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Commit | Line | Data |
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663c0a38 | 1 | /* |
b8ae064d | 2 | * Copyright (C) 1996-2023 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" |
e1656dc4 | 20 | #include "StatCounters.h" |
00a7574e | 21 | #include "StatHist.h" |
663c0a38 | 22 | #include "Store.h" |
663c0a38 | 23 | |
1a30fdf5 | 24 | #include <cerrno> |
21d845b1 | 25 | |
f53969cc | 26 | static int MAX_POLL_TIME = 1000; /* see also Comm::QuickPollRequired() */ |
663c0a38 | 27 | |
28 | #ifndef howmany | |
29 | #define howmany(x, y) (((x)+((y)-1))/(y)) | |
30 | #endif | |
31 | #ifndef NBBY | |
32 | #define NBBY 8 | |
33 | #endif | |
34 | #define FD_MASK_BYTES sizeof(fd_mask) | |
35 | #define FD_MASK_BITS (FD_MASK_BYTES*NBBY) | |
36 | ||
37 | /* STATIC */ | |
38 | static int examine_select(fd_set *, fd_set *); | |
65d448bc AJ |
39 | static int fdIsTcpListener(int fd); |
40 | static int fdIsUdpListener(int fd); | |
663c0a38 | 41 | static int fdIsDns(int fd); |
42 | static OBJH commIncomingStats; | |
43 | static int comm_check_incoming_select_handlers(int nfds, int *fds); | |
44 | static void comm_select_dns_incoming(void); | |
45 | static void commUpdateReadBits(int fd, PF * handler); | |
46 | static void commUpdateWriteBits(int fd, PF * handler); | |
47 | ||
663c0a38 | 48 | static struct timeval zero_tv; |
49 | static fd_set global_readfds; | |
50 | static fd_set global_writefds; | |
51 | static int nreadfds; | |
52 | static int nwritefds; | |
53 | ||
54 | /* | |
55 | * Automatic tuning for incoming requests: | |
56 | * | |
57 | * INCOMING sockets are the ICP and HTTP ports. We need to check these | |
58 | * fairly regularly, but how often? When the load increases, we | |
59 | * want to check the incoming sockets more often. If we have a lot | |
60 | * of incoming ICP, then we need to check these sockets more than | |
61 | * if we just have HTTP. | |
62 | * | |
65d448bc | 63 | * The variables 'incoming_udp_interval' and 'incoming_tcp_interval' |
663c0a38 | 64 | * determine how many normal I/O events to process before checking |
65 | * incoming sockets again. Note we store the incoming_interval | |
2f8abb64 | 66 | * multiplied by a factor of (2^INCOMING_FACTOR) to have some |
663c0a38 | 67 | * pseudo-floating point precision. |
68 | * | |
65d448bc | 69 | * The variable 'udp_io_events' and 'tcp_io_events' counts how many normal |
663c0a38 | 70 | * I/O events have been processed since the last check on the incoming |
71 | * sockets. When io_events > incoming_interval, its time to check incoming | |
72 | * sockets. | |
73 | * | |
74 | * Every time we check incoming sockets, we count how many new messages | |
75 | * or connections were processed. This is used to adjust the | |
76 | * incoming_interval for the next iteration. The new incoming_interval | |
77 | * is calculated as the current incoming_interval plus what we would | |
78 | * like to see as an average number of events minus the number of | |
79 | * events just processed. | |
80 | * | |
81 | * incoming_interval = incoming_interval + target_average - number_of_events_processed | |
82 | * | |
65d448bc | 83 | * There are separate incoming_interval counters for DNS, UDP and TCP events |
26ac0430 | 84 | * |
663c0a38 | 85 | * You can see the current values of the incoming_interval's, as well as |
