ecc4c3ea730513a16845dc42dd1aacecc798fb27
[lttng-tools.git] / src / bin / lttng-sessiond / rotation-thread.cpp
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 #include <lttng/location-internal.h>
28 #include <lttng/condition/condition-internal.h>
29
30 #include "rotation-thread.h"
31 #include "lttng-sessiond.h"
32 #include "health-sessiond.h"
33 #include "rotate.h"
34 #include "cmd.h"
35 #include "session.h"
36 #include "timer.h"
37 #include "notification-thread-commands.h"
38 #include "utils.h"
39 #include "thread.h"
40
41 #include <urcu.h>
42 #include <urcu/list.h>
43
44 struct lttng_notification_channel *rotate_notification_channel = NULL;
45
46 struct rotation_thread {
47 struct lttng_poll_event events;
48 };
49
50 struct rotation_thread_job {
51 enum rotation_thread_job_type type;
52 struct ltt_session *session;
53 /* List member in struct rotation_thread_timer_queue. */
54 struct cds_list_head head;
55 };
56
57 /*
58 * The timer thread enqueues jobs and wakes up the rotation thread.
59 * When the rotation thread wakes up, it empties the queue.
60 */
61 struct rotation_thread_timer_queue {
62 struct lttng_pipe *event_pipe;
63 struct cds_list_head list;
64 pthread_mutex_t lock;
65 };
66
67 struct rotation_thread_handle {
68 struct rotation_thread_timer_queue *rotation_timer_queue;
69 /* Access to the notification thread cmd_queue */
70 struct notification_thread_handle *notification_thread_handle;
71 /* Thread-specific quit pipe. */
72 struct lttng_pipe *quit_pipe;
73 };
74
75 static
76 const char *get_job_type_str(enum rotation_thread_job_type job_type)
77 {
78 switch (job_type) {
79 case ROTATION_THREAD_JOB_TYPE_CHECK_PENDING_ROTATION:
80 return "CHECK_PENDING_ROTATION";
81 case ROTATION_THREAD_JOB_TYPE_SCHEDULED_ROTATION:
82 return "SCHEDULED_ROTATION";
83 default:
84 abort();
85 }
86 }
87
88 struct rotation_thread_timer_queue *rotation_thread_timer_queue_create(void)
89 {
90 struct rotation_thread_timer_queue *queue = NULL;
91
92 queue = (rotation_thread_timer_queue *) zmalloc(sizeof(*queue));
93 if (!queue) {
94 PERROR("Failed to allocate timer rotate queue");
95 goto end;
96 }
97
98 queue->event_pipe = lttng_pipe_open(FD_CLOEXEC | O_NONBLOCK);
99 CDS_INIT_LIST_HEAD(&queue->list);
100 pthread_mutex_init(&queue->lock, NULL);
101 end:
102 return queue;
103 }
104
105 void rotation_thread_timer_queue_destroy(
106 struct rotation_thread_timer_queue *queue)
107 {
108 if (!queue) {
109 return;
110 }
111
112 lttng_pipe_destroy(queue->event_pipe);
113
114 pthread_mutex_lock(&queue->lock);
115 LTTNG_ASSERT(cds_list_empty(&queue->list));
116 pthread_mutex_unlock(&queue->lock);
117 pthread_mutex_destroy(&queue->lock);
118 free(queue);
119 }
120
121 /*
122 * Destroy the thread data previously created by the init function.
