|
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_RTSIG)
|
|
0
|
13
|
|
|
14 #define F_SETSIG 10
|
|
|
15 #define SIGRTMIN 33
|
|
|
16 #define si_fd __spare__[0]
|
|
|
17 #define KERN_RTSIGNR 30
|
|
|
18 #define KERN_RTSIGMAX 31
|
|
|
19
|
|
|
20 int sigtimedwait(const sigset_t *set, siginfo_t *info,
|
|
|
21 const struct timespec *timeout)
|
|
|
22 {
|
|
|
23 return -1;
|
|
|
24 }
|
|
|
25
|
|
|
26 int ngx_linux_rtsig_max;
|
|
|
27
|
|
|
28 #endif
|
|
|
29
|
|
|
30
|
|
|
31 typedef struct {
|
|
|
32 int signo;
|
|
|
33 ngx_int_t overflow_events;
|
|
|
34 ngx_int_t overflow_test;
|
|
|
35 ngx_int_t overflow_threshold;
|
|
|
36 } ngx_rtsig_conf_t;
|
|
|
37
|
|
|
38
|
|
|
39 extern ngx_event_module_t ngx_poll_module_ctx;
|
|
|
40
|
|
|
41 static ngx_int_t ngx_rtsig_init(ngx_cycle_t *cycle);
|
|
|
42 static void ngx_rtsig_done(ngx_cycle_t *cycle);
|
|
|
43 static ngx_int_t ngx_rtsig_add_connection(ngx_connection_t *c);
|
|
|
44 static ngx_int_t ngx_rtsig_del_connection(ngx_connection_t *c, u_int flags);
|
|
|
45 static ngx_int_t ngx_rtsig_process_events(ngx_cycle_t *cycle);
|
|
|
46 static ngx_int_t ngx_rtsig_process_overflow(ngx_cycle_t *cycle);
|
|
|
47
|
|
|
48 static void *ngx_rtsig_create_conf(ngx_cycle_t *cycle);
|
|
|
49 static char *ngx_rtsig_init_conf(ngx_cycle_t *cycle, void *conf);
|
|
|
50 static char *ngx_check_ngx_overflow_threshold_bounds(ngx_conf_t *cf,
|
|
|
51 void *post, void *data);
|
|
|
52
|
|
|
53
|
|
|
54 static sigset_t set;
|
|
|
55 static ngx_uint_t overflow, overflow_current;
|
|
|
56 static struct pollfd *overflow_list;
|
|
|
57
|
|
|
58
|
|
|
59 static ngx_str_t rtsig_name = ngx_string("rtsig");
|
|
|
60
|
|
|
61 static ngx_conf_num_bounds_t ngx_overflow_threshold_bounds = {
|
|
|
62 ngx_check_ngx_overflow_threshold_bounds, 2, 10
|
|
|
63 };
|
|
|
64
|
|
|
65
|
|
|
66 static ngx_command_t ngx_rtsig_commands[] = {
|
|
|
67
|
|
|
68 {ngx_string("rtsig_signo"),
|
|
|
69 NGX_EVENT_CONF|NGX_CONF_TAKE1,
|
|
|
70 ngx_conf_set_num_slot,
|
|
|
71 0,
|
|
|
72 offsetof(ngx_rtsig_conf_t, signo),
|
|
|
73 NULL},
|
|
|
74
|
|
|
75 {ngx_string("rtsig_overflow_events"),
|
|
|
76 NGX_EVENT_CONF|NGX_CONF_TAKE1,
|
|
|
77 ngx_conf_set_num_slot,
|
|
|
78 0,
|
|
|
79 offsetof(ngx_rtsig_conf_t, overflow_events),
|
|
|
80 NULL},
|
|
|
81
|
|
|
82 {ngx_string("rtsig_overflow_test"),
|
|
|
83 NGX_EVENT_CONF|NGX_CONF_TAKE1,
|
|
|
84 ngx_conf_set_num_slot,
|
|
|
85 0,
|
|
|
86 offsetof(ngx_rtsig_conf_t, overflow_test),
|
|
|
87 NULL},
|
|
|
88
|
|
|
89 {ngx_string("rtsig_overflow_threshold"),
|
|
|
90 NGX_EVENT_CONF|NGX_CONF_TAKE1,
|
|
|
91 ngx_conf_set_num_slot,
|
|
|
92 0,
|
|
|
93 offsetof(ngx_rtsig_conf_t, overflow_threshold),
|
|
|
94 &ngx_overflow_threshold_bounds},
|
|
|
95
|
|
|
96 ngx_null_command
|
|
|
97 };
|
|
|
98
|
|
|
99
|
|
|
