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comparison src/os/unix/ngx_process_cycle.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
parents
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 #include <ngx_channel.h>
11
12
13 static void ngx_start_worker_processes(ngx_cycle_t *cycle, ngx_int_t n,
14 ngx_int_t type);
15 static void ngx_signal_worker_processes(ngx_cycle_t *cycle, int signo);
16 static ngx_uint_t ngx_reap_childs(ngx_cycle_t *cycle);
17 static void ngx_master_exit(ngx_cycle_t *cycle, ngx_master_ctx_t *ctx);
18 static void ngx_worker_process_cycle(ngx_cycle_t *cycle, void *data);
19 static void ngx_channel_handler(ngx_event_t *ev);
20 #if (NGX_THREADS)
21 static void ngx_wakeup_worker_threads(ngx_cycle_t *cycle);
22 static void *ngx_worker_thread_cycle(void *data);
23 #endif
24
25
26 ngx_uint_t ngx_process;
27 ngx_pid_t ngx_pid;
28 ngx_uint_t ngx_threaded;
29
30 sig_atomic_t ngx_reap;
31 sig_atomic_t ngx_timer;
32 sig_atomic_t ngx_sigio;
33 sig_atomic_t ngx_terminate;
34 sig_atomic_t ngx_quit;
35 ngx_uint_t ngx_exiting;
36 sig_atomic_t ngx_reconfigure;
37 sig_atomic_t ngx_reopen;
38
39 sig_atomic_t ngx_change_binary;
40 ngx_pid_t ngx_new_binary;
41 ngx_uint_t ngx_inherited;
42 ngx_uint_t ngx_daemonized;
43
44 sig_atomic_t ngx_noaccept;
45 ngx_uint_t ngx_noaccepting;
46 ngx_uint_t ngx_restart;
47
48
49 #if (NGX_THREADS)
50 volatile ngx_thread_t ngx_threads[NGX_MAX_THREADS];
51 ngx_int_t ngx_threads_n;
52 #endif
53
54
55 u_char master_process[] = "master process";
56
57
58 void ngx_master_process_cycle(ngx_cycle_t *cycle, ngx_master_ctx_t *ctx)
59 {
60 char *title;
61 u_char *p;
62 size_t size;
63 ngx_int_t i;
64 sigset_t set;
65 struct timeval tv;
66 struct itimerval itv;
67 ngx_uint_t live;
68 ngx_msec_t delay;
69 ngx_core_conf_t *ccf;
70
71 sigemptyset(&set);
72 sigaddset(&set, SIGCHLD);
73 sigaddset(&set, SIGALRM);
74 sigaddset(&set, SIGIO);
75 sigaddset(&set, SIGINT);
76 sigaddset(&set, ngx_signal_value(NGX_RECONFIGURE_SIGNAL));
77 sigaddset(&set, ngx_signal_value(NGX_REOPEN_SIGNAL));
78 sigaddset(&set, ngx_signal_value(NGX_NOACCEPT_SIGNAL));
79 sigaddset(&set, ngx_signal_value(NGX_TERMINATE_SIGNAL));
80 sigaddset(&set, ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
81 sigaddset(&set, ngx_signal_value(NGX_CHANGEBIN_SIGNAL));
82
83 if (sigprocmask(SIG_BLOCK, &set, NULL) == -1) {
84 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
85 "sigprocmask() failed");
86 }
87
88 sigemptyset(&set);
89
90
91 size = sizeof(master_process);
92
93 for (i = 0; i < ctx->argc; i++) {
94 size += ngx_strlen(ctx->argv[i]) + 1;
95 }
96
97 title = ngx_palloc(cycle->pool, size);
98
99 p = ngx_cpymem(title, master_process, sizeof(master_process) - 1);
100 for (i = 0; i < ctx->argc; i++) {
101 *p++ = ' ';
102 p = ngx_cpystrn(p, (u_char *) ctx->argv[i], size);
103 }
104
105 ngx_setproctitle(title);
106
107
108 ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);
109
110 ngx_start_worker_processes(cycle, ccf->worker_processes,
111 NGX_PROCESS_RESPAWN);
112
113 ngx_new_binary = 0;
114 delay = 0;
115 live = 1;
116
117 for ( ;; ) {
118 if (delay) {
119 delay *= 2;
120
121 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
122 "temination cycle: %d", delay);
123
124 itv.it_interval.tv_sec = 0;
