]>
Commit | Line | Data |
---|---|---|
663c0a38 | 1 | /* |
bde978a6 | 2 | * Copyright (C) 1996-2015 The Squid Software Foundation and contributors |
663c0a38 | 3 | * |
bbc27441 AJ |
4 | * Squid software is distributed under GPLv2+ license and includes |
5 | * contributions from numerous individuals and organizations. | |
6 | * Please see the COPYING and CONTRIBUTORS files for details. | |
663c0a38 | 7 | */ |
bbc27441 AJ |
8 | |
9 | /* DEBUG: section 05 Socket Functions */ | |
10 | ||
f7f3304a | 11 | #include "squid.h" |
d841c88d AJ |
12 | |
13 | #if USE_SELECT_WIN32 | |
65d448bc | 14 | #include "anyp/PortCfg.h" |
f8171fc7 | 15 | #include "comm/Connection.h" |
d841c88d AJ |
16 | #include "comm/Loops.h" |
17 | #include "fde.h" | |
f8171fc7 | 18 | #include "ICP.h" |
8822ebee | 19 | #include "mgr/Registration.h" |
663c0a38 | 20 | #include "SquidTime.h" |
e1656dc4 | 21 | #include "StatCounters.h" |
00a7574e | 22 | #include "StatHist.h" |
663c0a38 | 23 | #include "Store.h" |
663c0a38 | 24 | |
1a30fdf5 | 25 | #include <cerrno> |
21d845b1 | 26 | |
f53969cc | 27 | static int MAX_POLL_TIME = 1000; /* see also Comm::QuickPollRequired() */ |
663c0a38 | 28 | |
29 | #ifndef howmany | |
30 | #define howmany(x, y) (((x)+((y)-1))/(y)) | |
31 | #endif | |
32 | #ifndef NBBY | |
33 | #define NBBY 8 | |
34 | #endif | |
35 | #define FD_MASK_BYTES sizeof(fd_mask) | |
36 | #define FD_MASK_BITS (FD_MASK_BYTES*NBBY) | |
37 | ||
38 | /* STATIC */ | |
39 | static int examine_select(fd_set *, fd_set *); | |
65d448bc AJ |
40 | static int fdIsTcpListener(int fd); |
41 | static int fdIsUdpListener(int fd); | |
663c0a38 | 42 | static int fdIsDns(int fd); |
43 | static OBJH commIncomingStats; | |
44 | static int comm_check_incoming_select_handlers(int nfds, int *fds); | |
45 | static void comm_select_dns_incoming(void); | |
46 | static void commUpdateReadBits(int fd, PF * handler); | |
47 | static void commUpdateWriteBits(int fd, PF * handler); | |
48 | ||
663c0a38 | 49 | static struct timeval zero_tv; |
50 | static fd_set global_readfds; | |
51 | static fd_set global_writefds; | |
52 | static int nreadfds; | |
53 | static int nwritefds; | |
54 | ||
55 | /* | |
56 | * Automatic tuning for incoming requests: | |
57 | * | |
58 | * INCOMING sockets are the ICP and HTTP ports. We need to check these | |
59 | * fairly regularly, but how often? When the load increases, we | |
60 | * want to check the incoming sockets more often. If we have a lot | |
61 | * of incoming ICP, then we need to check these sockets more than | |
62 | * if we just have HTTP. | |
63 | * | |
65d448bc | 64 | * The variables 'incoming_udp_interval' and 'incoming_tcp_interval' |
663c0a38 | 65 | * determine how many normal I/O events to process before checking |
66 | * incoming sockets again. Note we store the incoming_interval | |
67 | * multipled by a factor of (2^INCOMING_FACTOR) to have some | |
68 | * pseudo-floating point precision. | |
69 | * | |
65d448bc | 70 | * The variable 'udp_io_events' and 'tcp_io_events' counts how many normal |
663c0a38 | 71 | * I/O events have been processed since the last check on the incoming |
72 | * sockets. When io_events > incoming_interval, its time to check incoming | |
73 | * sockets. | |
74 | * | |
75 | * Every time we check incoming sockets, we count how many new messages | |
76 | * or connections were processed. This is used to adjust the | |
77 | * incoming_interval for the next iteration. The new incoming_interval | |
78 | * is calculated as the current incoming_interval plus what we would | |
