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
|
48
|
63 static ngx_int_t
|
|
64 ngx_poll_init(ngx_cycle_t *cycle)
|
0
|
65 {
|
|
66 struct pollfd *list;
|
|
67
|
|
68 if (event_list == NULL) {
|
|
69 nevents = 0;
|
|
70 }
|
|
71
|
|
72 if (ngx_process == NGX_PROCESS_WORKER
|
|
73 || cycle->old_cycle == NULL
|
|
74 || cycle->old_cycle->connection_n < cycle->connection_n)
|
|
75 {
|
50
|
76 list = ngx_alloc(sizeof(struct pollfd) * cycle->connection_n,
|
|
77 cycle->log);
|
|
78 if (list == NULL) {
|
|
79 return NGX_ERROR;
|
|
80 }
|
0
|
81
|
|
82 if (event_list) {
|
|
83 ngx_memcpy(list, event_list, sizeof(ngx_event_t *) * nevents);
|
|
84 ngx_free(event_list);
|
|
85 }
|
|
86
|
|
87 event_list = list;
|
|
88
|
|
89 #if 0
|
|
90 if (ready_index) {
|
|
91 ngx_free(ready_index);
|
|
92 }
|
|
93
|
50
|
94 ready_index = ngx_alloc(sizeof(ngx_event_t *) * 2 * cycle->connection_n,
|
|
95 cycle->log);
|
|
96 if (ready_index == NULL) {
|
|
97 return NGX_ERROR;
|
|
98 }
|
0
|
99 #endif
|
|
100 }
|
|
101
|
|
102 ngx_io = ngx_os_io;
|
|
103
|
|
104 ngx_event_actions = ngx_poll_module_ctx.actions;
|
|
105
|
|
106 ngx_event_flags = NGX_USE_LEVEL_EVENT|NGX_USE_ONESHOT_EVENT;
|
|
107
|
|
108 return NGX_OK;
|
|
109 }
|
|
110
|
|
111
|
48
|
112 static void
|
|
113 ngx_poll_done(ngx_cycle_t *cycle)
|
0
|
114 {
|
|
115 ngx_free(event_list);
|
|
116 #if 0
|
|
117 ngx_free(ready_index);
|
|
118 #endif
|
|
119
|
|
120 event_list = NULL;
|
|
121 #if 0
|
|
122 ready_index = NULL;
|
|
123 #endif
|
|
124 }
|
|
125
|
|
126
|
48
|
127 static ngx_int_t
|
|
128 ngx_poll_add_event(ngx_event_t *ev, int event, u_int flags)
|
0
|
129 {
|
|
130 ngx_event_t *e;
|
|
131 ngx_connection_t *c;
|
|
132
|
|
133 c = ev->data;
|
|
134
|
|
135 ev->active = 1;
|
|
136
|
|
137 if (ev->index != NGX_INVALID_INDEX) {
|
|
138 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
|
|
139 "poll event fd:%d ev:%d is already set", c->fd, event);
|
|
140 return NGX_OK;
|
|
141 }
|
|
142
|
|
143 if (event == NGX_READ_EVENT) {
|
|
144 e = c->write;
|
|
145 #if (NGX_READ_EVENT != POLLIN)
|
|
146 event = POLLIN;
|
|
147 #endif
|
|
148
|
|
149 } else {
|
|
150 e = c->read;
|
|
151 #if (NGX_WRITE_EVENT != POLLOUT)
|
|
152 event = POLLOUT;
|
|
153 #endif
|
|
154 }
|
|
155
|
|
156 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
|
|
157 "poll add event: fd:%d ev:%d", c->fd, event);
|
|
158
|
|
159 if (e == NULL || e->index == NGX_INVALID_INDEX) {
|
|
160 event_list[nevents].fd = c->fd;
|
|
161 event_list[nevents].events = event;
|
|
162 event_list[nevents].revents = 0;
|
|
163
|
|
164 ev->index = nevents;
|
|
165 nevents++;
|
|
166
|
|
167 } else {
|
|
168 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
|
|
169 "poll add index: %d", e->index);
|
|
170
|
|
171 event_list[e->index].events |= event;
|
|
172 ev->index = e->index;
|
|
173 }
|
|
174
|
|