125 itv.it_interval.tv_usec = 0;
126 itv.it_value.tv_sec = delay / 1000;
127 itv.it_value.tv_usec = (delay % 1000 ) * 1000;
128
129 if (setitimer(ITIMER_REAL, &itv, NULL) == -1) {
130 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
131 "setitimer() failed");
132 }
133 }
134
135 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "sigsuspend");
136
137 sigsuspend(&set);
138
139 ngx_gettimeofday(&tv);
140 ngx_time_update(tv.tv_sec);
141
142 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "wake up");
143
144 if (ngx_reap) {
145 ngx_reap = 0;
146 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "reap childs");
147
148 live = ngx_reap_childs(cycle);
149 }
150
151 if (!live && (ngx_terminate || ngx_quit)) {
152 ngx_master_exit(cycle, ctx);
153 }
154
155 if (ngx_terminate) {
156 if (delay == 0) {
157 delay = 50;
158 }
159
160 if (delay > 1000) {
161 ngx_signal_worker_processes(cycle, SIGKILL);
162 } else {
163 ngx_signal_worker_processes(cycle,
164 ngx_signal_value(NGX_TERMINATE_SIGNAL));
165 }
166
167 continue;
168 }
169
170 if (ngx_quit) {
171 ngx_signal_worker_processes(cycle,
172 ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
173 continue;
174 }
175
176 if (ngx_timer) {
177 ngx_timer = 0;
178 ngx_start_worker_processes(cycle, ccf->worker_processes,
179 NGX_PROCESS_JUST_RESPAWN);
180 live = 1;
181 ngx_signal_worker_processes(cycle,
182 ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
183 }
184
185 if (ngx_reconfigure) {
186 ngx_reconfigure = 0;
187
188 if (ngx_new_binary) {
189 ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "start new workers");
190
191 ngx_start_worker_processes(cycle, ccf->worker_processes,
192 NGX_PROCESS_RESPAWN);
193 ngx_noaccepting = 0;
194
195 continue;
196 }
197
198 ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "reconfiguring");
199
200 cycle = ngx_init_cycle(cycle);
201 if (cycle == NULL) {
202 cycle = (ngx_cycle_t *) ngx_cycle;
203 continue;
204 }
205
206 ngx_cycle = cycle;
207 ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx,
208 ngx_core_module);
209 ngx_start_worker_processes(cycle, ccf->worker_processes,
210 NGX_PROCESS_JUST_RESPAWN);
211 live = 1;
212 ngx_signal_worker_processes(cycle,
213 ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
214 }
215
216 if (ngx_restart) {
217 ngx_restart = 0;
218 ngx_start_worker_processes(cycle, ccf->worker_processes,
219 NGX_PROCESS_RESPAWN);
220 live = 1;
221 }
222
223 if (ngx_reopen) {
224 ngx_reopen = 0;
225 ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "reopening logs");
226 ngx_reopen_files(cycle, ccf->user);
227 ngx_signal_worker_processes(cycle,
228 ngx_signal_value(NGX_REOPEN_SIGNAL));
229 }
230
231 if (ngx_change_binary) {
232 ngx_change_binary = 0;
233 ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "changing binary");
234 ngx_new_binary = ngx_exec_new_binary(cycle, ctx->argv);
235 }
236
237 if (ngx_noaccept) {
238 ngx_noaccept = 0;
239 ngx_noaccepting = 1;
240 ngx_signal_worker_processes(cycle,
241 ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
242 }
243 }
244 }
245
246
247 void ngx_single_process_cycle(ngx_cycle_t *cycle, ngx_master_ctx_t *ctx)
248 {
249 ngx_uint_t i;
250
251 #if 0
252 ngx_setproctitle("single worker process");
253 #endif
254
255 ngx_init_temp_number();
256