86 | * a histogram of 'incoming_events' by asking the cache manager | |
87 | * for 'comm_incoming', e.g.: | |
88 | * | |
89 | * % ./client mgr:comm_incoming | |
90 | * | |
91 | * Caveats: | |
92 | * | |
93 | * - We have MAX_INCOMING_INTEGER as a magic upper limit on | |
94 | * incoming_interval for both types of sockets. At the | |
95 | * largest value the cache will effectively be idling. | |
96 | * | |
97 | * - The higher the INCOMING_FACTOR, the slower the algorithm will | |
98 | * respond to load spikes/increases/decreases in demand. A value | |
99 | * between 3 and 8 is recommended. | |
100 | */ | |
101 | ||
102 | #define MAX_INCOMING_INTEGER 256 | |
103 | #define INCOMING_FACTOR 5 | |
104 | #define MAX_INCOMING_INTERVAL (MAX_INCOMING_INTEGER << INCOMING_FACTOR) | |
65d448bc | 105 | static int udp_io_events = 0; |
663c0a38 | 106 | static int dns_io_events = 0; |
65d448bc AJ |
107 | static int tcp_io_events = 0; |
108 | static int incoming_udp_interval = 16 << INCOMING_FACTOR; | |
663c0a38 | 109 | static int incoming_dns_interval = 16 << INCOMING_FACTOR; |
65d448bc AJ |
110 | static int incoming_tcp_interval = 16 << INCOMING_FACTOR; |
111 | #define commCheckUdpIncoming (++udp_io_events > (incoming_udp_interval>> INCOMING_FACTOR)) | |
112 | #define commCheckDnsIncoming (++dns_io_events > (incoming_dns_interval>> INCOMING_FACTOR)) | |
113 | #define commCheckTcpIncoming (++tcp_io_events > (incoming_tcp_interval>> INCOMING_FACTOR)) | |
663c0a38 | 114 | |
115 | void | |
d841c88d | 116 | Comm::SetSelect(int fd, unsigned int type, PF * handler, void *client_data, time_t timeout) |
663c0a38 | 117 | { |
118 | fde *F = &fd_table[fd]; | |
119 | assert(fd >= 0); | |
508e3438 | 120 | assert(F->flags.open || (!handler && !client_data && !timeout)); |
bf95c10a | 121 | debugs(5, 5, "FD " << fd << ", type=" << type << |
48e7baac AJ |
122 | ", handler=" << handler << ", client_data=" << client_data << |
123 | ", timeout=" << timeout); | |
663c0a38 | 124 | |
125 | if (type & COMM_SELECT_READ) { | |
126 | F->read_handler = handler; | |
127 | F->read_data = client_data; | |
128 | commUpdateReadBits(fd, handler); | |
129 | } | |
130 | ||
131 | if (type & COMM_SELECT_WRITE) { | |
132 | F->write_handler = handler; | |
133 | F->write_data = client_data; | |
134 | commUpdateWriteBits(fd, handler); | |
135 | } | |
136 | ||
137 | if (timeout) | |
138 | F->timeout = squid_curtime + timeout; | |
139 | } | |
140 | ||
663c0a38 | 141 | static int |
65d448bc | 142 | fdIsUdpListener(int fd) |
663c0a38 | 143 | { |
f8171fc7 | 144 | if (icpIncomingConn != NULL && fd == icpIncomingConn->fd) |
663c0a38 | 145 | return 1; |
146 | ||
f8171fc7 | 147 | if (icpOutgoingConn != NULL && fd == icpOutgoingConn->fd) |
663c0a38 | 148 | return 1; |
149 | ||
150 | return 0; | |
151 | } | |
152 | ||
153 | static int | |
154 | fdIsDns(int fd) | |
155 | { | |
4d6c8504 AJ |
156 | if (fd == DnsSocketA) |
157 | return 1; | |
158 | ||
159 | if (fd == DnsSocketB) | |
663c0a38 | 160 | return 1; |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
165 | static int | |
65d448bc | 166 | fdIsTcpListener(int fd) |
663c0a38 | 167 | { |
d00790b2 | 168 | for (AnyP::PortCfgPointer s = HttpPortList; s != NULL; s = s->next) { |
65d448bc | 169 | if (s->listenConn != NULL && s->listenConn->fd == fd) |
663c0a38 | 170 | return 1; |
171 | } | |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
663c0a38 | 176 | static int |
