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 = {
|
58
|
53 NGX_MODULE_V1,
|
0
|
54 &ngx_poll_module_ctx, /* module context */
|
|
55 NULL, /* module directives */
|
|
56 NGX_EVENT_MODULE, /* module type */
|
90
|
57 NULL, /* init master */
|
0
|
58 NULL, /* init module */
|
90
|
59 NULL, /* init process */
|
|
60 NULL, /* init thread */
|
|
61 NULL, /* exit thread */
|
|
62 NULL, /* exit process */
|
|
63 NULL, /* exit master */
|
|
64 NGX_MODULE_V1_PADDING
|
0
|
65 };
|
|
66
|
|
67
|
|
68
|
48
|
69 static ngx_int_t
|
|
70 ngx_poll_init(ngx_cycle_t *cycle)
|
0
|
71 {
|
|
72 struct pollfd *list;
|
|
73
|
|
74 if (event_list == NULL) {
|
|
75 nevents = 0;
|
|
76 }
|
|
77
|
|
78 if (ngx_process == NGX_PROCESS_WORKER
|
|
79 || cycle->old_cycle == NULL
|
|
80 || cycle->old_cycle->connection_n < cycle->connection_n)
|
|
81 {
|
50
|
82 list = ngx_alloc(sizeof(struct pollfd) * cycle->connection_n,
|
|
83 cycle->log);
|
|
84 if (list == NULL) {
|
|
85 return NGX_ERROR;
|
|
86 }
|
0
|
87
|
|
88 if (event_list) {
|
|
89 ngx_memcpy(list, event_list, sizeof(ngx_event_t *) * nevents);
|
|
90 ngx_free(event_list);
|
|
91 }
|
|
92
|
|
93 event_list = list;
|
|
94
|
|
95 #if 0
|
|
96 if (ready_index) {
|
|
97 ngx_free(ready_index);
|
|
98 }
|
|
99
|
50
|
100 ready_index = ngx_alloc(sizeof(ngx_event_t *) * 2 * cycle->connection_n,
|
|
101 cycle->log);
|
|
102 if (ready_index == NULL) {
|
|
103 return NGX_ERROR;
|
|
104 }
|
0
|
105 #endif
|
|
106 }
|
|
107
|
|
108 ngx_io = ngx_os_io;
|
|
109
|
|
110 ngx_event_actions = ngx_poll_module_ctx.actions;
|
|
111
|
|
112 ngx_event_flags = NGX_USE_LEVEL_EVENT|NGX_USE_ONESHOT_EVENT;
|
|
113
|
|
114 return NGX_OK;
|
|
115 }
|
|
116
|
|
117
|
48
|
118 static void
|
|
119 ngx_poll_done(ngx_cycle_t *cycle)
|
0
|
120 {
|
|
121 ngx_free(event_list);
|
|
122 #if 0
|
|
123 ngx_free(ready_index);
|
|
124 #endif
|
|
125
|
|
126 event_list = NULL;
|
|
127 #if 0
|
|
128 ready_index = NULL;
|
|
129 #endif
|
|
130 }
|
|
131
|
|
132
|
48
|
133 static ngx_int_t
|
|
134 ngx_poll_add_event(ngx_event_t *ev, int event, u_int flags)
|
0
|
135 {
|
|
136 ngx_event_t *e;
|
|
137 ngx_connection_t *c;
|
|
138
|
|
139 c = ev->data;
|
|
140
|
|
141 ev->active = 1;
|
|
142
|
|
143 if (ev->index != NGX_INVALID_INDEX) {
|
|
144 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
|
|
145 "poll event fd:%d ev:%d is already set", c->fd, event);
|
|
146 return NGX_OK;
|
|
147 }
|
|
148
|
|
149 if (event == NGX_READ_EVENT) {
|
|
150 e = c->write;
|
|
151 #if (NGX_READ_EVENT != POLLIN)
|
|
152 event = POLLIN;
|
|
153 #endif
|
|
154
|
|
155 } else {
|
|
156 e = c->read;
|
|
157 #if (NGX_WRITE_EVENT != POLLOUT)
|
|
158 event = POLLOUT;
|
|
159 #endif
|
|
160 }
|
|
161
|
|
162 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
|
|
163 "poll add event: fd:%d ev:%d", c->fd, event);
|
|
164
|
|
165 if (e == NULL || e->index == NGX_INVALID_INDEX) {
|
|
166 event_list[nevents].fd = c->fd;
|
|