257 for (i = 0; ngx_modules[i]; i++) {
258 if (ngx_modules[i]->init_process) {
259 if (ngx_modules[i]->init_process(cycle) == NGX_ERROR) {
260 /* fatal */
261 exit(2);
262 }
263 }
264 }
265
266 for ( ;; ) {
267 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "worker cycle");
268
269 ngx_process_events(cycle);
270
271 if (ngx_terminate || ngx_quit) {
272 ngx_master_exit(cycle, ctx);
273 }
274
275 if (ngx_reconfigure) {
276 ngx_reconfigure = 0;
277 ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "reconfiguring");
278
279 cycle = ngx_init_cycle(cycle);
280 if (cycle == NULL) {
281 cycle = (ngx_cycle_t *) ngx_cycle;
282 continue;
283 }
284
285 ngx_cycle = cycle;
286 }
287
288 if (ngx_reopen) {
289 ngx_reopen = 0;
290 ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "reopening logs");
291 ngx_reopen_files(cycle, (ngx_uid_t) -1);
292 }
293 }
294 }
295
296
297 static void ngx_start_worker_processes(ngx_cycle_t *cycle, ngx_int_t n,
298 ngx_int_t type)
299 {
300 ngx_int_t i;
301 ngx_channel_t ch;
302 struct itimerval itv;
303
304 ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "start worker processes");
305
306 ch.command = NGX_CMD_OPEN_CHANNEL;
307
308 while (n--) {
309 ngx_spawn_process(cycle, ngx_worker_process_cycle, NULL,
310 "worker process", type);
311
312 ch.pid = ngx_processes[ngx_process_slot].pid;
313 ch.slot = ngx_process_slot;
314 ch.fd = ngx_processes[ngx_process_slot].channel[0];
315
316 for (i = 0; i < ngx_last_process; i++) {
317
318 if (i == ngx_process_slot
319 || ngx_processes[i].pid == -1
320 || ngx_processes[i].channel[0] == -1)
321 {
322 continue;
323 }
324
325 ngx_log_debug6(NGX_LOG_DEBUG_CORE, cycle->log, 0,
326 "pass channel s:%d pid:" PID_T_FMT
327 " fd:%d to s:%d pid:" PID_T_FMT " fd:%d",
328 ch.slot, ch.pid, ch.fd,
329 i, ngx_processes[i].pid,
330 ngx_processes[i].channel[0]);
331
332 /* TODO: NGX_AGAIN */
333
334 ngx_write_channel(ngx_processes[i].channel[0],
335 &ch, sizeof(ngx_channel_t), cycle->log);
336 }
337 }
338
339 /*
340 * we have to limit the maximum life time of the worker processes
341 * by 10 days because our millisecond event timer is limited
342 * by 24 days on 32-bit platforms
343 */
344
345 itv.it_interval.tv_sec = 0;
346 itv.it_interval.tv_usec = 0;
347 itv.it_value.tv_sec = 10 * 24 * 60 * 60;
348 itv.it_value.tv_usec = 0;
349
350 if (setitimer(ITIMER_REAL, &itv, NULL) == -1) {
351 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
352 "setitimer() failed");
353 }
354 }
355
356
357 static void ngx_signal_worker_processes(ngx_cycle_t *cycle, int signo)
358 {
359 ngx_int_t i;
360 ngx_err_t err;
361 ngx_channel_t ch;
362
363
364 switch (signo) {
365
366 case ngx_signal_value(NGX_SHUTDOWN_SIGNAL):
367 ch.command = NGX_CMD_QUIT;
368 break;
369
370 case ngx_signal_value(NGX_TERMINATE_SIGNAL):
371 ch.command = NGX_CMD_TERMINATE;
372 break;
373
374 case ngx_signal_value(NGX_REOPEN_SIGNAL):
375 ch.command = NGX_CMD_REOPEN;
376 break;
377
378 default:
379 ch.command = 0;
380 }
381
382 ch.fd = -1;
383
384
385 for (i = 0; i < ngx_last_process; i++) {
386
387 ngx_log_debug7(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
388 "child: %d " PID_T_FMT " e:%d t:%d d:%d r:%d j:%d",
389 i,
390 ngx_processes[i].pid,
391 ngx_processes[i].exiting,
392 ngx_processes[i].exited,
393 ngx_processes[i].detached,