100 ngx_event_module_t ngx_rtsig_module_ctx = {
|
|
|
101 &rtsig_name,
|
|
|
102 ngx_rtsig_create_conf, /* create configuration */
|
|
|
103 ngx_rtsig_init_conf, /* init configuration */
|
|
|
104
|
|
|
105 {
|
|
|
106 NULL, /* add an event */
|
|
|
107 NULL, /* delete an event */
|
|
|
108 NULL, /* enable an event */
|
|
|
109 NULL, /* disable an event */
|
|
|
110 ngx_rtsig_add_connection, /* add an connection */
|
|
|
111 ngx_rtsig_del_connection, /* delete an connection */
|
|
|
112 NULL, /* process the changes */
|
|
|
113 ngx_rtsig_process_events, /* process the events */
|
|
|
114 ngx_rtsig_init, /* init the events */
|
|
|
115 ngx_rtsig_done, /* done the events */
|
|
|
116 }
|
|
|
117
|
|
|
118 };
|
|
|
119
|
|
|
120 ngx_module_t ngx_rtsig_module = {
|
|
|
121 NGX_MODULE,
|
|
|
122 &ngx_rtsig_module_ctx, /* module context */
|
|
|
123 ngx_rtsig_commands, /* module directives */
|
|
|
124 NGX_EVENT_MODULE, /* module type */
|
|
|
125 NULL, /* init module */
|
|
|
126 NULL /* init process */
|
|
|
127 };
|
|
|
128
|
|
|
129
|
|
|
130 static ngx_int_t ngx_rtsig_init(ngx_cycle_t *cycle)
|
|
|
131 {
|
|
|
132 ngx_rtsig_conf_t *rtscf;
|
|
|
133
|
|
|
134 rtscf = ngx_event_get_conf(cycle->conf_ctx, ngx_rtsig_module);
|
|
|
135
|
|
|
136 sigemptyset(&set);
|
|
|
137 sigaddset(&set, rtscf->signo);
|
|
|
138 sigaddset(&set, rtscf->signo + 1);
|
|
|
139 sigaddset(&set, SIGIO);
|
|
|
140
|
|
|
141 if (sigprocmask(SIG_BLOCK, &set, NULL) == -1) {
|
|
|
142 ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
|
|
|
143 "sigprocmask() failed");
|
|
|
144 return NGX_ERROR;
|
|
|
145 }
|
|
|
146
|
|
|
147 if (overflow_list) {
|
|
|
148 ngx_free(overflow_list);
|
|
|
149 }
|
|
|
150
|
|
|
151 overflow_list = ngx_alloc(sizeof(struct pollfd) * rtscf->overflow_events,
|
|
|
152 cycle->log);
|
|
|
153 if (overflow_list == NULL) {
|
|
|
154 return NGX_ERROR;
|
|
|
155 }
|
|
|
156
|
|
|
157 ngx_io = ngx_os_io;
|
|
|
158
|
|
|
159 ngx_event_actions = ngx_rtsig_module_ctx.actions;
|
|
|
160
|
|
4
|
161 ngx_event_flags = NGX_USE_RTSIG_EVENT|NGX_USE_GREEDY_EVENT;
|
|
0
|
162
|
|
|
163 return NGX_OK;
|
|
|
164 }
|
|
|
165
|
|
|
166
|
|
|
167 static void ngx_rtsig_done(ngx_cycle_t *cycle)
|
|
|
168 {
|
|
2
|
169 ngx_free(overflow_list);
|
|
|
170
|
|
|
171 overflow_list = NULL;
|
|
0
|
172 }
|
|
|
173
|
|
|
174
|
|
|
175 static ngx_int_t ngx_rtsig_add_connection(ngx_connection_t *c)
|
|
|
176 {
|
|
|
177 int signo;
|
|
|
178 ngx_rtsig_conf_t *rtscf;
|
|
|
179
|
|
|
180 if (c->read->accept && c->read->disabled) {
|
|
|
181
|
|
|
182 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
|
|
|
183 "rtsig enable connection: fd:%d", c->fd);
|
|
|
184
|
|
|
185 if (fcntl(c->fd, F_SETOWN, ngx_pid) == -1) {
|
|
|
186 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
|
|
|
187 "fcntl(F_SETOWN) failed");
