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663c0a38 | 1 | /* |
b510f3a1 | 2 | * DEBUG: section 05 Socket Functions |
663c0a38 | 3 | * |
4 | * SQUID Web Proxy Cache http://www.squid-cache.org/ | |
5 | * ---------------------------------------------------------- | |
6 | * | |
7 | * Squid is the result of efforts by numerous individuals from | |
8 | * the Internet community; see the CONTRIBUTORS file for full | |
9 | * details. Many organizations have provided support for Squid's | |
10 | * development; see the SPONSORS file for full details. Squid is | |
11 | * Copyrighted (C) 2001 by the Regents of the University of | |
12 | * California; see the COPYRIGHT file for full details. Squid | |
13 | * incorporates software developed and/or copyrighted by other | |
14 | * sources; see the CREDITS file for full details. | |
15 | * | |
16 | * This program is free software; you can redistribute it and/or modify | |
17 | * it under the terms of the GNU General Public License as published by | |
18 | * the Free Software Foundation; either version 2 of the License, or | |
19 | * (at your option) any later version. | |
26ac0430 | 20 | * |
663c0a38 | 21 | * This program is distributed in the hope that it will be useful, |
22 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
23 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
24 | * GNU General Public License for more details. | |
26ac0430 | 25 | * |
663c0a38 | 26 | * You should have received a copy of the GNU General Public License |
27 | * along with this program; if not, write to the Free Software | |
28 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. | |
29 | * | |
30 | */ | |
f7f3304a | 31 | #include "squid.h" |
d841c88d AJ |
32 | |
33 | #if USE_SELECT_WIN32 | |
65d448bc | 34 | #include "anyp/PortCfg.h" |
f8171fc7 | 35 | #include "comm/Connection.h" |
d841c88d AJ |
36 | #include "comm/Loops.h" |
37 | #include "fde.h" | |
f8171fc7 | 38 | #include "ICP.h" |
8822ebee | 39 | #include "mgr/Registration.h" |
663c0a38 | 40 | #include "SquidTime.h" |
e1656dc4 | 41 | #include "StatCounters.h" |
00a7574e | 42 | #include "StatHist.h" |
663c0a38 | 43 | #include "Store.h" |
663c0a38 | 44 | |
1a30fdf5 | 45 | #include <cerrno> |
21d845b1 | 46 | |
d841c88d | 47 | static int MAX_POLL_TIME = 1000; /* see also Comm::QuickPollRequired() */ |
663c0a38 | 48 | |
49 | #ifndef howmany | |
50 | #define howmany(x, y) (((x)+((y)-1))/(y)) | |
51 | #endif | |
52 | #ifndef NBBY | |
53 | #define NBBY 8 | |
54 | #endif | |
55 | #define FD_MASK_BYTES sizeof(fd_mask) | |
56 | #define FD_MASK_BITS (FD_MASK_BYTES*NBBY) | |
57 | ||
58 | /* STATIC */ | |
59 | static int examine_select(fd_set *, fd_set *); | |
65d448bc AJ |
60 | static int fdIsTcpListener(int fd); |
61 | static int fdIsUdpListener(int fd); | |
663c0a38 | 62 | static int fdIsDns(int fd); |
63 | static OBJH commIncomingStats; | |
64 | static int comm_check_incoming_select_handlers(int nfds, int *fds); | |
65 | static void comm_select_dns_incoming(void); | |
66 | static void commUpdateReadBits(int fd, PF * handler); | |
67 | static void commUpdateWriteBits(int fd, PF * handler); | |
68 | ||
663c0a38 | 69 | static struct timeval zero_tv; |
70 | static fd_set global_readfds; | |
71 | static fd_set global_writefds; | |
72 | static int nreadfds; | |
73 | static int nwritefds; | |
74 | ||
75 | /* | |
76 | * Automatic tuning for incoming requests: | |
77 | * | |
78 | * INCOMING sockets are the ICP and HTTP ports. We need to check these | |
79 | * fairly regularly, but how often? When the load increases, we | |
80 | * want to check the incoming sockets more often. If we have a lot | |
81 | * of incoming ICP, then we need to check these sockets more than | |
