port: no eventfd support on FreeBSD
[lttng-tools.git] / src / bin / lttng-sessiond / rotation-thread.c
1 /*
2 * Copyright (C) 2017 Julien Desfossez <jdesfossez@efficios.com>
3 * Copyright (C) 2018 Jérémie Galarneau <jeremie.galarneau@efficios.com>
4 *
5 * SPDX-License-Identifier: GPL-2.0-only
6 *
7 */
8
9 #define _LGPL_SOURCE
10 #include <lttng/trigger/trigger.h>
11 #include <common/error.h>
12 #include <common/config/session-config.h>
13 #include <common/defaults.h>
14 #include <common/utils.h>
15 #include <common/futex.h>
16 #include <common/align.h>
17 #include <common/time.h>
18 #include <common/hashtable/utils.h>
19 #include <sys/stat.h>
20 #include <time.h>
21 #include <signal.h>
22 #include <inttypes.h>
23
24 #include <common/kernel-ctl/kernel-ctl.h>
25 #include <lttng/notification/channel-internal.h>
26 #include <lttng/rotate-internal.h>
27
28 #include "rotation-thread.h"
29 #include "lttng-sessiond.h"
30 #include "health-sessiond.h"
31 #include "rotate.h"
32 #include "cmd.h"
33 #include "session.h"
34 #include "timer.h"
35 #include "notification-thread-commands.h"
36 #include "utils.h"
37 #include "thread.h"
38
39 #include <urcu.h>
40 #include <urcu/list.h>
41
42 struct lttng_notification_channel *rotate_notification_channel = NULL;
43
44 struct rotation_thread {
45 struct lttng_poll_event events;
46 };
47
48 struct rotation_thread_job {
49 enum rotation_thread_job_type type;
50 struct ltt_session *session;
51 /* List member in struct rotation_thread_timer_queue. */
52 struct cds_list_head head;
53 };
54
55 /*
56 * The timer thread enqueues jobs and wakes up the rotation thread.
57 * When the rotation thread wakes up, it empties the queue.
58 */
59 struct rotation_thread_timer_queue {
60 struct lttng_pipe *event_pipe;
61 struct cds_list_head list;
62 pthread_mutex_t lock;
63 };
64
65 struct rotation_thread_handle {
66 struct rotation_thread_timer_queue *rotation_timer_queue;
67 /* Access to the notification thread cmd_queue */
68 struct notification_thread_handle *notification_thread_handle;
69 /* Thread-specific quit pipe. */
70 struct lttng_pipe *quit_pipe;
71 };
72
73 static
74 const char *get_job_type_str(enum rotation_thread_job_type job_type)
75 {
76 switch (job_type) {
77 case ROTATION_THREAD_JOB_TYPE_CHECK_PENDING_ROTATION:
78 return "CHECK_PENDING_ROTATION";
79 case ROTATION_THREAD_JOB_TYPE_SCHEDULED_ROTATION:
80 return "SCHEDULED_ROTATION";
81 default:
82 abort();
83 }
84 }
85
86 struct rotation_thread_timer_queue *rotation_thread_timer_queue_create(void)
87 {
88 struct rotation_thread_timer_queue *queue = NULL;
89
90 queue = zmalloc(sizeof(*queue));
91 if (!queue) {
92 PERROR("Failed to allocate timer rotate queue");
93 goto end;
94 }
95
96 queue->event_pipe = lttng_pipe_open(FD_CLOEXEC | O_NONBLOCK);
97 CDS_INIT_LIST_HEAD(&queue->list);
98 pthread_mutex_init(&queue->lock, NULL);
99 end:
100 return queue;
101 }
102
103 void rotation_thread_timer_queue_destroy(
104 struct rotation_thread_timer_queue *queue)
105 {
106 if (!queue) {
107 return;
108 }
109
110 lttng_pipe_destroy(queue->event_pipe);
111
112 pthread_mutex_lock(&queue->lock);
113 assert(cds_list_empty(&queue->list));
114 pthread_mutex_unlock(&queue->lock);
115 pthread_mutex_destroy(&queue->lock);
116 free(queue);
117 }
118
119 /*
120 * Destroy the thread data previously created by the init function.