|
|
|
188 return NGX_ERROR;
|
|
|
189 }
|
|
|
190
|
|
|
191 c->read->active = 1;
|
|
|
192 c->read->disabled = 0;
|
|
|
193 }
|
|
|
194
|
|
|
195 rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
|
|
|
196
|
|
|
197 signo = rtscf->signo + c->read->instance;
|
|
|
198
|
|
|
199 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
|
|
|
200 "rtsig add connection: fd:%d signo:%d", c->fd, signo);
|
|
|
201
|
|
|
202 if (fcntl(c->fd, F_SETFL, O_RDWR|O_NONBLOCK|O_ASYNC) == -1) {
|
|
|
203 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
|
|
|
204 "fcntl(O_RDWR|O_NONBLOCK|O_ASYNC) failed");
|
|
|
205 return NGX_ERROR;
|
|
|
206 }
|
|
|
207
|
|
|
208 if (fcntl(c->fd, F_SETSIG, signo) == -1) {
|
|
|
209 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
|
|
|
210 "fcntl(F_SETSIG) failed");
|
|
|
211 return NGX_ERROR;
|
|
|
212 }
|
|
|
213
|
|
|
214 if (fcntl(c->fd, F_SETOWN, ngx_pid) == -1) {
|
|
|
215 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
|
|
|
216 "fcntl(F_SETOWN) failed");
|
|
|
217 return NGX_ERROR;
|
|
|
218 }
|
|
|
219
|
|
18
|
220 #if (NGX_HAVE_ONESIGFD)
|
|
0
|
221 if (fcntl(c->fd, F_SETAUXFL, O_ONESIGFD) == -1) {
|
|
|
222 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
|
|
|
223 "fcntl(F_SETAUXFL) failed");
|
|
|
224 return NGX_ERROR;
|
|
|
225 }
|
|
|
226 #endif
|
|
|
227
|
|
|
228 c->read->active = 1;
|
|
|
229 c->write->active = 1;
|
|
|
230
|
|
|
231 return NGX_OK;
|
|
|
232 }
|
|
|
233
|
|
|
234
|
|
|
235 static ngx_int_t ngx_rtsig_del_connection(ngx_connection_t *c, u_int flags)
|
|
|
236 {
|
|
|
237 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
|
|
|
238 "rtsig del connection: fd:%d", c->fd);
|
|
|
239
|
|
|
240 if ((flags & NGX_DISABLE_EVENT) && c->read->accept) {
|
|
|
241
|
|
|
242 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
|
|
|
243 "rtsig disable connection: fd:%d", c->fd);
|
|
|
244
|
|
|
245 c->read->active = 0;
|
|
|
246 c->read->disabled = 1;
|
|
|
247 return NGX_OK;
|
|
|
248 }
|
|
|
249
|
|
|
250 if (flags & NGX_CLOSE_EVENT) {
|
|
|
251 c->read->active = 0;
|
|
|
252 c->write->active = 0;
|
|
|
253 return NGX_OK;
|
|
|
254 }
|
|
|
255
|
|
|
256 if (fcntl(c->fd, F_SETFL, O_RDWR|O_NONBLOCK) == -1) {
|
|
|
257 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
|
|
|
258 "fcntl(O_RDWR|O_NONBLOCK) failed");
|
|
|
259 return NGX_ERROR;
|
|
|
260 }
|
|
|
261
|
|
|
262 c->read->active = 0;
|
|
|
263 c->write->active = 0;
|
|
|
264
|
|
|
265 return NGX_OK;
|
|
|
266 }
|
|
|
267
|
|
|
268
|
|
|
269 ngx_int_t ngx_rtsig_process_events(ngx_cycle_t *cycle)
|
|
|
270 {
|
|
|
271 int signo;
|
|
|
272 ngx_int_t instance, i;
|
|
|
273 ngx_uint_t expire;
|
|
|
274 size_t n;
|
|
|
275 ngx_msec_t timer;
|
|
|
276 ngx_err_t err;
|
|
|
277 siginfo_t si;
|
|
|
278 ngx_event_t *rev, *wev;
|
|
|
279 struct timeval tv;