123 */
124 void rotation_thread_handle_destroy(
125 struct rotation_thread_handle *handle)
126 {
127 lttng_pipe_destroy(handle->quit_pipe);
128 free(handle);
129 }
130
131 struct rotation_thread_handle *rotation_thread_handle_create(
132 struct rotation_thread_timer_queue *rotation_timer_queue,
133 struct notification_thread_handle *notification_thread_handle)
134 {
135 struct rotation_thread_handle *handle;
136
137 handle = (rotation_thread_handle *) zmalloc(sizeof(*handle));
138 if (!handle) {
139 goto end;
140 }
141
142 handle->rotation_timer_queue = rotation_timer_queue;
143 handle->notification_thread_handle = notification_thread_handle;
144 handle->quit_pipe = lttng_pipe_open(FD_CLOEXEC);
145 if (!handle->quit_pipe) {
146 goto error;
147 }
148
149 end:
150 return handle;
151 error:
152 rotation_thread_handle_destroy(handle);
153 return NULL;
154 }
155
156 /*
157 * Called with the rotation_thread_timer_queue lock held.
158 * Return true if the same timer job already exists in the queue, false if not.
159 */
160 static
161 bool timer_job_exists(const struct rotation_thread_timer_queue *queue,
162 enum rotation_thread_job_type job_type,
163 struct ltt_session *session)
164 {
165 bool exists = false;
166 struct rotation_thread_job *job;
167
168 cds_list_for_each_entry(job, &queue->list, head) {
169 if (job->session == session && job->type == job_type) {
170 exists = true;
171 goto end;
172 }
173 }
174 end:
175 return exists;
176 }
177
178 void rotation_thread_enqueue_job(struct rotation_thread_timer_queue *queue,
179 enum rotation_thread_job_type job_type,
180 struct ltt_session *session)
181 {
182 int ret;
183 const char dummy = '!';
184 struct rotation_thread_job *job = NULL;
185 const char *job_type_str = get_job_type_str(job_type);
186
187 pthread_mutex_lock(&queue->lock);
188 if (timer_job_exists(queue, job_type, session)) {
189 /*
190 * This timer job is already pending, we don't need to add
191 * it.
192 */
193 goto end;
194 }
195
196 job = (rotation_thread_job *) zmalloc(sizeof(struct rotation_thread_job));
197 if (!job) {
198 PERROR("Failed to allocate rotation thread job of type \"%s\" for session \"%s\"",
199 job_type_str, session->name);
200 goto end;
201 }
202 /* No reason for this to fail as the caller must hold a reference. */
203 (void) session_get(session);
204
205 job->session = session;
206 job->type = job_type;
207 cds_list_add_tail(&job->head, &queue->list);
208
209 ret = lttng_write(lttng_pipe_get_writefd(queue->event_pipe), &dummy,
210 sizeof(dummy));
211 if (ret < 0) {
212 /*
213 * We do not want to block in the timer handler, the job has
214 * been enqueued in the list, the wakeup pipe is probably full,
215 * the job will be processed when the rotation_thread catches
216 * up.
217 */
218 if (errno == EAGAIN || errno == EWOULDBLOCK) {
219 /*
220 * Not an error, but would be surprising and indicate
221 * that the rotation thread can't keep up with the
222 * current load.
223 */
224 DBG("Wake-up pipe of rotation thread job queue is full");
225 goto end;
226 }
227 PERROR("Failed to wake-up the rotation thread after pushing a job of type \"%s\" for session \"%s\"",
228 job_type_str, session->name);
229 goto end;
230 }
231
232 end:
233 pthread_mutex_unlock(&queue->lock);
234 }
235
236 static
237 int init_poll_set(struct lttng_poll_event *poll_set,
238 struct rotation_thread_handle *handle)
239 {
240 int ret;
241
242 /*
243 * Create pollset with size 3:
244 * - rotation thread quit pipe,
245 * - rotation thread timer queue pipe,