79 | * like to see as an average number of events minus the number of | |
80 | * events just processed. | |
81 | * | |
82 | * incoming_interval = incoming_interval + target_average - number_of_events_processed | |
83 | * | |
65d448bc | 84 | * There are separate incoming_interval counters for DNS, UDP and TCP events |
26ac0430 | 85 | * |
663c0a38 | 86 | * You can see the current values of the incoming_interval's, as well as |
87 | * a histogram of 'incoming_events' by asking the cache manager | |
88 | * for 'comm_incoming', e.g.: | |
89 | * | |
90 | * % ./client mgr:comm_incoming | |
91 | * | |
92 | * Caveats: | |
93 | * | |
94 | * - We have MAX_INCOMING_INTEGER as a magic upper limit on | |
95 | * incoming_interval for both types of sockets. At the | |
96 | * largest value the cache will effectively be idling. | |
97 | * | |
98 | * - The higher the INCOMING_FACTOR, the slower the algorithm will | |
99 | * respond to load spikes/increases/decreases in demand. A value | |
100 | * between 3 and 8 is recommended. | |
101 | */ | |
102 | ||
103 | #define MAX_INCOMING_INTEGER 256 | |
104 | #define INCOMING_FACTOR 5 | |
105 | #define MAX_INCOMING_INTERVAL (MAX_INCOMING_INTEGER << INCOMING_FACTOR) | |
65d448bc | 106 | static int udp_io_events = 0; |
663c0a38 | 107 | static int dns_io_events = 0; |
65d448bc AJ |
108 | static int tcp_io_events = 0; |
109 | static int incoming_udp_interval = 16 << INCOMING_FACTOR; | |
663c0a38 | 110 | static int incoming_dns_interval = 16 << INCOMING_FACTOR; |
65d448bc AJ |
111 | static int incoming_tcp_interval = 16 << INCOMING_FACTOR; |
112 | #define commCheckUdpIncoming (++udp_io_events > (incoming_udp_interval>> INCOMING_FACTOR)) | |
113 | #define commCheckDnsIncoming (++dns_io_events > (incoming_dns_interval>> INCOMING_FACTOR)) | |
114 | #define commCheckTcpIncoming (++tcp_io_events > (incoming_tcp_interval>> INCOMING_FACTOR)) | |
663c0a38 | 115 | |
116 | void | |
d841c88d | 117 | Comm::SetSelect(int fd, unsigned int type, PF * handler, void *client_data, time_t timeout) |
663c0a38 | 118 | { |
119 | fde *F = &fd_table[fd]; | |
120 | assert(fd >= 0); | |
121 | assert(F->flags.open); | |
48e7baac AJ |
122 | debugs(5, 5, HERE << "FD " << fd << ", type=" << type << |
123 | ", handler=" << handler << ", client_data=" << client_data << | |
124 | ", timeout=" << timeout); | |
663c0a38 | 125 | |
126 | if (type & COMM_SELECT_READ) { | |
127 | F->read_handler = handler; | |
128 | F->read_data = client_data; | |
129 | commUpdateReadBits(fd, handler); | |
130 | } | |
131 | ||
132 | if (type & COMM_SELECT_WRITE) { | |
133 | F->write_handler = handler; | |
134 | F->write_data = client_data; | |
135 | commUpdateWriteBits(fd, handler); | |
136 | } | |
137 | ||
138 | if (timeout) | |
139 | F->timeout = squid_curtime + timeout; | |
140 | } | |
141 | ||
3a5a4930 | 142 | void |
d841c88d | 143 | Comm::ResetSelect(int fd) |
3a5a4930 | 144 | { |
145 | } | |
146 | ||
663c0a38 | 147 | static int |
65d448bc | 148 | fdIsUdpListener(int fd) |
663c0a38 | 149 | { |
f8171fc7 | 150 | if (icpIncomingConn != NULL && fd == icpIncomingConn->fd) |
663c0a38 | 151 | return 1; |
152 | ||
f8171fc7 | 153 | if (icpOutgoingConn != NULL && fd == icpOutgoingConn->fd) |
663c0a38 | 154 | return 1; |
155 | ||
156 | return 0; | |
157 | } | |
158 | ||
159 | static int | |
160 | fdIsDns(int fd) | |
161 | { | |
4d6c8504 AJ |
162 | if (fd == DnsSocketA) |
163 | return 1; | |
164 | ||
165 | if (fd == DnsSocketB) | |
663c0a38 | 166 | return 1; |
167 | ||
168 | return 0; | |
169 | } | |
170 | ||
171 | static int | |
65d448bc | 172 | fdIsTcpListener(int fd) |