|
|
|
280 struct timespec ts, *tp;
|
|
|
281 struct sigaction sa;
|
|
|
282 ngx_epoch_msec_t delta;
|
|
|
283 ngx_connection_t *c;
|
|
|
284 ngx_rtsig_conf_t *rtscf;
|
|
|
285
|
|
|
286 if (overflow) {
|
|
|
287 timer = 0;
|
|
|
288 expire = 0;
|
|
|
289
|
|
|
290 } else {
|
|
|
291 for ( ;; ) {
|
|
|
292 timer = ngx_event_find_timer();
|
|
|
293
|
|
|
294 #if (NGX_THREADS)
|
|
|
295
|
|
|
296 if (timer == NGX_TIMER_ERROR) {
|
|
|
297 return NGX_ERROR;
|
|
|
298 }
|
|
|
299
|
|
|
300 if (timer == NGX_TIMER_INFINITE || timer > 500) {
|
|
|
301 timer = 500;
|
|
|
302 break;
|
|
|
303 }
|
|
|
304
|
|
|
305 #endif
|
|
|
306
|
|
|
307 if (timer != 0) {
|
|
|
308 break;
|
|
|
309 }
|
|
|
310
|
|
|
311 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
|
312 "rtsig expired timer");
|
|
|
313
|
|
|
314 ngx_event_expire_timers((ngx_msec_t)
|
|
|
315 (ngx_elapsed_msec - ngx_old_elapsed_msec));
|
|
|
316
|
|
|
317 if (ngx_posted_events && ngx_threaded) {
|
|
|
318 ngx_wakeup_worker_thread(cycle);
|
|
|
319 }
|
|
|
320 }
|
|
|
321
|
|
|
322 expire = 1;
|
|
|
323
|
|
|
324 if (ngx_accept_mutex) {
|
|
|
325 if (ngx_accept_disabled > 0) {
|
|
|
326 ngx_accept_disabled--;
|
|
|
327
|
|
|
328 } else {
|
|
|
329 ngx_accept_mutex_held = 0;
|
|
|
330
|
|
|
331 if (ngx_trylock_accept_mutex(cycle) == NGX_ERROR) {
|
|
|
332 return NGX_ERROR;
|
|
|
333 }
|
|
|
334
|
|
|
335 if (ngx_accept_mutex_held == 0
|
|
|
336 && (timer == NGX_TIMER_INFINITE
|
|
|
337 || timer > ngx_accept_mutex_delay))
|
|
|
338 {
|
|
|
339 timer = ngx_accept_mutex_delay;
|
|
|
340 expire = 0;
|
|
|
341 }
|
|
|
342 }
|
|
|
343 }
|
|
|
344 }
|
|
|
345
|
|
|
346 if (timer == NGX_TIMER_INFINITE) {
|
|
|
347 tp = NULL;
|
|
|
348 expire = 0;
|
|
|
349
|
|
|
350 } else {
|
|
|
351 ts.tv_sec = timer / 1000;
|
|
|
352 ts.tv_nsec = (timer % 1000) * 1000000;
|
|
|
353 tp = &ts;
|
|
|
354 }
|
|
|
355
|
|
|
356 ngx_old_elapsed_msec = ngx_elapsed_msec;
|
|
|
357
|
|
|
358 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
|
359 "rtsig timer: %d", timer);
|
|
|
360
|
|
|
361 /* Linux's sigwaitinfo() is sigtimedwait() with the NULL timeout pointer */
|
|
|
362
|
|
|
363 signo = sigtimedwait(&set, &si, tp);
|
|
|
364
|
|
|
365 if (signo == -1) {
|
|
|
366 err = ngx_errno;
|
|
|
367
|
|
|
368 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, err,
|
|
|
369 "rtsig signo:%d", signo);
|
|
|
370
|
|
|
371 if (err == NGX_EAGAIN) {
|
|
|
372
|
|
|
373 if (timer == NGX_TIMER_INFINITE) {
|
|
|
374 ngx_accept_mutex_unlock();
|
|
|
375 ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
|
|
|
376 "sigtimedwait() returned EAGAIN without timeout");
|
|
|
377 return NGX_ERROR;
|
|
|
378 }
|
|
|
379
|
|
|
380 err = 0;
|
|
|
381 }
|
|
|
382
|
|
|
383 } else {
|
|
|
384 err = 0;
|
|
|
385 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