167 event_list[nevents].events = event;
|
|
168 event_list[nevents].revents = 0;
|
|
169
|
|
170 ev->index = nevents;
|
|
171 nevents++;
|
|
172
|
|
173 } else {
|
|
174 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
|
|
175 "poll add index: %d", e->index);
|
|
176
|
|
177 event_list[e->index].events |= event;
|
|
178 ev->index = e->index;
|
|
179 }
|
|
180
|
|
181 ev->oneshot = (flags & NGX_ONESHOT_EVENT) ? 1 : 0;
|
|
182
|
|
183 return NGX_OK;
|
|
184 }
|
|
185
|
|
186
|
48
|
187 static ngx_int_t
|
|
188 ngx_poll_del_event(ngx_event_t *ev, int event, u_int flags)
|
0
|
189 {
|
|
190 ngx_uint_t i;
|
|
191 ngx_cycle_t **cycle;
|
|
192 ngx_event_t *e;
|
|
193 ngx_connection_t *c;
|
|
194
|
|
195 c = ev->data;
|
|
196
|
|
197 ev->active = 0;
|
|
198
|
|
199 if (ev->index == NGX_INVALID_INDEX) {
|
|
200 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
|
|
201 "poll event fd:%d ev:%d is already deleted",
|
|
202 c->fd, event);
|
|
203 return NGX_OK;
|
|
204 }
|
|
205
|
|
206 if (event == NGX_READ_EVENT) {
|
|
207 e = c->write;
|
|
208 #if (NGX_READ_EVENT != POLLIN)
|
|
209 event = POLLIN;
|
|
210 #endif
|
|
211
|
|
212 } else {
|
|
213 e = c->read;
|
|
214 #if (NGX_WRITE_EVENT != POLLOUT)
|
|
215 event = POLLOUT;
|
|
216 #endif
|
|
217 }
|
|
218
|
|
219 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
|
|
220 "poll del event: fd:%d ev:%d", c->fd, event);
|
|
221
|
|
222 if (e == NULL || e->index == NGX_INVALID_INDEX) {
|
|
223 nevents--;
|
|
224
|
|
225 if (ev->index < (u_int) nevents) {
|
|
226
|
|
227 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
|
|
228 "index: copy event %d to %d", nevents, ev->index);
|
|
229
|
|
230 event_list[ev->index] = event_list[nevents];
|
|
231
|
|
232 c = &ngx_cycle->connections[event_list[nevents].fd];
|
|
233
|
|
234 if (c->fd == -1) {
|
|
235 cycle = ngx_old_cycles.elts;
|
|
236 for (i = 0; i < ngx_old_cycles.nelts; i++) {
|
|
237 if (cycle[i] == NULL) {
|
|
238 continue;
|
|
239 }
|
|
240 c = &cycle[i]->connections[event_list[nevents].fd];
|
|
241 if (c->fd != -1) {
|
|
242 break;
|
|
243 }
|
|
244 }
|
|
245 }
|
|
246
|
|
247 if (c->fd == -1) {
|
|
248 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
|
|
249 "unexpected last event");
|
|
250
|
|
251 } else {
|
|
252 if (c->read->index == (u_int) nevents) {
|
|
253 c->read->index = ev->index;
|
|
254 }
|
|
255
|
|
256 if (c->write->index == (u_int) nevents) {
|
|
257 c->write->index = ev->index;
|
|
258 }
|
|
259 }
|
|
260 }
|
|
261
|
|
262 } else {
|
|
263 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
|
|
264 "poll del index: %d", e->index);
|
|
265
|
|
266 event_list[e->index].events &= ~event;
|
|
267 }
|
|
268
|
|
269 ev->index = NGX_INVALID_INDEX;
|
|
270
|
|
271 return NGX_OK;
|
|
272 }
|
|
273
|
|
274
|
48
|
275 static ngx_int_t
|
|
276 ngx_poll_process_events(ngx_cycle_t *cycle)
|
0
|
277 {
|
32
|
278 int ready, revents;
|
0
|
279 ngx_int_t i, nready;
|
|
