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comparison src/event/modules/ngx_devpoll_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
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children cc9f381affaa
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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 #if (TEST_BUILD_DEVPOLL)
13
14 /* Solaris declarations */
15
16 #define POLLREMOVE 0x0800
17 #define DP_POLL 0xD001
18
19 struct dvpoll {
20 struct pollfd *dp_fds;
21 int dp_nfds;
22 int dp_timeout;
23 };
24
25 #endif
26
27
28 typedef struct {
29 u_int changes;
30 u_int events;
31 } ngx_devpoll_conf_t;
32
33
34 static int ngx_devpoll_init(ngx_cycle_t *cycle);
35 static void ngx_devpoll_done(ngx_cycle_t *cycle);
36 static int ngx_devpoll_add_event(ngx_event_t *ev, int event, u_int flags);
37 static int ngx_devpoll_del_event(ngx_event_t *ev, int event, u_int flags);
38 static int ngx_devpoll_set_event(ngx_event_t *ev, int event, u_int flags);
39 static int ngx_devpoll_process_events(ngx_cycle_t *cycle);
40
41 static void *ngx_devpoll_create_conf(ngx_cycle_t *cycle);
42 static char *ngx_devpoll_init_conf(ngx_cycle_t *cycle, void *conf);
43
44 static int dp = -1;
45 static struct pollfd *change_list, *event_list;
46 static u_int nchanges, max_changes, nevents;
47
48 static ngx_event_t **change_index;
49
50
51 static ngx_str_t devpoll_name = ngx_string("/dev/poll");
52
53 static ngx_command_t ngx_devpoll_commands[] = {
54
55 {ngx_string("devpoll_changes"),
56 NGX_EVENT_CONF|NGX_CONF_TAKE1,
57 ngx_conf_set_num_slot,
58 0,
59 offsetof(ngx_devpoll_conf_t, changes),
60 NULL},
61
62 {ngx_string("devpoll_events"),
63 NGX_EVENT_CONF|NGX_CONF_TAKE1,
64 ngx_conf_set_num_slot,
65 0,
66 offsetof(ngx_devpoll_conf_t, events),
67 NULL},
68
69 ngx_null_command
70 };
71
72
73 ngx_event_module_t ngx_devpoll_module_ctx = {
74 &devpoll_name,
75 ngx_devpoll_create_conf, /* create configuration */
76 ngx_devpoll_init_conf, /* init configuration */
77
78 {
79 ngx_devpoll_add_event, /* add an event */
80 ngx_devpoll_del_event, /* delete an event */
81 ngx_devpoll_add_event, /* enable an event */
82 ngx_devpoll_del_event, /* disable an event */
83 NULL, /* add an connection */
84 NULL, /* delete an connection */
85 NULL, /* process the changes */
86 ngx_devpoll_process_events, /* process the events */
87 ngx_devpoll_init, /* init the events */
88 ngx_devpoll_done, /* done the events */
89 }
90
91 };
92
93 ngx_module_t ngx_devpoll_module = {
94 NGX_MODULE,
95 &ngx_devpoll_module_ctx, /* module context */
96 ngx_devpoll_commands, /* module directives */
97 NGX_EVENT_MODULE, /* module type */
98 NULL, /* init module */
99 NULL /* init process */
100 };
101
102
103 static int ngx_devpoll_init(ngx_cycle_t *cycle)
104 {
105 size_t n;
106 ngx_devpoll_conf_t *dpcf;
107
108 dpcf = ngx_event_get_conf(cycle->conf_ctx, ngx_devpoll_module);
109
110 if (dp == -1) {
111 dp = open("/dev/poll", O_RDWR);
112
113 if (dp == -1) {
114 ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
115 "open(/dev/poll) failed");
116 return NGX_ERROR;
117 }
118 }
119
120 if (max_changes < dpcf->changes) {
121 if (nchanges) {
122 n = nchanges * sizeof(struct pollfd);
123 if (write(dp, change_list, n) != (ssize_t) n) {
124 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
125 "write(/dev/poll) failed");