10
|
386 "rtsig signo:%d fd:%d band:%04Xd",
|
|
0
|
387 signo, si.si_fd, si.si_band);
|
|
|
388 }
|
|
|
389
|
|
|
390 ngx_gettimeofday(&tv);
|
|
|
391 ngx_time_update(tv.tv_sec);
|
|
|
392
|
|
|
393 delta = ngx_elapsed_msec;
|
|
|
394 ngx_elapsed_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000
|
|
|
395 + tv.tv_usec / 1000 - ngx_start_msec;
|
|
|
396
|
|
|
397 if (err) {
|
|
|
398 ngx_accept_mutex_unlock();
|
|
|
399 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
|
|
|
400 cycle->log, err, "sigtimedwait() failed");
|
|
|
401 return NGX_ERROR;
|
|
|
402 }
|
|
|
403
|
|
|
404 if (timer != NGX_TIMER_INFINITE) {
|
|
|
405 delta = ngx_elapsed_msec - delta;
|
|
|
406
|
|
|
407 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
|
408 "rtsig timer: %d, delta: %d", timer, (int) delta);
|
|
|
409 }
|
|
|
410
|
|
|
411 rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
|
|
|
412
|
|
|
413 if (signo == rtscf->signo || signo == rtscf->signo + 1) {
|
|
|
414
|
|
|
415 if (overflow && (ngx_uint_t) si.si_fd > overflow_current) {
|
|
|
416 return NGX_OK;
|
|
|
417 }
|
|
|
418
|
|
|
419 /* TODO: old_cycles */
|
|
|
420
|
|
|
421 c = &ngx_cycle->connections[si.si_fd];
|
|
|
422
|
|
|
423 instance = signo - rtscf->signo;
|
|
|
424
|
|
|
425 rev = c->read;
|
|
|
426
|
|
|
427 if (c->read->instance != instance) {
|
|
|
428
|
|
|
429 /*
|
|
|
430 * the stale event from a file descriptor
|
|
|
431 * that was just closed in this iteration
|
|
|
432 */
|
|
|
433
|
|
|
434 ngx_accept_mutex_unlock();
|
|
|
435
|
|
|
436 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
10
|
437 "rtsig: stale event %p", c);
|
|
0
|
438
|
|
|
439 return NGX_OK;
|
|
|
440 }
|
|
|
441
|
|
|
442 if (si.si_band & (POLLIN|POLLHUP|POLLERR)) {
|
|
|
443 if (rev->active) {
|
|
|
444
|
|
|
445 if (ngx_threaded && !rev->accept) {
|
|
|
446 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
|
447 ngx_accept_mutex_unlock();
|
|
|
448 return NGX_ERROR;
|
|
|
449 }
|
|
|
450
|
|
|
451 rev->posted_ready = 1;
|
|
|
452 ngx_post_event(rev);
|
|
|
453
|
|
|
454 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
455
|
|
|
456 } else {
|
|
|
457 rev->ready = 1;
|
|
|
458
|
|
|
459 if (!ngx_threaded && !ngx_accept_mutex_held) {
|
|
|
460 rev->event_handler(rev);
|
|
|
461
|
|
|
462 } else if (rev->accept) {
|
|
|
463 if (ngx_accept_disabled <= 0) {
|
|
|
464 rev->event_handler(rev);
|
|
|
465 }
|
|
|
466
|
|
|
467 } else {
|
|
|
468 ngx_post_event(rev);
|
|
|
469 }
|
|
|
470 }
|
|
|
471 }
|
|
|
472 }
|
|
|
473
|
|
|
474 wev = c->write;
|
|
|
475
|
|
|
476 if (si.si_band & (POLLOUT|POLLHUP|POLLERR)) {
|
|
|
477 if (wev->active) {
|
|
|
478
|
|
|
479 if (ngx_threaded) {
|
|
|
480 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
|
481 ngx_accept_mutex_unlock();
|
|
|
