0
|
1
|
|
2 /*
|
|
3 * Copyright (C) Igor Sysoev
|
|
4 */
|
|
5
|
|
6
|
|
7 #include <ngx_config.h>
|
|
8 #include <ngx_core.h>
|
|
9 #include <ngx_event.h>
|
|
10
|
|
11
|
|
12 static ngx_int_t ngx_poll_init(ngx_cycle_t *cycle);
|
|
13 static void ngx_poll_done(ngx_cycle_t *cycle);
|
|
14 static ngx_int_t ngx_poll_add_event(ngx_event_t *ev, int event, u_int flags);
|
|
15 static ngx_int_t ngx_poll_del_event(ngx_event_t *ev, int event, u_int flags);
|
|
16 static ngx_int_t ngx_poll_process_events(ngx_cycle_t *cycle);
|
|
17 static char *ngx_poll_init_conf(ngx_cycle_t *cycle, void *conf);
|
|
18
|
|
19
|
|
20 static struct pollfd *event_list;
|
|
21 static int nevents;
|
|
22
|
|
23 #if 0
|
|
24 static ngx_event_t **ready_index;
|
|
25 #endif
|
|
26
|
|
27 static ngx_event_t *accept_events;
|
|
28
|
|
29
|
|
30 static ngx_str_t poll_name = ngx_string("poll");
|
|
31
|
|
32 ngx_event_module_t ngx_poll_module_ctx = {
|
|
33 &poll_name,
|
|
34 NULL, /* create configuration */
|
|
35 ngx_poll_init_conf, /* init configuration */
|
|
36
|
|
37 {
|
|
38 ngx_poll_add_event, /* add an event */
|
|
39 ngx_poll_del_event, /* delete an event */
|
|
40 ngx_poll_add_event, /* enable an event */
|
|
41 ngx_poll_del_event, /* disable an event */
|
|
42 NULL, /* add an connection */
|
|
43 NULL, /* delete an connection */
|
|
44 NULL, /* process the changes */
|
|
45 ngx_poll_process_events, /* process the events */
|
|
46 ngx_poll_init, /* init the events */
|
|
47 ngx_poll_done /* done the events */
|
|
48 }
|
|
49
|
|
50 };
|
|
51
|
|
52 ngx_module_t ngx_poll_module = {
|
|
53 NGX_MODULE,
|
|
54 &ngx_poll_module_ctx, /* module context */
|
|
55 NULL, /* module directives */
|
|
56 NGX_EVENT_MODULE, /* module type */
|
|
57 NULL, /* init module */
|
|
58 NULL /* init process */
|
|
59 };
|
|
60
|
|
61
|
|
62
|
|
63 static ngx_int_t ngx_poll_init(ngx_cycle_t *cycle)
|
|
64 {
|
|
65 struct pollfd *list;
|
|
66
|
|
67 if (event_list == NULL) {
|
|
68 nevents = 0;
|
|
69 }
|
|
70
|
|
71 if (ngx_process == NGX_PROCESS_WORKER
|
|
72 || cycle->old_cycle == NULL
|
|
73 || cycle->old_cycle->connection_n < cycle->connection_n)
|
|
74 {
|
|
75 ngx_test_null(list,
|
|
76 ngx_alloc(sizeof(struct pollfd) * cycle->connection_n,
|
|
77 cycle->log),
|
|
78 NGX_ERROR);
|
|
79
|
|
80 if (event_list) {
|
|
81 ngx_memcpy(list, event_list, sizeof(ngx_event_t *) * nevents);
|
|
82 ngx_free(event_list);
|
|
83 }
|
|
84
|
|
85 event_list = list;
|
|
86
|
|
87 #if 0
|
|
88 if (ready_index) {
|
|
89 ngx_free(ready_index);
|
|
90 }
|
|
91
|
|
92 ngx_test_null(ready_index,
|
|
93 ngx_alloc(sizeof(ngx_event_t *) * 2 * cycle->connection_n,
|
|
94 cycle->log),
|
|
95 NGX_ERROR);
|
|
96 #endif
|
|
97 }
|
|
98
|
|
99 ngx_io = ngx_os_io;
|
|
100
|
|
101 ngx_event_actions = ngx_poll_module_ctx.actions;
|
|
102
|
|
103 ngx_event_flags = NGX_USE_LEVEL_EVENT|NGX_USE_ONESHOT_EVENT;
|
|
104
|
|
105 return NGX_OK;
|
|
106 }
|
|
107
|
|
108
|
|
109 static void ngx_poll_done(ngx_cycle_t *cycle)
|
|
110 {
|
|
111 ngx_free(event_list);
|
|
112 #if 0
|
|
113 ngx_free(ready_index);
|
|
114 #endif
|
|
115
|
|
116 event_list = NULL;
|
|
117 #if 0
|
|
118 ready_index = NULL;
|
|
119 #endif