121 */
122 void rotation_thread_handle_destroy(
123 struct rotation_thread_handle *handle)
124 {
125 lttng_pipe_destroy(handle->quit_pipe);
126 free(handle);
127 }
128
129 struct rotation_thread_handle *rotation_thread_handle_create(
130 struct rotation_thread_timer_queue *rotation_timer_queue,
131 struct notification_thread_handle *notification_thread_handle)
132 {
133 struct rotation_thread_handle *handle;
134
135 handle = zmalloc(sizeof(*handle));
136 if (!handle) {
137 goto end;
138 }
139
140 handle->rotation_timer_queue = rotation_timer_queue;
141 handle->notification_thread_handle = notification_thread_handle;
142 handle->quit_pipe = lttng_pipe_open(FD_CLOEXEC);
143 if (!handle->quit_pipe) {
144 goto error;
145 }
146
147 end:
148 return handle;
149 error:
150 rotation_thread_handle_destroy(handle);
151 return NULL;
152 }
153
154 /*
155 * Called with the rotation_thread_timer_queue lock held.
156 * Return true if the same timer job already exists in the queue, false if not.
157 */
158 static
159 bool timer_job_exists(const struct rotation_thread_timer_queue *queue,
160 enum rotation_thread_job_type job_type,
161 struct ltt_session *session)
162 {
163 bool exists = false;
164 struct rotation_thread_job *job;
165
166 cds_list_for_each_entry(job, &queue->list, head) {
167 if (job->session == session && job->type == job_type) {
168 exists = true;
169 goto end;
170 }
171 }
172 end:
173 return exists;
174 }
175
176 void rotation_thread_enqueue_job(struct rotation_thread_timer_queue *queue,
177 enum rotation_thread_job_type job_type,
178 struct ltt_session *session)
179 {
180 int ret;
181 const char dummy = '!';
182 struct rotation_thread_job *job = NULL;
183 const char *job_type_str = get_job_type_str(job_type);
184
185 pthread_mutex_lock(&queue->lock);
186 if (timer_job_exists(queue, job_type, session)) {
187 /*
188 * This timer job is already pending, we don't need to add
189 * it.
190 */
191 goto end;
192 }
193
194 job = zmalloc(sizeof(struct rotation_thread_job));
195 if (!job) {
196 PERROR("Failed to allocate rotation thread job of type \"%s\" for session \"%s\"",
197 job_type_str, session->name);
198 goto end;
199 }
200 /* No reason for this to fail as the caller must hold a reference. */
201 (void) session_get(session);
202
203 job->session = session;
204 job->type = job_type;
205 cds_list_add_tail(&job->head, &queue->list);
206
207 ret = lttng_write(lttng_pipe_get_writefd(queue->event_pipe), &dummy,
208 sizeof(dummy));
209 if (ret < 0) {
210 /*
211 * We do not want to block in the timer handler, the job has
212 * been enqueued in the list, the wakeup pipe is probably full,
213 * the job will be processed when the rotation_thread catches
214 * up.
215 */
216 if (errno == EAGAIN || errno == EWOULDBLOCK) {
217 /*
218 * Not an error, but would be surprising and indicate
219 * that the rotation thread can't keep up with the
220 * current load.