482 return NGX_ERROR;
|
|
|
483 }
|
|
|
484
|
|
|
485 wev->posted_ready = 1;
|
|
|
486 ngx_post_event(wev);
|
|
|
487
|
|
|
488 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
489
|
|
|
490 } else {
|
|
|
491 wev->ready = 1;
|
|
|
492
|
|
|
493 if (!ngx_threaded && !ngx_accept_mutex_held) {
|
|
|
494 wev->event_handler(wev);
|
|
|
495
|
|
|
496 } else {
|
|
|
497 ngx_post_event(wev);
|
|
|
498 }
|
|
|
499 }
|
|
|
500 }
|
|
|
501 }
|
|
|
502
|
|
|
503 } else if (signo == SIGIO) {
|
|
|
504 ngx_accept_mutex_unlock();
|
|
|
505
|
|
|
506 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
|
507 "rt signal queue overflowed");
|
|
|
508
|
|
|
509 /* flush the RT signal queue */
|
|
|
510
|
|
|
511 ngx_memzero(&sa, sizeof(struct sigaction));
|
|
|
512 sa.sa_handler = SIG_DFL;
|
|
|
513 sigemptyset(&sa.sa_mask);
|
|
|
514
|
|
|
515 if (sigaction(rtscf->signo, &sa, NULL) == -1) {
|
|
|
516 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
|
|
|
517 "sigaction(%d, SIG_DFL) failed", rtscf->signo);
|
|
|
518 }
|
|
|
519
|
|
|
520 if (sigaction(rtscf->signo + 1, &sa, NULL) == -1) {
|
|
|
521 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
|
|
|
522 "sigaction(%d, SIG_DFL) failed", rtscf->signo + 1);
|
|
|
523 }
|
|
|
524
|
|
|
525 overflow = 1;
|
|
|
526 overflow_current = 0;
|
|
|
527 ngx_event_actions.process_events = ngx_rtsig_process_overflow;
|
|
|
528
|
|
|
529 return NGX_ERROR;
|
|
|
530
|
|
|
531 } else if (signo != -1) {
|
|
|
532 ngx_accept_mutex_unlock();
|
|
|
533
|
|
|
534 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
|
535 "sigtimedwait() returned unexpected signal: %d", signo);
|
|
|
536
|
|
|
537 return NGX_ERROR;
|
|
|
538 }
|
|
|
539
|
|
|
540 ngx_accept_mutex_unlock();
|
|
|
541
|
|
|
542 if (expire && delta) {
|
|
|
543 ngx_event_expire_timers((ngx_msec_t) delta);
|
|
|
544 }
|
|
|
545
|
|
|
546 if (ngx_posted_events) {
|
|
|
547 if (ngx_threaded) {
|
|
|
548 ngx_wakeup_worker_thread(cycle);
|
|
|
549
|
|
|
550 } else {
|
|
|
551 ngx_event_process_posted(cycle);
|
|
|
552 }
|
|
|
553 }
|
|
|
554
|
|
|
555 if (signo == -1) {
|
|
|
556 return NGX_AGAIN;
|
|
|
557 } else {
|
|
|
558 return NGX_OK;
|
|
|
559 }
|
|
|
560 }
|
|
|
561
|
|
|
562
|
|
|
563 /* TODO: old cylces */
|
|
|
564
|
|
|
565 static ngx_int_t ngx_rtsig_process_overflow(ngx_cycle_t *cycle)
|
|
|
566 {
|
|
|
567 int name[2], rtsig_max, rtsig_nr, events, ready;
|
|
|
568 size_t len;
|
|
|
569 ngx_int_t tested, n, i;
|
|
|
570 ngx_err_t err;
|
|
|
571 ngx_event_t *rev, *wev;
|
|
|
572 ngx_connection_t *c;
|
|
|
573 ngx_rtsig_conf_t *rtscf;
|
|
|
574
|
|
|
575 rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
|
|
|
576
|
|
|
577 tested = 0;
|
|
|
578
|
|
|
579 for ( ;; ) {
|
|
|
580
|
|
|
581 n = 0;
|
|
|
582 while (n < rtscf->overflow_events) {
|
|
|
583
|
|
|