|
|
120 }
|
|
121
|
|
122
|
|
123 static ngx_int_t ngx_poll_add_event(ngx_event_t *ev, int event, u_int flags)
|
|
124 {
|
|
125 ngx_event_t *e;
|
|
126 ngx_connection_t *c;
|
|
127
|
|
128 c = ev->data;
|
|
129
|
|
130 ev->active = 1;
|
|
131
|
|
132 if (ev->index != NGX_INVALID_INDEX) {
|
|
133 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
|
|
134 "poll event fd:%d ev:%d is already set", c->fd, event);
|
|
135 return NGX_OK;
|
|
136 }
|
|
137
|
|
138 if (event == NGX_READ_EVENT) {
|
|
139 e = c->write;
|
|
140 #if (NGX_READ_EVENT != POLLIN)
|
|
141 event = POLLIN;
|
|
142 #endif
|
|
143
|
|
144 } else {
|
|
145 e = c->read;
|
|
146 #if (NGX_WRITE_EVENT != POLLOUT)
|
|
147 event = POLLOUT;
|
|
148 #endif
|
|
149 }
|
|
150
|
|
151 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
|
|
152 "poll add event: fd:%d ev:%d", c->fd, event);
|
|
153
|
|
154 if (e == NULL || e->index == NGX_INVALID_INDEX) {
|
|
155 event_list[nevents].fd = c->fd;
|
|
156 event_list[nevents].events = event;
|
|
157 event_list[nevents].revents = 0;
|
|
158
|
|
159 ev->index = nevents;
|
|
160 nevents++;
|
|
161
|
|
162 } else {
|
|
163 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
|
|
164 "poll add index: %d", e->index);
|
|
165
|
|
166 event_list[e->index].events |= event;
|
|
167 ev->index = e->index;
|
|
168 }
|
|
169
|
|
170 ev->oneshot = (flags & NGX_ONESHOT_EVENT) ? 1 : 0;
|
|
171
|
|
172 return NGX_OK;
|
|
173 }
|
|
174
|
|
175
|
|
176 static ngx_int_t ngx_poll_del_event(ngx_event_t *ev, int event, u_int flags)
|
|
177 {
|
|
178 ngx_uint_t i;
|
|
179 ngx_cycle_t **cycle;
|
|
180 ngx_event_t *e;
|
|
181 ngx_connection_t *c;
|
|
182
|
|
183 c = ev->data;
|
|
184
|
|
185 ev->active = 0;
|
|
186
|
|
187 if (ev->index == NGX_INVALID_INDEX) {
|
|
188 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
|
|
189 "poll event fd:%d ev:%d is already deleted",
|
|
190 c->fd, event);
|
|
191 return NGX_OK;
|
|
192 }
|
|
193
|
|
194 if (event == NGX_READ_EVENT) {
|
|
195 e = c->write;
|
|
196 #if (NGX_READ_EVENT != POLLIN)
|
|
197 event = POLLIN;
|
|
198 #endif
|
|
199
|
|
200 } else {
|
|
201 e = c->read;
|
|
202 #if (NGX_WRITE_EVENT != POLLOUT)
|
|
203 event = POLLOUT;
|
|
204 #endif
|
|
205 }
|
|
206
|
|
207 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
|
|
208 "poll del event: fd:%d ev:%d", c->fd, event);
|
|
209
|
|
210 if (e == NULL || e->index == NGX_INVALID_INDEX) {
|
|
211 nevents--;
|
|
212
|
|
213 if (ev->index < (u_int) nevents) {
|
|
214
|
|
215 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
|
|
216 "index: copy event %d to %d", nevents, ev->index);
|
|
217
|
|
218 event_list[ev->index] = event_list[nevents];
|
|
219
|
|
220 c = &ngx_cycle->connections[event_list[nevents].fd];
|
|
221
|
|
222 if (c->fd == -1) {
|
|
223 cycle = ngx_old_cycles.elts;
|
|
224 for (i = 0; i < ngx_old_cycles.nelts; i++) {
|
|
225 if (cycle[i] == NULL) {
|
|
226 continue;
|
|
227 }
|
|
228 c = &cycle[i]->connections[event_list[nevents].fd];
|
|
229 if (c->fd != -1) {
|
|
230 break;
|
|
231 }
|
|
232 }
|
|
233 }
|
|
234
|
|
235 if (c->fd == -1) {
|
|
236 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
|
|
237 "unexpected last event");