82 | * if we just have HTTP. | |
83 | * | |
65d448bc | 84 | * The variables 'incoming_udp_interval' and 'incoming_tcp_interval' |
663c0a38 | 85 | * determine how many normal I/O events to process before checking |
86 | * incoming sockets again. Note we store the incoming_interval | |
87 | * multipled by a factor of (2^INCOMING_FACTOR) to have some | |
88 | * pseudo-floating point precision. | |
89 | * | |
65d448bc | 90 | * The variable 'udp_io_events' and 'tcp_io_events' counts how many normal |
663c0a38 | 91 | * I/O events have been processed since the last check on the incoming |
92 | * sockets. When io_events > incoming_interval, its time to check incoming | |
93 | * sockets. | |
94 | * | |
95 | * Every time we check incoming sockets, we count how many new messages | |
96 | * or connections were processed. This is used to adjust the | |
97 | * incoming_interval for the next iteration. The new incoming_interval | |
98 | * is calculated as the current incoming_interval plus what we would | |
99 | * like to see as an average number of events minus the number of | |
100 | * events just processed. | |
101 | * | |
102 | * incoming_interval = incoming_interval + target_average - number_of_events_processed | |
103 | * | |
65d448bc | 104 | * There are separate incoming_interval counters for DNS, UDP and TCP events |
26ac0430 | 105 | * |
663c0a38 | 106 | * You can see the current values of the incoming_interval's, as well as |
107 | * a histogram of 'incoming_events' by asking the cache manager | |
108 | * for 'comm_incoming', e.g.: | |
109 | * | |
110 | * % ./client mgr:comm_incoming | |
111 | * | |
112 | * Caveats: | |
113 | * | |
114 | * - We have MAX_INCOMING_INTEGER as a magic upper limit on | |
115 | * incoming_interval for both types of sockets. At the | |
116 | * largest value the cache will effectively be idling. | |
117 | * | |
118 | * - The higher the INCOMING_FACTOR, the slower the algorithm will | |
119 | * respond to load spikes/increases/decreases in demand. A value | |
120 | * between 3 and 8 is recommended. | |
121 | */ | |
122 | ||
123 | #define MAX_INCOMING_INTEGER 256 | |
124 | #define INCOMING_FACTOR 5 | |
125 | #define MAX_INCOMING_INTERVAL (MAX_INCOMING_INTEGER << INCOMING_FACTOR) | |
65d448bc | 126 | static int udp_io_events = 0; |
663c0a38 | 127 | static int dns_io_events = 0; |
65d448bc AJ |
128 | static int tcp_io_events = 0; |
129 | static int incoming_udp_interval = 16 << INCOMING_FACTOR; | |
663c0a38 | 130 | static int incoming_dns_interval = 16 << INCOMING_FACTOR; |
65d448bc AJ |
131 | static int incoming_tcp_interval = 16 << INCOMING_FACTOR; |
132 | #define commCheckUdpIncoming (++udp_io_events > (incoming_udp_interval>> INCOMING_FACTOR)) | |
133 | #define commCheckDnsIncoming (++dns_io_events > (incoming_dns_interval>> INCOMING_FACTOR)) | |
134 | #define commCheckTcpIncoming (++tcp_io_events > (incoming_tcp_interval>> INCOMING_FACTOR)) | |
663c0a38 | 135 | |
136 | void | |
d841c88d | 137 | Comm::SetSelect(int fd, unsigned int type, PF * handler, void *client_data, time_t timeout) |
663c0a38 | 138 | { |
139 | fde *F = &fd_table[fd]; | |
140 | assert(fd >= 0); | |
141 | assert(F->flags.open); | |
48e7baac AJ |
142 | debugs(5, 5, HERE << "FD " << fd << ", type=" << type << |
143 | ", handler=" << handler << ", client_data=" << client_data << | |
144 | ", timeout=" << timeout); | |
663c0a38 | 145 | |
146 | if (type & COMM_SELECT_READ) { | |
147 | F->read_handler = handler; | |
148 | F->read_data = client_data; | |
149 | commUpdateReadBits(fd, handler); | |
150 | } | |
151 | ||
152 | if (type & COMM_SELECT_WRITE) { | |
153 | F->write_handler = handler; | |
154 | F->write_data = client_data; | |
155 | commUpdateWriteBits(fd, handler); | |