126 return NGX_ERROR;
127 }
128
129 nchanges = 0;
130 }
131
132 if (change_list) {
133 ngx_free(change_list);
134 }
135
136 ngx_test_null(change_list,
137 ngx_alloc(sizeof(struct pollfd) * dpcf->changes,
138 cycle->log),
139 NGX_ERROR);
140
141 if (change_index) {
142 ngx_free(change_index);
143 }
144
145 ngx_test_null(change_index,
146 ngx_alloc(sizeof(ngx_event_t *) * dpcf->changes,
147 cycle->log),
148 NGX_ERROR);
149 }
150
151 max_changes = dpcf->changes;
152
153 if (nevents < dpcf->events) {
154 if (event_list) {
155 ngx_free(event_list);
156 }
157
158 ngx_test_null(event_list,
159 ngx_alloc(sizeof(struct pollfd) * dpcf->events,
160 cycle->log),
161 NGX_ERROR);
162 }
163
164 nevents = dpcf->events;
165
166 ngx_io = ngx_os_io;
167
168 ngx_event_actions = ngx_devpoll_module_ctx.actions;
169
170 ngx_event_flags = NGX_USE_LEVEL_EVENT;
171
172 return NGX_OK;
173 }
174
175
176 static void ngx_devpoll_done(ngx_cycle_t *cycle)
177 {
178 if (close(dp) == -1) {
179 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
180 "close(/dev/poll) failed");
181 }
182
183 dp = -1;
184
185 ngx_free(change_list);
186 ngx_free(event_list);
187 ngx_free(change_index);
188
189 change_list = NULL;
190 event_list = NULL;
191 change_index = NULL;
192 max_changes = 0;
193 nchanges = 0;
194 nevents = 0;
195 }
196
197
198 static int ngx_devpoll_add_event(ngx_event_t *ev, int event, u_int flags)
199 {
200 #if (NGX_DEBUG)
201 ngx_connection_t *c;
202 #endif
203
204 #if (NGX_READ_EVENT != POLLIN)
205 if (event == NGX_READ_EVENT) {
206 event = POLLOUT;
207 #if (NGX_WRITE_EVENT != POLLOUT)
208 } else {
209 event = POLLIN;
210 #endif
211 }
212 #endif
213
214 #if (NGX_DEBUG)
215 c = ev->data;
216 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
217 "devpoll add event: fd:%d ev:%04X", c->fd, event);
218 #endif
219
220 ev->active = 1;
221 return ngx_devpoll_set_event(ev, event, 0);
222 }
223
224
225 static int ngx_devpoll_del_event(ngx_event_t *ev, int event, u_int flags)
226 {
227 ngx_event_t *e;
228 ngx_connection_t *c;
229
230 c = ev->data;
231
232 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
233 "devpoll del event: fd:%d ev:%04X", c->fd, event);
234
235 if (ngx_devpoll_set_event(ev, POLLREMOVE, flags) == NGX_ERROR) {
236 return NGX_ERROR;
237 }
238
239 ev->active = 0;
240
241 if (flags & NGX_CLOSE_EVENT) {
242 return NGX_OK;
243 }
244
245 /* we need to restore the second event if it exists */
246
247 if (event == NGX_READ_EVENT) {
248 if (ev->accept) {
249 return NGX_OK;
250 }
251
252 e = c->write;
253 event = POLLOUT;
254
255 } else {
256 e = c->read;
257 event = POLLIN;
258 }
259
260 if (e) {
261 return ngx_devpoll_set_event(e, event, 0);
262 }
263
264 return NGX_OK;
265 }
266
267
268 static int ngx_devpoll_set_event(ngx_event_t *ev, int event, u_int flags)
269 {
270 size_t n;
271 ngx_connection_t *c;
272
273 c = ev->data;
274
275 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
276 "devpoll fd:%d ev:%d fl:%d", c->fd, event, flags);
277
278 if (nchanges >= max_changes) {
279 ngx_log_error(NGX_LOG_WARN, ev->log, 0,
280 "/dev/pool change list is filled up");
281
282 n = nchanges * sizeof(struct pollfd);
283 if (write(dp, change_list, n) != (ssize_t) n) {
284 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno,
285 "write(/dev/poll) failed");
286 return NGX_ERROR;