246 * - notification channel sock,
247 */
248 ret = lttng_poll_create(poll_set, 5, LTTNG_CLOEXEC);
249 if (ret < 0) {
250 goto error;
251 }
252
253 ret = lttng_poll_add(poll_set,
254 lttng_pipe_get_readfd(handle->quit_pipe),
255 LPOLLIN | LPOLLERR);
256 if (ret < 0) {
257 ERR("Failed to add quit pipe read fd to poll set");
258 goto error;
259 }
260
261 ret = lttng_poll_add(poll_set,
262 lttng_pipe_get_readfd(handle->rotation_timer_queue->event_pipe),
263 LPOLLIN | LPOLLERR);
264 if (ret < 0) {
265 ERR("Failed to add rotate_pending fd to poll set");
266 goto error;
267 }
268
269 return ret;
270 error:
271 lttng_poll_clean(poll_set);
272 return ret;
273 }
274
275 static
276 void fini_thread_state(struct rotation_thread *state)
277 {
278 lttng_poll_clean(&state->events);
279 if (rotate_notification_channel) {
280 lttng_notification_channel_destroy(rotate_notification_channel);
281 }
282 }
283
284 static
285 int init_thread_state(struct rotation_thread_handle *handle,
286 struct rotation_thread *state)
287 {
288 int ret;
289
290 memset(state, 0, sizeof(*state));
291 lttng_poll_init(&state->events);
292
293 ret = init_poll_set(&state->events, handle);
294 if (ret) {
295 ERR("Failed to initialize rotation thread poll set");
296 goto end;
297 }
298
299 rotate_notification_channel = lttng_notification_channel_create(
300 lttng_session_daemon_notification_endpoint);
301 if (!rotate_notification_channel) {
302 ERR("Could not create notification channel");
303 ret = -1;
304 goto end;
305 }
306 ret = lttng_poll_add(&state->events, rotate_notification_channel->socket,
307 LPOLLIN | LPOLLERR);
308 if (ret < 0) {
309 ERR("Failed to add notification fd to pollset");
310 goto end;
311 }
312
313 end:
314 return ret;
315 }
316
317 static
318 void check_session_rotation_pending_on_consumers(struct ltt_session *session,
319 bool *_rotation_completed)
320 {
321 int ret = 0;
322 struct consumer_socket *socket;
323 struct cds_lfht_iter iter;
324 enum consumer_trace_chunk_exists_status exists_status;
325 uint64_t relayd_id;
326 bool chunk_exists_on_peer = false;
327 enum lttng_trace_chunk_status chunk_status;
328
329 LTTNG_ASSERT(session->chunk_being_archived);
330
331 /*
332 * Check for a local pending rotation on all consumers (32-bit
333 * user space, 64-bit user space, and kernel).
334 */
335 rcu_read_lock();
336 if (!session->ust_session) {
337 goto skip_ust;
338 }
339 cds_lfht_for_each_entry(session->ust_session->consumer->socks->ht,
340 &iter, socket, node.node) {
341 relayd_id = session->ust_session->consumer->type == CONSUMER_DST_LOCAL ?
342 -1ULL :
343 session->ust_session->consumer->net_seq_index;
344
345 pthread_mutex_lock(socket->lock);
346 ret = consumer_trace_chunk_exists(socket,
347 relayd_id,
348 session->id, session->chunk_being_archived,
349 &exists_status);
350 if (ret) {
351 pthread_mutex_unlock(socket->lock);
352 ERR("Error occurred while checking rotation status on consumer daemon");
353 goto end;
354 }
355
356 if (exists_status != CONSUMER_TRACE_CHUNK_EXISTS_STATUS_UNKNOWN_CHUNK) {
357 pthread_mutex_unlock(socket->lock);
358 chunk_exists_on_peer = true;
359 goto end;
360 }
361 pthread_mutex_unlock(socket->lock);
362 }
363
364 skip_ust:
365 if (!session->kernel_session) {
366 goto skip_kernel;
367 }
368 cds_lfht_for_each_entry(session->kernel_session->consumer->socks->ht,
369 &iter, socket, node.node) {
370 pthread_mutex_lock(socket->lock);
371 relayd_id = session->kernel_session->consumer->type == CONSUMER_DST_LOCAL ?
