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comparison src/event/modules/ngx_rtsig_module.c @ 0:f0b350454894 NGINX_0_1_0

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nginx 0.1.0 *) The first public version.
author Igor Sysoev <http://sysoev.ru>
date Mon, 04 Oct 2004 00:00:00 +0400
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children cc9f381affaa
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-1:000000000000 0:f0b350454894
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
12 #if (TEST_BUILD_RTSIG)
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 if (ngx_poll_module_ctx.actions.init(cycle) == NGX_ERROR) {
135 return NGX_ERROR;
136 }
137
138 rtscf = ngx_event_get_conf(cycle->conf_ctx, ngx_rtsig_module);
139
140 sigemptyset(&set);
141 sigaddset(&set, rtscf->signo);
142 sigaddset(&set, rtscf->signo + 1);
143 sigaddset(&set, SIGIO);
144
145 if (sigprocmask(SIG_BLOCK, &set, NULL) == -1) {
146 ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
147 "sigprocmask() failed");
148 return NGX_ERROR;
149 }
150
151 if (overflow_list) {
152 ngx_free(overflow_list);
153 }
154
155 overflow_list = ngx_alloc(sizeof(struct pollfd) * rtscf->overflow_events,
156 cycle->log);
157 if (overflow_list == NULL) {
158 return NGX_ERROR;
159 }
160
161 ngx_io = ngx_os_io;
162
163 ngx_event_actions = ngx_rtsig_module_ctx.actions;
164
165 ngx_event_flags = NGX_USE_RTSIG_EVENT|NGX_HAVE_GREEDY_EVENT;
166
167 return NGX_OK;
168 }
169
170
171 static void ngx_rtsig_done(ngx_cycle_t *cycle)
172 {
173 ngx_poll_module_ctx.actions.done(cycle);
174 }
175
176
177 static ngx_int_t ngx_rtsig_add_connection(ngx_connection_t *c)
178 {
179 int signo;
180 ngx_rtsig_conf_t *rtscf;
181
182 if (c->read->accept && c->read->disabled) {
183
184 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
185 "rtsig enable connection: fd:%d", c->fd);
186
187 if (fcntl(c->fd, F_SETOWN, ngx_pid) == -1) {
188 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
189 "fcntl(F_SETOWN) failed");
190 return NGX_ERROR;
191 }
192
193 c->read->active = 1;
194 c->read->disabled = 0;
195 }
196
197 rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
198
199 signo = rtscf->signo + c->read->instance;
200
201 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
202 "rtsig add connection: fd:%d signo:%d", c->fd, signo);
203
204 if (fcntl(c->fd, F_SETFL, O_RDWR|O_NONBLOCK|O_ASYNC) == -1) {
205 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
206 "fcntl(O_RDWR|O_NONBLOCK|O_ASYNC) failed");
207 return NGX_ERROR;
208 }
209
210 if (fcntl(c->fd, F_SETSIG, signo) == -1) {
211 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
212 "fcntl(F_SETSIG) failed");
213 return NGX_ERROR;
214 }
215
216 if (fcntl(c->fd, F_SETOWN, ngx_pid) == -1) {
217 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
218 "fcntl(F_SETOWN) failed");
219 return NGX_ERROR;
220 }
221
222 #if (HAVE_ONESIGFD)
223 if (fcntl(c->fd, F_SETAUXFL, O_ONESIGFD) == -1) {
224 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
225 "fcntl(F_SETAUXFL) failed");
226 return NGX_ERROR;
227 }
228 #endif
229
230 c->read->active = 1;
231 c->write->active = 1;
232
233 return NGX_OK;
234 }
235
236
237 static ngx_int_t ngx_rtsig_del_connection(ngx_connection_t *c, u_int flags)