|
|
238
|
|
239 } else {
|
|
240 if (c->read->index == (u_int) nevents) {
|
|
241 c->read->index = ev->index;
|
|
242 }
|
|
243
|
|
244 if (c->write->index == (u_int) nevents) {
|
|
245 c->write->index = ev->index;
|
|
246 }
|
|
247 }
|
|
248 }
|
|
249
|
|
250 } else {
|
|
251 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
|
|
252 "poll del index: %d", e->index);
|
|
253
|
|
254 event_list[e->index].events &= ~event;
|
|
255 }
|
|
256
|
|
257 ev->index = NGX_INVALID_INDEX;
|
|
258
|
|
259 return NGX_OK;
|
|
260 }
|
|
261
|
|
262
|
|
263 static ngx_int_t ngx_poll_process_events(ngx_cycle_t *cycle)
|
|
264 {
|
32
|
265 int ready, revents;
|
0
|
266 ngx_int_t i, nready;
|
|
267 ngx_uint_t n, found, lock, expire;
|
|
268 ngx_msec_t timer;
|
|
269 ngx_err_t err;
|
|
270 ngx_cycle_t **old_cycle;
|
|
271 ngx_event_t *ev;
|
|
272 ngx_epoch_msec_t delta;
|
|
273 ngx_connection_t *c;
|
|
274 struct timeval tv;
|
|
275
|
|
276 for ( ;; ) {
|
|
277 timer = ngx_event_find_timer();
|
|
278
|
|
279 if (timer != 0) {
|
|
280 break;
|
|
281 }
|
|
282
|
|
283 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
284 "poll expired timer");
|
|
285
|
|
286 ngx_event_expire_timers((ngx_msec_t)
|
|
287 (ngx_elapsed_msec - ngx_old_elapsed_msec));
|
|
288 }
|
|
289
|
|
290 /* NGX_TIMER_INFINITE == INFTIM */
|
|
291
|
|
292 if (timer == NGX_TIMER_INFINITE) {
|
|
293 expire = 0;
|
|
294
|
|
295 } else {
|
|
296 expire = 1;
|
|
297 }
|
|
298
|
|
299 ngx_old_elapsed_msec = ngx_elapsed_msec;
|
|
300
|
|
301 #if (NGX_DEBUG0)
|
|
302 if (cycle->log->log_level & NGX_LOG_DEBUG_ALL) {
|
|
303 for (i = 0; i < nevents; i++) {
|
|
304 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
10
|
305 "poll: %d: fd:%d ev:%04Xd",
|
0
|
306 i, event_list[i].fd, event_list[i].events);
|
|
307 }
|
|
308 }
|
|
309 #endif
|
|
310
|
|
311 if (ngx_accept_mutex) {
|
|
312 if (ngx_accept_disabled > 0) {
|
|
313 ngx_accept_disabled--;
|
|
314
|
|
315 } else {
|
|
316 if (ngx_trylock_accept_mutex(cycle) == NGX_ERROR) {
|
|
317 return NGX_ERROR;
|
|
318 }
|
|
319
|
|
320 if (ngx_accept_mutex_held == 0
|
|
321 && (timer == NGX_TIMER_INFINITE
|
|
322 || timer > ngx_accept_mutex_delay))
|
|
323 {
|
|
324 timer = ngx_accept_mutex_delay;
|
|
325 expire = 0;
|
|
326 }
|
|
327 }
|
|
328 }
|
|
329
|
|
330 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "poll timer: %d", timer);
|
|
331
|
|
332 ready = poll(event_list, (u_int) nevents, (int) timer);
|
|
333
|
|
334 if (ready == -1) {
|
|
335 err = ngx_errno;
|
|
336 } else {
|
|
337 err = 0;
|
|
338 }
|
|
339
|
|
340 ngx_gettimeofday(&tv);
|
|
341 ngx_time_update(tv.tv_sec);
|
|
342
|
|
343 delta = ngx_elapsed_msec;
|
|
344 ngx_elapsed_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000
|
|
345 + tv.tv_usec / 1000 - ngx_start_msec;
|
|
346
|
|
347 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
348 "poll ready %d of %d", ready, nevents);
|
|
349
|
|
350 if (err) {
|
|
351 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
|
|
352 cycle->log, err, "poll() failed");
|
|
353 ngx_accept_mutex_unlock();
|
|
354 return NGX_ERROR;
|
|
355 }
|
|
356
|
|
357 if (timer != NGX_TIMER_INFINITE) {
|
|