221 */
222 DBG("Wake-up pipe of rotation thread job queue is full");
223 goto end;
224 }
225 PERROR("Failed to wake-up the rotation thread after pushing a job of type \"%s\" for session \"%s\"",
226 job_type_str, session->name);
227 goto end;
228 }
229
230 end:
231 pthread_mutex_unlock(&queue->lock);
232 }
233
234 static
235 int init_poll_set(struct lttng_poll_event *poll_set,
236 struct rotation_thread_handle *handle)
237 {
238 int ret;
239
240 /*
241 * Create pollset with size 3:
242 * - rotation thread quit pipe,
243 * - rotation thread timer queue pipe,
244 * - notification channel sock,
245 */
246 ret = lttng_poll_create(poll_set, 5, LTTNG_CLOEXEC);
247 if (ret < 0) {
248 goto error;
249 }
250
251 ret = lttng_poll_add(poll_set,
252 lttng_pipe_get_readfd(handle->quit_pipe),
253 LPOLLIN | LPOLLERR);
254 if (ret < 0) {
255 ERR("[rotation-thread] Failed to add quit pipe read fd to poll set");
256 goto error;
257 }
258
259 ret = lttng_poll_add(poll_set,
260 lttng_pipe_get_readfd(handle->rotation_timer_queue->event_pipe),
261 LPOLLIN | LPOLLERR);
262 if (ret < 0) {
263 ERR("[rotation-thread] Failed to add rotate_pending fd to poll set");
264 goto error;
265 }
266
267 return ret;
268 error:
269 lttng_poll_clean(poll_set);
270 return ret;
271 }
272
273 static
274 void fini_thread_state(struct rotation_thread *state)
275 {
276 lttng_poll_clean(&state->events);
277 if (rotate_notification_channel) {
278 lttng_notification_channel_destroy(rotate_notification_channel);
279 }
280 }
281
282 static
283 int init_thread_state(struct rotation_thread_handle *handle,
284 struct rotation_thread *state)
285 {
286 int ret;
287
288 memset(state, 0, sizeof(*state));
289 lttng_poll_init(&state->events);
290
291 ret = init_poll_set(&state->events, handle);
292 if (ret) {
293 ERR("[rotation-thread] Failed to initialize rotation thread poll set");
294 goto end;
295 }
296
297 rotate_notification_channel = lttng_notification_channel_create(
298 lttng_session_daemon_notification_endpoint);
299 if (!rotate_notification_channel) {
300 ERR("[rotation-thread] Could not create notification channel");
301 ret = -1;
302 goto end;
303 }
304 ret = lttng_poll_add(&state->events, rotate_notification_channel->socket,
305 LPOLLIN | LPOLLERR);
306 if (ret < 0) {
307 ERR("[rotation-thread] Failed to add notification fd to pollset");
308 goto end;
309 }
310
311 end:
312 return ret;
313 }
314
315 static
316 void check_session_rotation_pending_on_consumers(struct ltt_session *session,
317 bool *_rotation_completed)
318 {
319 int ret = 0;
320 struct consumer_socket *socket;
321 struct cds_lfht_iter iter;
322 enum consumer_trace_chunk_exists_status exists_status;
323 uint64_t relayd_id;
324 bool chunk_exists_on_peer = false;
325 enum lttng_trace_chunk_status chunk_status;
326
327 assert(session->chunk_being_archived);
328
329 /*
330 * Check for a local pending rotation on all consumers (32-bit
331 * user space, 64-bit user space, and kernel).
332 */
333 rcu_read_lock();
334 if (!session->ust_session) {
335 goto skip_ust;
336 }
337 cds_lfht_for_each_entry(session->ust_session->consumer->socks->ht,
338 &iter, socket, node.node) {
339 relayd_id = session->ust_session->consumer->type == CONSUMER_DST_LOCAL ?
340 -1ULL :
341 session->ust_session->consumer->net_seq_index;
342
343 pthread_mutex_lock(socket->lock);
344 ret = consumer_trace_chunk_exists(socket,
345 relayd_id,
346 session->id, session->chunk_being_archived,
347 &exists_status);
348 if (ret) {
349 pthread_mutex_unlock(socket->lock);
350 ERR("Error occurred while checking rotation status on consumer daemon");
351 goto end;
352 }
353
354 if (exists_status != CONSUMER_TRACE_CHUNK_EXISTS_STATUS_UNKNOWN_CHUNK) {
355 pthread_mutex_unlock(socket->lock);
356 chunk_exists_on_peer = true;
357 goto end;
358 }
359 pthread_mutex_unlock(socket->lock);
360 }
361
362 skip_ust:
363 if (!session->kernel_session) {
364 goto skip_kernel;
365 }
366 cds_lfht_for_each_entry(session->kernel_session->consumer->socks->ht,
367 &iter, socket, node.node) {
368 pthread_mutex_lock(socket->lock);
369 relayd_id = session->kernel_session->consumer->type == CONSUMER_DST_LOCAL ?