177 | comm_check_incoming_select_handlers(int nfds, int *fds) | |
178 | { | |
179 | int i; | |
180 | int fd; | |
181 | int maxfd = 0; | |
a1b1756c | 182 | PF *hdl = nullptr; |
663c0a38 | 183 | fd_set read_mask; |
184 | fd_set write_mask; | |
663c0a38 | 185 | FD_ZERO(&read_mask); |
186 | FD_ZERO(&write_mask); | |
187 | incoming_sockets_accepted = 0; | |
188 | ||
a2f5277a | 189 | for (i = 0; i < nfds; ++i) { |
663c0a38 | 190 | fd = fds[i]; |
191 | ||
192 | if (fd_table[fd].read_handler) { | |
193 | FD_SET(fd, &read_mask); | |
194 | ||
195 | if (fd > maxfd) | |
196 | maxfd = fd; | |
197 | } | |
198 | ||
199 | if (fd_table[fd].write_handler) { | |
200 | FD_SET(fd, &write_mask); | |
201 | ||
202 | if (fd > maxfd) | |
203 | maxfd = fd; | |
204 | } | |
205 | } | |
206 | ||
207 | if (maxfd++ == 0) | |
208 | return -1; | |
209 | ||
210 | getCurrentTime(); | |
211 | ||
a2f5277a | 212 | ++ statCounter.syscalls.selects; |
663c0a38 | 213 | |
a1b1756c | 214 | if (select(maxfd, &read_mask, &write_mask, nullptr, &zero_tv) < 1) |
663c0a38 | 215 | return incoming_sockets_accepted; |
216 | ||
a2f5277a | 217 | for (i = 0; i < nfds; ++i) { |
663c0a38 | 218 | fd = fds[i]; |
219 | ||
08fb215c | 220 | if (FD_ISSET(fd, &read_mask)) { |
663c0a38 | 221 | if ((hdl = fd_table[fd].read_handler) != NULL) { |
a1b1756c AJ |
222 | fd_table[fd].read_handler = nullptr; |
223 | commUpdateReadBits(fd, nullptr); | |
663c0a38 | 224 | hdl(fd, fd_table[fd].read_data); |
225 | } else { | |
e0236918 | 226 | debugs(5, DBG_IMPORTANT, "comm_select_incoming: FD " << fd << " NULL read handler"); |
663c0a38 | 227 | } |
228 | } | |
229 | ||
08fb215c | 230 | if (FD_ISSET(fd, &write_mask)) { |
663c0a38 | 231 | if ((hdl = fd_table[fd].write_handler) != NULL) { |
a1b1756c AJ |
232 | fd_table[fd].write_handler = nullptr; |
233 | commUpdateWriteBits(fd, nullptr); | |
663c0a38 | 234 | hdl(fd, fd_table[fd].write_data); |
235 | } else { | |
e0236918 | 236 | debugs(5, DBG_IMPORTANT, "comm_select_incoming: FD " << fd << " NULL write handler"); |
663c0a38 | 237 | } |
238 | } | |
239 | } | |
240 | ||
241 | return incoming_sockets_accepted; | |
242 | } | |
243 | ||
244 | static void | |
65d448bc | 245 | comm_select_udp_incoming(void) |
663c0a38 | 246 | { |
247 | int nfds = 0; | |
248 | int fds[2]; | |
249 | int nevents; | |
65d448bc | 250 | udp_io_events = 0; |
663c0a38 | 251 | |
f207fe64 FC |
252 | if (Comm::IsConnOpen(icpIncomingConn)) { |
253 | fds[nfds] = icpIncomingConn->fd; | |
254 | ++nfds; | |
255 | } | |
663c0a38 | 256 | |
f207fe64 FC |
257 | if (Comm::IsConnOpen(icpOutgoingConn) && icpIncomingConn != icpOutgoingConn) { |
258 | fds[nfds] = icpOutgoingConn->fd; | |
259 | ++nfds; | |
260 | } | |
663c0a38 | 261 | |
262 | if (nfds == 0) | |
263 | return; | |
264 | ||
265 | nevents = comm_check_incoming_select_handlers(nfds, fds); | |
266 | ||
f6d258c8 | 267 | incoming_udp_interval += Config.comm_incoming.udp.average - nevents; |
663c0a38 | 268 | |
65d448bc AJ |
269 | if (incoming_udp_interval < 0) |
270 | incoming_udp_interval = 0; | |
663c0a38 | 271 | |
65d448bc AJ |
272 | if (incoming_udp_interval > MAX_INCOMING_INTERVAL) |
273 | incoming_udp_interval = MAX_INCOMING_INTERVAL; | |
663c0a38 | 274 | |
65d448bc AJ |
275 | if (nevents > INCOMING_UDP_MAX) |
276 | nevents = INCOMING_UDP_MAX; | |
663c0a38 | 277 | |
65d448bc | 278 | statCounter.comm_udp_incoming.count(nevents); |
663c0a38 | 279 | } |