358 delta = ngx_elapsed_msec - delta;
|
|
359
|
|
360 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
361 "poll timer: %d, delta: %d", timer, (int) delta);
|
|
362 } else {
|
|
363 if (ready == 0) {
|
|
364 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
365 "poll() returned no events without timeout");
|
|
366 ngx_accept_mutex_unlock();
|
|
367 return NGX_ERROR;
|
|
368 }
|
|
369 }
|
|
370
|
|
371 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
372 ngx_accept_mutex_unlock();
|
|
373 return NGX_ERROR;
|
|
374 }
|
|
375
|
|
376 lock = 1;
|
|
377 nready = 0;
|
|
378
|
|
379 for (i = 0; i < nevents && ready; i++) {
|
|
380
|
32
|
381 revents = event_list[i].revents;
|
|
382
|
0
|
383 #if 0
|
|
384 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
10
|
385 "poll: %d: fd:%d ev:%04Xd rev:%04Xd",
|
32
|
386 i, event_list[i].fd, event_list[i].events, revents);
|
0
|
387 #else
|
32
|
388 if (revents) {
|
0
|
389 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
10
|
390 "poll: %d: fd:%d ev:%04Xd rev:%04Xd",
|
32
|
391 i, event_list[i].fd, event_list[i].events, revents);
|
0
|
392 }
|
|
393 #endif
|
|
394
|
32
|
395 if (revents & POLLNVAL) {
|
0
|
396 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
10
|
397 "poll() error fd:%d ev:%04Xd rev:%04Xd",
|
32
|
398 event_list[i].fd, event_list[i].events, revents);
|
0
|
399 }
|
|
400
|
32
|
401 if (revents & ~(POLLIN|POLLOUT|POLLERR|POLLHUP|POLLNVAL)) {
|
0
|
402 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
10
|
403 "strange poll() events fd:%d ev:%04Xd rev:%04Xd",
|
32
|
404 event_list[i].fd, event_list[i].events, revents);
|
0
|
405 }
|
|
406
|
|
407 if (event_list[i].fd == -1) {
|
|
408 /*
|
|
409 * the disabled event, a workaround for our possible bug,
|
|
410 * see the comment below
|
|
411 */
|
|
412 continue;
|
|
413 }
|
|
414
|
|
415 c = &ngx_cycle->connections[event_list[i].fd];
|
|
416
|
|
417 if (c->fd == -1) {
|
|
418 old_cycle = ngx_old_cycles.elts;
|
|
419 for (n = 0; n < ngx_old_cycles.nelts; n++) {
|
|
420 if (old_cycle[n] == NULL) {
|
|
421 continue;
|
|
422 }
|
|
423 c = &old_cycle[n]->connections[event_list[i].fd];
|
|
424 if (c->fd != -1) {
|
|
425 break;
|
|
426 }
|
|
427 }
|
|
428 }
|
|
429
|
|
430 if (c->fd == -1) {
|
|
431 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "unexpected event");
|
|
432
|
|
433 /*
|
|
434 * it is certainly our fault and it should be investigated,
|
|
435 * in the meantime we disable this event to avoid a CPU spinning
|
|
436 */
|
|
437
|
|
438 if (i == nevents - 1) {
|
|
439 nevents--;
|
|
440 } else {
|
|
441 event_list[i].fd = -1;
|
|
442 }
|
|
443
|
|
444 continue;
|
|
445 }
|
|
446
|
32
|
447 if ((revents & (POLLERR|POLLHUP|POLLNVAL))
|
|
448 && (revents & (POLLIN|POLLOUT)) == 0)
|
|
449 {
|
|
450 /*
|
|
451 * if the error events were returned without POLLIN or POLLOUT,
|
|
452 * then add these flags to handle the events at least in one
|
|
453 * active handler
|
|
454 */
|
|
455
|
|
456 revents |= POLLIN|POLLOUT;
|
|
457 }
|
|
458
|
0
|
459 found = 0;
|
|
460
|
32
|
461 if (revents & POLLIN) {
|
0
|
462 found = 1;
|
|
463
|
|
464 ev = c->read;
|
|
465 ev->ready = 1;
|
|
466
|
|
467 if (ev->oneshot) {