370 -1ULL :
371 session->kernel_session->consumer->net_seq_index;
372
373 ret = consumer_trace_chunk_exists(socket,
374 relayd_id,
375 session->id, session->chunk_being_archived,
376 &exists_status);
377 if (ret) {
378 pthread_mutex_unlock(socket->lock);
379 ERR("Error occurred while checking rotation status on consumer daemon");
380 goto end;
381 }
382
383 if (exists_status != CONSUMER_TRACE_CHUNK_EXISTS_STATUS_UNKNOWN_CHUNK) {
384 pthread_mutex_unlock(socket->lock);
385 chunk_exists_on_peer = true;
386 goto end;
387 }
388 pthread_mutex_unlock(socket->lock);
389 }
390 skip_kernel:
391 end:
392 rcu_read_unlock();
393
394 if (!chunk_exists_on_peer) {
395 uint64_t chunk_being_archived_id;
396
397 chunk_status = lttng_trace_chunk_get_id(
398 session->chunk_being_archived,
399 &chunk_being_archived_id);
400 assert(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK);
401 DBG("[rotation-thread] Rotation of trace archive %" PRIu64 " of session \"%s\" is complete on all consumers",
402 chunk_being_archived_id,
403 session->name);
404 }
405 *_rotation_completed = !chunk_exists_on_peer;
406 if (ret) {
407 ret = session_reset_rotation_state(session,
408 LTTNG_ROTATION_STATE_ERROR);
409 if (ret) {
410 ERR("Failed to reset rotation state of session \"%s\"",
411 session->name);
412 }
413 }
414 }
415
416 /*
417 * Check if the last rotation was completed, called with session lock held.
418 * Should only return non-zero in the event of a fatal error. Doing so will
419 * shutdown the thread.
420 */
421 static
422 int check_session_rotation_pending(struct ltt_session *session,
423 struct notification_thread_handle *notification_thread_handle)
424 {
425 int ret;
426 struct lttng_trace_archive_location *location;
427 enum lttng_trace_chunk_status chunk_status;
428 bool rotation_completed = false;
429 const char *archived_chunk_name;
430 uint64_t chunk_being_archived_id;
431
432 if (!session->chunk_being_archived) {
433 ret = 0;
434 goto end;
435 }
436
437 chunk_status = lttng_trace_chunk_get_id(session->chunk_being_archived,
438 &chunk_being_archived_id);
439 assert(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK);
440
441 DBG("[rotation-thread] Checking for pending rotation on session \"%s\", trace archive %" PRIu64,
442 session->name, chunk_being_archived_id);
443
444 /*
445 * The rotation-pending check timer of a session is launched in
446 * one-shot mode. If the rotation is incomplete, the rotation
447 * thread will re-enable the pending-check timer.
448 *
449 * The timer thread can't stop the timer itself since it is involved
450 * in the check for the timer's quiescence.
451 */
452 ret = timer_session_rotation_pending_check_stop(session);
453 if (ret) {
454 goto check_ongoing_rotation;
455 }
456
457 check_session_rotation_pending_on_consumers(session,
458 &rotation_completed);
459 if (!rotation_completed ||
460 session->rotation_state == LTTNG_ROTATION_STATE_ERROR) {
461 goto check_ongoing_rotation;
462 }
463
464 /*
465 * Now we can clear the "ONGOING" state in the session. New
466 * rotations can start now.