238 {
239 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
240 "rtsig del connection: fd:%d", c->fd);
241
242 if ((flags & NGX_DISABLE_EVENT) && c->read->accept) {
243
244 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
245 "rtsig disable connection: fd:%d", c->fd);
246
247 c->read->active = 0;
248 c->read->disabled = 1;
249 return NGX_OK;
250 }
251
252 if (flags & NGX_CLOSE_EVENT) {
253 c->read->active = 0;
254 c->write->active = 0;
255 return NGX_OK;
256 }
257
258 if (fcntl(c->fd, F_SETFL, O_RDWR|O_NONBLOCK) == -1) {
259 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
260 "fcntl(O_RDWR|O_NONBLOCK) failed");
261 return NGX_ERROR;
262 }
263
264 c->read->active = 0;
265 c->write->active = 0;
266
267 return NGX_OK;
268 }
269
270
271 ngx_int_t ngx_rtsig_process_events(ngx_cycle_t *cycle)
272 {
273 int signo;
274 ngx_int_t instance, i;
275 ngx_uint_t expire;
276 size_t n;
277 ngx_msec_t timer;
278 ngx_err_t err;
279 siginfo_t si;
280 ngx_event_t *rev, *wev;
281 struct timeval tv;
282 struct timespec ts, *tp;
283 struct sigaction sa;
284 ngx_epoch_msec_t delta;
285 ngx_connection_t *c;
286 ngx_rtsig_conf_t *rtscf;
287
288 if (overflow) {
289 timer = 0;
290 expire = 0;
291
292 } else {
293 for ( ;; ) {
294 timer = ngx_event_find_timer();
295
296 #if (NGX_THREADS)
297
298 if (timer == NGX_TIMER_ERROR) {
299 return NGX_ERROR;
300 }
301
302 if (timer == NGX_TIMER_INFINITE || timer > 500) {
303 timer = 500;
304 break;
305 }
306
307 #endif
308
309 if (timer != 0) {
310 break;
311 }
312
313 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
314 "rtsig expired timer");
315
316 ngx_event_expire_timers((ngx_msec_t)
317 (ngx_elapsed_msec - ngx_old_elapsed_msec));
318
319 if (ngx_posted_events && ngx_threaded) {
320 ngx_wakeup_worker_thread(cycle);
321 }
322 }
323
324 expire = 1;
325
326 if (ngx_accept_mutex) {
327 if (ngx_accept_disabled > 0) {
328 ngx_accept_disabled--;
329
330 } else {
331 ngx_accept_mutex_held = 0;
332
333 if (ngx_trylock_accept_mutex(cycle) == NGX_ERROR) {
334 return NGX_ERROR;
335 }
336
337 if (ngx_accept_mutex_held == 0
338 && (timer == NGX_TIMER_INFINITE
339 || timer > ngx_accept_mutex_delay))
340 {
341 timer = ngx_accept_mutex_delay;
342 expire = 0;
343 }
344 }
345 }
346 }
347
348 if (timer == NGX_TIMER_INFINITE) {
349 tp = NULL;
350 expire = 0;
351
352 } else {
353 ts.tv_sec = timer / 1000;
354 ts.tv_nsec = (timer % 1000) * 1000000;
355 tp = &ts;
356 }
357
358 ngx_old_elapsed_msec = ngx_elapsed_msec;
359
360 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
361 "rtsig timer: %d", timer);
362
363 /* Linux's sigwaitinfo() is sigtimedwait() with the NULL timeout pointer */
364
365 signo = sigtimedwait(&set, &si, tp);
366
367 if (signo == -1) {
368 err = ngx_errno;
369
370 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, err,
371 "rtsig signo:%d", signo);
372
373 if (err == NGX_EAGAIN) {
374
375 if (timer == NGX_TIMER_INFINITE) {
376 ngx_accept_mutex_unlock();
377 ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
378 "sigtimedwait() returned EAGAIN without timeout");
379 return NGX_ERROR;
380 }
381
382 err = 0;
383 }
384
385 } else {
386 err = 0;
387 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
388 "rtsig signo:%d fd:%d band:%X",
