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
|
112
|
12 static ngx_int_t ngx_select_init(ngx_cycle_t *cycle, ngx_msec_t timer);
|
0
|
13 static void ngx_select_done(ngx_cycle_t *cycle);
|
324
|
14 static ngx_int_t ngx_select_add_event(ngx_event_t *ev, ngx_int_t event,
|
|
15 ngx_uint_t flags);
|
|
16 static ngx_int_t ngx_select_del_event(ngx_event_t *ev, ngx_int_t event,
|
|
17 ngx_uint_t flags);
|
112
|
18 static ngx_int_t ngx_select_process_events(ngx_cycle_t *cycle, ngx_msec_t timer,
|
|
19 ngx_uint_t flags);
|
493
|
20 static void ngx_select_repair_fd_sets(ngx_cycle_t *cycle);
|
0
|
21 static char *ngx_select_init_conf(ngx_cycle_t *cycle, void *conf);
|
|
22
|
|
23
|
|
24 static fd_set master_read_fd_set;
|
|
25 static fd_set master_write_fd_set;
|
|
26 static fd_set work_read_fd_set;
|
|
27 static fd_set work_write_fd_set;
|
|
28
|
324
|
29 static ngx_int_t max_fd;
|
0
|
30 static ngx_uint_t nevents;
|
|
31
|
|
32 static ngx_event_t **event_index;
|
|
33
|
|
34
|
|
35 static ngx_str_t select_name = ngx_string("select");
|
|
36
|
|
37 ngx_event_module_t ngx_select_module_ctx = {
|
|
38 &select_name,
|
|
39 NULL, /* create configuration */
|
|
40 ngx_select_init_conf, /* init configuration */
|
|
41
|
|
42 {
|
|
43 ngx_select_add_event, /* add an event */
|
|
44 ngx_select_del_event, /* delete an event */
|
|
45 ngx_select_add_event, /* enable an event */
|
|
46 ngx_select_del_event, /* disable an event */
|
|
47 NULL, /* add an connection */
|
|
48 NULL, /* delete an connection */
|
|
49 NULL, /* process the changes */
|
|
50 ngx_select_process_events, /* process the events */
|
|
51 ngx_select_init, /* init the events */
|
|
52 ngx_select_done /* done the events */
|
|
53 }
|
|
54
|
|
55 };
|
|
56
|
|
57 ngx_module_t ngx_select_module = {
|
58
|
58 NGX_MODULE_V1,
|
0
|
59 &ngx_select_module_ctx, /* module context */
|
|
60 NULL, /* module directives */
|
|
61 NGX_EVENT_MODULE, /* module type */
|
90
|
62 NULL, /* init master */
|
0
|
63 NULL, /* init module */
|
90
|
64 NULL, /* init process */
|
|
65 NULL, /* init thread */
|
|
66 NULL, /* exit thread */
|
|
67 NULL, /* exit process */
|
|
68 NULL, /* exit master */
|
|
69 NGX_MODULE_V1_PADDING
|
0
|
70 };
|
|
71
|
|
72
|
50
|
73 static ngx_int_t
|
112
|
74 ngx_select_init(ngx_cycle_t *cycle, ngx_msec_t timer)
|
0
|
75 {
|
|
76 ngx_event_t **index;
|
|
77
|
|
78 if (event_index == NULL) {
|
|
79 FD_ZERO(&master_read_fd_set);
|
|
80 FD_ZERO(&master_write_fd_set);
|
|
81 nevents = 0;
|
|
82 }
|
|
83
|
564
|
84 if (ngx_process >= NGX_PROCESS_WORKER
|
0
|
85 || cycle->old_cycle == NULL
|
|
86 || cycle->old_cycle->connection_n < cycle->connection_n)
|
|
87 {
|
50
|
88 index = ngx_alloc(sizeof(ngx_event_t *) * 2 * cycle->connection_n,
|
|
89 cycle->log);
|
|
90 if (index == NULL) {
|
|
91 return NGX_ERROR;
|
|
92 }
|
0
|
93
|
|
94 if (event_index) {
|
|
95 ngx_memcpy(index, event_index, sizeof(ngx_event_t *) * nevents);
|
|
96 ngx_free(event_index);