280 | ||
281 | static void | |
65d448bc | 282 | comm_select_tcp_incoming(void) |
663c0a38 | 283 | { |
284 | int nfds = 0; | |
65d448bc | 285 | int fds[MAXTCPLISTENPORTS]; |
663c0a38 | 286 | int nevents; |
65d448bc | 287 | tcp_io_events = 0; |
663c0a38 | 288 | |
65d448bc | 289 | // XXX: only poll sockets that won't be deferred. But how do we identify them? |
663c0a38 | 290 | |
d00790b2 | 291 | for (AnyP::PortCfgPointer s = HttpPortList; s != NULL; s = s->next) { |
f207fe64 FC |
292 | if (Comm::IsConnOpen(s->listenConn)) { |
293 | fds[nfds] = s->listenConn->fd; | |
294 | ++nfds; | |
295 | } | |
663c0a38 | 296 | } |
297 | ||
298 | nevents = comm_check_incoming_select_handlers(nfds, fds); | |
f6d258c8 | 299 | incoming_tcp_interval += Config.comm_incoming.tcp.average - nevents; |
663c0a38 | 300 | |
65d448bc AJ |
301 | if (incoming_tcp_interval < 0) |
302 | incoming_tcp_interval = 0; | |
663c0a38 | 303 | |
65d448bc AJ |
304 | if (incoming_tcp_interval > MAX_INCOMING_INTERVAL) |
305 | incoming_tcp_interval = MAX_INCOMING_INTERVAL; | |
663c0a38 | 306 | |
65d448bc AJ |
307 | if (nevents > INCOMING_TCP_MAX) |
308 | nevents = INCOMING_TCP_MAX; | |
663c0a38 | 309 | |
65d448bc | 310 | statCounter.comm_tcp_incoming.count(nevents); |
663c0a38 | 311 | } |
312 | ||
663c0a38 | 313 | /* Select on all sockets; call handlers for those that are ready. */ |
c8407295 | 314 | Comm::Flag |
d841c88d | 315 | Comm::DoSelect(int msec) |
663c0a38 | 316 | { |
317 | fd_set readfds; | |
318 | fd_set pendingfds; | |
319 | fd_set writefds; | |
663c0a38 | 320 | |
a1b1756c | 321 | PF *hdl = nullptr; |
663c0a38 | 322 | int fd; |
323 | int maxfd; | |
324 | int num; | |
325 | int pending; | |
f6d258c8 | 326 | int calldns = 0, calludp = 0, calltcp = 0; |
663c0a38 | 327 | int j; |
663c0a38 | 328 | struct timeval poll_time; |
329 | double timeout = current_dtime + (msec / 1000.0); | |
330 | fde *F; | |
331 | ||
332 | int no_bits; | |
333 | fd_set errfds; | |
334 | FD_ZERO(&errfds); | |
335 | ||
336 | do { | |
337 | double start; | |
338 | getCurrentTime(); | |
339 | start = current_dtime; | |
663c0a38 | 340 | |
65d448bc AJ |
341 | if (commCheckUdpIncoming) |
342 | comm_select_udp_incoming(); | |
663c0a38 | 343 | |
65d448bc | 344 | if (commCheckDnsIncoming) |
663c0a38 | 345 | comm_select_dns_incoming(); |
346 | ||
65d448bc AJ |
347 | if (commCheckTcpIncoming) |
348 | comm_select_tcp_incoming(); | |
663c0a38 | 349 | |
f6d258c8 | 350 | calldns = calludp = calltcp = 0; |
663c0a38 | 351 | |
352 | maxfd = Biggest_FD + 1; | |
353 | ||
41d00cd3 | 354 | memcpy(&readfds, &global_readfds, sizeof(global_readfds)); |
663c0a38 | 355 | |
41d00cd3 | 356 | memcpy(&writefds, &global_writefds, sizeof(global_writefds)); |
663c0a38 | 357 | |
41d00cd3 | 358 | memcpy(&errfds, &global_writefds, sizeof(global_writefds)); |
663c0a38 | 359 | |
360 | /* remove stalled FDs, and deal with pending descriptors */ | |
361 | pending = 0; | |
362 | ||
363 | FD_ZERO(&pendingfds); | |
364 | ||
a2f5277a | 365 | for (j = 0; j < (int) readfds.fd_count; ++j) { |
663c0a38 | 366 | register int readfds_handle = readfds.fd_array[j]; |
367 | no_bits = 1; | |
368 | ||
f412b2d6 | 369 | for ( fd = Biggest_FD; fd; --fd ) { |
663c0a38 | 370 | if ( fd_table[fd].win32.handle == readfds_handle ) { |
371 | if (fd_table[fd].flags.open) { | |
372 | no_bits = 0; | |
373 | break; | |
374 | } | |
375 | } | |
376 | } | |
377 | ||