389 signo, si.si_fd, si.si_band);
390 }
391
392 ngx_gettimeofday(&tv);
393 ngx_time_update(tv.tv_sec);
394
395 delta = ngx_elapsed_msec;
396 ngx_elapsed_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000
397 + tv.tv_usec / 1000 - ngx_start_msec;
398
399 if (err) {
400 ngx_accept_mutex_unlock();
401 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
402 cycle->log, err, "sigtimedwait() failed");
403 return NGX_ERROR;
404 }
405
406 if (timer != NGX_TIMER_INFINITE) {
407 delta = ngx_elapsed_msec - delta;
408
409 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
410 "rtsig timer: %d, delta: %d", timer, (int) delta);
411 }
412
413 rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
414
415 if (signo == rtscf->signo || signo == rtscf->signo + 1) {
416
417 if (overflow && (ngx_uint_t) si.si_fd > overflow_current) {
418 return NGX_OK;
419 }
420
421 /* TODO: old_cycles */
422
423 c = &ngx_cycle->connections[si.si_fd];
424
425 instance = signo - rtscf->signo;
426
427 rev = c->read;
428
429 if (c->read->instance != instance) {
430
431 /*
432 * the stale event from a file descriptor
433 * that was just closed in this iteration
434 */
435
436 ngx_accept_mutex_unlock();
437
438 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
439 "rtsig: stale event " PTR_FMT, c);
440
441 return NGX_OK;
442 }
443
444 if (si.si_band & (POLLIN|POLLHUP|POLLERR)) {
445 if (rev->active) {
446
447 if (ngx_threaded && !rev->accept) {
448 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
449 ngx_accept_mutex_unlock();
450 return NGX_ERROR;
451 }
452
453 rev->posted_ready = 1;
454 ngx_post_event(rev);
455
456 ngx_mutex_unlock(ngx_posted_events_mutex);
457
458 } else {
459 rev->ready = 1;
460
461 if (!ngx_threaded && !ngx_accept_mutex_held) {
462 rev->event_handler(rev);
463
464 } else if (rev->accept) {
465 if (ngx_accept_disabled <= 0) {
466 rev->event_handler(rev);
467 }
468
469 } else {
470 ngx_post_event(rev);
471 }
472 }
473 }
474 }
475
476 wev = c->write;
477
478 if (si.si_band & (POLLOUT|POLLHUP|POLLERR)) {
479 if (wev->active) {
480
481 if (ngx_threaded) {
482 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
483 ngx_accept_mutex_unlock();
484 return NGX_ERROR;
485 }
486
487 wev->posted_ready = 1;
488 ngx_post_event(wev);
489
490 ngx_mutex_unlock(ngx_posted_events_mutex);
491
492 } else {
493 wev->ready = 1;
494
495 if (!ngx_threaded && !ngx_accept_mutex_held) {
496 wev->event_handler(wev);
497
498 } else {
499 ngx_post_event(wev);
500 }
501 }
502 }
503 }
504
505 } else if (signo == SIGIO) {
506 ngx_accept_mutex_unlock();
507
508 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
509 "rt signal queue overflowed");
510
511 /* flush the RT signal queue */
512
513 ngx_memzero(&sa, sizeof(struct sigaction));
514 sa.sa_handler = SIG_DFL;
515 sigemptyset(&sa.sa_mask);
516
517 if (sigaction(rtscf->signo, &sa, NULL) == -1) {
518 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
519 "sigaction(%d, SIG_DFL) failed", rtscf->signo);
520 }
521
522 if (sigaction(rtscf->signo + 1, &sa, NULL) == -1) {
523 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
524 "sigaction(%d, SIG_DFL) failed", rtscf->signo + 1);
525 }
526
527 overflow = 1;
528 overflow_current = 0;
529 ngx_event_actions.process_events = ngx_rtsig_process_overflow;
