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