663c0a38 | 173 | { |
d00790b2 | 174 | for (AnyP::PortCfgPointer s = HttpPortList; s != NULL; s = s->next) { |
65d448bc | 175 | if (s->listenConn != NULL && s->listenConn->fd == fd) |
663c0a38 | 176 | return 1; |
177 | } | |
178 | ||
179 | return 0; | |
180 | } | |
181 | ||
663c0a38 | 182 | static int |
183 | comm_check_incoming_select_handlers(int nfds, int *fds) | |
184 | { | |
185 | int i; | |
186 | int fd; | |
187 | int maxfd = 0; | |
188 | PF *hdl = NULL; | |
189 | fd_set read_mask; | |
190 | fd_set write_mask; | |
663c0a38 | 191 | FD_ZERO(&read_mask); |
192 | FD_ZERO(&write_mask); | |
193 | incoming_sockets_accepted = 0; | |
194 | ||
a2f5277a | 195 | for (i = 0; i < nfds; ++i) { |
663c0a38 | 196 | fd = fds[i]; |
197 | ||
198 | if (fd_table[fd].read_handler) { | |
199 | FD_SET(fd, &read_mask); | |
200 | ||
201 | if (fd > maxfd) | |
202 | maxfd = fd; | |
203 | } | |
204 | ||
205 | if (fd_table[fd].write_handler) { | |
206 | FD_SET(fd, &write_mask); | |
207 | ||
208 | if (fd > maxfd) | |
209 | maxfd = fd; | |
210 | } | |
211 | } | |
212 | ||
213 | if (maxfd++ == 0) | |
214 | return -1; | |
215 | ||
216 | getCurrentTime(); | |
217 | ||
a2f5277a | 218 | ++ statCounter.syscalls.selects; |
663c0a38 | 219 | |
f6d258c8 | 220 | if (select(maxfd, &read_mask, &write_mask, NULL, &zero_tv) < 1) |
663c0a38 | 221 | return incoming_sockets_accepted; |
222 | ||
a2f5277a | 223 | for (i = 0; i < nfds; ++i) { |
663c0a38 | 224 | fd = fds[i]; |
225 | ||
08fb215c | 226 | if (FD_ISSET(fd, &read_mask)) { |
663c0a38 | 227 | if ((hdl = fd_table[fd].read_handler) != NULL) { |
228 | fd_table[fd].read_handler = NULL; | |
229 | commUpdateReadBits(fd, NULL); | |
230 | hdl(fd, fd_table[fd].read_data); | |
231 | } else { | |
e0236918 | 232 | debugs(5, DBG_IMPORTANT, "comm_select_incoming: FD " << fd << " NULL read handler"); |
663c0a38 | 233 | } |
234 | } | |
235 | ||
08fb215c | 236 | if (FD_ISSET(fd, &write_mask)) { |
663c0a38 | 237 | if ((hdl = fd_table[fd].write_handler) != NULL) { |
238 | fd_table[fd].write_handler = NULL; | |
239 | commUpdateWriteBits(fd, NULL); | |
240 | hdl(fd, fd_table[fd].write_data); | |
241 | } else { | |
e0236918 | 242 | debugs(5, DBG_IMPORTANT, "comm_select_incoming: FD " << fd << " NULL write handler"); |
663c0a38 | 243 | } |
244 | } | |
245 | } | |
246 | ||
247 | return incoming_sockets_accepted; | |
248 | } | |
249 | ||
250 | static void | |
65d448bc | 251 | comm_select_udp_incoming(void) |
663c0a38 | 252 | { |
253 | int nfds = 0; | |
254 | int fds[2]; | |
255 | int nevents; | |
65d448bc | 256 | udp_io_events = 0; |
663c0a38 | 257 | |
f207fe64 FC |
258 | if (Comm::IsConnOpen(icpIncomingConn)) { |
259 | fds[nfds] = icpIncomingConn->fd; | |
260 | ++nfds; | |
261 | } | |
663c0a38 | 262 | |
f207fe64 FC |
263 | if (Comm::IsConnOpen(icpOutgoingConn) && icpIncomingConn != icpOutgoingConn) { |
264 | fds[nfds] = icpOutgoingConn->fd; | |
265 | ++nfds; | |
266 | } | |
663c0a38 | 267 | |
268 | if (nfds == 0) | |
269 | return; | |
270 | ||
271 | nevents = comm_check_incoming_select_handlers(nfds, fds); | |
272 | ||
f6d258c8 | 273 | incoming_udp_interval += Config.comm_incoming.udp.average - nevents; |
663c0a38 | 274 | |
65d448bc AJ |
275 | if (incoming_udp_interval < 0) |
276 | incoming_udp_interval = 0; | |
663c0a38 | 277 | |
65d448bc AJ |
278 | if (incoming_udp_interval > MAX_INCOMING_INTERVAL) |
279 | incoming_udp_interval = MAX_INCOMING_INTERVAL; | |
663c0a38 | 280 | |
65d448bc AJ |
281 | if (nevents > INCOMING_UDP_MAX) |
282 | nevents = INCOMING_UDP_MAX; | |
663c0a38 | 283 | |
