6c828c8f05221536e6a887337591a34e30dfe7ae
[lttng-tools.git] / src / bin / lttng-sessiond / action-executor.c
1 /*
2 * Copyright (C) 2020 Jérémie Galarneau <jeremie.galarneau@efficios.com>
3 *
4 * SPDX-License-Identifier: GPL-2.0-only
5 *
6 */
7
8 #include "action-executor.h"
9 #include "cmd.h"
10 #include "health-sessiond.h"
11 #include "lttng-sessiond.h"
12 #include "notification-thread-internal.h"
13 #include "session.h"
14 #include "thread.h"
15 #include <common/macros.h>
16 #include <common/optional.h>
17 #include <lttng/action/action-internal.h>
18 #include <lttng/action/group-internal.h>
19 #include <lttng/action/group.h>
20 #include <lttng/action/notify-internal.h>
21 #include <lttng/action/notify.h>
22 #include <lttng/action/rotate-session.h>
23 #include <lttng/action/snapshot-session.h>
24 #include <lttng/action/start-session.h>
25 #include <lttng/action/stop-session.h>
26 #include <lttng/condition/evaluation.h>
27 #include <lttng/condition/on-event-internal.h>
28 #include <lttng/lttng-error.h>
29 #include <lttng/trigger/trigger-internal.h>
30 #include <pthread.h>
31 #include <stdbool.h>
32 #include <stddef.h>
33 #include <urcu/list.h>
34
35 #define THREAD_NAME "Action Executor"
36 #define MAX_QUEUED_WORK_COUNT 8192
37
38 struct action_work_item {
39 uint64_t id;
40 struct lttng_trigger *trigger;
41 struct lttng_evaluation *evaluation;
42 struct notification_client_list *client_list;
43 LTTNG_OPTIONAL(struct lttng_credentials) object_creds;
44 struct cds_list_head list_node;
45 };
46
47 struct action_executor {
48 struct lttng_thread *thread;
49 struct notification_thread_handle *notification_thread_handle;
50 struct {
51 uint64_t pending_count;
52 struct cds_list_head list;
53 pthread_cond_t cond;
54 pthread_mutex_t lock;
55 } work;
56 bool should_quit;
57 uint64_t next_work_item_id;
58 };
59
60 /*
61 * Only return non-zero on a fatal error that should shut down the action
62 * executor.
63 */
64 typedef int (*action_executor_handler)(struct action_executor *executor,
65 const struct action_work_item *,
66 struct lttng_action *action);
67
68 static int action_executor_notify_handler(struct action_executor *executor,
69 const struct action_work_item *,
70 struct lttng_action *);
71 static int action_executor_start_session_handler(
72 struct action_executor *executor,
73 const struct action_work_item *,
74 struct lttng_action *);
75 static int action_executor_stop_session_handler(
76 struct action_executor *executor,
77 const struct action_work_item *,
78 struct lttng_action *);
79 static int action_executor_rotate_session_handler(
80 struct action_executor *executor,
81 const struct action_work_item *,
82 struct lttng_action *);
83 static int action_executor_snapshot_session_handler(
84 struct action_executor *executor,
85 const struct action_work_item *,
86 struct lttng_action *);
87 static int action_executor_group_handler(struct action_executor *executor,
88 const struct action_work_item *,
89 struct lttng_action *);
90 static int action_executor_generic_handler(struct action_executor *executor,
91 const struct action_work_item *,
92 struct lttng_action *);
93
94 static const action_executor_handler action_executors[] = {
95 [LTTNG_ACTION_TYPE_NOTIFY] = action_executor_notify_handler,
96 [LTTNG_ACTION_TYPE_START_SESSION] = action_executor_start_session_handler,
97 [LTTNG_ACTION_TYPE_STOP_SESSION] = action_executor_stop_session_handler,
98 [LTTNG_ACTION_TYPE_ROTATE_SESSION] = action_executor_rotate_session_handler,
99 [LTTNG_ACTION_TYPE_SNAPSHOT_SESSION] = action_executor_snapshot_session_handler,
100 [LTTNG_ACTION_TYPE_GROUP] = action_executor_group_handler,
101 };
102
103 static const char *get_action_name(const struct lttng_action *action)