287 }
288
289 nchanges = 0;
290 }
291
292 change_list[nchanges].fd = c->fd;
293 change_list[nchanges].events = event;
294 change_list[nchanges].revents = 0;
295
296 change_index[nchanges] = ev;
297 ev->index = nchanges;
298
299 nchanges++;
300
301 if (flags & NGX_CLOSE_EVENT) {
302 n = nchanges * sizeof(struct pollfd);
303 if (write(dp, change_list, n) != (ssize_t) n) {
304 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno,
305 "write(/dev/poll) failed");
306 return NGX_ERROR;
307 }
308
309 nchanges = 0;
310 }
311
312 return NGX_OK;
313 }
314
315
316 int ngx_devpoll_process_events(ngx_cycle_t *cycle)
317 {
318 int events;
319 ngx_int_t i;
320 ngx_uint_t j, lock, accept_lock, expire;
321 size_t n;
322 ngx_msec_t timer;
323 ngx_err_t err;
324 ngx_cycle_t **old_cycle;
325 ngx_event_t *rev, *wev;
326 ngx_connection_t *c;
327 ngx_epoch_msec_t delta;
328 struct dvpoll dvp;
329 struct timeval tv;
330
331 for ( ;; ) {
332 timer = ngx_event_find_timer();
333
334 if (timer != 0) {
335 break;
336 }
337
338 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
339 "devpoll expired timer");
340
341 ngx_event_expire_timers((ngx_msec_t)
342 (ngx_elapsed_msec - ngx_old_elapsed_msec));
343 }
344
345 /* NGX_TIMER_INFINITE == INFTIM */
346
347 if (timer == NGX_TIMER_INFINITE) {
348 expire = 0;
349
350 } else {
351 expire = 1;
352 }
353
354 ngx_old_elapsed_msec = ngx_elapsed_msec;
355 accept_lock = 0;
356
357 if (ngx_accept_mutex) {
358 if (ngx_accept_disabled > 0) {
359 ngx_accept_disabled--;
360
361 } else {
362 if (ngx_trylock_accept_mutex(cycle) == NGX_ERROR) {
363 return NGX_ERROR;
364 }
365
366 if (ngx_accept_mutex_held) {
367 accept_lock = 1;
368
369 } else if (timer == NGX_TIMER_INFINITE
370 || timer > ngx_accept_mutex_delay)
371 {
372 timer = ngx_accept_mutex_delay;
373 expire = 0;
374 }
375 }
376 }
377
378 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
379 "devpoll timer: %d", timer);
380
381 if (nchanges) {
382 n = nchanges * sizeof(struct pollfd);
383 if (write(dp, change_list, n) != (ssize_t) n) {
384 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
385 "write(/dev/poll) failed");
386 ngx_accept_mutex_unlock();
387 return NGX_ERROR;
388 }
389 }
390
391 dvp.dp_fds = event_list;
392 dvp.dp_nfds = nevents;
393 dvp.dp_timeout = timer;
394 events = ioctl(dp, DP_POLL, &dvp);
395
396 if (events == -1) {
397 err = ngx_errno;
398 } else {
399 err = 0;
400 }
401
402 nchanges = 0;
403
404 ngx_gettimeofday(&tv);
405 ngx_time_update(tv.tv_sec);
406
407 delta = ngx_elapsed_msec;
408 ngx_elapsed_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000
409 + tv.tv_usec / 1000 - ngx_start_msec;
410
411 if (err) {
412 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
413 cycle->log, err, "ioctl(DP_POLL) failed");
414 ngx_accept_mutex_unlock();
415 return NGX_ERROR;
416 }
417
418 if (timer != NGX_TIMER_INFINITE) {
419 delta = ngx_elapsed_msec - delta;
420
421 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
422 "devpoll timer: %d, delta: %d", timer, (int) delta);
423 } else {
424 if (events == 0) {
425 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
426 "ioctl(DP_POLL) returned no events without timeout");
427 ngx_accept_mutex_unlock();
428 return NGX_ERROR;
429 }
430 }
431
432 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
433 ngx_accept_mutex_unlock();
