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comparison src/event/modules/ngx_poll_module.c @ 0:f0b350454894 NGINX_0_1_0

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nginx 0.1.0 *) The first public version.
author Igor Sysoev <http://sysoev.ru>
date Mon, 04 Oct 2004 00:00:00 +0400
parents
children 46833bd150cb
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-1:000000000000 0:f0b350454894
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 {
265 int ready;
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,
305 "poll: %d: fd:%d ev:%04X",
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
381 #if 0
382 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
383 "poll: %d: fd:%d ev:%04X rev:%04X",
384 i, event_list[i].fd,
385 event_list[i].events, event_list[i].revents);
386 #else
387 if (event_list[i].revents) {
388 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
389 "poll: %d: fd:%d ev:%04X rev:%04X",
390 i, event_list[i].fd,
391 event_list[i].events, event_list[i].revents);
392 }
393 #endif
394
395 if (event_list[i].revents & POLLNVAL) {
396 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
397 "poll() error fd:%d ev:%04X rev:%04X",
398 event_list[i].fd,
399 event_list[i].events, event_list[i].revents);
400 }
401
402 if (event_list[i].revents & ~(POLLIN|POLLOUT|POLLERR|POLLHUP|POLLNVAL))
403 {
404 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
405 "strange poll() events fd:%d ev:%04X rev:%04X",
406 event_list[i].fd,
407 event_list[i].events, event_list[i].revents);
408 }
409
410 if (event_list[i].fd == -1) {
411 /*
412 * the disabled event, a workaround for our possible bug,
413 * see the comment below
414 */
415 continue;
416 }
417
418 c = &ngx_cycle->connections[event_list[i].fd];
419
420 if (c->fd == -1) {
421 old_cycle = ngx_old_cycles.elts;
422 for (n = 0; n < ngx_old_cycles.nelts; n++) {
423 if (old_cycle[n] == NULL) {
424 continue;
425 }
426 c = &old_cycle[n]->connections[event_list[i].fd];
427 if (c->fd != -1) {
428 break;
429 }
430 }
431 }
432
433 if (c->fd == -1) {
434 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "unexpected event");
435
436 /*
437 * it is certainly our fault and it should be investigated,
438 * in the meantime we disable this event to avoid a CPU spinning
439 */
440
441 if (i == nevents - 1) {
442 nevents--;
443 } else {
444 event_list[i].fd = -1;
445 }
446
447 continue;
448 }
449
450 found = 0;
451
452 if (event_list[i].revents & (POLLIN|POLLERR|POLLHUP|POLLNVAL)) {
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
477 if (event_list[i].revents & (POLLOUT|POLLERR|POLLHUP|POLLNVAL)) {
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
523 ev->event_handler(ev);
524 }
525 #endif
526
527 ev = accept_events;
528
529 for ( ;; ) {
530
531 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
532 "accept event " PTR_FMT, ev);
533
534 if (ev == NULL) {
535 break;
536 }
537
538 ngx_mutex_unlock(ngx_posted_events_mutex);
539
540 ev->event_handler(ev);
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
572 if (expire && delta) {
573 ngx_event_expire_timers((ngx_msec_t) delta);
574 }
575
576 if (!ngx_threaded) {
577 ngx_event_process_posted(cycle);
578 }
579
580 return nready;
581 }
582
583
584 static char *ngx_poll_init_conf(ngx_cycle_t *cycle, void *conf)
585 {
586 ngx_event_conf_t *ecf;
587
588 ecf = ngx_event_get_conf(cycle->conf_ctx, ngx_event_core_module);
589
590 if (ecf->use != ngx_poll_module.ctx_index) {
591 return NGX_CONF_OK;
592 }
593
594 #if (NGX_THREADS)
595
596 ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
597 "poll() is not supported in the threaded mode");
598 return NGX_CONF_ERROR;
599
600 #else
601
602 return NGX_CONF_OK;
603
604 #endif
605 }