156 | } | |
157 | ||
158 | if (timeout) | |
159 | F->timeout = squid_curtime + timeout; | |
160 | } | |
161 | ||
3a5a4930 | 162 | void |
d841c88d | 163 | Comm::ResetSelect(int fd) |
3a5a4930 | 164 | { |
165 | } | |
166 | ||
663c0a38 | 167 | static int |
65d448bc | 168 | fdIsUdpListener(int fd) |
663c0a38 | 169 | { |
f8171fc7 | 170 | if (icpIncomingConn != NULL && fd == icpIncomingConn->fd) |
663c0a38 | 171 | return 1; |
172 | ||
f8171fc7 | 173 | if (icpOutgoingConn != NULL && fd == icpOutgoingConn->fd) |
663c0a38 | 174 | return 1; |
175 | ||
176 | return 0; | |
177 | } | |
178 | ||
179 | static int | |
180 | fdIsDns(int fd) | |
181 | { | |
4d6c8504 AJ |
182 | if (fd == DnsSocketA) |
183 | return 1; | |
184 | ||
185 | if (fd == DnsSocketB) | |
663c0a38 | 186 | return 1; |
187 | ||
188 | return 0; | |
189 | } | |
190 | ||
191 | static int | |
65d448bc | 192 | fdIsTcpListener(int fd) |
663c0a38 | 193 | { |
d00790b2 | 194 | for (AnyP::PortCfgPointer s = HttpPortList; s != NULL; s = s->next) { |
65d448bc | 195 | if (s->listenConn != NULL && s->listenConn->fd == fd) |
663c0a38 | 196 | return 1; |
197 | } | |
198 | ||
199 | return 0; | |
200 | } | |
201 | ||
663c0a38 | 202 | static int |
203 | comm_check_incoming_select_handlers(int nfds, int *fds) | |
204 | { | |
205 | int i; | |
206 | int fd; | |
207 | int maxfd = 0; | |
208 | PF *hdl = NULL; | |
209 | fd_set read_mask; | |
210 | fd_set write_mask; | |
211 | fd_set errfds; | |
212 | FD_ZERO(&errfds); | |
213 | FD_ZERO(&read_mask); | |
214 | FD_ZERO(&write_mask); | |
215 | incoming_sockets_accepted = 0; | |
216 | ||
a2f5277a | 217 | for (i = 0; i < nfds; ++i) { |
663c0a38 | 218 | fd = fds[i]; |
219 | ||
220 | if (fd_table[fd].read_handler) { | |
221 | FD_SET(fd, &read_mask); | |
222 | ||
223 | if (fd > maxfd) | |
224 | maxfd = fd; | |
225 | } | |
226 | ||
227 | if (fd_table[fd].write_handler) { | |
228 | FD_SET(fd, &write_mask); | |
229 | ||
230 | if (fd > maxfd) | |
231 | maxfd = fd; | |
232 | } | |
233 | } | |
234 | ||
235 | if (maxfd++ == 0) | |
236 | return -1; | |
237 | ||
238 | getCurrentTime(); | |
239 | ||
a2f5277a | 240 | ++ statCounter.syscalls.selects; |
663c0a38 | 241 | |
242 | if (select(maxfd, &read_mask, &write_mask, &errfds, &zero_tv) < 1) | |
243 | ||
244 | return incoming_sockets_accepted; | |
245 | ||
a2f5277a | 246 | for (i = 0; i < nfds; ++i) { |
663c0a38 | 247 | fd = fds[i]; |
248 | ||
08fb215c | 249 | if (FD_ISSET(fd, &read_mask)) { |
663c0a38 | 250 | if ((hdl = fd_table[fd].read_handler) != NULL) { |
251 | fd_table[fd].read_handler = NULL; | |
252 | commUpdateReadBits(fd, NULL); | |
253 | hdl(fd, fd_table[fd].read_data); | |
254 | } else { | |
e0236918 | 255 | debugs(5, DBG_IMPORTANT, "comm_select_incoming: FD " << fd << " NULL read handler"); |
663c0a38 | 256 | } |
257 | } | |
258 | ||
08fb215c | 259 | if (FD_ISSET(fd, &write_mask)) { |
663c0a38 | 260 | if ((hdl = fd_table[fd].write_handler) != NULL) { |
261 | fd_table[fd].write_handler = NULL; | |
262 | commUpdateWriteBits(fd, NULL); | |
263 | hdl(fd, fd_table[fd].write_data); | |
264 | } else { | |
e0236918 | 265 | debugs(5, DBG_IMPORTANT, "comm_select_incoming: FD " << fd << " NULL write handler"); |
663c0a38 | 266 | } |
267 | } | |
268 | } | |
269 | ||
270 | return incoming_sockets_accepted; | |
271 | } | |
272 | ||
273 | static void | |
65d448bc | 274 | comm_select_udp_incoming(void) |
663c0a38 | 275 | { |
276 | int nfds = 0; | |
277 | int fds[2]; | |
278 | int nevents; | |
65d448bc | 279 | udp_io_events = 0; |
663c0a38 | 280 | |
f207fe64 FC |
281 | if (Comm::IsConnOpen(icpIncomingConn)) { |
282 | fds[nfds] = icpIncomingConn->fd; | |
283 | ++nfds; | |
284 | } | |
663c0a38 | 285 | |
f207fe64 FC |