|
|
97 }
|
112
|
98
|
0
|
99 event_index = index;
|
|
100 }
|
|
101
|
|
102 ngx_io = ngx_os_io;
|
|
103
|
|
104 ngx_event_actions = ngx_select_module_ctx.actions;
|
|
105
|
112
|
106 ngx_event_flags = NGX_USE_LEVEL_EVENT;
|
0
|
107
|
|
108 max_fd = -1;
|
|
109
|
|
110 return NGX_OK;
|
|
111 }
|
|
112
|
|
113
|
50
|
114 static void
|
|
115 ngx_select_done(ngx_cycle_t *cycle)
|
0
|
116 {
|
|
117 ngx_free(event_index);
|
|
118
|
|
119 event_index = NULL;
|
|
120 }
|
|
121
|
|
122
|
50
|
123 static ngx_int_t
|
324
|
124 ngx_select_add_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags)
|
0
|
125 {
|
|
126 ngx_connection_t *c;
|
|
127
|
|
128 c = ev->data;
|
|
129
|
|
130 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
|
324
|
131 "select add event fd:%d ev:%i", c->fd, event);
|
0
|
132
|
|
133 if (ev->index != NGX_INVALID_INDEX) {
|
|
134 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
|
324
|
135 "select event fd:%d ev:%i is already set", c->fd, event);
|
0
|
136 return NGX_OK;
|
|
137 }
|
|
138
|
495
|
139 if ((event == NGX_READ_EVENT && ev->write)
|
|
140 || (event == NGX_WRITE_EVENT && !ev->write))
|
|
141 {
|
|
142 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
|
|
143 "invalid select %s event fd:%d ev:%i",
|
|
144 ev->write ? "write" : "read", c->fd, event);
|
|
145 return NGX_ERROR;
|
|
146 }
|
|
147
|
0
|
148 if (event == NGX_READ_EVENT) {
|
|
149 FD_SET(c->fd, &master_read_fd_set);
|
|
150
|
|
151 } else if (event == NGX_WRITE_EVENT) {
|
|
152 FD_SET(c->fd, &master_write_fd_set);
|
|
153 }
|
|
154
|
|
155 if (max_fd != -1 && max_fd < c->fd) {
|
|
156 max_fd = c->fd;
|
|
157 }
|
|
158
|
|
159 ev->active = 1;
|
|
160
|
|
161 event_index[nevents] = ev;
|
|
162 ev->index = nevents;
|
|
163 nevents++;
|
|
164
|
|
165 return NGX_OK;
|
|
166 }
|
|
167
|
|
168
|
50
|
169 static ngx_int_t
|
324
|
170 ngx_select_del_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags)
|
0
|
171 {
|
495
|
172 ngx_event_t *e;
|
0
|
173 ngx_connection_t *c;
|
|
174
|
|
175 c = ev->data;
|
|
176
|
|
177 ev->active = 0;
|
|
178
|
|
179 if (ev->index == NGX_INVALID_INDEX) {
|
|
180 return NGX_OK;
|
|
181 }
|
|
182
|
|
183 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
|
324
|
184 "select del event fd:%d ev:%i", c->fd, event);
|
0
|
185
|
|
186 if (event == NGX_READ_EVENT) {
|
|
187 FD_CLR(c->fd, &master_read_fd_set);
|
|
188
|
|
189 } else if (event == NGX_WRITE_EVENT) {
|
|
190 FD_CLR(c->fd, &master_write_fd_set);
|
|
191 }
|
|
192
|
|
193 if (max_fd == c->fd) {
|
|
194 max_fd = -1;
|
|
195 }
|
|
196
|
324
|
197 if (ev->index < --nevents) {
|
495
|
198 e = event_index[nevents];
|
|
199 event_index[ev->index] = e;
|
|
200 e->index = ev->index;
|
0
|
201 }
|
|
202
|
|
203 ev->index = NGX_INVALID_INDEX;
|
|
204
|
|
205 return NGX_OK;
|
|
206 }
|
|
207
|
|
208
|
50
|
209 static ngx_int_t
|
112
|
210 ngx_select_process_events(ngx_cycle_t *cycle, ngx_msec_t timer,
|
|
211 ngx_uint_t flags)
|
0
|