584 if (overflow_current == cycle->connection_n) {
|
|
|
585 break;
|
|
|
586 }
|
|
|
587
|
|
|
588 c = &cycle->connections[overflow_current++];
|
|
|
589
|
|
|
590 if (c->fd == -1) {
|
|
|
591 continue;
|
|
|
592 }
|
|
|
593
|
|
|
594 events = 0;
|
|
|
595
|
|
|
596 if (c->read->active && c->read->event_handler) {
|
|
|
597 events |= POLLIN;
|
|
|
598 }
|
|
|
599
|
|
|
600 if (c->write->active && c->write->event_handler) {
|
|
|
601 events |= POLLOUT;
|
|
|
602 }
|
|
|
603
|
|
|
604 if (events == 0) {
|
|
|
605 continue;
|
|
|
606 }
|
|
|
607
|
|
|
608 overflow_list[n].fd = c->fd;
|
|
|
609 overflow_list[n].events = events;
|
|
|
610 overflow_list[n].revents = 0;
|
|
|
611 n++;
|
|
|
612 }
|
|
|
613
|
|
|
614 if (n == 0) {
|
|
|
615 break;
|
|
|
616 }
|
|
|
617
|
|
|
618 for ( ;; ) {
|
|
|
619 ready = poll(overflow_list, n, 0);
|
|
|
620
|
|
|
621 if (ready == -1) {
|
|
|
622 err = ngx_errno;
|
|
|
623 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
|
|
|
624 cycle->log, 0,
|
|
|
625 "poll() failed while the overflow recover");
|
|
|
626
|
|
|
627 if (err == NGX_EINTR) {
|
|
|
628 continue;
|
|
|
629 }
|
|
|
630 }
|
|
|
631
|
|
|
632 break;
|
|
|
633 }
|
|
|
634
|
|
|
635 if (ready <= 0) {
|
|
|
636 continue;
|
|
|
637 }
|
|
|
638
|
|
|
639 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
|
640 return NGX_ERROR;
|
|
|
641 }
|
|
|
642
|
|
|
643 for (i = 0; i < n; i++) {
|
|
|
644 c = &cycle->connections[overflow_list[i].fd];
|
|
|
645
|
|
|
646 rev = c->read;
|
|
|
647
|
|
|
648 if (rev->active
|
|
|
649 && !rev->closed
|
|
|
650 && rev->event_handler
|
|
|
651 && (overflow_list[i].revents
|
|
|
652 & (POLLIN|POLLERR|POLLHUP|POLLNVAL)))
|
|
|
653 {
|
|
|
654 tested++;
|
|
|
655
|
|
|
656 if (ngx_threaded) {
|
|
|
657 rev->posted_ready = 1;
|
|
|
658 ngx_post_event(rev);
|
|
|
659
|
|
|
660 } else {
|
|
|
661 rev->ready = 1;
|
|
|
662 rev->event_handler(rev);
|
|
|
663 }
|
|
|
664 }
|
|
|
665
|
|
|
666 wev = c->write;
|
|
|
667
|
|
|
668 if (wev->active
|
|
|
669 && !wev->closed
|
|
|
670 && wev->event_handler
|
|
|
671 && (overflow_list[i].revents
|
|
|
672 & (POLLOUT|POLLERR|POLLHUP|POLLNVAL)))
|
|
|
673 {
|
|
|
674 tested++;
|
|
|
675
|
|
|
676 if (ngx_threaded) {
|
|
|
677 wev->posted_ready = 1;
|
|
|
678 ngx_post_event(wev);
|
|
|
679
|
|
|
680 } else {
|
|
|
681 wev->ready = 1;
|
|
|
682 wev->event_handler(wev);
|
|
|
683 }
|
|
|
684 }
|
|
|
685 }
|
|
|
686
|
|
|
687 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
688
|
|
|
689 if (tested >= rtscf->overflow_test) {
|
|
|
690
|
|
|
691 if (ngx_linux_rtsig_max) {
|
|
|
692
|
|
|
693 /*
|
|
|
694 * Check the current rt queue length to prevent
|
|
|
695 * the new overflow.
|
|
|
696 *
|
|
|
697 * Learn the /proc/sys/kernel/rtsig-max value because
|
|
2
|
698 * it can be changed since the last checking.