394 ngx_processes[i].respawn,
395 ngx_processes[i].just_respawn);
396
397 if (ngx_processes[i].detached || ngx_processes[i].pid == -1) {
398 continue;
399 }
400
401 if (ngx_processes[i].just_respawn) {
402 ngx_processes[i].just_respawn = 0;
403 continue;
404 }
405
406 if (ngx_processes[i].exiting
407 && signo == ngx_signal_value(NGX_SHUTDOWN_SIGNAL))
408 {
409 continue;
410 }
411
412 if (ch.command) {
413 if (ngx_write_channel(ngx_processes[i].channel[0],
414 &ch, sizeof(ngx_channel_t), cycle->log) == NGX_OK)
415 {
416 if (signo != ngx_signal_value(NGX_REOPEN_SIGNAL)) {
417 ngx_processes[i].exiting = 1;
418 }
419
420 continue;
421 }
422 }
423
424 ngx_log_debug2(NGX_LOG_DEBUG_CORE, cycle->log, 0,
425 "kill (" PID_T_FMT ", %d)" ,
426 ngx_processes[i].pid, signo);
427
428 if (kill(ngx_processes[i].pid, signo) == -1) {
429 err = ngx_errno;
430 ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
431 "kill(%d, %d) failed",
432 ngx_processes[i].pid, signo);
433
434 if (err == NGX_ESRCH) {
435 ngx_processes[i].exited = 1;
436 ngx_processes[i].exiting = 0;
437 ngx_reap = 1;
438 }
439
440 continue;
441 }
442
443 if (signo != ngx_signal_value(NGX_REOPEN_SIGNAL)) {
444 ngx_processes[i].exiting = 1;
445 }
446 }
447 }
448
449
450 static ngx_uint_t ngx_reap_childs(ngx_cycle_t *cycle)
451 {
452 ngx_int_t i, n;
453 ngx_uint_t live;
454 ngx_channel_t ch;
455
456 ch.command = NGX_CMD_CLOSE_CHANNEL;
457 ch.fd = -1;
458
459 live = 0;
460 for (i = 0; i < ngx_last_process; i++) {
461
462 ngx_log_debug7(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
463 "child: %d " PID_T_FMT " e:%d t:%d d:%d r:%d j:%d",
464 i,
465 ngx_processes[i].pid,
466 ngx_processes[i].exiting,
467 ngx_processes[i].exited,
468 ngx_processes[i].detached,
469 ngx_processes[i].respawn,
470 ngx_processes[i].just_respawn);
471
472 if (ngx_processes[i].pid == -1) {
473 continue;
474 }
475
476 if (ngx_processes[i].exited) {
477
478 if (!ngx_processes[i].detached) {
479 ngx_close_channel(ngx_processes[i].channel, cycle->log);
480
481 ngx_processes[i].channel[0] = -1;
482 ngx_processes[i].channel[1] = -1;
483
484 ch.pid = ngx_processes[i].pid;
485 ch.slot = i;
486
487 for (n = 0; n < ngx_last_process; n++) {
488 if (ngx_processes[n].exited
489 || ngx_processes[n].pid == -1
490 || ngx_processes[n].channel[0] == -1)
491 {
492 continue;
493 }
494
495 ngx_log_debug3(NGX_LOG_DEBUG_CORE, cycle->log, 0,
496 "pass close channel s:%d pid:" PID_T_FMT
497 " to:" PID_T_FMT, ch.slot, ch.pid, ngx_processes[n].pid);
498
499 /* TODO: NGX_AGAIN */
500
501 ngx_write_channel(ngx_processes[n].channel[0],
502 &ch, sizeof(ngx_channel_t), cycle->log);
503 }
504 }
505
506 if (ngx_processes[i].respawn
507 && !ngx_processes[i].exiting
508 && !ngx_terminate
509 && !ngx_quit)
510 {
511 if (ngx_spawn_process(cycle, ngx_processes[i].proc,
512 ngx_processes[i].data,
513 ngx_processes[i].name, i)
514 == NGX_ERROR)
515 {
516 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
517 "can not respawn %s", ngx_processes[i].name);
518 continue;
519 }
520
521 live = 1;
522
523 continue;
524 }
525
526 if (ngx_processes[i].pid == ngx_new_binary) {
527 ngx_new_binary = 0;
528 if (ngx_noaccepting) {
529 ngx_restart = 1;
530 ngx_noaccepting = 0;
531 }
532 }
533
534 if (i == ngx_last_process - 1) {