378 | if (no_bits) | |
379 | continue; | |
380 | ||
08fb215c | 381 | if (FD_ISSET(fd, &readfds) && fd_table[fd].flags.read_pending) { |
663c0a38 | 382 | FD_SET(fd, &pendingfds); |
a2f5277a | 383 | ++pending; |
663c0a38 | 384 | } |
385 | } | |
386 | ||
663c0a38 | 387 | if (nreadfds + nwritefds == 0) { |
388 | assert(shutting_down); | |
23ff0bee | 389 | return Comm::SHUTDOWN; |
663c0a38 | 390 | } |
391 | ||
392 | if (msec > MAX_POLL_TIME) | |
393 | msec = MAX_POLL_TIME; | |
394 | ||
663c0a38 | 395 | if (pending) |
396 | msec = 0; | |
397 | ||
398 | for (;;) { | |
399 | poll_time.tv_sec = msec / 1000; | |
400 | poll_time.tv_usec = (msec % 1000) * 1000; | |
f6d258c8 | 401 | ++ statCounter.syscalls.selects; |
663c0a38 | 402 | num = select(maxfd, &readfds, &writefds, &errfds, &poll_time); |
b69e9ffa | 403 | int xerrno = errno; |
f6d258c8 | 404 | ++ statCounter.select_loops; |
663c0a38 | 405 | |
406 | if (num >= 0 || pending > 0) | |
407 | break; | |
408 | ||
b69e9ffa | 409 | if (ignoreErrno(xerrno)) |
663c0a38 | 410 | break; |
411 | ||
b69e9ffa | 412 | debugs(5, DBG_CRITICAL, MYNAME << "WARNING: select failure: " << xstrerr(xerrno)); |
663c0a38 | 413 | |
414 | examine_select(&readfds, &writefds); | |
415 | ||
4ee57cbe | 416 | return Comm::COMM_ERROR; |
663c0a38 | 417 | |
418 | /* NOTREACHED */ | |
419 | } | |
420 | ||
421 | if (num < 0 && !pending) | |
422 | continue; | |
423 | ||
424 | getCurrentTime(); | |
425 | ||
1b826af5 | 426 | debugs(5, num ? 5 : 8, "comm_select: " << num << "+" << pending << " FDs ready"); |
663c0a38 | 427 | |
f30f7998 | 428 | statCounter.select_fds_hist.count(num); |
663c0a38 | 429 | |
663c0a38 | 430 | if (num == 0 && pending == 0) |
431 | continue; | |
432 | ||
433 | /* Scan return fd masks for ready descriptors */ | |
663c0a38 | 434 | assert(readfds.fd_count <= (unsigned int) Biggest_FD); |
663c0a38 | 435 | assert(pendingfds.fd_count <= (unsigned int) Biggest_FD); |
436 | ||
a2f5277a | 437 | for (j = 0; j < (int) readfds.fd_count; ++j) { |
663c0a38 | 438 | register int readfds_handle = readfds.fd_array[j]; |
439 | register int pendingfds_handle = pendingfds.fd_array[j]; | |
440 | register int osfhandle; | |
441 | no_bits = 1; | |
442 | ||
f412b2d6 | 443 | for ( fd = Biggest_FD; fd; --fd ) { |
663c0a38 | 444 | osfhandle = fd_table[fd].win32.handle; |
445 | ||
446 | if (( osfhandle == readfds_handle ) || | |
447 | ( osfhandle == pendingfds_handle )) { | |
448 | if (fd_table[fd].flags.open) { | |
449 | no_bits = 0; | |
450 | break; | |
451 | } | |
452 | } | |
453 | } | |
454 | ||
455 | if (no_bits) | |
456 | continue; | |
457 | ||
65d448bc AJ |
458 | if (fdIsUdpListener(fd)) { |
459 | calludp = 1; | |
663c0a38 | 460 | continue; |
461 | } | |
462 | ||
463 | if (fdIsDns(fd)) { | |
464 | calldns = 1; | |
465 | continue; | |
466 | } | |
467 | ||
65d448bc AJ |
468 | if (fdIsTcpListener(fd)) { |
469 | calltcp = 1; | |
663c0a38 | 470 | continue; |
471 | } | |
472 | ||
473 | F = &fd_table[fd]; | |
bf8fe701 | 474 | debugs(5, 6, "comm_select: FD " << fd << " ready for reading"); |
663c0a38 | 475 | |
65d448bc | 476 | if ((hdl = F->read_handler)) { |
a1b1756c AJ |
477 | F->read_handler = nullptr; |
478 | commUpdateReadBits(fd, nullptr); | |
663c0a38 | 479 | hdl(fd, F->read_data); |
a2f5277a | 480 | ++ statCounter.select_fds; |
663c0a38 | 481 | |
65d448bc AJ |
482 | if (commCheckUdpIncoming) |
483 | comm_select_udp_incoming(); | |