286 | if (Comm::IsConnOpen(icpOutgoingConn) && icpIncomingConn != icpOutgoingConn) { |
287 | fds[nfds] = icpOutgoingConn->fd; | |
288 | ++nfds; | |
289 | } | |
663c0a38 | 290 | |
291 | if (nfds == 0) | |
292 | return; | |
293 | ||
294 | nevents = comm_check_incoming_select_handlers(nfds, fds); | |
295 | ||
65d448bc | 296 | incoming_udp_interval += Config.comm_incoming.udp_average - nevents; |
663c0a38 | 297 | |
65d448bc AJ |
298 | if (incoming_udp_interval < 0) |
299 | incoming_udp_interval = 0; | |
663c0a38 | 300 | |
65d448bc AJ |
301 | if (incoming_udp_interval > MAX_INCOMING_INTERVAL) |
302 | incoming_udp_interval = MAX_INCOMING_INTERVAL; | |
663c0a38 | 303 | |
65d448bc AJ |
304 | if (nevents > INCOMING_UDP_MAX) |
305 | nevents = INCOMING_UDP_MAX; | |
663c0a38 | 306 | |
65d448bc | 307 | statCounter.comm_udp_incoming.count(nevents); |
663c0a38 | 308 | } |
309 | ||
310 | static void | |
65d448bc | 311 | comm_select_tcp_incoming(void) |
663c0a38 | 312 | { |
313 | int nfds = 0; | |
65d448bc | 314 | int fds[MAXTCPLISTENPORTS]; |
663c0a38 | 315 | int nevents; |
65d448bc | 316 | tcp_io_events = 0; |
663c0a38 | 317 | |
65d448bc | 318 | // XXX: only poll sockets that won't be deferred. But how do we identify them? |
663c0a38 | 319 | |
d00790b2 | 320 | for (AnyP::PortCfgPointer s = HttpPortList; s != NULL; s = s->next) { |
f207fe64 FC |
321 | if (Comm::IsConnOpen(s->listenConn)) { |
322 | fds[nfds] = s->listenConn->fd; | |
323 | ++nfds; | |
324 | } | |
663c0a38 | 325 | } |
326 | ||
327 | nevents = comm_check_incoming_select_handlers(nfds, fds); | |
65d448bc | 328 | incoming_tcp_interval += Config.comm_incoming.tcp_average - nevents; |
663c0a38 | 329 | |
65d448bc AJ |
330 | if (incoming_tcp_interval < 0) |
331 | incoming_tcp_interval = 0; | |
663c0a38 | 332 | |
65d448bc AJ |
333 | if (incoming_tcp_interval > MAX_INCOMING_INTERVAL) |
334 | incoming_tcp_interval = MAX_INCOMING_INTERVAL; | |
663c0a38 | 335 | |
65d448bc AJ |
336 | if (nevents > INCOMING_TCP_MAX) |
337 | nevents = INCOMING_TCP_MAX; | |
663c0a38 | 338 | |
65d448bc | 339 | statCounter.comm_tcp_incoming.count(nevents); |
663c0a38 | 340 | } |
341 | ||
342 | #define DEBUG_FDBITS 0 | |
343 | /* Select on all sockets; call handlers for those that are ready. */ | |
c8407295 | 344 | Comm::Flag |
d841c88d | 345 | Comm::DoSelect(int msec) |
663c0a38 | 346 | { |
347 | fd_set readfds; | |
348 | fd_set pendingfds; | |
349 | fd_set writefds; | |
663c0a38 | 350 | |
351 | PF *hdl = NULL; | |
352 | int fd; | |
353 | int maxfd; | |
354 | int num; | |
355 | int pending; | |
65d448bc | 356 | int calldns = 0, callicp = 0, callhttp = 0; |
663c0a38 | 357 | int j; |
358 | #if DEBUG_FDBITS | |
359 | ||
360 | int i; | |
361 | #endif | |
663c0a38 | 362 | struct timeval poll_time; |
363 | double timeout = current_dtime + (msec / 1000.0); | |
364 | fde *F; | |
365 | ||
366 | int no_bits; | |
367 | fd_set errfds; | |
368 | FD_ZERO(&errfds); | |
369 | ||
370 | do { | |
371 | double start; | |
372 | getCurrentTime(); | |
373 | start = current_dtime; | |
663c0a38 | 374 | |
65d448bc AJ |
375 | if (commCheckUdpIncoming) |
376 | comm_select_udp_incoming(); | |
663c0a38 | 377 | |
65d448bc | 378 | if (commCheckDnsIncoming) |
663c0a38 | 379 | comm_select_dns_incoming(); |
380 | ||
65d448bc AJ |
381 | if (commCheckTcpIncoming) |
382 | comm_select_tcp_incoming(); | |
663c0a38 | 383 | |
65d448bc | 384 | calludp = calldns = calltcp = 0; |
663c0a38 | 385 | |
386 | maxfd = Biggest_FD + 1; | |
387 | ||
41d00cd3 | 388 | memcpy(&readfds, &global_readfds, sizeof(global_readfds)); |
663c0a38 | 389 | |
41d00cd3 | 390 | memcpy(&writefds, &global_writefds, sizeof(global_writefds)); |
663c0a38 | 391 | |
41d00cd3 | 392 | memcpy(&errfds, &global_writefds, sizeof(global_writefds)); |