372 -1ULL :
373 session->kernel_session->consumer->net_seq_index;
374
375 ret = consumer_trace_chunk_exists(socket,
376 relayd_id,
377 session->id, session->chunk_being_archived,
378 &exists_status);
379 if (ret) {
380 pthread_mutex_unlock(socket->lock);
381 ERR("Error occurred while checking rotation status on consumer daemon");
382 goto end;
383 }
384
385 if (exists_status != CONSUMER_TRACE_CHUNK_EXISTS_STATUS_UNKNOWN_CHUNK) {
386 pthread_mutex_unlock(socket->lock);
387 chunk_exists_on_peer = true;
388 goto end;
389 }
390 pthread_mutex_unlock(socket->lock);
391 }
392 skip_kernel:
393 end:
394 rcu_read_unlock();
395
396 if (!chunk_exists_on_peer) {
397 uint64_t chunk_being_archived_id;
398
399 chunk_status = lttng_trace_chunk_get_id(
400 session->chunk_being_archived,
401 &chunk_being_archived_id);
402 LTTNG_ASSERT(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK);
403 DBG("Rotation of trace archive %" PRIu64 " of session \"%s\" is complete on all consumers",
404 chunk_being_archived_id,
405 session->name);
406 }
407 *_rotation_completed = !chunk_exists_on_peer;
408 if (ret) {
409 ret = session_reset_rotation_state(session,
410 LTTNG_ROTATION_STATE_ERROR);
411 if (ret) {
412 ERR("Failed to reset rotation state of session \"%s\"",
413 session->name);
414 }
415 }
416 }
417
418 /*
419 * Check if the last rotation was completed, called with session lock held.
420 * Should only return non-zero in the event of a fatal error. Doing so will
421 * shutdown the thread.
422 */
423 static
424 int check_session_rotation_pending(struct ltt_session *session,
425 struct notification_thread_handle *notification_thread_handle)
426 {
427 int ret;
428 struct lttng_trace_archive_location *location;
429 enum lttng_trace_chunk_status chunk_status;
430 bool rotation_completed = false;
431 const char *archived_chunk_name;
432 uint64_t chunk_being_archived_id;
433
434 if (!session->chunk_being_archived) {
435 ret = 0;
436 goto end;
437 }
438
439 chunk_status = lttng_trace_chunk_get_id(session->chunk_being_archived,
440 &chunk_being_archived_id);
441 LTTNG_ASSERT(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK);
442
443 DBG("Checking for pending rotation on session \"%s\", trace archive %" PRIu64,
444 session->name, chunk_being_archived_id);
445
446 /*
447 * The rotation-pending check timer of a session is launched in
448 * one-shot mode. If the rotation is incomplete, the rotation
449 * thread will re-enable the pending-check timer.
450 *
451 * The timer thread can't stop the timer itself since it is involved
452 * in the check for the timer's quiescence.
453 */
454 ret = timer_session_rotation_pending_check_stop(session);
455 if (ret) {
456 goto check_ongoing_rotation;
457 }
458
459 check_session_rotation_pending_on_consumers(session,
460 &rotation_completed);
461 if (!rotation_completed ||
462 session->rotation_state == LTTNG_ROTATION_STATE_ERROR) {
463 goto check_ongoing_rotation;
464 }
465
466 /*
467 * Now we can clear the "ONGOING" state in the session. New
468 * rotations can start now.