535 ngx_last_process--;
536
537 } else {
538 ngx_processes[i].pid = -1;
539 }
540
541 } else if (ngx_processes[i].exiting || !ngx_processes[i].detached) {
542 live = 1;
543 }
544 }
545
546 return live;
547 }
548
549
550 static void ngx_master_exit(ngx_cycle_t *cycle, ngx_master_ctx_t *ctx)
551 {
552 ngx_delete_pidfile(cycle);
553
554 ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "exit");
555
556 ngx_destroy_pool(cycle->pool);
557
558 exit(0);
559 }
560
561
562 static void ngx_worker_process_cycle(ngx_cycle_t *cycle, void *data)
563 {
564 sigset_t set;
565 ngx_err_t err;
566 ngx_int_t n;
567 ngx_uint_t i;
568 struct timeval tv;
569 ngx_listening_t *ls;
570 ngx_core_conf_t *ccf;
571 ngx_connection_t *c;
572
573
574 ngx_gettimeofday(&tv);
575
576 ngx_start_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000 + tv.tv_usec / 1000;
577 ngx_old_elapsed_msec = 0;
578 ngx_elapsed_msec = 0;
579
580
581 ngx_process = NGX_PROCESS_WORKER;
582
583 ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);
584
585 if (ccf->group != (gid_t) NGX_CONF_UNSET) {
586 if (setgid(ccf->group) == -1) {
587 ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
588 "setgid(%d) failed", ccf->group);
589 /* fatal */
590 exit(2);
591 }
592 }
593
594 if (ccf->user != (uid_t) NGX_CONF_UNSET) {
595 if (setuid(ccf->user) == -1) {
596 ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
597 "setuid(%d) failed", ccf->user);
598 /* fatal */
599 exit(2);
600 }
601 }
602
603 #if (HAVE_PR_SET_DUMPABLE)
604
605 /* allow coredump after setuid() in Linux 2.4.x */
606
607 if (prctl(PR_SET_DUMPABLE, 1, 0, 0, 0) == -1) {
608 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
609 "prctl(PR_SET_DUMPABLE) failed");
610 }
611
612 #endif
613
614 sigemptyset(&set);
615
616 if (sigprocmask(SIG_SETMASK, &set, NULL) == -1) {
617 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
618 "sigprocmask() failed");
619 }
620
621 ngx_init_temp_number();
622
623 /*
624 * disable deleting previous events for the listening sockets because
625 * in the worker processes there are no events at all at this point
626 */
627 ls = cycle->listening.elts;
628 for (i = 0; i < cycle->listening.nelts; i++) {
629 ls[i].remain = 0;
630 }
631
632 for (i = 0; ngx_modules[i]; i++) {
633 if (ngx_modules[i]->init_process) {
634 if (ngx_modules[i]->init_process(cycle) == NGX_ERROR) {
635 /* fatal */
636 exit(2);
637 }
638 }
639 }
640
641 for (n = 0; n < ngx_last_process; n++) {
642
643 if (ngx_processes[n].pid == -1) {
644 continue;
645 }
646
647 if (n == ngx_process_slot) {
648 continue;
649 }
650
651 if (ngx_processes[n].channel[1] == -1) {
652 continue;
653 }
654
655 if (close(ngx_processes[n].channel[1]) == -1) {
656 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
657 "close() failed");
658 }
659 }
660
661 if (close(ngx_processes[ngx_process_slot].channel[0]) == -1) {
662 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
663 "close() failed");
664 }
665
666 #if 0
667 ngx_last_process = 0;
668 #endif
669
670 if (ngx_add_channel_event(cycle, ngx_channel, NGX_READ_EVENT,
671 ngx_channel_handler) == NGX_ERROR)
672 {
673 /* fatal */
674 exit(2);
675 }
676
677 ngx_setproctitle("worker process");
678
679 #if (NGX_THREADS)
680
681 if (ngx_time_mutex_init(cycle->log) == NGX_ERROR) {
682 /* fatal */