|
|
0
|
699 */
|
|
|
700
|
|
|
701 name[0] = CTL_KERN;
|
|
|
702 name[1] = KERN_RTSIGMAX;
|
|
|
703 len = sizeof(rtsig_max);
|
|
|
704 if (sysctl(name, sizeof(name), &rtsig_max, &len, NULL, 0) == -1)
|
|
|
705 {
|
|
|
706 ngx_log_error(NGX_LOG_ALERT, cycle->log, errno,
|
|
|
707 "sysctl(KERN_RTSIGMAX) failed");
|
|
|
708 return NGX_ERROR;
|
|
|
709 }
|
|
|
710
|
|
|
711 name[0] = CTL_KERN;
|
|
|
712 name[1] = KERN_RTSIGNR;
|
|
|
713 len = sizeof(rtsig_nr);
|
|
|
714 if (sysctl(name, sizeof(name), &rtsig_nr, &len, NULL, 0) == -1)
|
|
|
715 {
|
|
|
716 ngx_log_error(NGX_LOG_ALERT, cycle->log, errno,
|
|
|
717 "sysctl(KERN_RTSIGNR) failed");
|
|
|
718 return NGX_ERROR;
|
|
|
719 }
|
|
|
720
|
|
|
721 /*
|
|
|
722 * drain the rt signal queue if the /proc/sys/kernel/rtsig-nr
|
|
|
723 * is bigger than
|
|
|
724 * /proc/sys/kernel/rtsig-max / rtsig_overflow_threshold
|
|
|
725 */
|
|
|
726
|
|
|
727 if (rtsig_max / rtscf->overflow_threshold < rtsig_nr) {
|
|
|
728 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
|
729 "rtsig queue state: %d/%d",
|
|
|
730 rtsig_nr, rtsig_max);
|
|
|
731 while (ngx_rtsig_process_events(cycle) == NGX_OK) {
|
|
|
732 /* void */
|
|
|
733 }
|
|
|
734 }
|
|
|
735
|
|
|
736 } else {
|
|
|
737
|
|
|
738 /*
|
|
|
739 * Linux has not KERN_RTSIGMAX since 2.6.6-mm2
|
|
|
740 * so drain the rt signal queue unconditionally
|
|
|
741 */
|
|
|
742
|
|
|
743 while (ngx_rtsig_process_events(cycle) == NGX_OK) { /* void */ }
|
|
|
744 }
|
|
|
745
|
|
|
746 tested = 0;
|
|
|
747 }
|
|
|
748 }
|
|
|
749
|
|
|
750 if (ngx_posted_events) {
|
|
|
751 if (ngx_threaded) {
|
|
|
752 ngx_wakeup_worker_thread(cycle);
|
|
|
753
|
|
|
754 } else {
|
|
|
755 ngx_event_process_posted(cycle);
|
|
|
756 }
|
|
|
757 }
|
|
|
758
|
|
|
759 ngx_log_error(NGX_LOG_INFO, cycle->log, 0,
|
|
|
760 "rt signal queue overflow recovered");
|
|
|
761
|
|
|
762 overflow = 0;
|
|
|
763 ngx_event_actions.process_events = ngx_rtsig_process_events;
|
|
|
764
|
|
|
765 return NGX_OK;
|
|
|
766 }
|
|
|
767
|
|
|
768
|
|
|
769 static void *ngx_rtsig_create_conf(ngx_cycle_t *cycle)
|
|
|
770 {
|
|
|
771 ngx_rtsig_conf_t *rtscf;
|
|
|
772
|
|
|
773 ngx_test_null(rtscf, ngx_palloc(cycle->pool, sizeof(ngx_rtsig_conf_t)),
|
|
|
774 NGX_CONF_ERROR);
|
|
|
775
|
|
|
776 rtscf->signo = NGX_CONF_UNSET;
|
|
|
777 rtscf->overflow_events = NGX_CONF_UNSET;
|
|
|
778 rtscf->overflow_test = NGX_CONF_UNSET;
|
|
|
779 rtscf->overflow_threshold = NGX_CONF_UNSET;
|
|
|
780
|
|
|
781 return rtscf;
|
|
|
782 }
|
|
|
783
|
|
|
784
|
|
|
785 static char *ngx_rtsig_init_conf(ngx_cycle_t *cycle, void *conf)
|
|
|
786 {
|
|
|
787 ngx_rtsig_conf_t *rtscf = conf;
|
|
|
788
|
|
|
789 /* LinuxThreads use the first 3 RT signals */
|
|
|
790 ngx_conf_init_value(rtscf->signo, SIGRTMIN + 10);
|
|
|
791
|
|
|
792 ngx_conf_init_value(rtscf->overflow_events, 16);
|
|
|
793 ngx_conf_init_value(rtscf->overflow_test, 32);
|
|
|
794 ngx_conf_init_value(rtscf->overflow_threshold, 10);
|
|
|
795
|
|
|
796 return NGX_CONF_OK;
|
|
|
797 }
|
|
|
798
|
|
|
799
|
|
|
800 static char *ngx_check_ngx_overflow_threshold_bounds(ngx_conf_t *cf,
|
|
|
801 void *post, void *data)
|
|
|
802 {
|
|
|
803 if (ngx_linux_rtsig_max) {
|
|
|
804 return ngx_conf_check_num_bounds(cf, post, data);
|
|
|
805 }
|
|
|
806
|
|
|
807 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
|
|
|
808 "\"rtsig_overflow_threshold\" is not supported "
|
|
|
809 "since Linux 2.6.6-mm2, ignored");
|
|
|
810
|
|
|
811 return NGX_CONF_OK;
|
|
|
812 }
|