175 ev->oneshot = (flags & NGX_ONESHOT_EVENT) ? 1 : 0;
|
|
176
|
|
177 return NGX_OK;
|
|
178 }
|
|
179
|
|
180
|
48
|
181 static ngx_int_t
|
|
182 ngx_poll_del_event(ngx_event_t *ev, int event, u_int flags)
|
0
|
183 {
|
|
184 ngx_uint_t i;
|
|
185 ngx_cycle_t **cycle;
|
|
186 ngx_event_t *e;
|
|
187 ngx_connection_t *c;
|
|
188
|
|
189 c = ev->data;
|
|
190
|
|
191 ev->active = 0;
|
|
192
|
|
193 if (ev->index == NGX_INVALID_INDEX) {
|
|
194 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
|
|
195 "poll event fd:%d ev:%d is already deleted",
|
|
196 c->fd, event);
|
|
197 return NGX_OK;
|
|
198 }
|
|
199
|
|
200 if (event == NGX_READ_EVENT) {
|
|
201 e = c->write;
|
|
202 #if (NGX_READ_EVENT != POLLIN)
|
|
203 event = POLLIN;
|
|
204 #endif
|
|
205
|
|
206 } else {
|
|
207 e = c->read;
|
|
208 #if (NGX_WRITE_EVENT != POLLOUT)
|
|
209 event = POLLOUT;
|
|
210 #endif
|
|
211 }
|
|
212
|
|
213 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
|
|
214 "poll del event: fd:%d ev:%d", c->fd, event);
|
|
215
|
|
216 if (e == NULL || e->index == NGX_INVALID_INDEX) {
|
|
217 nevents--;
|
|
218
|
|
219 if (ev->index < (u_int) nevents) {
|
|
220
|
|
221 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
|
|
222 "index: copy event %d to %d", nevents, ev->index);
|
|
223
|
|
224 event_list[ev->index] = event_list[nevents];
|
|
225
|
|
226 c = &ngx_cycle->connections[event_list[nevents].fd];
|
|
227
|
|
228 if (c->fd == -1) {
|
|
229 cycle = ngx_old_cycles.elts;
|
|
230 for (i = 0; i < ngx_old_cycles.nelts; i++) {
|
|
231 if (cycle[i] == NULL) {
|
|
232 continue;
|
|
233 }
|
|
234 c = &cycle[i]->connections[event_list[nevents].fd];
|
|
235 if (c->fd != -1) {
|
|
236 break;
|
|
237 }
|
|
238 }
|
|
239 }
|
|
240
|
|
241 if (c->fd == -1) {
|
|
242 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
|
|
243 "unexpected last event");
|
|
244
|
|
245 } else {
|
|
246 if (c->read->index == (u_int) nevents) {
|
|
247 c->read->index = ev->index;
|
|
248 }
|
|
249
|
|
250 if (c->write->index == (u_int) nevents) {
|
|
251 c->write->index = ev->index;
|
|
252 }
|
|
253 }
|
|
254 }
|
|
255
|
|
256 } else {
|
|
257 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
|
|
258 "poll del index: %d", e->index);
|
|
259
|
|
260 event_list[e->index].events &= ~event;
|
|
261 }
|
|
262
|
|
263 ev->index = NGX_INVALID_INDEX;
|
|
264
|
|
265 return NGX_OK;
|
|
266 }
|
|
267
|
|
268
|
48
|
269 static ngx_int_t
|
|
270 ngx_poll_process_events(ngx_cycle_t *cycle)
|
0
|
271 {
|
32
|
272 int ready, revents;
|
0
|
273 ngx_int_t i, nready;
|
|
274 ngx_uint_t n, found, lock, expire;
|
|
275 ngx_msec_t timer;
|
|
276 ngx_err_t err;
|
|
277 ngx_cycle_t **old_cycle;
|
|
278 ngx_event_t *ev;
|
|
279 ngx_epoch_msec_t delta;
|
|
280 ngx_connection_t *c;
|
|
281 struct timeval tv;
|
|
282
|
|
283 for ( ;; ) {
|
|
284 timer = ngx_event_find_timer();
