|
0
|
1
|
|
|
2 /*
|
|
|
3 * Copyright (C) Igor Sysoev
|
|
660
|
4 * Copyright (C) Nginx, Inc.
|
|
0
|
5 */
|
|
|
6
|
|
|
7
|
|
|
8 #include <ngx_config.h>
|
|
|
9 #include <ngx_core.h>
|
|
|
10 #include <ngx_event.h>
|
|
|
11
|
|
|
12
|
|
112
|
13 static ngx_int_t ngx_select_init(ngx_cycle_t *cycle, ngx_msec_t timer);
|
|
0
|
14 static void ngx_select_done(ngx_cycle_t *cycle);
|
|
324
|
15 static ngx_int_t ngx_select_add_event(ngx_event_t *ev, ngx_int_t event,
|
|
|
16 ngx_uint_t flags);
|
|
|
17 static ngx_int_t ngx_select_del_event(ngx_event_t *ev, ngx_int_t event,
|
|
|
18 ngx_uint_t flags);
|
|
112
|
19 static ngx_int_t ngx_select_process_events(ngx_cycle_t *cycle, ngx_msec_t timer,
|
|
|
20 ngx_uint_t flags);
|
|
484
|
21 static void ngx_select_repair_fd_sets(ngx_cycle_t *cycle);
|
|
0
|
22 static char *ngx_select_init_conf(ngx_cycle_t *cycle, void *conf);
|
|
|
23
|
|
|
24
|
|
|
25 static fd_set master_read_fd_set;
|
|
|
26 static fd_set master_write_fd_set;
|
|
|
27 static fd_set work_read_fd_set;
|
|
|
28 static fd_set work_write_fd_set;
|
|
|
29
|
|
324
|
30 static ngx_int_t max_fd;
|
|
0
|
31 static ngx_uint_t nevents;
|
|
|
32
|
|
|
33 static ngx_event_t **event_index;
|
|
|
34
|
|
|
35
|
|
|
36 static ngx_str_t select_name = ngx_string("select");
|
|
|
37
|
|
|
38 ngx_event_module_t ngx_select_module_ctx = {
|
|
|
39 &select_name,
|
|
|
40 NULL, /* create configuration */
|
|
|
41 ngx_select_init_conf, /* init configuration */
|
|
|
42
|
|
|
43 {
|
|
|
44 ngx_select_add_event, /* add an event */
|
|
|
45 ngx_select_del_event, /* delete an event */
|
|
|
46 ngx_select_add_event, /* enable an event */
|
|
|
47 ngx_select_del_event, /* disable an event */
|
|
|
48 NULL, /* add an connection */
|
|
|
49 NULL, /* delete an connection */
|
|
|
50 NULL, /* process the changes */
|
|
|
51 ngx_select_process_events, /* process the events */
|
|
|
52 ngx_select_init, /* init the events */
|
|
|
53 ngx_select_done /* done the events */
|
|
|
54 }
|
|
|
55
|
|
|
56 };
|
|
|
57
|
|
|
58 ngx_module_t ngx_select_module = {
|
|
58
|
59 NGX_MODULE_V1,
|
|
0
|
60 &ngx_select_module_ctx, /* module context */
|
|
|
61 NULL, /* module directives */
|
|
|
62 NGX_EVENT_MODULE, /* module type */
|
|
90
|
63 NULL, /* init master */
|
|
0
|
64 NULL, /* init module */
|
|
90
|
65 NULL, /* init process */
|
|
|
66 NULL, /* init thread */
|
|
|
67 NULL, /* exit thread */
|
|
|
68 NULL, /* exit process */
|
|
|
69 NULL, /* exit master */
|
|
|
70 NGX_MODULE_V1_PADDING
|
|
0
|
71 };
|
|
|
72
|
|
|
73
|
|
50
|
74 static ngx_int_t
|
|
112
|
75 ngx_select_init(ngx_cycle_t *cycle, ngx_msec_t timer)
|
|
0
|
76 {
|
|
|
77 ngx_event_t **index;
|
|
|
78
|
|
|
79 if (event_index == NULL) {
|
|
|
80 FD_ZERO(&master_read_fd_set);
|
|
|
81 FD_ZERO(&master_write_fd_set);
|
|
|
82 nevents = 0;
|
|
|
83 }
|
|
|
84
|
|
552
|
85 if (ngx_process >= NGX_PROCESS_WORKER
|
|
0
|
86 || cycle->old_cycle == NULL
|
|
|
87 || cycle->old_cycle->connection_n < cycle->connection_n)
|
|
|
88 {
|
|
50
|
89 index = ngx_alloc(sizeof(ngx_event_t *) * 2 * cycle->connection_n,
|
|
|
90 cycle->log);
|
|
|
91 if (index == NULL) {
|
|
|
92 return NGX_ERROR;
|
|
|
93 }
|
|
0
|
94
|
|
|
95 if (event_index) {
|
|
|