683 exit(2);
684 }
685
686 if (ngx_threads_n) {
687 if (ngx_init_threads(ngx_threads_n,
688 ccf->thread_stack_size, cycle) == NGX_ERROR)
689 {
690 /* fatal */
691 exit(2);
692 }
693
694 err = ngx_thread_key_create(&ngx_core_tls_key);
695 if (err != 0) {
696 ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
697 ngx_thread_key_create_n " failed");
698 /* fatal */
699 exit(2);
700 }
701
702 for (n = 0; n < ngx_threads_n; n++) {
703
704 if (!(ngx_threads[n].cv = ngx_cond_init(cycle->log))) {
705 /* fatal */
706 exit(2);
707 }
708
709 if (ngx_create_thread((ngx_tid_t *) &ngx_threads[n].tid,
710 ngx_worker_thread_cycle,
711 (void *) &ngx_threads[n], cycle->log) != 0)
712 {
713 /* fatal */
714 exit(2);
715 }
716 }
717 }
718
719 #endif
720
721 for ( ;; ) {
722 if (ngx_exiting
723 && ngx_event_timer_rbtree == &ngx_event_timer_sentinel)
724 {
725 ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "exiting");
726
727
728 #if (NGX_THREADS)
729 ngx_terminate = 1;
730
731 ngx_wakeup_worker_threads(cycle);
732 #endif
733
734 /*
735 * we do not destroy cycle->pool here because a signal handler
736 * that uses cycle->log can be called at this point
737 */
738 exit(0);
739 }
740
741 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "worker cycle");
742
743 ngx_process_events(cycle);
744
745 if (ngx_terminate) {
746 ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "exiting");
747
748 #if (NGX_THREADS)
749 ngx_wakeup_worker_threads(cycle);
750 #endif
751
752 /*
753 * we do not destroy cycle->pool here because a signal handler
754 * that uses cycle->log can be called at this point
755 */
756 exit(0);
757 }
758
759 if (ngx_quit) {
760 ngx_quit = 0;
761 ngx_log_error(NGX_LOG_INFO, cycle->log, 0,
762 "gracefully shutting down");
763 ngx_setproctitle("worker process is shutting down");
764
765 if (!ngx_exiting) {
766 ngx_close_listening_sockets(cycle);
767 ngx_exiting = 1;
768 }
769 }
770
771 if (ngx_reopen) {
772 ngx_reopen = 0;
773 ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "reopen logs");
774 ngx_reopen_files(cycle, -1);
775 }
776 }
777 }
778
779
780 static void ngx_channel_handler(ngx_event_t *ev)
781 {
782 ngx_int_t n;
783 ngx_channel_t ch;
784 ngx_connection_t *c;
785
786 c = ev->data;
787
788 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ev->log, 0, "channel handler");
789
790 n = ngx_read_channel(c->fd, &ch, sizeof(ngx_channel_t), ev->log);
791
792 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ev->log, 0, "channel: %d", n);
793
794 if (n <= 0) {
795 return;
796 }
797
798 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ev->log, 0,
799 "channel command: %d", ch.command);
800
801 switch (ch.command) {
802
803 case NGX_CMD_QUIT:
804 ngx_quit = 1;
805 break;
806
807 case NGX_CMD_TERMINATE:
808 ngx_terminate = 1;
809 break;
810
811 case NGX_CMD_REOPEN:
812 ngx_reopen = 1;
813 break;
814
815 case NGX_CMD_OPEN_CHANNEL:
816
817 ngx_log_debug3(NGX_LOG_DEBUG_CORE, ev->log, 0,
818 "get channel s:%d pid:" PID_T_FMT " fd:%d",
819 ch.slot, ch.pid, ch.fd);
820
821 ngx_processes[ch.slot].pid = ch.pid;
822 ngx_processes[ch.slot].channel[0] = ch.fd;
823 break;
824
825 case NGX_CMD_CLOSE_CHANNEL:
826
827 ngx_log_debug4(NGX_LOG_DEBUG_CORE, ev->log, 0,
828 "close channel s:%d pid:" PID_T_FMT " our:" PID_T_FMT
829 " fd:%d",