280 ngx_uint_t n, found, lock, expire;
|
|
281 ngx_msec_t timer;
|
|
282 ngx_err_t err;
|
|
283 ngx_cycle_t **old_cycle;
|
|
284 ngx_event_t *ev;
|
|
285 ngx_epoch_msec_t delta;
|
|
286 ngx_connection_t *c;
|
|
287 struct timeval tv;
|
|
288
|
|
289 for ( ;; ) {
|
|
290 timer = ngx_event_find_timer();
|
|
291
|
|
292 if (timer != 0) {
|
|
293 break;
|
|
294 }
|
|
295
|
|
296 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
297 "poll expired timer");
|
|
298
|
|
299 ngx_event_expire_timers((ngx_msec_t)
|
|
300 (ngx_elapsed_msec - ngx_old_elapsed_msec));
|
|
301 }
|
|
302
|
|
303 /* NGX_TIMER_INFINITE == INFTIM */
|
|
304
|
|
305 if (timer == NGX_TIMER_INFINITE) {
|
|
306 expire = 0;
|
|
307
|
|
308 } else {
|
|
309 expire = 1;
|
|
310 }
|
|
311
|
|
312 ngx_old_elapsed_msec = ngx_elapsed_msec;
|
|
313
|
|
314 #if (NGX_DEBUG0)
|
|
315 if (cycle->log->log_level & NGX_LOG_DEBUG_ALL) {
|
|
316 for (i = 0; i < nevents; i++) {
|
|
317 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
10
|
318 "poll: %d: fd:%d ev:%04Xd",
|
0
|
319 i, event_list[i].fd, event_list[i].events);
|
|
320 }
|
|
321 }
|
|
322 #endif
|
|
323
|
|
324 if (ngx_accept_mutex) {
|
|
325 if (ngx_accept_disabled > 0) {
|
|
326 ngx_accept_disabled--;
|
|
327
|
|
328 } else {
|
|
329 if (ngx_trylock_accept_mutex(cycle) == NGX_ERROR) {
|
|
330 return NGX_ERROR;
|
|
331 }
|
|
332
|
|
333 if (ngx_accept_mutex_held == 0
|
|
334 && (timer == NGX_TIMER_INFINITE
|
|
335 || timer > ngx_accept_mutex_delay))
|
|
336 {
|
|
337 timer = ngx_accept_mutex_delay;
|
|
338 expire = 0;
|
|
339 }
|
|
340 }
|
|
341 }
|
|
342
|
|
343 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "poll timer: %d", timer);
|
|
344
|
|
345 ready = poll(event_list, (u_int) nevents, (int) timer);
|
|
346
|
|
347 if (ready == -1) {
|
|
348 err = ngx_errno;
|
|
349 } else {
|
|
350 err = 0;
|
|
351 }
|
|
352
|
|
353 ngx_gettimeofday(&tv);
|
|
354 ngx_time_update(tv.tv_sec);
|
|
355
|
|
356 delta = ngx_elapsed_msec;
|
|
357 ngx_elapsed_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000
|
|
358 + tv.tv_usec / 1000 - ngx_start_msec;
|
|
359
|
|
360 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
361 "poll ready %d of %d", ready, nevents);
|
|
362
|
|
363 if (err) {
|
|
364 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
|
|
365 cycle->log, err, "poll() failed");
|
|
366 ngx_accept_mutex_unlock();
|
|
367 return NGX_ERROR;
|
|
368 }
|
|
369
|
|
370 if (timer != NGX_TIMER_INFINITE) {
|
|
371 delta = ngx_elapsed_msec - delta;
|
|
372
|
|
373 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
374 "poll timer: %d, delta: %d", timer, (int) delta);
|
|
375 } else {
|
|
376 if (ready == 0) {
|
|
377 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
378 "poll() returned no events without timeout");
|
|
379 ngx_accept_mutex_unlock();
|
|
380 return NGX_ERROR;
|
|
381 }
|
|
382 }
|
|
383
|
|
384 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
385 ngx_accept_mutex_unlock();