663c0a38 | 393 | |
394 | /* remove stalled FDs, and deal with pending descriptors */ | |
395 | pending = 0; | |
396 | ||
397 | FD_ZERO(&pendingfds); | |
398 | ||
a2f5277a | 399 | for (j = 0; j < (int) readfds.fd_count; ++j) { |
663c0a38 | 400 | register int readfds_handle = readfds.fd_array[j]; |
401 | no_bits = 1; | |
402 | ||
f412b2d6 | 403 | for ( fd = Biggest_FD; fd; --fd ) { |
663c0a38 | 404 | if ( fd_table[fd].win32.handle == readfds_handle ) { |
405 | if (fd_table[fd].flags.open) { | |
406 | no_bits = 0; | |
407 | break; | |
408 | } | |
409 | } | |
410 | } | |
411 | ||
412 | if (no_bits) | |
413 | continue; | |
414 | ||
08fb215c | 415 | if (FD_ISSET(fd, &readfds) && fd_table[fd].flags.read_pending) { |
663c0a38 | 416 | FD_SET(fd, &pendingfds); |
a2f5277a | 417 | ++pending; |
663c0a38 | 418 | } |
419 | } | |
420 | ||
421 | #if DEBUG_FDBITS | |
a2f5277a | 422 | for (i = 0; i < maxfd; ++i) { |
663c0a38 | 423 | /* Check each open socket for a handler. */ |
424 | ||
425 | if (fd_table[i].read_handler) { | |
08fb215c | 426 | assert(FD_ISSET(i, readfds)); |
663c0a38 | 427 | } |
428 | ||
429 | if (fd_table[i].write_handler) { | |
08fb215c | 430 | assert(FD_ISSET(i, writefds)); |
663c0a38 | 431 | } |
432 | } | |
433 | ||
434 | #endif | |
435 | if (nreadfds + nwritefds == 0) { | |
436 | assert(shutting_down); | |
23ff0bee | 437 | return Comm::SHUTDOWN; |
663c0a38 | 438 | } |
439 | ||
440 | if (msec > MAX_POLL_TIME) | |
441 | msec = MAX_POLL_TIME; | |
442 | ||
663c0a38 | 443 | if (pending) |
444 | msec = 0; | |
445 | ||
446 | for (;;) { | |
447 | poll_time.tv_sec = msec / 1000; | |
448 | poll_time.tv_usec = (msec % 1000) * 1000; | |
0a515876 | 449 | ++statCounter.syscalls.selects; |
663c0a38 | 450 | num = select(maxfd, &readfds, &writefds, &errfds, &poll_time); |
0a515876 | 451 | ++statCounter.select_loops; |
663c0a38 | 452 | |
453 | if (num >= 0 || pending > 0) | |
454 | break; | |
455 | ||
456 | if (ignoreErrno(errno)) | |
457 | break; | |
458 | ||
fa84c01d | 459 | debugs(5, DBG_CRITICAL, "comm_select: select failure: " << xstrerror()); |
663c0a38 | 460 | |
461 | examine_select(&readfds, &writefds); | |
462 | ||
4ee57cbe | 463 | return Comm::COMM_ERROR; |
663c0a38 | 464 | |
465 | /* NOTREACHED */ | |
466 | } | |
467 | ||
468 | if (num < 0 && !pending) | |
469 | continue; | |
470 | ||
471 | getCurrentTime(); | |
472 | ||
1b826af5 | 473 | debugs(5, num ? 5 : 8, "comm_select: " << num << "+" << pending << " FDs ready"); |
663c0a38 | 474 | |
f30f7998 | 475 | statCounter.select_fds_hist.count(num); |
663c0a38 | 476 | |
663c0a38 | 477 | if (num == 0 && pending == 0) |
478 | continue; | |
479 | ||
480 | /* Scan return fd masks for ready descriptors */ | |
663c0a38 | 481 | assert(readfds.fd_count <= (unsigned int) Biggest_FD); |
663c0a38 | 482 | assert(pendingfds.fd_count <= (unsigned int) Biggest_FD); |
483 | ||
a2f5277a | 484 | for (j = 0; j < (int) readfds.fd_count; ++j) { |
663c0a38 | 485 | register int readfds_handle = readfds.fd_array[j]; |
486 | register int pendingfds_handle = pendingfds.fd_array[j]; | |
487 | register int osfhandle; | |
488 | no_bits = 1; | |
489 | ||
f412b2d6 | 490 | for ( fd = Biggest_FD; fd; --fd ) { |
663c0a38 | 491 | osfhandle = fd_table[fd].win32.handle; |
492 | ||
493 | if (( osfhandle == readfds_handle ) || | |
494 | ( osfhandle == pendingfds_handle )) { | |
495 | if (fd_table[fd].flags.open) { | |
496 | no_bits = 0; | |
497 | break; | |
498 | } | |
499 | } | |
500 | } | |
501 | ||
502 | if (no_bits) | |
503 | continue; | |
504 | ||
505 | #if DEBUG_FDBITS | |
506 | ||
bf8fe701 | 507 | debugs(5, 9, "FD " << fd << " bit set for reading"); |
663c0a38 | 508 | |
08fb215c | 509 | assert(FD_ISSET(fd, readfds)); |