65d448bc | 284 | statCounter.comm_udp_incoming.count(nevents); |
663c0a38 | 285 | } |
286 | ||
287 | static void | |
65d448bc | 288 | comm_select_tcp_incoming(void) |
663c0a38 | 289 | { |
290 | int nfds = 0; | |
65d448bc | 291 | int fds[MAXTCPLISTENPORTS]; |
663c0a38 | 292 | int nevents; |
65d448bc | 293 | tcp_io_events = 0; |
663c0a38 | 294 | |
65d448bc | 295 | // XXX: only poll sockets that won't be deferred. But how do we identify them? |
663c0a38 | 296 | |
d00790b2 | 297 | for (AnyP::PortCfgPointer s = HttpPortList; s != NULL; s = s->next) { |
f207fe64 FC |
298 | if (Comm::IsConnOpen(s->listenConn)) { |
299 | fds[nfds] = s->listenConn->fd; | |
300 | ++nfds; | |
301 | } | |
663c0a38 | 302 | } |
303 | ||
304 | nevents = comm_check_incoming_select_handlers(nfds, fds); | |
f6d258c8 | 305 | incoming_tcp_interval += Config.comm_incoming.tcp.average - nevents; |
663c0a38 | 306 | |
65d448bc AJ |
307 | if (incoming_tcp_interval < 0) |
308 | incoming_tcp_interval = 0; | |
663c0a38 | 309 | |
65d448bc AJ |
310 | if (incoming_tcp_interval > MAX_INCOMING_INTERVAL) |
311 | incoming_tcp_interval = MAX_INCOMING_INTERVAL; | |
663c0a38 | 312 | |
65d448bc AJ |
313 | if (nevents > INCOMING_TCP_MAX) |
314 | nevents = INCOMING_TCP_MAX; | |
663c0a38 | 315 | |
65d448bc | 316 | statCounter.comm_tcp_incoming.count(nevents); |
663c0a38 | 317 | } |
318 | ||
319 | #define DEBUG_FDBITS 0 | |
320 | /* Select on all sockets; call handlers for those that are ready. */ | |
c8407295 | 321 | Comm::Flag |
d841c88d | 322 | Comm::DoSelect(int msec) |
663c0a38 | 323 | { |
324 | fd_set readfds; | |
325 | fd_set pendingfds; | |
326 | fd_set writefds; | |
663c0a38 | 327 | |
328 | PF *hdl = NULL; | |
329 | int fd; | |
330 | int maxfd; | |
331 | int num; | |
332 | int pending; | |
f6d258c8 | 333 | int calldns = 0, calludp = 0, calltcp = 0; |
663c0a38 | 334 | int j; |
335 | #if DEBUG_FDBITS | |
336 | ||
337 | int i; | |
338 | #endif | |
663c0a38 | 339 | struct timeval poll_time; |
340 | double timeout = current_dtime + (msec / 1000.0); | |
341 | fde *F; | |
342 | ||
343 | int no_bits; | |
344 | fd_set errfds; | |
345 | FD_ZERO(&errfds); | |
346 | ||
347 | do { | |
348 | double start; | |
349 | getCurrentTime(); | |
350 | start = current_dtime; | |
663c0a38 | 351 | |
65d448bc AJ |
352 | if (commCheckUdpIncoming) |
353 | comm_select_udp_incoming(); | |
663c0a38 | 354 | |
65d448bc | 355 | if (commCheckDnsIncoming) |
663c0a38 | 356 | comm_select_dns_incoming(); |
357 | ||
65d448bc AJ |
358 | if (commCheckTcpIncoming) |
359 | comm_select_tcp_incoming(); | |
663c0a38 | 360 | |
f6d258c8 | 361 | calldns = calludp = calltcp = 0; |
663c0a38 | 362 | |
363 | maxfd = Biggest_FD + 1; | |
364 | ||
41d00cd3 | 365 | memcpy(&readfds, &global_readfds, sizeof(global_readfds)); |
663c0a38 | 366 | |
41d00cd3 | 367 | memcpy(&writefds, &global_writefds, sizeof(global_writefds)); |
663c0a38 | 368 | |
41d00cd3 | 369 | memcpy(&errfds, &global_writefds, sizeof(global_writefds)); |
663c0a38 | 370 | |
371 | /* remove stalled FDs, and deal with pending descriptors */ | |
372 | pending = 0; | |
373 | ||
374 | FD_ZERO(&pendingfds); | |
375 | ||
a2f5277a | 376 | for (j = 0; j < (int) readfds.fd_count; ++j) { |
663c0a38 | 377 | register int readfds_handle = readfds.fd_array[j]; |
378 | no_bits = 1; | |
379 | ||
f412b2d6 | 380 | for ( fd = Biggest_FD; fd; --fd ) { |
663c0a38 | 381 | if ( fd_table[fd].win32.handle == readfds_handle ) { |
382 | if (fd_table[fd].flags.open) { | |
383 | no_bits = 0; | |
384 | break; | |
385 | } | |
386 | } | |
387 | } | |
388 | ||
389 | if (no_bits) | |