|
|
285
|
|
286 if (timer != 0) {
|
|
287 break;
|
|
288 }
|
|
289
|
|
290 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
291 "poll expired timer");
|
|
292
|
|
293 ngx_event_expire_timers((ngx_msec_t)
|
|
294 (ngx_elapsed_msec - ngx_old_elapsed_msec));
|
|
295 }
|
|
296
|
|
297 /* NGX_TIMER_INFINITE == INFTIM */
|
|
298
|
|
299 if (timer == NGX_TIMER_INFINITE) {
|
|
300 expire = 0;
|
|
301
|
|
302 } else {
|
|
303 expire = 1;
|
|
304 }
|
|
305
|
|
306 ngx_old_elapsed_msec = ngx_elapsed_msec;
|
|
307
|
|
308 #if (NGX_DEBUG0)
|
|
309 if (cycle->log->log_level & NGX_LOG_DEBUG_ALL) {
|
|
310 for (i = 0; i < nevents; i++) {
|
|
311 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
10
|
312 "poll: %d: fd:%d ev:%04Xd",
|
0
|
313 i, event_list[i].fd, event_list[i].events);
|
|
314 }
|
|
315 }
|
|
316 #endif
|
|
317
|
|
318 if (ngx_accept_mutex) {
|
|
319 if (ngx_accept_disabled > 0) {
|
|
320 ngx_accept_disabled--;
|
|
321
|
|
322 } else {
|
|
323 if (ngx_trylock_accept_mutex(cycle) == NGX_ERROR) {
|
|
324 return NGX_ERROR;
|
|
325 }
|
|
326
|
|
327 if (ngx_accept_mutex_held == 0
|
|
328 && (timer == NGX_TIMER_INFINITE
|
|
329 || timer > ngx_accept_mutex_delay))
|
|
330 {
|
|
331 timer = ngx_accept_mutex_delay;
|
|
332 expire = 0;
|
|
333 }
|
|
334 }
|
|
335 }
|
|
336
|
|
337 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "poll timer: %d", timer);
|
|
338
|
|
339 ready = poll(event_list, (u_int) nevents, (int) timer);
|
|
340
|
|
341 if (ready == -1) {
|
|
342 err = ngx_errno;
|
|
343 } else {
|
|
344 err = 0;
|
|
345 }
|
|
346
|
|
347 ngx_gettimeofday(&tv);
|
|
348 ngx_time_update(tv.tv_sec);
|
|
349
|
|
350 delta = ngx_elapsed_msec;
|
|
351 ngx_elapsed_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000
|
|
352 + tv.tv_usec / 1000 - ngx_start_msec;
|
|
353
|
|
354 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
355 "poll ready %d of %d", ready, nevents);
|
|
356
|
|
357 if (err) {
|
|
358 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
|
|
359 cycle->log, err, "poll() failed");
|
|
360 ngx_accept_mutex_unlock();
|
|
361 return NGX_ERROR;
|
|
362 }
|
|
363
|
|
364 if (timer != NGX_TIMER_INFINITE) {
|
|
365 delta = ngx_elapsed_msec - delta;
|
|
366
|
|
367 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
368 "poll timer: %d, delta: %d", timer, (int) delta);
|
|
369 } else {
|
|
370 if (ready == 0) {
|
|
371 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
372 "poll() returned no events without timeout");
|
|
373 ngx_accept_mutex_unlock();
|
|
374 return NGX_ERROR;
|
|
375 }
|
|
376 }
|
|
377
|
|
378 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
379 ngx_accept_mutex_unlock();
|
|
380 return NGX_ERROR;
|
|
381 }
|
|
382
|
|
383 lock = 1;
|
|
384 nready = 0;
|
|
385
|
|
386 for (i = 0; i < nevents && ready; i++) {
|
|
387
|
32
|
388 revents = event_list[i].revents;