663c0a38 | 510 | |
511 | #endif | |
512 | ||
65d448bc AJ |
513 | if (fdIsUdpListener(fd)) { |
514 | calludp = 1; | |
663c0a38 | 515 | continue; |
516 | } | |
517 | ||
518 | if (fdIsDns(fd)) { | |
519 | calldns = 1; | |
520 | continue; | |
521 | } | |
522 | ||
65d448bc AJ |
523 | if (fdIsTcpListener(fd)) { |
524 | calltcp = 1; | |
663c0a38 | 525 | continue; |
526 | } | |
527 | ||
528 | F = &fd_table[fd]; | |
bf8fe701 | 529 | debugs(5, 6, "comm_select: FD " << fd << " ready for reading"); |
663c0a38 | 530 | |
65d448bc | 531 | if ((hdl = F->read_handler)) { |
663c0a38 | 532 | F->read_handler = NULL; |
1b826af5 | 533 | F->flags.read_pending = 0; |
663c0a38 | 534 | commUpdateReadBits(fd, NULL); |
535 | hdl(fd, F->read_data); | |
a2f5277a | 536 | ++ statCounter.select_fds; |
663c0a38 | 537 | |
65d448bc AJ |
538 | if (commCheckUdpIncoming) |
539 | comm_select_udp_incoming(); | |
663c0a38 | 540 | |
65d448bc | 541 | if (commCheckDnsIncoming) |
663c0a38 | 542 | comm_select_dns_incoming(); |
543 | ||
65d448bc AJ |
544 | if (commCheckTcpIncoming) |
545 | comm_select_tcp_incoming(); | |
663c0a38 | 546 | } |
547 | } | |
548 | ||
549 | assert(errfds.fd_count <= (unsigned int) Biggest_FD); | |
550 | ||
a2f5277a | 551 | for (j = 0; j < (int) errfds.fd_count; ++j) { |
663c0a38 | 552 | register int errfds_handle = errfds.fd_array[j]; |
553 | ||
f412b2d6 | 554 | for ( fd = Biggest_FD; fd; --fd ) { |
663c0a38 | 555 | if ( fd_table[fd].win32.handle == errfds_handle ) |
556 | break; | |
557 | } | |
558 | ||
559 | if (fd_table[fd].flags.open) { | |
560 | F = &fd_table[fd]; | |
561 | ||
562 | if ((hdl = F->write_handler)) { | |
563 | F->write_handler = NULL; | |
564 | commUpdateWriteBits(fd, NULL); | |
565 | hdl(fd, F->write_data); | |
a2f5277a | 566 | ++ statCounter.select_fds; |
663c0a38 | 567 | } |
568 | } | |
569 | } | |
570 | ||
571 | assert(writefds.fd_count <= (unsigned int) Biggest_FD); | |
572 | ||
a2f5277a | 573 | for (j = 0; j < (int) writefds.fd_count; ++j) { |
663c0a38 | 574 | register int writefds_handle = writefds.fd_array[j]; |
575 | no_bits = 1; | |
576 | ||
f412b2d6 | 577 | for ( fd = Biggest_FD; fd; --fd ) { |
663c0a38 | 578 | if ( fd_table[fd].win32.handle == writefds_handle ) { |
579 | if (fd_table[fd].flags.open) { | |
580 | no_bits = 0; | |
581 | break; | |
582 | } | |
583 | } | |
584 | } | |
585 | ||
586 | if (no_bits) | |
587 | continue; | |
588 | ||
589 | #if DEBUG_FDBITS | |
590 | ||
bf8fe701 | 591 | debugs(5, 9, "FD " << fd << " bit set for writing"); |
663c0a38 | 592 | |
08fb215c | 593 | assert(FD_ISSET(fd, writefds)); |
663c0a38 | 594 | |
595 | #endif | |
596 | ||
65d448bc AJ |
597 | if (fdIsUdpListener(fd)) { |
598 | calludp = 1; | |
663c0a38 | 599 | continue; |
600 | } | |
601 | ||
602 | if (fdIsDns(fd)) { | |
603 | calldns = 1; | |
604 | continue; | |
605 | } | |
606 | ||
65d448bc AJ |
607 | if (fdIsTcpListener(fd)) { |
608 | calltcp = 1; | |
663c0a38 | 609 | continue; |
610 | } | |
611 | ||
612 | F = &fd_table[fd]; | |
48e7baac | 613 | debugs(5, 6, "comm_select: FD " << fd << " ready for writing"); |
663c0a38 | 614 | |
615 | if ((hdl = F->write_handler)) { | |
616 | F->write_handler = NULL; | |
617 | commUpdateWriteBits(fd, NULL); | |
618 | hdl(fd, F->write_data); | |
a2f5277a | 619 | ++ statCounter.select_fds; |
663c0a38 | 620 | |
65d448bc AJ |
621 | if (commCheckUdpIncoming) |
622 | comm_select_udp_incoming(); | |
663c0a38 | 623 | |
65d448bc | 624 | if (commCheckDnsIncoming) |
663c0a38 | 625 | comm_select_dns_incoming(); |
626 | ||
65d448bc AJ |
627 | if (commCheckTcpIncoming) |
628 | comm_select_tcp_incoming(); | |
663c0a38 | 629 | } |
630 | } | |
631 | ||
65d448bc AJ |
632 | if (calludp) |
633 | comm_select_udp_incoming(); | |
