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
|
18
|
12 #if (NGX_TEST_BUILD_EPOLL)
|
0
|
13
|
|
14 /* epoll declarations */
|
|
15
|
|
16 #define EPOLLIN 0x001
|
|
17 #define EPOLLPRI 0x002
|
|
18 #define EPOLLOUT 0x004
|
|
19 #define EPOLLRDNORM 0x040
|
|
20 #define EPOLLRDBAND 0x080
|
|
21 #define EPOLLWRNORM 0x100
|
|
22 #define EPOLLWRBAND 0x200
|
|
23 #define EPOLLMSG 0x400
|
|
24 #define EPOLLERR 0x008
|
|
25 #define EPOLLHUP 0x010
|
|
26
|
|
27 #define EPOLLET 0x80000000
|
|
28 #define EPOLLONESHOT 0x40000000
|
|
29
|
|
30 #define EPOLL_CTL_ADD 1
|
|
31 #define EPOLL_CTL_DEL 2
|
|
32 #define EPOLL_CTL_MOD 3
|
|
33
|
|
34 typedef union epoll_data {
|
|
35 void *ptr;
|
|
36 int fd;
|
|
37 uint32_t u32;
|
|
38 uint64_t u64;
|
|
39 } epoll_data_t;
|
|
40
|
|
41 struct epoll_event {
|
|
42 uint32_t events;
|
|
43 epoll_data_t data;
|
|
44 };
|
|
45
|
|
46 int epoll_create(int size);
|
|
47 int epoll_ctl(int epfd, int op, int fd, struct epoll_event *event);
|
|
48 int epoll_wait(int epfd, struct epoll_event *events, int nevents, int timeout);
|
|
49
|
|
50 int epoll_create(int size)
|
|
51 {
|
|
52 return -1;
|
|
53 }
|
|
54
|
|
55 int epoll_ctl(int epfd, int op, int fd, struct epoll_event *event)
|
|
56 {
|
|
57 return -1;
|
|
58 }
|
|
59
|
|
60 int epoll_wait(int epfd, struct epoll_event *events, int nevents, int timeout)
|
|
61 {
|
|
62 return -1;
|
|
63 }
|
|
64
|
|
65 #endif
|
|
66
|
|
67
|
|
68 typedef struct {
|
|
69 u_int events;
|
|
70 } ngx_epoll_conf_t;
|
|
71
|
|
72
|
112
|
73 static ngx_int_t ngx_epoll_init(ngx_cycle_t *cycle, ngx_msec_t timer);
|
0
|
74 static void ngx_epoll_done(ngx_cycle_t *cycle);
|
48
|
75 static ngx_int_t ngx_epoll_add_event(ngx_event_t *ev, int event, u_int flags);
|
|
76 static ngx_int_t ngx_epoll_del_event(ngx_event_t *ev, int event, u_int flags);
|
|
77 static ngx_int_t ngx_epoll_add_connection(ngx_connection_t *c);
|
|
78 static ngx_int_t ngx_epoll_del_connection(ngx_connection_t *c, u_int flags);
|
112
|
79 static ngx_int_t ngx_epoll_process_events(ngx_cycle_t *cycle, ngx_msec_t timer,
|
|
80 ngx_uint_t flags);
|
0
|
81
|
|
82 static void *ngx_epoll_create_conf(ngx_cycle_t *cycle);
|
|
83 static char *ngx_epoll_init_conf(ngx_cycle_t *cycle, void *conf);
|
|
84
|
|
85 static int ep = -1;
|
|
86 static struct epoll_event *event_list;
|
|
87 static u_int nevents;
|
|
88
|
|
89
|
|
90 static ngx_str_t epoll_name = ngx_string("epoll");
|
|
91
|
|
92 static ngx_command_t ngx_epoll_commands[] = {
|
|
93
|
48
|
94 { ngx_string("epoll_events"),
|
|
95 NGX_EVENT_CONF|NGX_CONF_TAKE1,
|
|
96 ngx_conf_set_num_slot,
|
|