390 | continue; | |
391 | ||
08fb215c | 392 | if (FD_ISSET(fd, &readfds) && fd_table[fd].flags.read_pending) { |
663c0a38 | 393 | FD_SET(fd, &pendingfds); |
a2f5277a | 394 | ++pending; |
663c0a38 | 395 | } |
396 | } | |
397 | ||
398 | #if DEBUG_FDBITS | |
a2f5277a | 399 | for (i = 0; i < maxfd; ++i) { |
663c0a38 | 400 | /* Check each open socket for a handler. */ |
401 | ||
402 | if (fd_table[i].read_handler) { | |
08fb215c | 403 | assert(FD_ISSET(i, readfds)); |
663c0a38 | 404 | } |
405 | ||
406 | if (fd_table[i].write_handler) { | |
08fb215c | 407 | assert(FD_ISSET(i, writefds)); |
663c0a38 | 408 | } |
409 | } | |
410 | ||
411 | #endif | |
412 | if (nreadfds + nwritefds == 0) { | |
413 | assert(shutting_down); | |
23ff0bee | 414 | return Comm::SHUTDOWN; |
663c0a38 | 415 | } |
416 | ||
417 | if (msec > MAX_POLL_TIME) | |
418 | msec = MAX_POLL_TIME; | |
419 | ||
663c0a38 | 420 | if (pending) |
421 | msec = 0; | |
422 | ||
423 | for (;;) { | |
424 | poll_time.tv_sec = msec / 1000; | |
425 | poll_time.tv_usec = (msec % 1000) * 1000; | |
f6d258c8 | 426 | ++ statCounter.syscalls.selects; |
663c0a38 | 427 | num = select(maxfd, &readfds, &writefds, &errfds, &poll_time); |
f6d258c8 | 428 | ++ statCounter.select_loops; |
663c0a38 | 429 | |
430 | if (num >= 0 || pending > 0) | |
431 | break; | |
432 | ||
433 | if (ignoreErrno(errno)) | |
434 | break; | |
435 | ||
fa84c01d | 436 | debugs(5, DBG_CRITICAL, "comm_select: select failure: " << xstrerror()); |
663c0a38 | 437 | |
438 | examine_select(&readfds, &writefds); | |
439 | ||
4ee57cbe | 440 | return Comm::COMM_ERROR; |
663c0a38 | 441 | |
442 | /* NOTREACHED */ | |
443 | } | |
444 | ||
445 | if (num < 0 && !pending) | |
446 | continue; | |
447 | ||
448 | getCurrentTime(); | |
449 | ||
1b826af5 | 450 | debugs(5, num ? 5 : 8, "comm_select: " << num << "+" << pending << " FDs ready"); |
663c0a38 | 451 | |
f30f7998 | 452 | statCounter.select_fds_hist.count(num); |
663c0a38 | 453 | |
663c0a38 | 454 | if (num == 0 && pending == 0) |
455 | continue; | |
456 | ||
457 | /* Scan return fd masks for ready descriptors */ | |
663c0a38 | 458 | assert(readfds.fd_count <= (unsigned int) Biggest_FD); |
663c0a38 | 459 | assert(pendingfds.fd_count <= (unsigned int) Biggest_FD); |
460 | ||
a2f5277a | 461 | for (j = 0; j < (int) readfds.fd_count; ++j) { |
663c0a38 | 462 | register int readfds_handle = readfds.fd_array[j]; |
463 | register int pendingfds_handle = pendingfds.fd_array[j]; | |
464 | register int osfhandle; | |
465 | no_bits = 1; | |
466 | ||
f412b2d6 | 467 | for ( fd = Biggest_FD; fd; --fd ) { |
663c0a38 | 468 | osfhandle = fd_table[fd].win32.handle; |
469 | ||
470 | if (( osfhandle == readfds_handle ) || | |
471 | ( osfhandle == pendingfds_handle )) { | |
472 | if (fd_table[fd].flags.open) { | |
473 | no_bits = 0; | |
474 | break; | |
475 | } | |
476 | } | |
477 | } | |
478 | ||
479 | if (no_bits) | |
480 | continue; | |
481 | ||
482 | #if DEBUG_FDBITS | |
483 | ||
bf8fe701 | 484 | debugs(5, 9, "FD " << fd << " bit set for reading"); |
663c0a38 | 485 | |
08fb215c | 486 | assert(FD_ISSET(fd, readfds)); |
663c0a38 | 487 | |
488 | #endif | |
489 | ||
65d448bc AJ |
490 | if (fdIsUdpListener(fd)) { |
491 | calludp = 1; | |
663c0a38 | 492 | continue; |
493 | } | |
494 | ||
495 | if (fdIsDns(fd)) { | |
496 | calldns = 1; | |
497 | continue; | |
498 | } | |
499 | ||
65d448bc AJ |
500 | if (fdIsTcpListener(fd)) { |
501 | calltcp = 1; | |
663c0a38 | 502 | continue; |
503 | } | |
504 | ||
505 | F = &fd_table[fd]; | |
bf8fe701 | 506 | debugs(5, 6, "comm_select: FD " << fd << " ready for reading"); |