467 */
468 chunk_status = lttng_trace_chunk_get_name(session->chunk_being_archived,
469 &archived_chunk_name, NULL);
470 assert(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK);
471 free(session->last_archived_chunk_name);
472 session->last_archived_chunk_name = strdup(archived_chunk_name);
473 if (!session->last_archived_chunk_name) {
474 PERROR("Failed to duplicate archived chunk name");
475 }
476 session_reset_rotation_state(session, LTTNG_ROTATION_STATE_COMPLETED);
477
478 if (!session->quiet_rotation) {
479 location = session_get_trace_archive_location(session);
480 /* Ownership of location is transferred. */
481 ret = notification_thread_command_session_rotation_completed(
482 notification_thread_handle,
483 session->name,
484 session->uid,
485 session->gid,
486 session->last_archived_chunk_id.value,
487 location);
488 if (ret != LTTNG_OK) {
489 ERR("[rotation-thread] Failed to notify notification thread of completed rotation for session %s",
490 session->name);
491 }
492 }
493
494 ret = 0;
495 check_ongoing_rotation:
496 if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING) {
497 uint64_t chunk_being_archived_id;
498
499 chunk_status = lttng_trace_chunk_get_id(
500 session->chunk_being_archived,
501 &chunk_being_archived_id);
502 assert(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK);
503
504 DBG("[rotation-thread] Rotation of trace archive %" PRIu64 " is still pending for session %s",
505 chunk_being_archived_id, session->name);
506 ret = timer_session_rotation_pending_check_start(session,
507 DEFAULT_ROTATE_PENDING_TIMER);
508 if (ret) {
509 ERR("Failed to re-enable rotation pending timer");
510 ret = -1;
511 goto end;
512 }
513 }
514
515 end:
516 return ret;
517 }
518
519 /* Call with the session and session_list locks held. */
520 static
521 int launch_session_rotation(struct ltt_session *session)
522 {
523 int ret;
524 struct lttng_rotate_session_return rotation_return;
525
526 DBG("[rotation-thread] Launching scheduled time-based rotation on session \"%s\"",
527 session->name);
528
529 ret = cmd_rotate_session(session, &rotation_return, false,
530 LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED);
531 if (ret == LTTNG_OK) {
532 DBG("[rotation-thread] Scheduled time-based rotation successfully launched on session \"%s\"",
533 session->name);
534 } else {
535 /* Don't consider errors as fatal. */
536 DBG("[rotation-thread] Scheduled time-based rotation aborted for session %s: %s",
537 session->name, lttng_strerror(ret));
538 }
539 return 0;
540 }
541
542 static
543 int run_job(struct rotation_thread_job *job, struct ltt_session *session,
544 struct notification_thread_handle *notification_thread_handle)
545 {
546 int ret;
547
548 switch (job->type) {
549 case ROTATION_THREAD_JOB_TYPE_SCHEDULED_ROTATION:
550 ret = launch_session_rotation(session);
551 break;
552 case ROTATION_THREAD_JOB_TYPE_CHECK_PENDING_ROTATION:
553 ret = check_session_rotation_pending(session,
554 notification_thread_handle);
555 break;
556 default:
557 abort();
558 }
559 return ret;
560 }
561
562 static
563 int handle_job_queue(struct rotation_thread_handle *handle,
564 struct rotation_thread *state,
565 struct rotation_thread_timer_queue *queue)
566 {
567 int ret = 0;
568
569 for (;;) {
570 struct ltt_session *session;
571 struct rotation_thread_job *job;
572
573 /* Take the queue lock only to pop an element from the list. */
574 pthread_mutex_lock(&queue->lock);
575 if (cds_list_empty(&queue->list)) {
576 pthread_mutex_unlock(&queue->lock);
577 break;
578 }
579 job = cds_list_first_entry(&queue->list,
580 typeof(*job), head);
581 cds_list_del(&job->head);
582 pthread_mutex_unlock(&queue->lock);
583
584 session_lock_list();
585 session = job->session;
586 if (!session) {
587 DBG("[rotation-thread] Session \"%s\" not found",
588 session->name);
589 /*
590 * This is a non-fatal error, and we cannot report it to
591 * the user (timer), so just print the error and
592 * continue the processing.
593 *
594 * While the timer thread will purge pending signals for
595 * a session on the session's destruction, it is
596 * possible for a job targeting that session to have
597 * already been queued before it was destroyed.