97 0,
|
|
98 offsetof(ngx_epoll_conf_t, events),
|
|
99 NULL },
|
0
|
100
|
48
|
101 ngx_null_command
|
0
|
102 };
|
|
103
|
|
104
|
|
105 ngx_event_module_t ngx_epoll_module_ctx = {
|
|
106 &epoll_name,
|
|
107 ngx_epoll_create_conf, /* create configuration */
|
|
108 ngx_epoll_init_conf, /* init configuration */
|
|
109
|
|
110 {
|
|
111 ngx_epoll_add_event, /* add an event */
|
|
112 ngx_epoll_del_event, /* delete an event */
|
|
113 ngx_epoll_add_event, /* enable an event */
|
|
114 ngx_epoll_del_event, /* disable an event */
|
|
115 ngx_epoll_add_connection, /* add an connection */
|
|
116 ngx_epoll_del_connection, /* delete an connection */
|
|
117 NULL, /* process the changes */
|
|
118 ngx_epoll_process_events, /* process the events */
|
|
119 ngx_epoll_init, /* init the events */
|
|
120 ngx_epoll_done, /* done the events */
|
|
121 }
|
|
122 };
|
|
123
|
|
124 ngx_module_t ngx_epoll_module = {
|
58
|
125 NGX_MODULE_V1,
|
0
|
126 &ngx_epoll_module_ctx, /* module context */
|
|
127 ngx_epoll_commands, /* module directives */
|
|
128 NGX_EVENT_MODULE, /* module type */
|
90
|
129 NULL, /* init master */
|
0
|
130 NULL, /* init module */
|
90
|
131 NULL, /* init process */
|
|
132 NULL, /* init thread */
|
|
133 NULL, /* exit thread */
|
|
134 NULL, /* exit process */
|
|
135 NULL, /* exit master */
|
|
136 NGX_MODULE_V1_PADDING
|
0
|
137 };
|
|
138
|
|
139
|
48
|
140 static ngx_int_t
|
112
|
141 ngx_epoll_init(ngx_cycle_t *cycle, ngx_msec_t timer)
|
0
|
142 {
|
|
143 ngx_event_conf_t *ecf;
|
|
144 ngx_epoll_conf_t *epcf;
|
|
145
|
|
146 ecf = ngx_event_get_conf(cycle->conf_ctx, ngx_event_core_module);
|
|
147
|
|
148 epcf = ngx_event_get_conf(cycle->conf_ctx, ngx_epoll_module);
|
|
149
|
|
150 if (ep == -1) {
|
|
151 ep = epoll_create(ecf->connections / 2);
|
|
152
|
|
153 if (ep == -1) {
|
|
154 ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
|
|
155 "epoll_create() failed");
|
|
156 return NGX_ERROR;
|
|
157 }
|
|
158 }
|
|
159
|
|
160 if (nevents < epcf->events) {
|
|
161 if (event_list) {
|
|
162 ngx_free(event_list);
|
|
163 }
|
|
164
|
|
165 event_list = ngx_alloc(sizeof(struct epoll_event) * epcf->events,
|
|
166 cycle->log);
|
|
167 if (event_list == NULL) {
|
|
168 return NGX_ERROR;
|
|
169 }
|
|
170 }
|
|
171
|
|
172 nevents = epcf->events;
|
|
173
|
|
174 ngx_io = ngx_os_io;
|
|
175
|
|
176 ngx_event_actions = ngx_epoll_module_ctx.actions;
|
|
177
|
18
|
178 #if (NGX_HAVE_CLEAR_EVENT)
|
0
|
179 ngx_event_flags = NGX_USE_CLEAR_EVENT
|
|
180 #else
|
|
181 ngx_event_flags = NGX_USE_LEVEL_EVENT
|
|
182 #endif
|
4
|
183 |NGX_USE_GREEDY_EVENT