96 ngx_memcpy(index, event_index, sizeof(ngx_event_t *) * nevents);
|
|
|
97 ngx_free(event_index);
|
|
|
98 }
|
|
112
|
99
|
|
0
|
100 event_index = index;
|
|
|
101 }
|
|
|
102
|
|
|
103 ngx_io = ngx_os_io;
|
|
|
104
|
|
|
105 ngx_event_actions = ngx_select_module_ctx.actions;
|
|
|
106
|
|
112
|
107 ngx_event_flags = NGX_USE_LEVEL_EVENT;
|
|
0
|
108
|
|
|
109 max_fd = -1;
|
|
|
110
|
|
|
111 return NGX_OK;
|
|
|
112 }
|
|
|
113
|
|
|
114
|
|
50
|
115 static void
|
|
|
116 ngx_select_done(ngx_cycle_t *cycle)
|
|
0
|
117 {
|
|
|
118 ngx_free(event_index);
|
|
|
119
|
|
|
120 event_index = NULL;
|
|
|
121 }
|
|
|
122
|
|
|
123
|
|
50
|
124 static ngx_int_t
|
|
324
|
125 ngx_select_add_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags)
|
|
0
|
126 {
|
|
|
127 ngx_connection_t *c;
|
|
|
128
|
|
|
129 c = ev->data;
|
|
|
130
|
|
|
131 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
|
|
324
|
132 "select add event fd:%d ev:%i", c->fd, event);
|
|
0
|
133
|
|
|
134 if (ev->index != NGX_INVALID_INDEX) {
|
|
|
135 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
|
|
324
|
136 "select event fd:%d ev:%i is already set", c->fd, event);
|
|
0
|
137 return NGX_OK;
|
|
|
138 }
|
|
|
139
|
|
486
|
140 if ((event == NGX_READ_EVENT && ev->write)
|
|
|
141 || (event == NGX_WRITE_EVENT && !ev->write))
|
|
|
142 {
|
|
|
143 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
|
|
|
144 "invalid select %s event fd:%d ev:%i",
|
|
|
145 ev->write ? "write" : "read", c->fd, event);
|
|
|
146 return NGX_ERROR;
|
|
|
147 }
|
|
|
148
|
|
0
|
149 if (event == NGX_READ_EVENT) {
|
|
|
150 FD_SET(c->fd, &master_read_fd_set);
|
|
|
151
|
|
|
152 } else if (event == NGX_WRITE_EVENT) {
|
|
|
153 FD_SET(c->fd, &master_write_fd_set);
|
|
|
154 }
|
|
|
155
|
|
|
156 if (max_fd != -1 && max_fd < c->fd) {
|
|
|
157 max_fd = c->fd;
|
|
|
158 }
|
|
|
159
|
|
|
160 ev->active = 1;
|
|
|
161
|
|
|
162 event_index[nevents] = ev;
|
|
|
163 ev->index = nevents;
|
|
|
164 nevents++;
|
|
|
165
|
|
|
166 return NGX_OK;
|
|
|
167 }
|
|
|
168
|
|
|
169
|
|
50
|
170 static ngx_int_t
|
|
324
|
171 ngx_select_del_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags)
|
|
0
|
172 {
|
|
486
|
173 ngx_event_t *e;
|
|
0
|
174 ngx_connection_t *c;
|
|
|
175
|
|
|
176 c = ev->data;
|
|
|
177
|
|
|
178 ev->active = 0;
|
|
|
179
|
|
|
180 if (ev->index == NGX_INVALID_INDEX) {
|
|
|
181 return NGX_OK;
|
|
|
182 }
|
|
|
183
|
|
|
184 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
|
|
324
|
185 "select del event fd:%d ev:%i", c->fd, event);
|
|
0
|
186
|
|
|
187 if (event == NGX_READ_EVENT) {
|
|
|
188 FD_CLR(c->fd, &master_read_fd_set);
|
|
|
189
|
|
|
190 } else if (event == NGX_WRITE_EVENT) {
|
|
|
191 FD_CLR(c->fd, &master_write_fd_set);
|
|
|
192 }
|
|
|
193
|
|
|
194 if (max_fd == c->fd) {
|
|
|
195 max_fd = -1;
|
|
|
196 }
|
|
|
197
|
|
324
|
198 if (ev->index < --nevents) {
|
|
486
|
199 e = event_index[nevents];
|
|
|
200 event_index[ev->index] = e;
|
|
|
201 e->index = ev->index;
|
|
0
|
202 }
|
|
|
203
|
|
|
204 ev->index = NGX_INVALID_INDEX;
|
|
|
205
|
|
|
206 return NGX_OK;
|
|
|
207 }
|
|
|
208
|
|
|
209
|
|
50
|
210 static ngx_int_t
|
|
112
|
211 ngx_select_process_events(ngx_cycle_t *cycle, ngx_msec_t timer,