|
|
386 return NGX_ERROR;
|
|
387 }
|
|
388
|
|
389 lock = 1;
|
|
390 nready = 0;
|
|
391
|
|
392 for (i = 0; i < nevents && ready; i++) {
|
|
393
|
32
|
394 revents = event_list[i].revents;
|
|
395
|
0
|
396 #if 0
|
|
397 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
10
|
398 "poll: %d: fd:%d ev:%04Xd rev:%04Xd",
|
32
|
399 i, event_list[i].fd, event_list[i].events, revents);
|
0
|
400 #else
|
32
|
401 if (revents) {
|
0
|
402 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
10
|
403 "poll: %d: fd:%d ev:%04Xd rev:%04Xd",
|
32
|
404 i, event_list[i].fd, event_list[i].events, revents);
|
0
|
405 }
|
|
406 #endif
|
|
407
|
32
|
408 if (revents & POLLNVAL) {
|
0
|
409 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
10
|
410 "poll() error fd:%d ev:%04Xd rev:%04Xd",
|
32
|
411 event_list[i].fd, event_list[i].events, revents);
|
0
|
412 }
|
|
413
|
32
|
414 if (revents & ~(POLLIN|POLLOUT|POLLERR|POLLHUP|POLLNVAL)) {
|
0
|
415 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
10
|
416 "strange poll() events fd:%d ev:%04Xd rev:%04Xd",
|
32
|
417 event_list[i].fd, event_list[i].events, revents);
|
0
|
418 }
|
|
419
|
|
420 if (event_list[i].fd == -1) {
|
|
421 /*
|
|
422 * the disabled event, a workaround for our possible bug,
|
|
423 * see the comment below
|
|
424 */
|
|
425 continue;
|
|
426 }
|
|
427
|
|
428 c = &ngx_cycle->connections[event_list[i].fd];
|
|
429
|
|
430 if (c->fd == -1) {
|
|
431 old_cycle = ngx_old_cycles.elts;
|
|
432 for (n = 0; n < ngx_old_cycles.nelts; n++) {
|
|
433 if (old_cycle[n] == NULL) {
|
|
434 continue;
|
|
435 }
|
|
436 c = &old_cycle[n]->connections[event_list[i].fd];
|
|
437 if (c->fd != -1) {
|
|
438 break;
|
|
439 }
|
|
440 }
|
|
441 }
|
|
442
|
|
443 if (c->fd == -1) {
|
|
444 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "unexpected event");
|
|
445
|
|
446 /*
|
|
447 * it is certainly our fault and it should be investigated,
|
|
448 * in the meantime we disable this event to avoid a CPU spinning
|
|
449 */
|
|
450
|
|
451 if (i == nevents - 1) {
|
|
452 nevents--;
|
|
453 } else {
|
|
454 event_list[i].fd = -1;
|
|
455 }
|
|
456
|
|
457 continue;
|
|
458 }
|
|
459
|
32
|
460 if ((revents & (POLLERR|POLLHUP|POLLNVAL))
|
|
461 && (revents & (POLLIN|POLLOUT)) == 0)
|
|
462 {
|
|
463 /*
|
|
464 * if the error events were returned without POLLIN or POLLOUT,
|
|
465 * then add these flags to handle the events at least in one
|
|
466 * active handler
|
|
467 */
|
|
468
|
|
469 revents |= POLLIN|POLLOUT;
|
|
470 }
|
|
471
|
0
|
472 found = 0;
|
|
473
|
32
|
474 if (revents & POLLIN) {
|
0
|
475 found = 1;
|
|
476
|
|
477 ev = c->read;
|
|
478 ev->ready = 1;
|
|
479
|
|
480 if (ev->oneshot) {
|
|
481 if (ev->timer_set) {
|
|
482 ngx_del_timer(ev);
|
|
483 }
|
|
484 ngx_poll_del_event(ev, NGX_READ_EVENT, 0);
|
|
485 }
|
|
486
|
|
487 if (ev->accept) {
|
|
488 ev->next = accept_events;
|
|
489 accept_events = ev;
|
|
490 } else {
|