|
0
|
184 |NGX_USE_EPOLL_EVENT;
|
|
185
|
|
186 return NGX_OK;
|
|
187 }
|
|
188
|
|
189
|
48
|
190 static void
|
|
191 ngx_epoll_done(ngx_cycle_t *cycle)
|
0
|
192 {
|
|
193 if (close(ep) == -1) {
|
|
194 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
|
|
195 "epoll close() failed");
|
|
196 }
|
|
197
|
|
198 ep = -1;
|
|
199
|
|
200 ngx_free(event_list);
|
|
201
|
|
202 event_list = NULL;
|
|
203 nevents = 0;
|
|
204 }
|
|
205
|
|
206
|
48
|
207 static ngx_int_t
|
|
208 ngx_epoll_add_event(ngx_event_t *ev, int event, u_int flags)
|
0
|
209 {
|
32
|
210 int op;
|
|
211 uint32_t events, prev;
|
0
|
212 ngx_event_t *e;
|
|
213 ngx_connection_t *c;
|
|
214 struct epoll_event ee;
|
|
215
|
|
216 c = ev->data;
|
|
217
|
32
|
218 events = (uint32_t) event;
|
|
219
|
0
|
220 if (event == NGX_READ_EVENT) {
|
|
221 e = c->write;
|
|
222 prev = EPOLLOUT;
|
|
223 #if (NGX_READ_EVENT != EPOLLIN)
|
32
|
224 events = EPOLLIN;
|
0
|
225 #endif
|
|
226
|
|
227 } else {
|
|
228 e = c->read;
|
|
229 prev = EPOLLIN;
|
|
230 #if (NGX_WRITE_EVENT != EPOLLOUT)
|
32
|
231 events = EPOLLOUT;
|
0
|
232 #endif
|
|
233 }
|
|
234
|
|
235 if (e->active) {
|
|
236 op = EPOLL_CTL_MOD;
|
32
|
237 events |= prev;
|
0
|
238
|
|
239 } else {
|
|
240 op = EPOLL_CTL_ADD;
|
|
241 }
|
|
242
|
32
|
243 ee.events = events | flags;
|
30
|
244 ee.data.u64 = (uintptr_t) c | ev->instance;
|
0
|
245
|
|
246 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
|
10
|
247 "epoll add event: fd:%d op:%d ev:%08XD",
|
0
|
248 c->fd, op, ee.events);
|
|
249
|
|
250 if (epoll_ctl(ep, op, c->fd, &ee) == -1) {
|
|
251 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno,
|
|
252 "epoll_ctl(%d, %d) failed", op, c->fd);
|
|
253 return NGX_ERROR;
|
|
254 }
|
|
255
|
|
256 ev->active = 1;
|
|
257 #if 0
|
|
258 ev->oneshot = (flags & NGX_ONESHOT_EVENT) ? 1 : 0;
|
|
259 #endif
|
|
260
|
|
261 return NGX_OK;
|
|
262 }
|
|
263
|
|
264
|
48
|
265 static ngx_int_t
|
|
266 ngx_epoll_del_event(ngx_event_t *ev, int event, u_int flags)
|
0
|
267 {
|
32
|
268 int op;
|
|
269 uint32_t prev;
|
0
|
270 ngx_event_t *e;
|
|
271 ngx_connection_t *c;
|
|
272 struct epoll_event ee;
|
|
273
|
|
274 /*
|
32
|
275 * when the file descriptor is closed, the epoll automatically deletes
|
|
276 * it from its queue, so we do not need to delete explicity the event
|
0
|
277 * before the closing the file descriptor
|
|
278 */
|
|
279
|
|
280 if (flags & NGX_CLOSE_EVENT) {
|
|
281 ev->active = 0;
|
|
282 return NGX_OK;
|
|
283 }
|
|
284
|
|
285 c = ev->data;
|
|
286
|
|
287 if (event == NGX_READ_EVENT) {
|
|
288 e = c->write;
|
|