|
|
|
212 ngx_uint_t flags)
|
|
0
|
213 {
|
|
484
|
214 int ready, nready;
|
|
|
215 ngx_err_t err;
|
|
|
216 ngx_uint_t i, found;
|
|
|
217 ngx_event_t *ev, **queue;
|
|
|
218 struct timeval tv, *tp;
|
|
|
219 ngx_connection_t *c;
|
|
0
|
220
|
|
|
221 if (max_fd == -1) {
|
|
|
222 for (i = 0; i < nevents; i++) {
|
|
|
223 c = event_index[i]->data;
|
|
|
224 if (max_fd < c->fd) {
|
|
|
225 max_fd = c->fd;
|
|
|
226 }
|
|
|
227 }
|
|
|
228
|
|
|
229 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
|
230 "change max_fd: %d", max_fd);
|
|
|
231 }
|
|
|
232
|
|
|
233 #if (NGX_DEBUG)
|
|
|
234 if (cycle->log->log_level & NGX_LOG_DEBUG_ALL) {
|
|
|
235 for (i = 0; i < nevents; i++) {
|
|
|
236 ev = event_index[i];
|
|
|
237 c = ev->data;
|
|
|
238 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
|
239 "select event: fd:%d wr:%d", c->fd, ev->write);
|
|
|
240 }
|
|
|
241
|
|
|
242 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
|
243 "max_fd: %d", max_fd);
|
|
|
244 }
|
|
|
245 #endif
|
|
|
246
|
|
|
247 if (timer == NGX_TIMER_INFINITE) {
|
|
|
248 tp = NULL;
|
|
|
249
|
|
|
250 } else {
|
|
106
|
251 tv.tv_sec = (long) (timer / 1000);
|
|
|
252 tv.tv_usec = (long) ((timer % 1000) * 1000);
|
|
0
|
253 tp = &tv;
|
|
|
254 }
|
|
|
255
|
|
|
256 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
106
|
257 "select timer: %M", timer);
|
|
0
|
258
|
|
|
259 work_read_fd_set = master_read_fd_set;
|
|
|
260 work_write_fd_set = master_write_fd_set;
|
|
|
261
|
|
|
262 ready = select(max_fd + 1, &work_read_fd_set, &work_write_fd_set, NULL, tp);
|
|
112
|
263
|
|
518
|
264 err = (ready == -1) ? ngx_errno : 0;
|
|
0
|
265
|
|
566
|
266 if (flags & NGX_UPDATE_TIME || ngx_event_timer_alarm) {
|
|
|
267 ngx_time_update();
|
|
112
|
268 }
|
|
0
|
269
|
|
|
270 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
|
271 "select ready %d", ready);
|
|
|
272
|
|
112
|
273 if (err) {
|
|
356
|
274 ngx_uint_t level;
|
|
|
275
|
|
112
|
276 if (err == NGX_EINTR) {
|
|
|
277
|
|
|
278 if (ngx_event_timer_alarm) {
|
|
|
279 ngx_event_timer_alarm = 0;
|
|
|
280 return NGX_OK;
|
|
|
281 }
|
|
126
|
282
|
|
112
|
283 level = NGX_LOG_INFO;
|
|
126
|
284
|
|
|
285 } else {
|
|
112
|
286 level = NGX_LOG_ALERT;
|
|
|
287 }
|
|
|
288
|
|
|
289 ngx_log_error(level, cycle->log, err, "select() failed");
|
|
484
|
290
|
|
|
291 if (err == EBADF) {
|
|
|
292 ngx_select_repair_fd_sets(cycle);
|
|
|
293 }
|
|
|
294
|
|
0
|
295 return NGX_ERROR;
|
|
|
296 }
|
|
|
297
|
|
116
|
298 if (ready == 0) {
|
|
|
299 if (timer != NGX_TIMER_INFINITE) {
|
|
|
300 return NGX_OK;
|
|
|
301 }
|
|
|
302
|
|
|
303 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
|
304 "select() returned no events without timeout");
|
|
|
305 return NGX_ERROR;
|
|
112
|
306 }
|
|
|
307
|
|
|
308 ngx_mutex_lock(ngx_posted_events_mutex);
|
|
|
309
|
|
0
|
310 nready = 0;
|
|
|
311
|
|
|
312 for (i = 0; i < nevents; i++) {
|
|
|
313 ev = event_index[i];
|
|
|
314 c = ev->data;
|
|
|
315 found = 0;
|
|
|
316
|
|
|
317 if (ev->write) {
|
|
|
318 if (FD_ISSET(c->fd, &work_write_fd_set)) {
|
|
|
319 found = 1;
|
|
|
320 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
|
321 "select write %d", c->fd);