663c0a38 | 484 | |
65d448bc | 485 | if (commCheckDnsIncoming) |
663c0a38 | 486 | comm_select_dns_incoming(); |
487 | ||
65d448bc AJ |
488 | if (commCheckTcpIncoming) |
489 | comm_select_tcp_incoming(); | |
663c0a38 | 490 | } |
491 | } | |
492 | ||
493 | assert(errfds.fd_count <= (unsigned int) Biggest_FD); | |
494 | ||
a2f5277a | 495 | for (j = 0; j < (int) errfds.fd_count; ++j) { |
663c0a38 | 496 | register int errfds_handle = errfds.fd_array[j]; |
497 | ||
f412b2d6 | 498 | for ( fd = Biggest_FD; fd; --fd ) { |
663c0a38 | 499 | if ( fd_table[fd].win32.handle == errfds_handle ) |
500 | break; | |
501 | } | |
502 | ||
503 | if (fd_table[fd].flags.open) { | |
504 | F = &fd_table[fd]; | |
505 | ||
506 | if ((hdl = F->write_handler)) { | |
a1b1756c AJ |
507 | F->write_handler = nullptr; |
508 | commUpdateWriteBits(fd, nullptr); | |
663c0a38 | 509 | hdl(fd, F->write_data); |
a2f5277a | 510 | ++ statCounter.select_fds; |
663c0a38 | 511 | } |
512 | } | |
513 | } | |
514 | ||
515 | assert(writefds.fd_count <= (unsigned int) Biggest_FD); | |
516 | ||
a2f5277a | 517 | for (j = 0; j < (int) writefds.fd_count; ++j) { |
663c0a38 | 518 | register int writefds_handle = writefds.fd_array[j]; |
519 | no_bits = 1; | |
520 | ||
f412b2d6 | 521 | for ( fd = Biggest_FD; fd; --fd ) { |
663c0a38 | 522 | if ( fd_table[fd].win32.handle == writefds_handle ) { |
523 | if (fd_table[fd].flags.open) { | |
524 | no_bits = 0; | |
525 | break; | |
526 | } | |
527 | } | |
528 | } | |
529 | ||
530 | if (no_bits) | |
531 | continue; | |
532 | ||
65d448bc AJ |
533 | if (fdIsUdpListener(fd)) { |
534 | calludp = 1; | |
663c0a38 | 535 | continue; |
536 | } | |
537 | ||
538 | if (fdIsDns(fd)) { | |
539 | calldns = 1; | |
540 | continue; | |
541 | } | |
542 | ||
65d448bc AJ |
543 | if (fdIsTcpListener(fd)) { |
544 | calltcp = 1; | |
663c0a38 | 545 | continue; |
546 | } | |
547 | ||
548 | F = &fd_table[fd]; | |
48e7baac | 549 | debugs(5, 6, "comm_select: FD " << fd << " ready for writing"); |
663c0a38 | 550 | |
551 | if ((hdl = F->write_handler)) { | |
a1b1756c AJ |
552 | F->write_handler = nullptr; |
553 | commUpdateWriteBits(fd, nullptr); | |
663c0a38 | 554 | hdl(fd, F->write_data); |
a2f5277a | 555 | ++ statCounter.select_fds; |
663c0a38 | 556 | |
65d448bc AJ |
557 | if (commCheckUdpIncoming) |
558 | comm_select_udp_incoming(); | |
663c0a38 | 559 | |
65d448bc | 560 | if (commCheckDnsIncoming) |
663c0a38 | 561 | comm_select_dns_incoming(); |
562 | ||
65d448bc AJ |
563 | if (commCheckTcpIncoming) |
564 | comm_select_tcp_incoming(); | |
663c0a38 | 565 | } |
566 | } | |
567 | ||
65d448bc AJ |
568 | if (calludp) |
569 | comm_select_udp_incoming(); | |
663c0a38 | 570 | |
571 | if (calldns) | |
572 | comm_select_dns_incoming(); | |
573 | ||
65d448bc AJ |
574 | if (calltcp) |
575 | comm_select_tcp_incoming(); | |
663c0a38 | 576 | |
663c0a38 | 577 | getCurrentTime(); |
578 | ||
579 | statCounter.select_time += (current_dtime - start); | |
580 | ||
c8407295 | 581 | return Comm::OK; |
3d0ac046 | 582 | } while (timeout > current_dtime); |
4a7a3d56 | 583 | debugs(5, 8, "comm_select: time out: " << squid_curtime); |
663c0a38 | 584 | |
c8407295 | 585 | return Comm::TIMEOUT; |
663c0a38 | 586 | } |
587 | ||
588 | static void | |
589 | comm_select_dns_incoming(void) | |
590 | { | |
591 | int nfds = 0; | |
4d6c8504 | 592 | int fds[3]; |
663c0a38 | 593 | int nevents; |
594 | dns_io_events = 0; | |