289 prev = EPOLLOUT;
|
|
290
|
|
291 } else {
|
|
292 e = c->read;
|
|
293 prev = EPOLLIN;
|
|
294 }
|
|
295
|
|
296 if (e->active) {
|
|
297 op = EPOLL_CTL_MOD;
|
|
298 ee.events = prev | flags;
|
30
|
299 ee.data.u64 = (uintptr_t) c | ev->instance;
|
0
|
300
|
|
301 } else {
|
|
302 op = EPOLL_CTL_DEL;
|
|
303 ee.events = 0;
|
|
304 ee.data.ptr = NULL;
|
|
305 }
|
|
306
|
|
307 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
|
10
|
308 "epoll del event: fd:%d op:%d ev:%08XD",
|
0
|
309 c->fd, op, ee.events);
|
|
310
|
|
311 if (epoll_ctl(ep, op, c->fd, &ee) == -1) {
|
|
312 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno,
|
|
313 "epoll_ctl(%d, %d) failed", op, c->fd);
|
|
314 return NGX_ERROR;
|
|
315 }
|
|
316
|
|
317 ev->active = 0;
|
|
318
|
|
319 return NGX_OK;
|
|
320 }
|
|
321
|
|
322
|
48
|
323 static ngx_int_t
|
|
324 ngx_epoll_add_connection(ngx_connection_t *c)
|
0
|
325 {
|
|
326 struct epoll_event ee;
|
|
327
|
|
328 ee.events = EPOLLIN|EPOLLOUT|EPOLLET;
|
30
|
329 ee.data.u64 = (uintptr_t) c | c->read->instance;
|
0
|
330
|
|
331 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
|
10
|
332 "epoll add connection: fd:%d ev:%08XD", c->fd, ee.events);
|
0
|
333
|
|
334 if (epoll_ctl(ep, EPOLL_CTL_ADD, c->fd, &ee) == -1) {
|
|
335 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
|
|
336 "epoll_ctl(EPOLL_CTL_ADD, %d) failed", c->fd);
|
|
337 return NGX_ERROR;
|
|
338 }
|
|
339
|
|
340 c->read->active = 1;
|
|
341 c->write->active = 1;
|
|
342
|
|
343 return NGX_OK;
|
|
344 }
|
|
345
|
|
346
|
48
|
347 static ngx_int_t
|
|
348 ngx_epoll_del_connection(ngx_connection_t *c, u_int flags)
|
0
|
349 {
|
|
350 int op;
|
|
351 struct epoll_event ee;
|
|
352
|
|
353 /*
|
|
354 * when the file descriptor is closed the epoll automatically deletes
|
|
355 * it from its queue so we do not need to delete explicity the event
|
|
356 * before the closing the file descriptor
|
|
357 */
|
|
358
|
|
359 if (flags & NGX_CLOSE_EVENT) {
|
|
360 c->read->active = 0;
|
|
361 c->write->active = 0;
|
|
362 return NGX_OK;
|
|
363 }
|
|
364
|
|
365 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
|
|
366 "epoll del connection: fd:%d", c->fd);
|
|
367
|
|
368 op = EPOLL_CTL_DEL;
|
|
369 ee.events = 0;
|
30
|
370 ee.data.u64 = 0;
|
0
|
371
|
|
372 if (epoll_ctl(ep, op, c->fd, &ee) == -1) {
|
|
373 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
|
|
374 "epoll_ctl(%d, %d) failed", op, c->fd);
|
|
375 return NGX_ERROR;
|
|
376 }
|
|
377
|
|
378 c->read->active = 0;
|
|
379 c->write->active = 0;
|
|
380
|
|
381 return NGX_OK;
|
|
382 }
|
|
383
|
|