663c0a38 | 634 | |
635 | if (calldns) | |
636 | comm_select_dns_incoming(); | |
637 | ||
65d448bc AJ |
638 | if (calltcp) |
639 | comm_select_tcp_incoming(); | |
663c0a38 | 640 | |
663c0a38 | 641 | getCurrentTime(); |
642 | ||
643 | statCounter.select_time += (current_dtime - start); | |
644 | ||
c8407295 | 645 | return Comm::OK; |
3d0ac046 | 646 | } while (timeout > current_dtime); |
4a7a3d56 | 647 | debugs(5, 8, "comm_select: time out: " << squid_curtime); |
663c0a38 | 648 | |
c8407295 | 649 | return Comm::TIMEOUT; |
663c0a38 | 650 | } |
651 | ||
652 | static void | |
653 | comm_select_dns_incoming(void) | |
654 | { | |
655 | int nfds = 0; | |
4d6c8504 | 656 | int fds[3]; |
663c0a38 | 657 | int nevents; |
658 | dns_io_events = 0; | |
659 | ||
055421ee | 660 | if (DnsSocketA < 0 && DnsSocketB < 0) |
663c0a38 | 661 | return; |
662 | ||
f207fe64 FC |
663 | if (DnsSocketA >= 0) { |
664 | fds[nfds] = DnsSocketA; | |
665 | ++nfds; | |
666 | } | |
4d6c8504 | 667 | |
f207fe64 FC |
668 | if (DnsSocketB >= 0) { |
669 | fds[nfds] = DnsSocketB; | |
670 | ++nfds; | |
671 | } | |
663c0a38 | 672 | |
673 | nevents = comm_check_incoming_select_handlers(nfds, fds); | |
674 | ||
675 | if (nevents < 0) | |
676 | return; | |
677 | ||
65d448bc | 678 | incoming_dns_interval += Config.comm_incoming.dns.average - nevents; |
663c0a38 | 679 | |
65d448bc AJ |
680 | if (incoming_dns_interval < Config.comm_incoming.dns.min_poll) |
681 | incoming_dns_interval = Config.comm_incoming.dns.min_poll; | |
663c0a38 | 682 | |
683 | if (incoming_dns_interval > MAX_INCOMING_INTERVAL) | |
684 | incoming_dns_interval = MAX_INCOMING_INTERVAL; | |
685 | ||
686 | if (nevents > INCOMING_DNS_MAX) | |
687 | nevents = INCOMING_DNS_MAX; | |
688 | ||
f30f7998 | 689 | statCounter.comm_dns_incoming.count(nevents); |
663c0a38 | 690 | } |
691 | ||
692 | void | |
d841c88d | 693 | Comm::SelectLoopInit(void) |
663c0a38 | 694 | { |
695 | zero_tv.tv_sec = 0; | |
696 | zero_tv.tv_usec = 0; | |
697 | FD_ZERO(&global_readfds); | |
698 | FD_ZERO(&global_writefds); | |
699 | nreadfds = nwritefds = 0; | |
da9b2c49 | 700 | |
d841c88d AJ |
701 | Mgr::RegisterAction("comm_select_incoming", |
702 | "comm_incoming() stats", | |
703 | commIncomingStats, 0, 1); | |
663c0a38 | 704 | } |
705 | ||
663c0a38 | 706 | /* |
707 | * examine_select - debug routine. | |
708 | * | |
709 | * I spend the day chasing this core dump that occurs when both the client | |
710 | * and the server side of a cache fetch simultaneoulsy abort the | |
711 | * connection. While I haven't really studied the code to figure out how | |
712 | * it happens, the snippet below may prevent the cache from exitting: | |
26ac0430 | 713 | * |
663c0a38 | 714 | * Call this from where the select loop fails. |
715 | */ | |
716 | static int | |
717 | examine_select(fd_set * readfds, fd_set * writefds) | |
718 | { | |
719 | int fd = 0; | |
720 | fd_set read_x; | |
721 | fd_set write_x; | |
722 | ||
723 | struct timeval tv; | |
6d527e0a | 724 | AsyncCall::Pointer ch = NULL; |
663c0a38 | 725 | fde *F = NULL; |
726 | ||
727 | struct stat sb; | |
fa84c01d | 728 | debugs(5, DBG_CRITICAL, "examine_select: Examining open file descriptors..."); |
663c0a38 | 729 | |
a2f5277a | 730 | for (fd = 0; fd < Squid_MaxFD; ++fd) { |
663c0a38 | 731 | FD_ZERO(&read_x); |
732 | FD_ZERO(&write_x); | |
733 | tv.tv_sec = tv.tv_usec = 0; | |
734 | ||
08fb215c | 735 | if (FD_ISSET(fd, readfds)) |
663c0a38 | 736 | FD_SET(fd, &read_x); |
08fb215c | 737 | else if (FD_ISSET(fd, writefds)) |
663c0a38 | 738 | FD_SET(fd, &write_x); |
739 | else | |
740 | continue; | |
741 | ||
a2f5277a | 742 | ++ statCounter.syscalls.selects; |
663c0a38 | 743 | errno = 0; |
744 | ||