830 ch.slot, ch.pid, ngx_processes[ch.slot].pid,
831 ngx_processes[ch.slot].channel[0]);
832
833 if (close(ngx_processes[ch.slot].channel[0]) == -1) {
834 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno, "close() failed");
835 }
836
837 ngx_processes[ch.slot].channel[0] = -1;
838 break;
839 }
840 }
841
842
843 #if (NGX_THREADS)
844
845 static void ngx_wakeup_worker_threads(ngx_cycle_t *cycle)
846 {
847 ngx_int_t i;
848 ngx_uint_t live;
849
850 for ( ;; ) {
851
852 live = 0;
853
854 for (i = 0; i < ngx_threads_n; i++) {
855 if (ngx_threads[i].state < NGX_THREAD_EXIT) {
856 ngx_cond_signal(ngx_threads[i].cv);
857
858 if (ngx_threads[i].cv->tid == (ngx_tid_t) -1) {
859 ngx_threads[i].state = NGX_THREAD_DONE;
860 } else {
861 live = 1;
862 }
863 }
864
865 if (ngx_threads[i].state == NGX_THREAD_EXIT) {
866 ngx_thread_join(ngx_threads[i].tid, NULL);
867 ngx_threads[i].state = NGX_THREAD_DONE;
868 }
869 }
870
871 if (live == 0) {
872 ngx_log_debug0(NGX_LOG_DEBUG_CORE, cycle->log, 0,
873 "all worker threads are joined");
874
875 /* STUB */
876 ngx_done_events(cycle);
877 ngx_mutex_destroy(ngx_event_timer_mutex);
878 ngx_mutex_destroy(ngx_posted_events_mutex);
879
880 return;
881 }
882
883 ngx_sched_yield();
884 }
885 }
886
887
888 static void* ngx_worker_thread_cycle(void *data)
889 {
890 ngx_thread_t *thr = data;
891
892 sigset_t set;
893 ngx_err_t err;
894 ngx_core_tls_t *tls;
895 ngx_cycle_t *cycle;
896 struct timeval tv;
897
898 thr->cv->tid = ngx_thread_self();
899
900 cycle = (ngx_cycle_t *) ngx_cycle;
901
902 sigemptyset(&set);
903 sigaddset(&set, ngx_signal_value(NGX_RECONFIGURE_SIGNAL));
904 sigaddset(&set, ngx_signal_value(NGX_REOPEN_SIGNAL));
905 sigaddset(&set, ngx_signal_value(NGX_CHANGEBIN_SIGNAL));
906
907 err = ngx_thread_sigmask(SIG_BLOCK, &set, NULL);
908 if (err) {
909 ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
910 ngx_thread_sigmask_n " failed");
911 return (void *) 1;
912 }
913
914 ngx_log_debug1(NGX_LOG_DEBUG_CORE, cycle->log, 0,
915 "thread " TID_T_FMT " started", ngx_thread_self());
916
917 ngx_setthrtitle("worker thread");
918
919 if (!(tls = ngx_calloc(sizeof(ngx_core_tls_t), cycle->log))) {
920 return (void *) 1;
921 }
922
923 err = ngx_thread_set_tls(ngx_core_tls_key, tls);
924 if (err != 0) {
925 ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
926 ngx_thread_set_tls_n " failed");
927 return (void *) 1;
928 }
929
930 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
931 return (void *) 1;
932 }
933
934 for ( ;; ) {
935 thr->state = NGX_THREAD_FREE;
936
937 if (ngx_cond_wait(thr->cv, ngx_posted_events_mutex) == NGX_ERROR) {
938 return (void *) 1;
939 }
940
941 if (ngx_terminate) {
942 thr->state = NGX_THREAD_EXIT;
943
944 ngx_mutex_unlock(ngx_posted_events_mutex);
945
946 ngx_log_debug1(NGX_LOG_DEBUG_CORE, cycle->log, 0,
947 "thread %d is done", ngx_thread_self());
948
949 return (void *) 0;
950 }
951
952 thr->state = NGX_THREAD_BUSY;
953
954 if (ngx_event_thread_process_posted(cycle) == NGX_ERROR) {
955 return (void *) 1;
956 }
957
958 if (ngx_event_thread_process_posted(cycle) == NGX_ERROR) {
959 return (void *) 1;
960 }
961
962 if (ngx_process_changes) {
963 if (ngx_process_changes(cycle, 1) == NGX_ERROR) {
964 return (void *) 1;
965 }
966 }
967 }
968 }
969
970 #endif