|
|
|
322 }
|
|
|
323
|
|
|
324 } else {
|
|
|
325 if (FD_ISSET(c->fd, &work_read_fd_set)) {
|
|
|
326 found = 1;
|
|
|
327 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
|
328 "select read %d", c->fd);
|
|
|
329 }
|
|
|
330 }
|
|
|
331
|
|
|
332 if (found) {
|
|
|
333 ev->ready = 1;
|
|
|
334
|
|
112
|
335 queue = (ngx_event_t **) (ev->accept ? &ngx_posted_accept_events:
|
|
|
336 &ngx_posted_events);
|
|
126
|
337 ngx_locked_post_event(ev, queue);
|
|
0
|
338
|
|
|
339 nready++;
|
|
|
340 }
|
|
|
341 }
|
|
|
342
|
|
112
|
343 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
0
|
344
|
|
|
345 if (ready != nready) {
|
|
484
|
346 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
|
347 "select ready != events: %d:%d", ready, nready);
|
|
|
348
|
|
|
349 ngx_select_repair_fd_sets(cycle);
|
|
0
|
350 }
|
|
|
351
|
|
|
352 return NGX_OK;
|
|
|
353 }
|
|
|
354
|
|
|
355
|
|
484
|
356 static void
|
|
|
357 ngx_select_repair_fd_sets(ngx_cycle_t *cycle)
|
|
|
358 {
|
|
|
359 int n;
|
|
|
360 socklen_t len;
|
|
|
361 ngx_err_t err;
|
|
|
362 ngx_socket_t s;
|
|
|
363
|
|
|
364 for (s = 0; s <= max_fd; s++) {
|
|
|
365
|
|
|
366 if (FD_ISSET(s, &master_read_fd_set) == 0) {
|
|
|
367 continue;
|
|
|
368 }
|
|
|
369
|
|
|
370 len = sizeof(int);
|
|
|
371
|
|
|
372 if (getsockopt(s, SOL_SOCKET, SO_TYPE, &n, &len) == -1) {
|
|
|
373 err = ngx_socket_errno;
|
|
|
374
|
|
|
375 ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
|
|
|
376 "invalid descriptor #%d in read fd_set", s);
|
|
|
377
|
|
|
378 FD_CLR(s, &master_read_fd_set);
|
|
|
379 }
|
|
|
380 }
|
|
|
381
|
|
|
382 for (s = 0; s <= max_fd; s++) {
|
|
|
383
|
|
|
384 if (FD_ISSET(s, &master_write_fd_set) == 0) {
|
|
|
385 continue;
|
|
|
386 }
|
|
|
387
|
|
|
388 len = sizeof(int);
|
|
|
389
|
|
|
390 if (getsockopt(s, SOL_SOCKET, SO_TYPE, &n, &len) == -1) {
|
|
|
391 err = ngx_socket_errno;
|
|
|
392
|
|
|
393 ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
|
|
|
394 "invalid descriptor #%d in write fd_set", s);
|
|
|
395
|
|
|
396 FD_CLR(s, &master_write_fd_set);
|
|
|
397 }
|
|
|
398 }
|
|
|
399
|
|
|
400 max_fd = -1;
|
|
|
401 }
|
|
|
402
|
|
|
403
|
|
50
|
404 static char *
|
|
|
405 ngx_select_init_conf(ngx_cycle_t *cycle, void *conf)
|
|
0
|
406 {
|
|
|
407 ngx_event_conf_t *ecf;
|
|
|
408
|
|
|
409 ecf = ngx_event_get_conf(cycle->conf_ctx, ngx_event_core_module);
|
|
|
410
|
|
|
411 if (ecf->use != ngx_select_module.ctx_index) {
|
|
|
412 return NGX_CONF_OK;
|
|
|
413 }
|
|
|
414
|
|
|
415 /* disable warning: the default FD_SETSIZE is 1024U in FreeBSD 5.x */
|
|
|
416
|
|
384
|
417 if (cycle->connection_n > FD_SETSIZE) {
|
|
0
|
418 ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
|
|
|
419 "the maximum number of files "
|
|
384
|
420 "supported by select() is %ud", FD_SETSIZE);
|
|
0
|
421 return NGX_CONF_ERROR;
|
|
|
422 }
|
|
112
|
423
|
|
488
|
424 #if (NGX_THREADS)
|
|
112
|
425
|
|
0
|
426 ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
|
|
|
427 "select() is not supported in the threaded mode");
|
|
|
428 return NGX_CONF_ERROR;
|
|
112
|
429
|
|
0
|
430 #else
|
|
112
|
431
|
|
0
|
432 return NGX_CONF_OK;
|
|
112
|
433
|
|
0
|
434 #endif
|
|
|
435 }
|