434 return NGX_ERROR;
435 }
436
437 lock = 1;
438
439 for (i = 0; i < events; i++) {
440 c = &ngx_cycle->connections[event_list[i].fd];
441
442 if (c->fd == -1) {
443 old_cycle = ngx_old_cycles.elts;
444 for (j = 0; j < ngx_old_cycles.nelts; j++) {
445 if (old_cycle[j] == NULL) {
446 continue;
447 }
448 c = &old_cycle[j]->connections[event_list[i].fd];
449 if (c->fd != -1) {
450 break;
451 }
452 }
453 }
454
455 if (c->fd == -1) {
456 ngx_log_error(NGX_LOG_EMERG, cycle->log, 0, "unknown cycle");
457 exit(1);
458 }
459
460 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
461 "devpoll: fd:%d, ev:%04X, rev:%04X",
462 event_list[i].fd,
463 event_list[i].events, event_list[i].revents);
464
465 if (event_list[i].revents & (POLLERR|POLLHUP|POLLNVAL)) {
466 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
467 "ioctl(DP_POLL) error fd:%d ev:%04X rev:%04X",
468 event_list[i].fd,
469 event_list[i].events, event_list[i].revents);
470 }
471
472 if (event_list[i].revents & ~(POLLIN|POLLOUT|POLLERR|POLLHUP|POLLNVAL))
473 {
474 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
475 "strange ioctl(DP_POLL) events "
476 "fd:%d ev:%04X rev:%04X",
477 event_list[i].fd,
478 event_list[i].events, event_list[i].revents);
479 }
480
481 wev = c->write;
482
483 if ((event_list[i].events & (POLLOUT|POLLERR|POLLHUP)) && wev->active) {
484 wev->ready = 1;
485
486 if (!ngx_threaded && !ngx_accept_mutex_held) {
487 wev->event_handler(wev);
488
489 } else {
490 ngx_post_event(wev);
491 }
492 }
493
494 /*
495 * POLLIN must be handled after POLLOUT because we use
496 * the optimization to avoid the unnecessary mutex locking/unlocking
497 * if the accept event is the last one.
498 */
499
500 rev = c->read;
501
502 if ((event_list[i].events & (POLLIN|POLLERR|POLLHUP)) && rev->active) {
503 rev->ready = 1;
504
505 if (!ngx_threaded && !ngx_accept_mutex_held) {
506 rev->event_handler(rev);
507
508 } else if (!rev->accept) {
509 ngx_post_event(rev);
510
511 } else if (ngx_accept_disabled <= 0) {
512 ngx_mutex_unlock(ngx_posted_events_mutex);
513
514 c->read->event_handler(rev);
515
516 if (ngx_accept_disabled > 0) {
517 ngx_accept_mutex_unlock();
518 accept_lock = 0;
519 }
520
521 if (i + 1 == events) {
522 lock = 0;
523 break;
524 }
525
526 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
527 if (accept_lock) {
528 ngx_accept_mutex_unlock();
529 }
530 return NGX_ERROR;
531 }
532 }
533 }
534 }
535
536 if (accept_lock) {
537 ngx_accept_mutex_unlock();
538 }
539
540 if (lock) {
541 ngx_mutex_unlock(ngx_posted_events_mutex);
542 }
543
544 if (expire && delta) {
545 ngx_event_expire_timers((ngx_msec_t) delta);
546 }
547
548 if (!ngx_threaded) {
549 ngx_event_process_posted(cycle);
550 }
551
552 return NGX_OK;
553 }
554
555
556 static void *ngx_devpoll_create_conf(ngx_cycle_t *cycle)
557 {
558 ngx_devpoll_conf_t *dpcf;
559
560 ngx_test_null(dpcf, ngx_palloc(cycle->pool, sizeof(ngx_devpoll_conf_t)),
561 NGX_CONF_ERROR);
562
563 dpcf->changes = NGX_CONF_UNSET;
564 dpcf->events = NGX_CONF_UNSET;
565
566 return dpcf;
567 }
568
569
570 static char *ngx_devpoll_init_conf(ngx_cycle_t *cycle, void *conf)
571 {
572 ngx_devpoll_conf_t *dpcf = conf;
573
574 ngx_conf_init_unsigned_value(dpcf->changes, 512);
575 ngx_conf_init_unsigned_value(dpcf->events, 512);
576
577 return NGX_CONF_OK;
578 }