|
|
389
|
0
|
390 #if 0
|
|
391 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
10
|
392 "poll: %d: fd:%d ev:%04Xd rev:%04Xd",
|
32
|
393 i, event_list[i].fd, event_list[i].events, revents);
|
0
|
394 #else
|
32
|
395 if (revents) {
|
0
|
396 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
10
|
397 "poll: %d: fd:%d ev:%04Xd rev:%04Xd",
|
32
|
398 i, event_list[i].fd, event_list[i].events, revents);
|
0
|
399 }
|
|
400 #endif
|
|
401
|
32
|
402 if (revents & POLLNVAL) {
|
0
|
403 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
10
|
404 "poll() error fd:%d ev:%04Xd rev:%04Xd",
|
32
|
405 event_list[i].fd, event_list[i].events, revents);
|
0
|
406 }
|
|
407
|
32
|
408 if (revents & ~(POLLIN|POLLOUT|POLLERR|POLLHUP|POLLNVAL)) {
|
0
|
409 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
10
|
410 "strange poll() events fd:%d ev:%04Xd rev:%04Xd",
|
32
|
411 event_list[i].fd, event_list[i].events, revents);
|
0
|
412 }
|
|
413
|
|
414 if (event_list[i].fd == -1) {
|
|
415 /*
|
|
416 * the disabled event, a workaround for our possible bug,
|
|
417 * see the comment below
|
|
418 */
|
|
419 continue;
|
|
420 }
|
|
421
|
|
422 c = &ngx_cycle->connections[event_list[i].fd];
|
|
423
|
|
424 if (c->fd == -1) {
|
|
425 old_cycle = ngx_old_cycles.elts;
|
|
426 for (n = 0; n < ngx_old_cycles.nelts; n++) {
|
|
427 if (old_cycle[n] == NULL) {
|
|
428 continue;
|
|
429 }
|
|
430 c = &old_cycle[n]->connections[event_list[i].fd];
|
|
431 if (c->fd != -1) {
|
|
432 break;
|
|
433 }
|
|
434 }
|
|
435 }
|
|
436
|
|
437 if (c->fd == -1) {
|
|
438 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "unexpected event");
|
|
439
|
|
440 /*
|
|
441 * it is certainly our fault and it should be investigated,
|
|
442 * in the meantime we disable this event to avoid a CPU spinning
|
|
443 */
|
|
444
|
|
445 if (i == nevents - 1) {
|
|
446 nevents--;
|
|
447 } else {
|
|
448 event_list[i].fd = -1;
|
|
449 }
|
|
450
|
|
451 continue;
|
|
452 }
|
|
453
|
32
|
454 if ((revents & (POLLERR|POLLHUP|POLLNVAL))
|
|
455 && (revents & (POLLIN|POLLOUT)) == 0)
|
|
456 {
|
|
457 /*
|
|
458 * if the error events were returned without POLLIN or POLLOUT,
|
|
459 * then add these flags to handle the events at least in one
|
|
460 * active handler
|
|
461 */
|
|
462
|
|
463 revents |= POLLIN|POLLOUT;
|
|
464 }
|
|
465
|
0
|
466 found = 0;
|
|
467
|
32
|
468 if (revents & POLLIN) {
|
0
|
469 found = 1;
|
|
470
|
|
471 ev = c->read;
|
|
472 ev->ready = 1;
|
|
473
|
|
474 if (ev->oneshot) {
|
|
475 if (ev->timer_set) {
|
|
476 ngx_del_timer(ev);
|
|
477 }
|
|
478 ngx_poll_del_event(ev, NGX_READ_EVENT, 0);
|
|
479 }
|
|
480
|
|
481 if (ev->accept) {
|
|
482 ev->next = accept_events;
|
|
483 accept_events = ev;
|
|
484 } else {
|
|
485 ngx_post_event(ev);
|
|
486 }
|
|
487
|
|
488 #if 0
|
|
489 ready_index[nready++] = c->read;
