | } | |
162 | } | |
62e76326 | 163 | |
92b9f1fd | 164 | #endif |
62e76326 | 165 | |
92b9f1fd | 166 | } |
167 | } | |
168 | ||
169 | ||
170 | ||
171 | /* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */ | |
172 | /* Public functions */ | |
173 | ||
174 | ||
175 | /* | |
176 | * comm_select_init | |
177 | * | |
178 | * This is a needed exported function which will be called to initialise | |
179 | * the network loop code. | |
180 | */ | |
181 | void | |
182 | comm_select_init(void) | |
183 | { | |
184 | kq = kqueue(); | |
62e76326 | 185 | |
92b9f1fd | 186 | if (kq < 0) { |
71b7abe0 | 187 | fatal("comm_select_init: Couldn't open kqueue fd!\n"); |
92b9f1fd | 188 | } |
62e76326 | 189 | |
92b9f1fd | 190 | kqmax = getdtablesize(); |
62e76326 | 191 | |
50198132 | 192 | kqlst = (struct kevent *)xmalloc(sizeof(*kqlst) * kqmax); |
92b9f1fd | 193 | zero_timespec.tv_sec = 0; |
194 | zero_timespec.tv_nsec = 0; | |
195 | } | |
196 | ||
197 | /* | |
198 | * comm_setselect | |
199 | * | |
200 | * This is a needed exported function which will be called to register | |
201 | * and deregister interest in a pending IO state for a given FD. | |
202 | */ | |
203 | void | |
204 | commSetSelect(int fd, unsigned int type, PF * handler, | |
62e76326 | 205 | void *client_data, time_t timeout) |
92b9f1fd | 206 | { |
207 | fde *F = &fd_table[fd]; | |
208 | assert(fd >= 0); | |
209 | assert(F->flags.open); | |
210 | ||
211 | if (type & COMM_SELECT_READ) { | |
71b7abe0 | 212 | kq_update_events(fd, EVFILT_READ, handler); |
213 | F->read_handler = handler; | |
214 | F->read_data = client_data; | |
92b9f1fd | 215 | } |
62e76326 | 216 | |
92b9f1fd | 217 | if (type & COMM_SELECT_WRITE) { |
71b7abe0 | 218 | kq_update_events(fd, EVFILT_WRITE, handler); |
219 | F->write_handler = handler; | |
220 | F->write_data = client_data; | |
92b9f1fd | 221 | } |
62e76326 | 222 | |
92b9f1fd | 223 | if (timeout) |
71b7abe0 | 224 | F->timeout = squid_curtime + timeout; |
92b9f1fd | 225 | |
226 | } | |
227 | ||
228 | /* | |
229 | * Check all connections for new connections and input data that is to be | |
230 | * processed. Also check for connections with data queued and whether we can | |
231 | * write it out. | |
232 | */ | |
233 | ||
234 | /* | |
235 | * comm_select | |
236 | * | |
237 | * Called to do the new-style IO, courtesy of of squid (like most of this | |
238 | * new IO code). This routine handles the stuff we've hidden in | |
239 | * comm_setselect and fd_table[] and calls callbacks for IO ready | |
240 | * events. | |
241 | */ | |
242 | ||
3d7e9d7c | 243 | comm_err_t |
92b9f1fd | 244 | comm_select(int msec) |
245 | { | |
246 | int num, i; | |
62e76326 | 247 | |
92b9f1fd | 248 | static struct kevent ke[KE_LENGTH]; |
62e76326 | 249 | |
92b9f1fd | 250 | struct timespec poll_time; |
251 | ||
3de50fcd | 252 | /* |
253 | * remember we are doing NANOseconds here, not micro/milli. God knows | |
254 | * why jlemon used a timespec, but hey, he wrote the interface, not I | |
255 | * -- Adrian | |
256 | */ | |
62e76326 | 257 | |
50198132 | 258 | if (msec > max_poll_time) |
259 | msec = max_poll_time; | |
62e76326 | 260 | |
3de50fcd | 261 | poll_time.tv_sec = msec / 1000; |
62e76326 | 262 | |
3de50fcd | 263 | poll_time.tv_nsec = (msec % 1000) * 1000000; |
62e76326 | 264 | |
3de50fcd | 265 | for (;;) { |
266 | num = kevent(kq, kqlst, kqoff, ke, KE_LENGTH, &poll_time); | |
267 | statCounter.select_loops++; | |
268 | kqoff = 0; | |
62e76326 | 269 | |
3de50fcd | 270 | if (num >= 0) |
271 | break; | |
62e76326 | 272 | |
3de50fcd | 273 | if (ignoreErrno(errno)) |
274 | break; | |
62e76326 | 275 | |
71b7abe0 | 276 | getCurrentTime(); |
62e76326 | 277 | |
3de50fcd | 278 | return COMM_ERROR; |
62e76326 | 279 | |
3de50fcd | 280 | /* NOTREACHED */ |
281 | } | |
282 | ||
283 | getCurrentTime(); | |
62e76326 | 284 | |
3de50fcd | 285 | if (num == 0) |
50198132 | 286 | return COMM_OK; /* No error.. */ |
3de50fcd | 287 | |
288 | for (i = 0; i < num; i++) { | |
289 | int fd = (int) ke[i].ident; | |
290 | PF *hdl = NULL; | |
291 | fde *F = &fd_table[fd]; | |
292 | ||
293 | if (ke[i].flags & EV_ERROR) { | |
294 | errno = ke[i].data; | |
295 | /* XXX error == bad! -- adrian */ | |
296 | continue; /* XXX! */ | |
297 | } | |
62e76326 | 298 | |
3de50fcd | 299 | switch (ke[i].filter) { |
62e76326 | 300 | |
301 | case EVFILT_READ: | |
302 | ||
303 | if ((hdl = F->read_handler) != NULL) { | |
304 | F->read_handler = NULL; | |
305 | hdl(fd, F->read_data); | |
306 | } | |
307 | ||
308 | break; | |
309 | ||
310 | case EVFILT_WRITE: | |
311 | ||
312 | if ((hdl = F->write_handler) != NULL) { | |
313 | F->write_handler = NULL; | |
314 | hdl(fd, F->write_data); | |
315 | } | |
316 | ||
317 | break; | |
318 | ||
319 | default: | |
320 | /* Bad! -- adrian */ | |
321 | debug(5, 1) ("comm_select: kevent returned %d!\n", ke[i].filter); | |
322 | break; | |
71b7abe0 | 323 | } |
92b9f1fd | 324 | } |
62e76326 | 325 | |
3de50fcd | 326 | return COMM_OK; |
92b9f1fd | 327 | } |
328 | ||
50198132 | 329 | void |
330 | comm_quick_poll_required(void) | |
331 | { | |
332 | max_poll_time = 100; | |
333 | } | |
334 | ||
d9088c69 | 335 | void |
336 | commKQueueRegisterWithCacheManager(CacheManager & manager) | |
337 | { | |
338 | } | |
339 | ||
92b9f1fd | 340 | #endif /* USE_KQUEUE */ |