663c0a38 | 507 | |
65d448bc | 508 | if ((hdl = F->read_handler)) { |
663c0a38 | 509 | F->read_handler = NULL; |
1b826af5 | 510 | F->flags.read_pending = 0; |
663c0a38 | 511 | commUpdateReadBits(fd, NULL); |
512 | hdl(fd, F->read_data); | |
a2f5277a | 513 | ++ statCounter.select_fds; |
663c0a38 | 514 | |
65d448bc AJ |
515 | if (commCheckUdpIncoming) |
516 | comm_select_udp_incoming(); | |
663c0a38 | 517 | |
65d448bc | 518 | if (commCheckDnsIncoming) |
663c0a38 | 519 | comm_select_dns_incoming(); |
520 | ||
65d448bc AJ |
521 | if (commCheckTcpIncoming) |
522 | comm_select_tcp_incoming(); | |
663c0a38 | 523 | } |
524 | } | |
525 | ||
526 | assert(errfds.fd_count <= (unsigned int) Biggest_FD); | |
527 | ||
a2f5277a | 528 | for (j = 0; j < (int) errfds.fd_count; ++j) { |
663c0a38 | 529 | register int errfds_handle = errfds.fd_array[j]; |
530 | ||
f412b2d6 | 531 | for ( fd = Biggest_FD; fd; --fd ) { |
663c0a38 | 532 | if ( fd_table[fd].win32.handle == errfds_handle ) |
533 | break; | |
534 | } | |
535 | ||
536 | if (fd_table[fd].flags.open) { | |
537 | F = &fd_table[fd]; | |
538 | ||
539 | if ((hdl = F->write_handler)) { | |
540 | F->write_handler = NULL; | |
541 | commUpdateWriteBits(fd, NULL); | |
542 | hdl(fd, F->write_data); | |
a2f5277a | 543 | ++ statCounter.select_fds; |
663c0a38 | 544 | } |
545 | } | |
546 | } | |
547 | ||
548 | assert(writefds.fd_count <= (unsigned int) Biggest_FD); | |
549 | ||
a2f5277a | 550 | for (j = 0; j < (int) writefds.fd_count; ++j) { |
663c0a38 | 551 | register int writefds_handle = writefds.fd_array[j]; |
552 | no_bits = 1; | |
553 | ||
f412b2d6 | 554 | for ( fd = Biggest_FD; fd; --fd ) { |
663c0a38 | 555 | if ( fd_table[fd].win32.handle == writefds_handle ) { |
556 | if (fd_table[fd].flags.open) { | |
557 | no_bits = 0; | |
558 | break; | |
559 | } | |
560 | } | |
561 | } | |
562 | ||
563 | if (no_bits) | |
564 | continue; | |
565 | ||
566 | #if DEBUG_FDBITS | |
567 | ||
bf8fe701 | 568 | debugs(5, 9, "FD " << fd << " bit set for writing"); |
663c0a38 | 569 | |
08fb215c | 570 | assert(FD_ISSET(fd, writefds)); |
663c0a38 | 571 | |
572 | #endif | |
573 | ||
65d448bc AJ |
574 | if (fdIsUdpListener(fd)) { |
575 | calludp = 1; | |
663c0a38 | 576 | continue; |
577 | } | |
578 | ||
579 | if (fdIsDns(fd)) { | |
580 | calldns = 1; | |
581 | continue; | |
582 | } | |
583 | ||
65d448bc AJ |
584 | if (fdIsTcpListener(fd)) { |
585 | calltcp = 1; | |
663c0a38 | 586 | continue; |
587 | } | |
588 | ||
589 | F = &fd_table[fd]; | |
48e7baac | 590 | debugs(5, 6, "comm_select: FD " << fd << " ready for writing"); |
663c0a38 | 591 | |
592 | if ((hdl = F->write_handler)) { | |
593 | F->write_handler = NULL; | |
594 | commUpdateWriteBits(fd, NULL); | |
595 | hdl(fd, F->write_data); | |
a2f5277a | 596 | ++ statCounter.select_fds; |
663c0a38 | 597 | |
65d448bc AJ |
598 | if (commCheckUdpIncoming) |
599 | comm_select_udp_incoming(); | |
663c0a38 | 600 | |
65d448bc | 601 | if (commCheckDnsIncoming) |
663c0a38 | 602 | comm_select_dns_incoming(); |
603 | ||
65d448bc AJ |
604 | if (commCheckTcpIncoming) |
605 | comm_select_tcp_incoming(); | |
663c0a38 | 606 | } |
607 | } | |
608 | ||
65d448bc AJ |
609 | if (calludp) |
610 | comm_select_udp_incoming(); | |
663c0a38 | 611 | |
612 | if (calldns) | |
613 | comm_select_dns_incoming(); | |
614 | ||
65d448bc AJ |
615 | if (calltcp) |
616 | comm_select_tcp_incoming(); | |
663c0a38 | 617 | |
663c0a38 | 618 | getCurrentTime(); |
619 | ||
620 | statCounter.select_time += (current_dtime - start); | |
621 | ||