|
491 ngx_post_event(ev);
|
|
492 }
|
|
493
|
|
494 #if 0
|
|
495 ready_index[nready++] = c->read;
|
|
496 #endif
|
|
497 }
|
|
498
|
32
|
499 if (revents & POLLOUT) {
|
0
|
500 found = 1;
|
|
501 ev = c->write;
|
|
502 ev->ready = 1;
|
|
503
|
|
504 if (ev->oneshot) {
|
|
505 if (ev->timer_set) {
|
|
506 ngx_del_timer(ev);
|
|
507 }
|
|
508 ngx_poll_del_event(ev, NGX_WRITE_EVENT, 0);
|
|
509 }
|
|
510
|
|
511 ngx_post_event(ev);
|
|
512 #if 0
|
|
513 ready_index[nready++] = c->write;
|
|
514 #endif
|
|
515 }
|
|
516
|
|
517 if (found) {
|
|
518 ready--;
|
|
519 continue;
|
|
520 }
|
|
521 }
|
|
522
|
|
523 #if 0
|
|
524 for (i = 0; i < nready; i++) {
|
|
525 ev = ready_index[i];
|
|
526
|
|
527 if (!ev->active) {
|
|
528 continue;
|
|
529 }
|
|
530
|
|
531 ev->ready = 1;
|
|
532
|
|
533 if (ev->oneshot) {
|
|
534 if (ev->timer_set) {
|
|
535 ngx_del_timer(ev);
|
|
536 }
|
|
537
|
|
538 if (ev->write) {
|
|
539 ngx_poll_del_event(ev, NGX_WRITE_EVENT, 0);
|
|
540 } else {
|
|
541 ngx_poll_del_event(ev, NGX_READ_EVENT, 0);
|
|
542 }
|
|
543 }
|
|
544
|
58
|
545 ev->handler(ev);
|
0
|
546 }
|
|
547 #endif
|
|
548
|
|
549 ev = accept_events;
|
|
550
|
|
551 for ( ;; ) {
|
|
552
|
|
553 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
10
|
554 "accept event %p", ev);
|
0
|
555
|
|
556 if (ev == NULL) {
|
|
557 break;
|
|
558 }
|
|
559
|
|
560 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
561
|
58
|
562 ev->handler(ev);
|
0
|
563
|
|
564 if (ngx_accept_disabled > 0) {
|
|
565 lock = 0;
|
|
566 break;
|
|
567 }
|
|
568
|
|
569 ev = ev->next;
|
|
570
|
|
571 if (ev == NULL) {
|
|
572 lock = 0;
|
|
573 break;
|
|
574 }
|
|
575
|
|
576 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
577 ngx_accept_mutex_unlock();
|
|
578 return NGX_ERROR;
|
|
579 }
|
|
580
|
|
581 }
|
|
582
|
|
583 ngx_accept_mutex_unlock();
|
|
584 accept_events = NULL;
|
|
585
|
|
586 if (lock) {
|
|
587 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
588 }
|
|
589
|
|
590 if (ready != 0) {
|
|
591 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "poll ready != events");
|
|
592 }
|
|
593
|
|
594 if (expire && delta) {
|
|
595 ngx_event_expire_timers((ngx_msec_t) delta);
|
|
596 }
|
|
597
|
|
598 if (!ngx_threaded) {
|
|
599 ngx_event_process_posted(cycle);
|
|
600 }
|
|
601
|
|
602 return nready;
|
|
603 }
|
|
604
|
|
605
|
48
|
606 static char *
|
|
607 ngx_poll_init_conf(ngx_cycle_t *cycle, void *conf)
|
0
|
608 {
|
|
609 ngx_event_conf_t *ecf;
|
|
610
|
|
611 ecf = ngx_event_get_conf(cycle->conf_ctx, ngx_event_core_module);
|
|
612
|
|
613 if (ecf->use != ngx_poll_module.ctx_index) {
|
|
614 return NGX_CONF_OK;
|
|
615 }
|
|
616
|
|
617 #if (NGX_THREADS)
|
|
618
|
|
619 ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
|
|
620 "poll() is not supported in the threaded mode");
|
|
621 return NGX_CONF_ERROR;
|
|
622
|
|
623 #else
|
|
624
|
|
625 return NGX_CONF_OK;
|
|
626
|
|
627 #endif
|
|
628 }
|