530
531 return NGX_ERROR;
532
533 } else if (signo != -1) {
534 ngx_accept_mutex_unlock();
535
536 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
537 "sigtimedwait() returned unexpected signal: %d", signo);
538
539 return NGX_ERROR;
540 }
541
542 ngx_accept_mutex_unlock();
543
544 if (expire && delta) {
545 ngx_event_expire_timers((ngx_msec_t) delta);
546 }
547
548 if (ngx_posted_events) {
549 if (ngx_threaded) {
550 ngx_wakeup_worker_thread(cycle);
551
552 } else {
553 ngx_event_process_posted(cycle);
554 }
555 }
556
557 if (signo == -1) {
558 return NGX_AGAIN;
559 } else {
560 return NGX_OK;
561 }
562 }
563
564
565 /* TODO: old cylces */
566
567 static ngx_int_t ngx_rtsig_process_overflow(ngx_cycle_t *cycle)
568 {
569 int name[2], rtsig_max, rtsig_nr, events, ready;
570 size_t len;
571 ngx_int_t tested, n, i;
572 ngx_err_t err;
573 ngx_event_t *rev, *wev;
574 ngx_connection_t *c;
575 ngx_rtsig_conf_t *rtscf;
576
577 rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
578
579 tested = 0;
580
581 for ( ;; ) {
582
583 n = 0;
584 while (n < rtscf->overflow_events) {
585
586 if (overflow_current == cycle->connection_n) {
587 break;
588 }
589
590 c = &cycle->connections[overflow_current++];
591
592 if (c->fd == -1) {
593 continue;
594 }
595
596 events = 0;
597
598 if (c->read->active && c->read->event_handler) {
599 events |= POLLIN;
600 }
601
602 if (c->write->active && c->write->event_handler) {
603 events |= POLLOUT;
604 }
605
606 if (events == 0) {
607 continue;
608 }
609
610 overflow_list[n].fd = c->fd;
611 overflow_list[n].events = events;
612 overflow_list[n].revents = 0;
613 n++;
614 }
615
616 if (n == 0) {
617 break;
618 }
619
620 for ( ;; ) {
621 ready = poll(overflow_list, n, 0);
622
623 if (ready == -1) {
624 err = ngx_errno;
625 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
626 cycle->log, 0,
627 "poll() failed while the overflow recover");
628
629 if (err == NGX_EINTR) {
630 continue;
631 }
632 }
633
634 break;
635 }
636
637 if (ready <= 0) {
638 continue;
639 }
640
641 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
642 return NGX_ERROR;
643 }
644
645 for (i = 0; i < n; i++) {
646 c = &cycle->connections[overflow_list[i].fd];
647
648 rev = c->read;
649
650 if (rev->active
651 && !rev->closed
652 && rev->event_handler
653 && (overflow_list[i].revents
654 & (POLLIN|POLLERR|POLLHUP|POLLNVAL)))
655 {
656 tested++;
657
658 if (ngx_threaded) {
659 rev->posted_ready = 1;
660 ngx_post_event(rev);
661
662 } else {
663 rev->ready = 1;
664 rev->event_handler(rev);
665 }
666 }
667
668 wev = c->write;
669
670 if (wev->active
671 && !wev->closed
672 && wev->event_handler
673 && (overflow_list[i].revents
674 & (POLLOUT|POLLERR|POLLHUP|POLLNVAL)))
675 {
676 tested++;
677
678 if (ngx_threaded) {
679 wev->posted_ready = 1;
680 ngx_post_event(wev);
681
682 } else {
683 wev->ready = 1;
684 wev->event_handler(wev);
685 }
686 }
687 }
688
689 ngx_mutex_unlock(ngx_posted_events_mutex);
690
691 if (tested >= rtscf->overflow_test) {
692
693 if (ngx_linux_rtsig_max) {
694
695 /*
696 * Check the current rt queue length to prevent
697 * the new overflow.
698 *
699 * Learn the /proc/sys/kernel/rtsig-max value because
700 * it can be changed sisnce the last checking.
