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