469 */
470 chunk_status = lttng_trace_chunk_get_name(session->chunk_being_archived,
471 &archived_chunk_name, NULL);
472 LTTNG_ASSERT(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK);
473 free(session->last_archived_chunk_name);
474 session->last_archived_chunk_name = strdup(archived_chunk_name);
475 if (!session->last_archived_chunk_name) {
476 PERROR("Failed to duplicate archived chunk name");
477 }
478 session_reset_rotation_state(session, LTTNG_ROTATION_STATE_COMPLETED);
479
480 if (!session->quiet_rotation) {
481 location = session_get_trace_archive_location(session);
482 ret = notification_thread_command_session_rotation_completed(
483 notification_thread_handle,
484 session->name,
485 session->uid,
486 session->gid,
487 session->last_archived_chunk_id.value,
488 location);
489 lttng_trace_archive_location_put(location);
490 if (ret != LTTNG_OK) {
491 ERR("Failed to notify notification thread of completed rotation for session %s",
492 session->name);
493 }
494 }
495
496 ret = 0;
497 check_ongoing_rotation:
498 if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING) {
499 chunk_status = lttng_trace_chunk_get_id(
500 session->chunk_being_archived,
501 &chunk_being_archived_id);
502 LTTNG_ASSERT(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK);
503
504 DBG("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("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("Scheduled time-based rotation successfully launched on session \"%s\"",
533 session->name);
534 } else {
535 /* Don't consider errors as fatal. */
536 DBG("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("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("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("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("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 DBG("Failed to find session while handling notification: notification type = %s, session name = `%s`",
664 lttng_condition_type_str(condition_type),
665 condition_session_name);
666 /*
667 * Not a fatal error: a session can be destroyed before we get
668 * the chance to handle the notification.
669 */
670 ret = 0;
671 session_unlock_list();
672 goto end;
673 }
674 session_lock(session);
675
676 ret = unsubscribe_session_consumed_size_rotation(session,
677 notification_thread_handle);
678 if (ret) {
679 goto end_unlock;
680 }
681
682 ret = cmd_rotate_session(session, NULL, false,
683 LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED);
684 if (ret == -LTTNG_ERR_ROTATION_PENDING) {
685 DBG("Rotate already pending, subscribe to the next threshold value");
686 } else if (ret != LTTNG_OK) {
687 ERR("Failed to rotate on size notification with error: %s",
688 lttng_strerror(ret));
689 ret = -1;
690 goto end_unlock;
691 }
692 ret = subscribe_session_consumed_size_rotation(session,
693 consumed + session->rotate_size,
694 notification_thread_handle);
695 if (ret) {
696 ERR("Failed to subscribe to session consumed size condition");
697 goto end_unlock;
698 }
699 ret = 0;
700
701 end_unlock:
702 session_unlock(session);
703 session_put(session);
704 session_unlock_list();
705 end:
706 return ret;
707 }
708
709 static
710 int handle_notification_channel(int fd,
711 struct rotation_thread_handle *handle,
712 struct rotation_thread *state)
713 {
714 int ret;
715 bool notification_pending;
716 struct lttng_notification *notification = NULL;
717 enum lttng_notification_channel_status status;
718 const struct lttng_evaluation *notification_evaluation;
719 const struct lttng_condition *notification_condition;
720
721 status = lttng_notification_channel_has_pending_notification(
722 rotate_notification_channel, &notification_pending);
723 if (status != LTTNG_NOTIFICATION_CHANNEL_STATUS_OK) {
724 ERR("Error occurred while checking for pending notification");
725 ret = -1;
726 goto end;
727 }
728
729 if (!notification_pending) {
730 ret = 0;
731 goto end;
732 }
733
734 /* Receive the next notification. */
735 status = lttng_notification_channel_get_next_notification(
736 rotate_notification_channel,
737 &notification);
738