701 */
702
703 name[0] = CTL_KERN;
704 name[1] = KERN_RTSIGMAX;
705 len = sizeof(rtsig_max);
706 if (sysctl(name, sizeof(name), &rtsig_max, &len, NULL, 0) == -1)
707 {
708 ngx_log_error(NGX_LOG_ALERT, cycle->log, errno,
709 "sysctl(KERN_RTSIGMAX) failed");
710 return NGX_ERROR;
711 }
712
713 name[0] = CTL_KERN;
714 name[1] = KERN_RTSIGNR;
715 len = sizeof(rtsig_nr);
716 if (sysctl(name, sizeof(name), &rtsig_nr, &len, NULL, 0) == -1)
717 {
718 ngx_log_error(NGX_LOG_ALERT, cycle->log, errno,
719 "sysctl(KERN_RTSIGNR) failed");
720 return NGX_ERROR;
721 }
722
723 /*
724 * drain the rt signal queue if the /proc/sys/kernel/rtsig-nr
725 * is bigger than
726 * /proc/sys/kernel/rtsig-max / rtsig_overflow_threshold
727 */
728
729 if (rtsig_max / rtscf->overflow_threshold < rtsig_nr) {
730 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
731 "rtsig queue state: %d/%d",
732 rtsig_nr, rtsig_max);
733 while (ngx_rtsig_process_events(cycle) == NGX_OK) {
734 /* void */
735 }
736 }
737
738 } else {
739
740 /*
741 * Linux has not KERN_RTSIGMAX since 2.6.6-mm2
742 * so drain the rt signal queue unconditionally
743 */
744
745 while (ngx_rtsig_process_events(cycle) == NGX_OK) { /* void */ }
746 }
747
748 tested = 0;
749 }
750 }
751
752 if (ngx_posted_events) {
753 if (ngx_threaded) {
754 ngx_wakeup_worker_thread(cycle);
755
756 } else {
757 ngx_event_process_posted(cycle);
758 }
759 }
760
761 ngx_log_error(NGX_LOG_INFO, cycle->log, 0,
762 "rt signal queue overflow recovered");
763
764 overflow = 0;
765 ngx_event_actions.process_events = ngx_rtsig_process_events;
766
767 return NGX_OK;
768 }
769
770
771 static void *ngx_rtsig_create_conf(ngx_cycle_t *cycle)
772 {
773 ngx_rtsig_conf_t *rtscf;
774
775 ngx_test_null(rtscf, ngx_palloc(cycle->pool, sizeof(ngx_rtsig_conf_t)),
776 NGX_CONF_ERROR);
777
778 rtscf->signo = NGX_CONF_UNSET;
779 rtscf->overflow_events = NGX_CONF_UNSET;
780 rtscf->overflow_test = NGX_CONF_UNSET;
781 rtscf->overflow_threshold = NGX_CONF_UNSET;
782
783 return rtscf;
784 }
785
786
787 static char *ngx_rtsig_init_conf(ngx_cycle_t *cycle, void *conf)
788 {
789 ngx_rtsig_conf_t *rtscf = conf;
790
791 /* LinuxThreads use the first 3 RT signals */
792 ngx_conf_init_value(rtscf->signo, SIGRTMIN + 10);
793
794 ngx_conf_init_value(rtscf->overflow_events, 16);
795 ngx_conf_init_value(rtscf->overflow_test, 32);
796 ngx_conf_init_value(rtscf->overflow_threshold, 10);
797
798 return NGX_CONF_OK;
799 }
800
801
802 static char *ngx_check_ngx_overflow_threshold_bounds(ngx_conf_t *cf,
803 void *post, void *data)
804 {
805 if (ngx_linux_rtsig_max) {
806 return ngx_conf_check_num_bounds(cf, post, data);
807 }
808
809 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
810 "\"rtsig_overflow_threshold\" is not supported "
811 "since Linux 2.6.6-mm2, ignored");
812
813 return NGX_CONF_OK;
814 }