595 | ||
055421ee | 596 | if (DnsSocketA < 0 && DnsSocketB < 0) |
663c0a38 | 597 | return; |
598 | ||
f207fe64 FC |
599 | if (DnsSocketA >= 0) { |
600 | fds[nfds] = DnsSocketA; | |
601 | ++nfds; | |
602 | } | |
4d6c8504 | 603 | |
f207fe64 FC |
604 | if (DnsSocketB >= 0) { |
605 | fds[nfds] = DnsSocketB; | |
606 | ++nfds; | |
607 | } | |
663c0a38 | 608 | |
609 | nevents = comm_check_incoming_select_handlers(nfds, fds); | |
610 | ||
611 | if (nevents < 0) | |
612 | return; | |
613 | ||
65d448bc | 614 | incoming_dns_interval += Config.comm_incoming.dns.average - nevents; |
663c0a38 | 615 | |
65d448bc AJ |
616 | if (incoming_dns_interval < Config.comm_incoming.dns.min_poll) |
617 | incoming_dns_interval = Config.comm_incoming.dns.min_poll; | |
663c0a38 | 618 | |
619 | if (incoming_dns_interval > MAX_INCOMING_INTERVAL) | |
620 | incoming_dns_interval = MAX_INCOMING_INTERVAL; | |
621 | ||
622 | if (nevents > INCOMING_DNS_MAX) | |
623 | nevents = INCOMING_DNS_MAX; | |
624 | ||
f30f7998 | 625 | statCounter.comm_dns_incoming.count(nevents); |
663c0a38 | 626 | } |
627 | ||
628 | void | |
d841c88d | 629 | Comm::SelectLoopInit(void) |
663c0a38 | 630 | { |
631 | zero_tv.tv_sec = 0; | |
632 | zero_tv.tv_usec = 0; | |
633 | FD_ZERO(&global_readfds); | |
634 | FD_ZERO(&global_writefds); | |
635 | nreadfds = nwritefds = 0; | |
da9b2c49 | 636 | |
d841c88d AJ |
637 | Mgr::RegisterAction("comm_select_incoming", |
638 | "comm_incoming() stats", | |
639 | commIncomingStats, 0, 1); | |
663c0a38 | 640 | } |
641 | ||
663c0a38 | 642 | /* |
643 | * examine_select - debug routine. | |
644 | * | |
645 | * I spend the day chasing this core dump that occurs when both the client | |
646 | * and the server side of a cache fetch simultaneoulsy abort the | |
647 | * connection. While I haven't really studied the code to figure out how | |
648 | * it happens, the snippet below may prevent the cache from exitting: | |
26ac0430 | 649 | * |
663c0a38 | 650 | * Call this from where the select loop fails. |
651 | */ | |
652 | static int | |
653 | examine_select(fd_set * readfds, fd_set * writefds) | |
654 | { | |
655 | int fd = 0; | |
656 | fd_set read_x; | |
657 | fd_set write_x; | |
658 | ||
659 | struct timeval tv; | |
a1b1756c AJ |
660 | AsyncCall::Pointer ch = nullptr; |
661 | fde *F = nullptr; | |
663c0a38 | 662 | |
663 | struct stat sb; | |
fa84c01d | 664 | debugs(5, DBG_CRITICAL, "examine_select: Examining open file descriptors..."); |
663c0a38 | 665 | |
a2f5277a | 666 | for (fd = 0; fd < Squid_MaxFD; ++fd) { |
663c0a38 | 667 | FD_ZERO(&read_x); |
668 | FD_ZERO(&write_x); | |
669 | tv.tv_sec = tv.tv_usec = 0; | |
670 | ||
08fb215c | 671 | if (FD_ISSET(fd, readfds)) |
663c0a38 | 672 | FD_SET(fd, &read_x); |
08fb215c | 673 | else if (FD_ISSET(fd, writefds)) |
663c0a38 | 674 | FD_SET(fd, &write_x); |
675 | else | |
676 | continue; | |
677 | ||
a2f5277a | 678 | ++ statCounter.syscalls.selects; |
663c0a38 | 679 | errno = 0; |
680 | ||
681 | if (!fstat(fd, &sb)) { | |
bf8fe701 | 682 | debugs(5, 5, "FD " << fd << " is valid."); |
663c0a38 | 683 | continue; |
684 | } | |
b69e9ffa | 685 | int xerrno = errno; |
663c0a38 | 686 | |
687 | F = &fd_table[fd]; | |
b69e9ffa | 688 | debugs(5, DBG_CRITICAL, "fstat(FD " << fd << "): " << xstrerr(xerrno)); |
fa84c01d FC |
689 | debugs(5, DBG_CRITICAL, "WARNING: FD " << fd << " has handlers, but it's invalid."); |