212 {
|
493
|
213 int ready, nready;
|
|
214 ngx_err_t err;
|
|
215 ngx_uint_t i, found;
|
|
216 ngx_event_t *ev, **queue;
|
|
217 struct timeval tv, *tp;
|
|
218 ngx_connection_t *c;
|
0
|
219
|
|
220 if (max_fd == -1) {
|
|
221 for (i = 0; i < nevents; i++) {
|
|
222 c = event_index[i]->data;
|
|
223 if (max_fd < c->fd) {
|
|
224 max_fd = c->fd;
|
|
225 }
|
|
226 }
|
|
227
|
|
228 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
229 "change max_fd: %d", max_fd);
|
|
230 }
|
|
231
|
|
232 #if (NGX_DEBUG)
|
|
233 if (cycle->log->log_level & NGX_LOG_DEBUG_ALL) {
|
|
234 for (i = 0; i < nevents; i++) {
|
|
235 ev = event_index[i];
|
|
236 c = ev->data;
|
|
237 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
238 "select event: fd:%d wr:%d", c->fd, ev->write);
|
|
239 }
|
|
240
|
|
241 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
242 "max_fd: %d", max_fd);
|
|
243 }
|
|
244 #endif
|
|
245
|
|
246 if (timer == NGX_TIMER_INFINITE) {
|
|
247 tp = NULL;
|
|
248
|
|
249 } else {
|
106
|
250 tv.tv_sec = (long) (timer / 1000);
|
|
251 tv.tv_usec = (long) ((timer % 1000) * 1000);
|
0
|
252 tp = &tv;
|
|
253 }
|
|
254
|
|
255 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
106
|
256 "select timer: %M", timer);
|
0
|
257
|
|
258 work_read_fd_set = master_read_fd_set;
|
|
259 work_write_fd_set = master_write_fd_set;
|
|
260
|
|
261 ready = select(max_fd + 1, &work_read_fd_set, &work_write_fd_set, NULL, tp);
|
112
|
262
|
529
|
263 err = (ready == -1) ? ngx_errno : 0;
|
0
|
264
|
579
|
265 if (flags & NGX_UPDATE_TIME || ngx_event_timer_alarm) {
|
|
266 ngx_time_update();
|
112
|
267 }
|
0
|
268
|
|
269 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
270 "select ready %d", ready);
|
|
271
|
112
|
272 if (err) {
|
356
|
273 ngx_uint_t level;
|
|
274
|
112
|
275 if (err == NGX_EINTR) {
|
|
276
|
|
277 if (ngx_event_timer_alarm) {
|
|
278 ngx_event_timer_alarm = 0;
|
|
279 return NGX_OK;
|
|
280 }
|
126
|
281
|
112
|
282 level = NGX_LOG_INFO;
|
126
|
283
|
|
284 } else {
|
112
|
285 level = NGX_LOG_ALERT;
|
|
286 }
|
|
287
|
|
288 ngx_log_error(level, cycle->log, err, "select() failed");
|
493
|
289
|
|
290 if (err == EBADF) {
|
|
291 ngx_select_repair_fd_sets(cycle);
|
|
292 }
|
|
293
|
0
|
294 return NGX_ERROR;
|
|
295 }
|
|
296
|
116
|
297 if (ready == 0) {
|
|
298 if (timer != NGX_TIMER_INFINITE) {
|
|
299 return NGX_OK;
|
|
300 }
|
|
301
|
|
302 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
303 "select() returned no events without timeout");
|
|
304 return NGX_ERROR;
|
112
|
305 }
|
|
306
|
|
307 ngx_mutex_lock(ngx_posted_events_mutex);
|
|
308
|
0
|
309 nready = 0;
|
|
310
|
|
311 for (i = 0; i < nevents; i++) {
|
|
312 ev = event_index[i];
|
|
313 c = ev->data;
|
|
314 found = 0;
|
|
315
|
|
316 if (ev->write) {
|
|
317 if (FD_ISSET(c->fd, &work_write_fd_set)) {
|
|
318 found = 1;
|
|
319 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
320 "select write %d", c->fd);
|
|
321 }