c8407295 | 622 | return Comm::OK; |
3d0ac046 | 623 | } while (timeout > current_dtime); |
4a7a3d56 | 624 | debugs(5, 8, "comm_select: time out: " << squid_curtime); |
663c0a38 | 625 | |
c8407295 | 626 | return Comm::TIMEOUT; |
663c0a38 | 627 | } |
628 | ||
629 | static void | |
630 | comm_select_dns_incoming(void) | |
631 | { | |
632 | int nfds = 0; | |
4d6c8504 | 633 | int fds[3]; |
663c0a38 | 634 | int nevents; |
635 | dns_io_events = 0; | |
636 | ||
055421ee | 637 | if (DnsSocketA < 0 && DnsSocketB < 0) |
663c0a38 | 638 | return; |
639 | ||
f207fe64 FC |
640 | if (DnsSocketA >= 0) { |
641 | fds[nfds] = DnsSocketA; | |
642 | ++nfds; | |
643 | } | |
4d6c8504 | 644 | |
f207fe64 FC |
645 | if (DnsSocketB >= 0) { |
646 | fds[nfds] = DnsSocketB; | |
647 | ++nfds; | |
648 | } | |
663c0a38 | 649 | |
650 | nevents = comm_check_incoming_select_handlers(nfds, fds); | |
651 | ||
652 | if (nevents < 0) | |
653 | return; | |
654 | ||
65d448bc | 655 | incoming_dns_interval += Config.comm_incoming.dns.average - nevents; |
663c0a38 | 656 | |
65d448bc AJ |
657 | if (incoming_dns_interval < Config.comm_incoming.dns.min_poll) |
658 | incoming_dns_interval = Config.comm_incoming.dns.min_poll; | |
663c0a38 | 659 | |
660 | if (incoming_dns_interval > MAX_INCOMING_INTERVAL) | |
661 | incoming_dns_interval = MAX_INCOMING_INTERVAL; | |
662 | ||
663 | if (nevents > INCOMING_DNS_MAX) | |
664 | nevents = INCOMING_DNS_MAX; | |
665 | ||
f30f7998 | 666 | statCounter.comm_dns_incoming.count(nevents); |
663c0a38 | 667 | } |
668 | ||
669 | void | |
d841c88d | 670 | Comm::SelectLoopInit(void) |
663c0a38 | 671 | { |
672 | zero_tv.tv_sec = 0; | |
673 | zero_tv.tv_usec = 0; | |
674 | FD_ZERO(&global_readfds); | |
675 | FD_ZERO(&global_writefds); | |
676 | nreadfds = nwritefds = 0; | |
da9b2c49 | 677 | |
d841c88d AJ |
678 | Mgr::RegisterAction("comm_select_incoming", |
679 | "comm_incoming() stats", | |
680 | commIncomingStats, 0, 1); | |
663c0a38 | 681 | } |
682 | ||
663c0a38 | 683 | /* |
684 | * examine_select - debug routine. | |
685 | * | |
686 | * I spend the day chasing this core dump that occurs when both the client | |
687 | * and the server side of a cache fetch simultaneoulsy abort the | |
688 | * connection. While I haven't really studied the code to figure out how | |
689 | * it happens, the snippet below may prevent the cache from exitting: | |
26ac0430 | 690 | * |
663c0a38 | 691 | * Call this from where the select loop fails. |
692 | */ | |
693 | static int | |
694 | examine_select(fd_set * readfds, fd_set * writefds) | |
695 | { | |
696 | int fd = 0; | |
697 | fd_set read_x; | |
698 | fd_set write_x; | |
699 | ||
700 | struct timeval tv; | |
6d527e0a | 701 | AsyncCall::Pointer ch = NULL; |
663c0a38 | 702 | fde *F = NULL; |
703 | ||
704 | struct stat sb; | |
fa84c01d | 705 | debugs(5, DBG_CRITICAL, "examine_select: Examining open file descriptors..."); |
663c0a38 | 706 | |
a2f5277a | 707 | for (fd = 0; fd < Squid_MaxFD; ++fd) { |
663c0a38 | 708 | FD_ZERO(&read_x); |
709 | FD_ZERO(&write_x); | |
710 | tv.tv_sec = tv.tv_usec = 0; | |
711 | ||
08fb215c | 712 | if (FD_ISSET(fd, readfds)) |
663c0a38 | 713 | FD_SET(fd, &read_x); |
08fb215c | 714 | else if (FD_ISSET(fd, writefds)) |
663c0a38 | 715 | FD_SET(fd, &write_x); |
716 | else | |
717 | continue; | |
718 | ||
a2f5277a | 719 | ++ statCounter.syscalls.selects; |
663c0a38 | 720 | errno = 0; |
721 | ||
722 | if (!fstat(fd, &sb)) { | |
bf8fe701 | 723 | debugs(5, 5, "FD " << fd << " is valid."); |
663c0a38 | 724 | continue; |
725 | } | |
726 | ||
727 | F = &fd_table[fd]; | |