384
|
48
|
385 static ngx_int_t
|
112
|
386 ngx_epoll_process_events(ngx_cycle_t *cycle, ngx_msec_t timer, ngx_uint_t flags)
|
0
|
387 {
|
|
388 int events;
|
32
|
389 uint32_t revents;
|
0
|
390 ngx_int_t instance, i;
|
112
|
391 ngx_uint_t level;
|
0
|
392 ngx_err_t err;
|
|
393 ngx_log_t *log;
|
112
|
394 ngx_msec_t delta;
|
|
395 ngx_event_t *rev, *wev, **queue;
|
0
|
396 ngx_connection_t *c;
|
|
397
|
|
398 /* NGX_TIMER_INFINITE == INFTIM */
|
|
399
|
|
400 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
106
|
401 "epoll timer: %M", timer);
|
0
|
402
|
|
403 events = epoll_wait(ep, event_list, nevents, timer);
|
|
404
|
|
405 if (events == -1) {
|
|
406 err = ngx_errno;
|
|
407 } else {
|
|
408 err = 0;
|
|
409 }
|
|
410
|
112
|
411 delta = ngx_current_msec;
|
|
412
|
|
413 if (flags & NGX_UPDATE_TIME) {
|
|
414 ngx_time_update(0, 0);
|
|
415 }
|
0
|
416
|
|
417 if (timer != NGX_TIMER_INFINITE) {
|
112
|
418 delta = ngx_current_msec - delta;
|
0
|
419
|
|
420 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
106
|
421 "epoll timer: %M, delta: %M", timer, delta);
|
0
|
422 } else {
|
|
423 if (events == 0) {
|
|
424 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
425 "epoll_wait() returned no events without timeout");
|
|
426 return NGX_ERROR;
|
|
427 }
|
|
428 }
|
|
429
|
|
430 if (err) {
|
112
|
431 if (err == NGX_EINTR) {
|
|
432
|
|
433 if (ngx_event_timer_alarm) {
|
|
434 ngx_event_timer_alarm = 0;
|
|
435 return NGX_OK;
|
|
436 }
|
|
437
|
|
438 level = NGX_LOG_INFO;
|
|
439
|
|
440 } else {
|
|
441 level = NGX_LOG_ALERT;
|
|
442 }
|
|
443
|
|
444 ngx_log_error(level, cycle->log, err, "epoll_wait() failed");
|
0
|
445 return NGX_ERROR;
|
|
446 }
|
|
447
|
112
|
448 if (events == 0) {
|
|
449 return NGX_OK;
|
|
450 }
|
0
|
451
|
112
|
452 ngx_mutex_lock(ngx_posted_events_mutex);
|
0
|
453
|
|
454 log = cycle->log;
|
|
455
|
|
456 for (i = 0; i < events; i++) {
|
|
457 c = event_list[i].data.ptr;
|
|
458
|
|
459 instance = (uintptr_t) c & 1;
|
|
460 c = (ngx_connection_t *) ((uintptr_t) c & (uintptr_t) ~1);
|
|
461
|
|
462 rev = c->read;
|
|
463
|
|
464 if (c->fd == -1 || rev->instance != instance) {
|
|
465
|
|
466 /*
|
|
467 * the stale event from a file descriptor
|
|
468 * that was just closed in this iteration
|
|
469 */
|
|
470
|
|
471 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
10
|
472 "epoll: stale event %p", c);
|
0
|
473 continue;
|
|
474 }
|
|
475
|
|
476 #if (NGX_DEBUG0)
|
|
477 log = c->log ? c->log : cycle->log;
|
|
478 #endif
|
|
479
|
32
|
480 revents = event_list[i].events;
|
|
481
|
0
|