745 | if (!fstat(fd, &sb)) { | |
bf8fe701 | 746 | debugs(5, 5, "FD " << fd << " is valid."); |
663c0a38 | 747 | continue; |
748 | } | |
749 | ||
750 | F = &fd_table[fd]; | |
fa84c01d FC |
751 | debugs(5, DBG_CRITICAL, "FD " << fd << ": " << xstrerror()); |
752 | debugs(5, DBG_CRITICAL, "WARNING: FD " << fd << " has handlers, but it's invalid."); | |
753 | debugs(5, DBG_CRITICAL, "FD " << fd << " is a " << fdTypeStr[F->type] << " called '" << F->desc << "'"); | |
754 | debugs(5, DBG_CRITICAL, "tmout:" << F->timeoutHandler << " read:" << F->read_handler << " write:" << F->write_handler); | |
663c0a38 | 755 | |
1b826af5 | 756 | for (ch = F->closeHandler; ch != NULL; ch = ch->Next()) |
fa84c01d | 757 | debugs(5, DBG_CRITICAL, " close handler: " << ch); |
663c0a38 | 758 | |
6d527e0a | 759 | if (F->closeHandler != NULL) { |
663c0a38 | 760 | commCallCloseHandlers(fd); |
6d527e0a | 761 | } else if (F->timeoutHandler != NULL) { |
fa84c01d | 762 | debugs(5, DBG_CRITICAL, "examine_select: Calling Timeout Handler"); |
26ac0430 | 763 | ScheduleCallHere(F->timeoutHandler); |
663c0a38 | 764 | } |
765 | ||
766 | F->closeHandler = NULL; | |
6d527e0a | 767 | F->timeoutHandler = NULL; |
663c0a38 | 768 | F->read_handler = NULL; |
769 | F->write_handler = NULL; | |
770 | FD_CLR(fd, readfds); | |
771 | FD_CLR(fd, writefds); | |
772 | } | |
773 | ||
774 | return 0; | |
775 | } | |
776 | ||
663c0a38 | 777 | static void |
778 | commIncomingStats(StoreEntry * sentry) | |
779 | { | |
65d448bc AJ |
780 | storeAppendPrintf(sentry, "Current incoming_udp_interval: %d\n", |
781 | incoming_udp_interval >> INCOMING_FACTOR); | |
663c0a38 | 782 | storeAppendPrintf(sentry, "Current incoming_dns_interval: %d\n", |
783 | incoming_dns_interval >> INCOMING_FACTOR); | |
65d448bc AJ |
784 | storeAppendPrintf(sentry, "Current incoming_tcp_interval: %d\n", |
785 | incoming_tcp_interval >> INCOMING_FACTOR); | |
663c0a38 | 786 | storeAppendPrintf(sentry, "\n"); |
787 | storeAppendPrintf(sentry, "Histogram of events per incoming socket type\n"); | |
65d448bc AJ |
788 | storeAppendPrintf(sentry, "ICP Messages handled per comm_select_udp_incoming() call:\n"); |
789 | statCounter.comm_udp_incoming.dump(sentry, statHistIntDumper); | |
663c0a38 | 790 | storeAppendPrintf(sentry, "DNS Messages handled per comm_select_dns_incoming() call:\n"); |
82146cc8 | 791 | statCounter.comm_dns_incoming.dump(sentry, statHistIntDumper); |
65d448bc AJ |
792 | storeAppendPrintf(sentry, "HTTP Messages handled per comm_select_tcp_incoming() call:\n"); |
793 | statCounter.comm_tcp_incoming.dump(sentry, statHistIntDumper); | |
663c0a38 | 794 | } |
795 | ||
796 | void | |
797 | commUpdateReadBits(int fd, PF * handler) | |
798 | { | |
08fb215c | 799 | if (handler && !FD_ISSET(fd, &global_readfds)) { |
663c0a38 | 800 | FD_SET(fd, &global_readfds); |
a2f5277a | 801 | ++nreadfds; |
08fb215c | 802 | } else if (!handler && FD_ISSET(fd, &global_readfds)) { |
663c0a38 | 803 | FD_CLR(fd, &global_readfds); |
a2f5277a | 804 | --nreadfds; |
663c0a38 | 805 | } |
806 | } | |
807 | ||
808 | void | |
809 | commUpdateWriteBits(int fd, PF * handler) | |
810 | { | |
08fb215c | 811 | if (handler && !FD_ISSET(fd, &global_writefds)) { |
663c0a38 | 812 | FD_SET(fd, &global_writefds); |
a2f5277a | 813 | ++nwritefds; |
08fb215c | 814 | } else if (!handler && FD_ISSET(fd, &global_writefds)) { |
663c0a38 | 815 | FD_CLR(fd, &global_writefds); |
a2f5277a | 816 | --nwritefds; |
663c0a38 | 817 | } |
818 | } | |
819 | ||
820 | /* Called by async-io or diskd to speed up the polling */ | |
821 | void | |
d841c88d | 822 | Comm::QuickPollRequired(void) |
663c0a38 | 823 | { |
824 | MAX_POLL_TIME = 10; | |
825 | } | |
826 | ||
827 | #endif /* USE_SELECT_WIN32 */ |