fa84c01d FC |
728 | debugs(5, DBG_CRITICAL, "FD " << fd << ": " << xstrerror()); |
729 | debugs(5, DBG_CRITICAL, "WARNING: FD " << fd << " has handlers, but it's invalid."); | |
730 | debugs(5, DBG_CRITICAL, "FD " << fd << " is a " << fdTypeStr[F->type] << " called '" << F->desc << "'"); | |
731 | debugs(5, DBG_CRITICAL, "tmout:" << F->timeoutHandler << " read:" << F->read_handler << " write:" << F->write_handler); | |
663c0a38 | 732 | |
1b826af5 | 733 | for (ch = F->closeHandler; ch != NULL; ch = ch->Next()) |
fa84c01d | 734 | debugs(5, DBG_CRITICAL, " close handler: " << ch); |
663c0a38 | 735 | |
6d527e0a | 736 | if (F->closeHandler != NULL) { |
663c0a38 | 737 | commCallCloseHandlers(fd); |
6d527e0a | 738 | } else if (F->timeoutHandler != NULL) { |
fa84c01d | 739 | debugs(5, DBG_CRITICAL, "examine_select: Calling Timeout Handler"); |
26ac0430 | 740 | ScheduleCallHere(F->timeoutHandler); |
663c0a38 | 741 | } |
742 | ||
743 | F->closeHandler = NULL; | |
6d527e0a | 744 | F->timeoutHandler = NULL; |
663c0a38 | 745 | F->read_handler = NULL; |
746 | F->write_handler = NULL; | |
747 | FD_CLR(fd, readfds); | |
748 | FD_CLR(fd, writefds); | |
749 | } | |
750 | ||
751 | return 0; | |
752 | } | |
753 | ||
663c0a38 | 754 | static void |
755 | commIncomingStats(StoreEntry * sentry) | |
756 | { | |
65d448bc AJ |
757 | storeAppendPrintf(sentry, "Current incoming_udp_interval: %d\n", |
758 | incoming_udp_interval >> INCOMING_FACTOR); | |
663c0a38 | 759 | storeAppendPrintf(sentry, "Current incoming_dns_interval: %d\n", |
760 | incoming_dns_interval >> INCOMING_FACTOR); | |
65d448bc AJ |
761 | storeAppendPrintf(sentry, "Current incoming_tcp_interval: %d\n", |
762 | incoming_tcp_interval >> INCOMING_FACTOR); | |
663c0a38 | 763 | storeAppendPrintf(sentry, "\n"); |
764 | storeAppendPrintf(sentry, "Histogram of events per incoming socket type\n"); | |
65d448bc AJ |
765 | storeAppendPrintf(sentry, "ICP Messages handled per comm_select_udp_incoming() call:\n"); |
766 | statCounter.comm_udp_incoming.dump(sentry, statHistIntDumper); | |
663c0a38 | 767 | storeAppendPrintf(sentry, "DNS Messages handled per comm_select_dns_incoming() call:\n"); |
82146cc8 | 768 | statCounter.comm_dns_incoming.dump(sentry, statHistIntDumper); |
65d448bc AJ |
769 | storeAppendPrintf(sentry, "HTTP Messages handled per comm_select_tcp_incoming() call:\n"); |
770 | statCounter.comm_tcp_incoming.dump(sentry, statHistIntDumper); | |
663c0a38 | 771 | } |
772 | ||
773 | void | |
774 | commUpdateReadBits(int fd, PF * handler) | |
775 | { | |
08fb215c | 776 | if (handler && !FD_ISSET(fd, &global_readfds)) { |
663c0a38 | 777 | FD_SET(fd, &global_readfds); |
a2f5277a | 778 | ++nreadfds; |
08fb215c | 779 | } else if (!handler && FD_ISSET(fd, &global_readfds)) { |
663c0a38 | 780 | FD_CLR(fd, &global_readfds); |
a2f5277a | 781 | --nreadfds; |
663c0a38 | 782 | } |
783 | } | |
784 | ||
785 | void | |
786 | commUpdateWriteBits(int fd, PF * handler) | |
787 | { | |
08fb215c | 788 | if (handler && !FD_ISSET(fd, &global_writefds)) { |
663c0a38 | 789 | FD_SET(fd, &global_writefds); |
a2f5277a | 790 | ++nwritefds; |
08fb215c | 791 | } else if (!handler && FD_ISSET(fd, &global_writefds)) { |
663c0a38 | 792 | FD_CLR(fd, &global_writefds); |
a2f5277a | 793 | --nwritefds; |
663c0a38 | 794 | } |
795 | } | |
796 | ||
797 | /* Called by async-io or diskd to speed up the polling */ | |
798 | void | |
d841c88d | 799 | Comm::QuickPollRequired(void) |
663c0a38 | 800 | { |
801 | MAX_POLL_TIME = 10; | |
802 | } | |
803 | ||
804 | #endif /* USE_SELECT_WIN32 */ | |
f53969cc | 805 |