690 | debugs(5, DBG_CRITICAL, "FD " << fd << " is a " << fdTypeStr[F->type] << " called '" << F->desc << "'"); | |
691 | debugs(5, DBG_CRITICAL, "tmout:" << F->timeoutHandler << " read:" << F->read_handler << " write:" << F->write_handler); | |
663c0a38 | 692 | |
1b826af5 | 693 | for (ch = F->closeHandler; ch != NULL; ch = ch->Next()) |
fa84c01d | 694 | debugs(5, DBG_CRITICAL, " close handler: " << ch); |
663c0a38 | 695 | |
6d527e0a | 696 | if (F->closeHandler != NULL) { |
663c0a38 | 697 | commCallCloseHandlers(fd); |
6d527e0a | 698 | } else if (F->timeoutHandler != NULL) { |
fa84c01d | 699 | debugs(5, DBG_CRITICAL, "examine_select: Calling Timeout Handler"); |
26ac0430 | 700 | ScheduleCallHere(F->timeoutHandler); |
663c0a38 | 701 | } |
702 | ||
a1b1756c AJ |
703 | F->closeHandler = nullptr; |
704 | F->timeoutHandler = nullptr; | |
705 | F->read_handler = nullptr; | |
706 | F->write_handler = nullptr; | |
663c0a38 | 707 | FD_CLR(fd, readfds); |
708 | FD_CLR(fd, writefds); | |
709 | } | |
710 | ||
711 | return 0; | |
712 | } | |
713 | ||
663c0a38 | 714 | static void |
715 | commIncomingStats(StoreEntry * sentry) | |
716 | { | |
65d448bc AJ |
717 | storeAppendPrintf(sentry, "Current incoming_udp_interval: %d\n", |
718 | incoming_udp_interval >> INCOMING_FACTOR); | |
663c0a38 | 719 | storeAppendPrintf(sentry, "Current incoming_dns_interval: %d\n", |
720 | incoming_dns_interval >> INCOMING_FACTOR); | |
65d448bc AJ |
721 | storeAppendPrintf(sentry, "Current incoming_tcp_interval: %d\n", |
722 | incoming_tcp_interval >> INCOMING_FACTOR); | |
663c0a38 | 723 | storeAppendPrintf(sentry, "\n"); |
724 | storeAppendPrintf(sentry, "Histogram of events per incoming socket type\n"); | |
65d448bc AJ |
725 | storeAppendPrintf(sentry, "ICP Messages handled per comm_select_udp_incoming() call:\n"); |
726 | statCounter.comm_udp_incoming.dump(sentry, statHistIntDumper); | |
663c0a38 | 727 | storeAppendPrintf(sentry, "DNS Messages handled per comm_select_dns_incoming() call:\n"); |
82146cc8 | 728 | statCounter.comm_dns_incoming.dump(sentry, statHistIntDumper); |
65d448bc AJ |
729 | storeAppendPrintf(sentry, "HTTP Messages handled per comm_select_tcp_incoming() call:\n"); |
730 | statCounter.comm_tcp_incoming.dump(sentry, statHistIntDumper); | |
663c0a38 | 731 | } |
732 | ||
733 | void | |
734 | commUpdateReadBits(int fd, PF * handler) | |
735 | { | |
08fb215c | 736 | if (handler && !FD_ISSET(fd, &global_readfds)) { |
663c0a38 | 737 | FD_SET(fd, &global_readfds); |
a2f5277a | 738 | ++nreadfds; |
08fb215c | 739 | } else if (!handler && FD_ISSET(fd, &global_readfds)) { |
663c0a38 | 740 | FD_CLR(fd, &global_readfds); |
a2f5277a | 741 | --nreadfds; |
663c0a38 | 742 | } |
743 | } | |
744 | ||
745 | void | |
746 | commUpdateWriteBits(int fd, PF * handler) | |
747 | { | |
08fb215c | 748 | if (handler && !FD_ISSET(fd, &global_writefds)) { |
663c0a38 | 749 | FD_SET(fd, &global_writefds); |
a2f5277a | 750 | ++nwritefds; |
08fb215c | 751 | } else if (!handler && FD_ISSET(fd, &global_writefds)) { |
663c0a38 | 752 | FD_CLR(fd, &global_writefds); |
a2f5277a | 753 | --nwritefds; |
663c0a38 | 754 | } |
755 | } | |
756 | ||
757 | /* Called by async-io or diskd to speed up the polling */ | |
758 | void | |
d841c88d | 759 | Comm::QuickPollRequired(void) |
663c0a38 | 760 | { |
761 | MAX_POLL_TIME = 10; | |
762 | } | |
763 | ||
764 | #endif /* USE_SELECT_WIN32 */ | |
f53969cc | 765 |