598 */
599 free(job);
600 session_put(session);
601 session_unlock_list();
602 continue;
603 }
604
605 session_lock(session);
606 ret = run_job(job, session, handle->notification_thread_handle);
607 session_unlock(session);
608 /* Release reference held by the job. */
609 session_put(session);
610 session_unlock_list();
611 free(job);
612 if (ret) {
613 goto end;
614 }
615 }
616
617 ret = 0;
618
619 end:
620 return ret;
621 }
622
623 static
624 int handle_condition(const struct lttng_condition *condition,
625 const struct lttng_evaluation *evaluation,
626 struct notification_thread_handle *notification_thread_handle)
627 {
628 int ret = 0;
629 const char *condition_session_name = NULL;
630 enum lttng_condition_type condition_type;
631 enum lttng_condition_status condition_status;
632 enum lttng_evaluation_status evaluation_status;
633 uint64_t consumed;
634 struct ltt_session *session;
635
636 condition_type = lttng_condition_get_type(condition);
637
638 if (condition_type != LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE) {
639 ret = -1;
640 ERR("[rotation-thread] Condition type and session usage type are not the same");
641 goto end;
642 }
643
644 /* Fetch info to test */
645 condition_status = lttng_condition_session_consumed_size_get_session_name(
646 condition, &condition_session_name);
647 if (condition_status != LTTNG_CONDITION_STATUS_OK) {
648 ERR("[rotation-thread] Session name could not be fetched");
649 ret = -1;
650 goto end;
651 }
652 evaluation_status = lttng_evaluation_session_consumed_size_get_consumed_size(evaluation,
653 &consumed);
654 if (evaluation_status != LTTNG_EVALUATION_STATUS_OK) {
655 ERR("[rotation-thread] Failed to get evaluation");
656 ret = -1;
657 goto end;
658 }
659
660 session_lock_list();
661 session = session_find_by_name(condition_session_name);
662 if (!session) {
663 ret = -1;
664 session_unlock_list();
665 ERR("[rotation-thread] Session \"%s\" not found",
666 condition_session_name);
667 goto end;
668 }
669 session_lock(session);
670
671 ret = unsubscribe_session_consumed_size_rotation(session,
672 notification_thread_handle);
673 if (ret) {
674 goto end_unlock;
675 }
676
677 ret = cmd_rotate_session(session, NULL, false,
678 LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED);
679 if (ret == -LTTNG_ERR_ROTATION_PENDING) {
680 DBG("Rotate already pending, subscribe to the next threshold value");
681 } else if (ret != LTTNG_OK) {
682 ERR("[rotation-thread] Failed to rotate on size notification with error: %s",
683 lttng_strerror(ret));
684 ret = -1;
685 goto end_unlock;
686 }
687 ret = subscribe_session_consumed_size_rotation(session,
688 consumed + session->rotate_size,
689 notification_thread_handle);
690 if (ret) {
691 ERR("[rotation-thread] Failed to subscribe to session consumed size condition");
692 goto end_unlock;
693 }
694 ret = 0;
695
696 end_unlock:
697 session_unlock(session);
698 session_put(session);
699 session_unlock_list();
700 end:
701 return ret;
702 }
703
704 static
705 int handle_notification_channel(int fd,
706 struct rotation_thread_handle *handle,
707 struct rotation_thread *state)
708 {
709 int ret;
710 bool notification_pending;
711 struct lttng_notification *notification = NULL;
712 enum lttng_notification_channel_status status;
713 const struct lttng_evaluation *notification_evaluation;
714 const struct lttng_condition *notification_condition;
715
716 status = lttng_notification_channel_has_pending_notification(
717 rotate_notification_channel, &notification_pending);
718 if (status != LTTNG_NOTIFICATION_CHANNEL_STATUS_OK) {
719 ERR("[rotation-thread ]Error occurred while checking for pending notification");
720 ret = -1;
721 goto end;
722 }
723
724 if (!notification_pending) {
725 ret = 0;
726 goto end;
727 }
728
729 /* Receive the next notification. */
730 status = lttng_notification_channel_get_next_notification(
731 rotate_notification_channel,
732 &notification);
733
734 switch (status) {
735 case LTTNG_NOTIFICATION_CHANNEL_STATUS_OK:
736 break;
737 case LTTNG_NOTIFICATION_CHANNEL_STATUS_NOTIFICATIONS_DROPPED:
738 /* Not an error, we will wait for the next one */
739 ret = 0;
740 goto end;;
741 case LTTNG_NOTIFICATION_CHANNEL_STATUS_CLOSED:
742 ERR("Notification channel was closed");
743 ret = -1;
744 goto end;
745 default:
746 /* Unhandled conditions / errors. */
747 ERR("Unknown notification channel status");
748 ret = -1;
749 goto end;
750 }
751
752 notification_condition = lttng_notification_get_condition(notification);
753 notification_evaluation = lttng_notification_get_evaluation(notification);
754
755 ret = handle_condition(notification_condition, notification_evaluation,
756 handle->notification_thread_handle);
757
758 end:
759 lttng_notification_destroy(notification);
760 return ret;
761 }
762
763 static
764 void *thread_rotation(void *data)
765 {
766 int ret;
767 struct rotation_thread_handle *handle = data;
768 struct rotation_thread thread;
769 int queue_pipe_fd;
770
771 DBG("[rotation-thread] Started rotation thread");
772 rcu_register_thread();
773 rcu_thread_online();
774 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_ROTATION);
775 health_code_update();
776
777 if (!handle) {
778 ERR("[rotation-thread] Invalid thread context provided");
779 goto end;
780 }
781
782 queue_pipe_fd = lttng_pipe_get_readfd(
783 handle->rotation_timer_queue->event_pipe);
784
785
786 ret = init_thread_state(handle, &thread);
787 if (ret) {
788 goto error;
789 }
790
791 while (true) {
792 int fd_count, i;
793
794 health_poll_entry();
795 DBG("[rotation-thread] Entering poll wait");
796 ret = lttng_poll_wait(&thread.events, -1);
797 DBG("[rotation-thread] Poll wait returned (%i)", ret);
798 health_poll_exit();
799 if (ret < 0) {
800 /*
801 * Restart interrupted system call.
802 */
803 if (errno == EINTR) {
804 continue;
805 }
806 ERR("[rotation-thread] Error encountered during lttng_poll_wait (%i)", ret);
807 goto error;
808 }
809
810 fd_count = ret;
811 for (i = 0; i < fd_count; i++) {
812 int fd = LTTNG_POLL_GETFD(&thread.events, i);
813 uint32_t revents = LTTNG_POLL_GETEV(&thread.events, i);
814
815 DBG("[rotation-thread] Handling fd (%i) activity (%u)",
816 fd, revents);
817
818 if (revents & LPOLLERR) {
819 ERR("[rotation-thread] Polling returned an error on fd %i", fd);
820 goto error;
821 }
822
823 if (fd == rotate_notification_channel->socket) {
824 ret = handle_notification_channel(fd, handle,
825 &thread);
826 if (ret) {
827 ERR("[rotation-thread] Error occurred while handling activity on notification channel socket");
828 goto error;
829 }
830 } else {
831 /* Job queue or quit pipe activity. */
832
833 /*
834 * The job queue is serviced if there is
835 * activity on the quit pipe to ensure it is
836 * flushed and all references held in the queue
837 * are released.
838 */
839 ret = handle_job_queue(handle, &thread,
840 handle->rotation_timer_queue);
841 if (ret) {
842 ERR("[rotation-thread] Failed to handle rotation timer pipe event");
843 goto error;
844 }
845
846 if (fd == queue_pipe_fd) {
847 char buf;
848
849 ret = lttng_read(fd, &buf, 1);
850 if (ret != 1) {
851 ERR("[rotation-thread] Failed to read from wakeup pipe (fd = %i)", fd);
852 goto error;
853 }
854 } else {
855 DBG("[rotation-thread] Quit pipe activity");
856 goto exit;
857 }
858 }
859 }
860 }
861 exit:
862 error:
863 DBG("[rotation-thread] Exit");
864 fini_thread_state(&thread);
865 end:
866 health_unregister(health_sessiond);
867 rcu_thread_offline();
868 rcu_unregister_thread();
869 return NULL;
870 }
871
872 static
873 bool shutdown_rotation_thread(void *thread_data)
874 {
875 struct rotation_thread_handle *handle = thread_data;
876 const int write_fd = lttng_pipe_get_writefd(handle->quit_pipe);
877
878 return notify_thread_pipe(write_fd) == 1;
879 }
880
881 bool launch_rotation_thread(struct rotation_thread_handle *handle)
882 {
883 struct lttng_thread *thread;
884
885 thread = lttng_thread_create("Rotation",
886 thread_rotation,
887 shutdown_rotation_thread,
888 NULL,
889 handle);
890 if (!thread) {
891 goto error;
892 }
893 lttng_thread_put(thread);
894 return true;
895 error:
896 return false;
897 }
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