|
|
468 if (ev->timer_set) {
|
|
469 ngx_del_timer(ev);
|
|
470 }
|
|
471 ngx_poll_del_event(ev, NGX_READ_EVENT, 0);
|
|
472 }
|
|
473
|
|
474 if (ev->accept) {
|
|
475 ev->next = accept_events;
|
|
476 accept_events = ev;
|
|
477 } else {
|
|
478 ngx_post_event(ev);
|
|
479 }
|
|
480
|
|
481 #if 0
|
|
482 ready_index[nready++] = c->read;
|
|
483 #endif
|
|
484 }
|
|
485
|
32
|
486 if (revents & POLLOUT) {
|
0
|
487 found = 1;
|
|
488 ev = c->write;
|
|
489 ev->ready = 1;
|
|
490
|
|
491 if (ev->oneshot) {
|
|
492 if (ev->timer_set) {
|
|
493 ngx_del_timer(ev);
|
|
494 }
|
|
495 ngx_poll_del_event(ev, NGX_WRITE_EVENT, 0);
|
|
496 }
|
|
497
|
|
498 ngx_post_event(ev);
|
|
499 #if 0
|
|
500 ready_index[nready++] = c->write;
|
|
501 #endif
|
|
502 }
|
|
503
|
|
504 if (found) {
|
|
505 ready--;
|
|
506 continue;
|
|
507 }
|
|
508 }
|
|
509
|
|
510 #if 0
|
|
511 for (i = 0; i < nready; i++) {
|
|
512 ev = ready_index[i];
|
|
513
|
|
514 if (!ev->active) {
|
|
515 continue;
|
|
516 }
|
|
517
|
|
518 ev->ready = 1;
|
|
519
|
|
520 if (ev->oneshot) {
|
|
521 if (ev->timer_set) {
|
|
522 ngx_del_timer(ev);
|
|
523 }
|
|
524
|
|
525 if (ev->write) {
|
|
526 ngx_poll_del_event(ev, NGX_WRITE_EVENT, 0);
|
|
527 } else {
|
|
528 ngx_poll_del_event(ev, NGX_READ_EVENT, 0);
|
|
529 }
|
|
530 }
|
|
531
|
|
532 ev->event_handler(ev);
|
|
533 }
|
|
534 #endif
|
|
535
|
|
536 ev = accept_events;
|
|
537
|
|
538 for ( ;; ) {
|
|
539
|
|
540 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
10
|
541 "accept event %p", ev);
|
0
|
542
|
|
543 if (ev == NULL) {
|
|
544 break;
|
|
545 }
|
|
546
|
|
547 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
548
|
|
549 ev->event_handler(ev);
|
|
550
|
|
551 if (ngx_accept_disabled > 0) {
|
|
552 lock = 0;
|
|
553 break;
|
|
554 }
|
|
555
|
|
556 ev = ev->next;
|
|
557
|
|
558 if (ev == NULL) {
|
|
559 lock = 0;
|
|
560 break;
|
|
561 }
|
|
562
|
|
563 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
564 ngx_accept_mutex_unlock();
|
|
565 return NGX_ERROR;
|
|
566 }
|
|
567
|
|
568 }
|
|
569
|
|
570 ngx_accept_mutex_unlock();
|
|
571 accept_events = NULL;
|
|
572
|
|
573 if (lock) {
|
|
574 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
575 }
|
|
576
|
|
577 if (ready != 0) {
|
|
578 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "poll ready != events");
|
|
579 }
|
|
580
|
|
581 if (expire && delta) {
|
|
582 ngx_event_expire_timers((ngx_msec_t) delta);
|
|
583 }
|
|
584
|
|
585 if (!ngx_threaded) {
|
|
586 ngx_event_process_posted(cycle);
|
|
587 }
|
|
588
|
|
589 return nready;
|
|
590 }
|
|
591
|
|
592
|
|
593 static char *ngx_poll_init_conf(ngx_cycle_t *cycle, void *conf)
|
|
594 {
|
|
595 ngx_event_conf_t *ecf;
|
|
596
|
|
597 ecf = ngx_event_get_conf(cycle->conf_ctx, ngx_event_core_module);
|
|
598
|
|
599 if (ecf->use != ngx_poll_module.ctx_index) {
|
|
600 return NGX_CONF_OK;
|
|
601 }
|
|
602
|
|
603 #if (NGX_THREADS)
|
|
604
|
|
605 ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
|
|
606 "poll() is not supported in the threaded mode");
|
|
607 return NGX_CONF_ERROR;
|
|
608
|
|
609 #else
|
|
610
|
|
611 return NGX_CONF_OK;
|
|
612
|
|
613 #endif
|
|
614 }
|