|
|
322
|
|
323 } else {
|
|
324 if (FD_ISSET(c->fd, &work_read_fd_set)) {
|
|
325 found = 1;
|
|
326 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
327 "select read %d", c->fd);
|
|
328 }
|
|
329 }
|
|
330
|
|
331 if (found) {
|
|
332 ev->ready = 1;
|
|
333
|
112
|
334 queue = (ngx_event_t **) (ev->accept ? &ngx_posted_accept_events:
|
|
335 &ngx_posted_events);
|
126
|
336 ngx_locked_post_event(ev, queue);
|
0
|
337
|
|
338 nready++;
|
|
339 }
|
|
340 }
|
|
341
|
112
|
342 ngx_mutex_unlock(ngx_posted_events_mutex);
|
0
|
343
|
|
344 if (ready != nready) {
|
493
|
345 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
346 "select ready != events: %d:%d", ready, nready);
|
|
347
|
|
348 ngx_select_repair_fd_sets(cycle);
|
0
|
349 }
|
|
350
|
|
351 return NGX_OK;
|
|
352 }
|
|
353
|
|
354
|
493
|
355 static void
|
|
356 ngx_select_repair_fd_sets(ngx_cycle_t *cycle)
|
|
357 {
|
|
358 int n;
|
|
359 socklen_t len;
|
|
360 ngx_err_t err;
|
|
361 ngx_socket_t s;
|
|
362
|
|
363 for (s = 0; s <= max_fd; s++) {
|
|
364
|
|
365 if (FD_ISSET(s, &master_read_fd_set) == 0) {
|
|
366 continue;
|
|
367 }
|
|
368
|
|
369 len = sizeof(int);
|
|
370
|
|
371 if (getsockopt(s, SOL_SOCKET, SO_TYPE, &n, &len) == -1) {
|
|
372 err = ngx_socket_errno;
|
|
373
|
|
374 ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
|
|
375 "invalid descriptor #%d in read fd_set", s);
|
|
376
|
|
377 FD_CLR(s, &master_read_fd_set);
|
|
378 }
|
|
379 }
|
|
380
|
|
381 for (s = 0; s <= max_fd; s++) {
|
|
382
|
|
383 if (FD_ISSET(s, &master_write_fd_set) == 0) {
|
|
384 continue;
|
|
385 }
|
|
386
|
|
387 len = sizeof(int);
|
|
388
|
|
389 if (getsockopt(s, SOL_SOCKET, SO_TYPE, &n, &len) == -1) {
|
|
390 err = ngx_socket_errno;
|
|
391
|
|
392 ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
|
|
393 "invalid descriptor #%d in write fd_set", s);
|
|
394
|
|
395 FD_CLR(s, &master_write_fd_set);
|
|
396 }
|
|
397 }
|
|
398
|
|
399 max_fd = -1;
|
|
400 }
|
|
401
|
|
402
|
50
|
403 static char *
|
|
404 ngx_select_init_conf(ngx_cycle_t *cycle, void *conf)
|
0
|
405 {
|
|
406 ngx_event_conf_t *ecf;
|
|
407
|
|
408 ecf = ngx_event_get_conf(cycle->conf_ctx, ngx_event_core_module);
|
|
409
|
|
410 if (ecf->use != ngx_select_module.ctx_index) {
|
|
411 return NGX_CONF_OK;
|
|
412 }
|
|
413
|
|
414 /* disable warning: the default FD_SETSIZE is 1024U in FreeBSD 5.x */
|
|
415
|
384
|
416 if (cycle->connection_n > FD_SETSIZE) {
|
0
|
417 ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
|
|
418 "the maximum number of files "
|
384
|
419 "supported by select() is %ud", FD_SETSIZE);
|
0
|
420 return NGX_CONF_ERROR;
|
|
421 }
|
112
|
422
|
497
|
423 #if (NGX_THREADS)
|
112
|
424
|
0
|
425 ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
|
|
426 "select() is not supported in the threaded mode");
|
|
427 return NGX_CONF_ERROR;
|
112
|
428
|
0
|
429 #else
|
112
|
430
|
0
|
431 return NGX_CONF_OK;
|
112
|
432
|
0
|
433 #endif
|
|
434 }
|