482 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, log, 0,
|
10
|
483 "epoll: fd:%d ev:%04XD d:%p",
|
32
|
484 c->fd, revents, event_list[i].data);
|
0
|
485
|
32
|
486 if (revents & (EPOLLERR|EPOLLHUP)) {
|
0
|
487 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, log, 0,
|
10
|
488 "epoll_wait() error on fd:%d ev:%04XD",
|
32
|
489 c->fd, revents);
|
|
490 }
|
|
491
|
|
492 if (revents & ~(EPOLLIN|EPOLLOUT|EPOLLERR|EPOLLHUP)) {
|
|
493 ngx_log_error(NGX_LOG_ALERT, log, 0,
|
|
494 "strange epoll_wait() events fd:%d ev:%04XD",
|
|
495 c->fd, revents);
|
0
|
496 }
|
|
497
|
32
|
498 if ((revents & (EPOLLERR|EPOLLHUP))
|
|
499 && (revents & (EPOLLIN|EPOLLOUT)) == 0)
|
|
500 {
|
|
501 /*
|
|
502 * if the error events were returned without EPOLLIN or EPOLLOUT,
|
|
503 * then add these flags to handle the events at least in one
|
|
504 * active handler
|
|
505 */
|
|
506
|
|
507 revents |= EPOLLIN|EPOLLOUT;
|
0
|
508 }
|
|
509
|
112
|
510 if ((revents & EPOLLIN) && rev->active) {
|
|
511
|
|
512 if ((flags & NGX_POST_THREAD_EVENTS) && !rev->accept) {
|
|
513 rev->posted_ready = 1;
|
|
514
|
|
515 } else {
|
|
516 rev->ready = 1;
|
|
517 }
|
|
518
|
|
519 if (flags & NGX_POST_EVENTS) {
|
|
520 queue = (ngx_event_t **) (rev->accept ?
|
|
521 &ngx_posted_accept_events : &ngx_posted_events);
|
|
522
|
|
523 ngx_locked_post_event(rev, queue);
|
|
524
|
|
525 } else {
|
|
526 rev->handler(rev);
|
|
527 }
|
|
528 }
|
|
529
|
0
|
530 wev = c->write;
|
|
531
|
32
|
532 if ((revents & EPOLLOUT) && wev->active) {
|
|
533
|
112
|
534 if (flags & NGX_POST_THREAD_EVENTS) {
|
0
|
535 wev->posted_ready = 1;
|
|
536
|
|
537 } else {
|
|
538 wev->ready = 1;
|
|
539 }
|
|
540
|
112
|
541 if (flags & NGX_POST_EVENTS) {
|
|
542 ngx_locked_post_event(wev, &ngx_posted_events);
|
0
|
543
|
112
|
544 } else {
|
|
545 wev->handler(wev);
|
0
|
546 }
|
|
547 }
|
|
548 }
|
|
549
|
112
|
550 ngx_mutex_unlock(ngx_posted_events_mutex);
|
0
|
551
|
|
552 return NGX_OK;
|
|
553 }
|
|
554
|
|
555
|
48
|
556 static void *
|
|
557 ngx_epoll_create_conf(ngx_cycle_t *cycle)
|
0
|
558 {
|
|
559 ngx_epoll_conf_t *epcf;
|
|
560
|
50
|
561 epcf = ngx_palloc(cycle->pool, sizeof(ngx_epoll_conf_t));
|
|
562 if (epcf == NULL) {
|
|
563 return NGX_CONF_ERROR;
|
|
564 }
|
0
|
565
|
|
566 epcf->events = NGX_CONF_UNSET;
|
|
567
|
|
568 return epcf;
|
|
569 }
|
|
570
|
|
571
|
48
|
572 static char *
|
|
573 ngx_epoll_init_conf(ngx_cycle_t *cycle, void *conf)
|
0
|
574 {
|
|
575 ngx_epoll_conf_t *epcf = conf;
|
|
576
|
|
577 ngx_conf_init_unsigned_value(epcf->events, 512);
|
|
578
|
|
579 return NGX_CONF_OK;
|
|
580 }
|