739 switch (status) {
740 case LTTNG_NOTIFICATION_CHANNEL_STATUS_OK:
741 break;
742 case LTTNG_NOTIFICATION_CHANNEL_STATUS_NOTIFICATIONS_DROPPED:
743 /* Not an error, we will wait for the next one */
744 ret = 0;
745 goto end;;
746 case LTTNG_NOTIFICATION_CHANNEL_STATUS_CLOSED:
747 ERR("Notification channel was closed");
748 ret = -1;
749 goto end;
750 default:
751 /* Unhandled conditions / errors. */
752 ERR("Unknown notification channel status");
753 ret = -1;
754 goto end;
755 }
756
757 notification_condition = lttng_notification_get_condition(notification);
758 notification_evaluation = lttng_notification_get_evaluation(notification);
759
760 ret = handle_condition(notification_condition, notification_evaluation,
761 handle->notification_thread_handle);
762
763 end:
764 lttng_notification_destroy(notification);
765 return ret;
766 }
767
768 static
769 void *thread_rotation(void *data)
770 {
771 int ret;
772 struct rotation_thread_handle *handle = (rotation_thread_handle *) data;
773 struct rotation_thread thread;
774 int queue_pipe_fd;
775
776 DBG("Started rotation thread");
777 rcu_register_thread();
778 rcu_thread_online();
779 health_register(the_health_sessiond, HEALTH_SESSIOND_TYPE_ROTATION);
780 health_code_update();
781
782 if (!handle) {
783 ERR("Invalid thread context provided");
784 goto end;
785 }
786
787 queue_pipe_fd = lttng_pipe_get_readfd(
788 handle->rotation_timer_queue->event_pipe);
789
790
791 ret = init_thread_state(handle, &thread);
792 if (ret) {
793 goto error;
794 }
795
796 while (true) {
797 int fd_count, i;
798
799 health_poll_entry();
800 DBG("Entering poll wait");
801 ret = lttng_poll_wait(&thread.events, -1);
802 DBG("Poll wait returned (%i)", ret);
803 health_poll_exit();
804 if (ret < 0) {
805 /*
806 * Restart interrupted system call.
807 */
808 if (errno == EINTR) {
809 continue;
810 }
811 ERR("Error encountered during lttng_poll_wait (%i)", ret);
812 goto error;
813 }
814
815 fd_count = ret;
816 for (i = 0; i < fd_count; i++) {
817 int fd = LTTNG_POLL_GETFD(&thread.events, i);
818 uint32_t revents = LTTNG_POLL_GETEV(&thread.events, i);
819
820 DBG("Handling fd (%i) activity (%u)",
821 fd, revents);
822
823 if (revents & LPOLLERR) {
824 ERR("Polling returned an error on fd %i", fd);
825 goto error;
826 }
827
828 if (fd == rotate_notification_channel->socket) {
829 ret = handle_notification_channel(fd, handle,
830 &thread);
831 if (ret) {
832 ERR("Error occurred while handling activity on notification channel socket");
833 goto error;
834 }
835 } else {
836 /* Job queue or quit pipe activity. */
837
838 /*
839 * The job queue is serviced if there is
840 * activity on the quit pipe to ensure it is
841 * flushed and all references held in the queue
842 * are released.
843 */
844 ret = handle_job_queue(handle, &thread,
845 handle->rotation_timer_queue);
846 if (ret) {
847 ERR("Failed to handle rotation timer pipe event");
848 goto error;
849 }
850
851 if (fd == queue_pipe_fd) {
852 char buf;
853
854 ret = lttng_read(fd, &buf, 1);
855 if (ret != 1) {
856 ERR("Failed to read from wakeup pipe (fd = %i)", fd);
857 goto error;
858 }
859 } else {
860 DBG("Quit pipe activity");
861 goto exit;
862 }
863 }
864 }
865 }
866 exit:
867 error:
868 DBG("Thread exit");
869 fini_thread_state(&thread);
870 end:
871 health_unregister(the_health_sessiond);
872 rcu_thread_offline();
873 rcu_unregister_thread();
874 return NULL;
875 }
876
877 static
878 bool shutdown_rotation_thread(void *thread_data)
879 {
880 struct rotation_thread_handle *handle = (rotation_thread_handle *) thread_data;
881 const int write_fd = lttng_pipe_get_writefd(handle->quit_pipe);
882
883 return notify_thread_pipe(write_fd) == 1;
884 }
885
886 bool launch_rotation_thread(struct rotation_thread_handle *handle)
887 {
888 struct lttng_thread *thread;
889
890 thread = lttng_thread_create("Rotation",
891 thread_rotation,
892 shutdown_rotation_thread,
893 NULL,
894 handle);
895 if (!thread) {
896 goto error;
897 }
898 lttng_thread_put(thread);
899 return true;
900 error:
901 return false;
902 }
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