|
|
490 #endif
|
|
491 }
|
|
492
|
32
|
493 if (revents & POLLOUT) {
|
0
|
494 found = 1;
|
|
495 ev = c->write;
|
|
496 ev->ready = 1;
|
|
497
|
|
498 if (ev->oneshot) {
|
|
499 if (ev->timer_set) {
|
|
500 ngx_del_timer(ev);
|
|
501 }
|
|
502 ngx_poll_del_event(ev, NGX_WRITE_EVENT, 0);
|
|
503 }
|
|
504
|
|
505 ngx_post_event(ev);
|
|
506 #if 0
|
|
507 ready_index[nready++] = c->write;
|
|
508 #endif
|
|
509 }
|
|
510
|
|
511 if (found) {
|
|
512 ready--;
|
|
513 continue;
|
|
514 }
|
|
515 }
|
|
516
|
|
517 #if 0
|
|
518 for (i = 0; i < nready; i++) {
|
|
519 ev = ready_index[i];
|
|
520
|
|
521 if (!ev->active) {
|
|
522 continue;
|
|
523 }
|
|
524
|
|
525 ev->ready = 1;
|
|
526
|
|
527 if (ev->oneshot) {
|
|
528 if (ev->timer_set) {
|
|
529 ngx_del_timer(ev);
|
|
530 }
|
|
531
|
|
532 if (ev->write) {
|
|
533 ngx_poll_del_event(ev, NGX_WRITE_EVENT, 0);
|
|
534 } else {
|
|
535 ngx_poll_del_event(ev, NGX_READ_EVENT, 0);
|
|
536 }
|
|
537 }
|
|
538
|
|
539 ev->event_handler(ev);
|
|
540 }
|
|
541 #endif
|
|
542
|
|
543 ev = accept_events;
|
|
544
|
|
545 for ( ;; ) {
|
|
546
|
|
547 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
10
|
548 "accept event %p", ev);
|
0
|
549
|
|
550 if (ev == NULL) {
|
|
551 break;
|
|
552 }
|
|
553
|
|
554 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
555
|
|
556 ev->event_handler(ev);
|
|
557
|
|
558 if (ngx_accept_disabled > 0) {
|
|
559 lock = 0;
|
|
560 break;
|
|
561 }
|
|
562
|
|
563 ev = ev->next;
|
|
564
|
|
565 if (ev == NULL) {
|
|
566 lock = 0;
|
|
567 break;
|
|
568 }
|
|
569
|
|
570 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
571 ngx_accept_mutex_unlock();
|
|
572 return NGX_ERROR;
|
|
573 }
|
|
574
|
|
575 }
|
|
576
|
|
577 ngx_accept_mutex_unlock();
|
|
578 accept_events = NULL;
|
|
579
|
|
580 if (lock) {
|
|
581 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
582 }
|
|
583
|
|
584 if (ready != 0) {
|
|
585 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "poll ready != events");
|
|
586 }
|
|
587
|
|
588 if (expire && delta) {
|
|
589 ngx_event_expire_timers((ngx_msec_t) delta);
|
|
590 }
|
|
591
|
|
592 if (!ngx_threaded) {
|
|
593 ngx_event_process_posted(cycle);
|
|
594 }
|
|
595
|
|
596 return nready;
|
|
597 }
|
|
598
|
|
599
|
48
|
600 static char *
|
|
601 ngx_poll_init_conf(ngx_cycle_t *cycle, void *conf)
|
0
|
602 {
|
|
603 ngx_event_conf_t *ecf;
|
|
604
|
|
605 ecf = ngx_event_get_conf(cycle->conf_ctx, ngx_event_core_module);
|
|
606
|
|
607 if (ecf->use != ngx_poll_module.ctx_index) {
|
|
608 return NGX_CONF_OK;
|
|
609 }
|
|
610
|
|
611 #if (NGX_THREADS)
|
|
612
|
|
613 ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
|
|
614 "poll() is not supported in the threaded mode");
|
|
615 return NGX_CONF_ERROR;
|
|
616
|
|
617 #else
|
|
618
|
|
619 return NGX_CONF_OK;
|
|
620
|
|
621 #endif
|
|
622 }
|