104 {
105 const enum lttng_action_type action_type = lttng_action_get_type(action);
106
107 assert(action_type != LTTNG_ACTION_TYPE_UNKNOWN);
108
109 return lttng_action_type_string(action_type);
110 }
111
112 /* Check if this trigger allowed to interect with a given session. */
113 static bool is_trigger_allowed_for_session(const struct lttng_trigger *trigger,
114 struct ltt_session *session)
115 {
116 bool is_allowed = false;
117 const struct lttng_credentials session_creds = {
118 .uid = LTTNG_OPTIONAL_INIT_VALUE(session->uid),
119 .gid = LTTNG_OPTIONAL_INIT_VALUE(session->gid),
120 };
121 /* Can never be NULL. */
122 const struct lttng_credentials *trigger_creds =
123 lttng_trigger_get_credentials(trigger);
124
125 is_allowed = (lttng_credentials_is_equal_uid(trigger_creds, &session_creds)) ||
126 (lttng_credentials_get_uid(trigger_creds) == 0);
127 if (!is_allowed) {
128 WARN("Trigger is not allowed to interact with session `%s`: session uid = %ld, session gid = %ld, trigger uid = %ld",
129 session->name,
130 (long int) session->uid,
131 (long int) session->gid,
132 (long int) lttng_credentials_get_uid(trigger_creds));
133 }
134
135 return is_allowed;
136 }
137
138 static const char *get_trigger_name(const struct lttng_trigger *trigger)
139 {
140 const char *trigger_name;
141 enum lttng_trigger_status trigger_status;
142
143 trigger_status = lttng_trigger_get_name(trigger, &trigger_name);
144 assert(trigger_status == LTTNG_TRIGGER_STATUS_OK);
145
146 return trigger_name;
147 }
148
149 static int client_handle_transmission_status(
150 struct notification_client *client,
151 enum client_transmission_status status,
152 void *user_data)
153 {
154 int ret = 0;
155 struct action_executor *executor = user_data;
156 bool update_communication = true;
157
158 switch (status) {
159 case CLIENT_TRANSMISSION_STATUS_COMPLETE:
160 DBG("Successfully sent full notification to client, client_id = %" PRIu64,
161 client->id);
162 update_communication = false;
163 break;
164 case CLIENT_TRANSMISSION_STATUS_QUEUED:
165 DBG("Queued notification in client outgoing buffer, client_id = %" PRIu64,
166 client->id);
167 break;
168 case CLIENT_TRANSMISSION_STATUS_FAIL:
169 DBG("Communication error occurred while sending notification to client, client_id = %" PRIu64,
170 client->id);
171 break;
172 default:
173 ERR("Fatal error encoutered while sending notification to client, client_id = %" PRIu64,
174 client->id);
175 ret = -1;
176 goto end;
177 }
178
179 if (!update_communication) {
180 goto end;
181 }
182
183 /* Safe to read client's id without locking as it is immutable. */
184 ret = notification_thread_client_communication_update(
185 executor->notification_thread_handle, client->id,
186 status);
187 end:
188 return ret;
189 }
190
191 static int action_executor_notify_handler(struct action_executor *executor,
192 const struct action_work_item *work_item,
193 struct lttng_action *action)
194 {
195 return notification_client_list_send_evaluation(work_item->client_list,
196 work_item->trigger,
197 work_item->evaluation,
198 work_item->object_creds.is_set ?
199 &(work_item->object_creds.value) :
200 NULL,
201 client_handle_transmission_status, executor);
202 }
203
204 static int action_executor_start_session_handler(
205 struct action_executor *executor,
206 const struct action_work_item *work_item,
207 struct lttng_action *action)
208 {
209 int ret = 0;
210 const char *session_name;
211 enum lttng_action_status action_status;
212 struct ltt_session *session;
213 enum lttng_error_code cmd_ret;
214
215 action_status = lttng_action_start_session_get_session_name(
216 action, &session_name);
217 if (action_status != LTTNG_ACTION_STATUS_OK) {
218 ERR("Failed to get session name from `%s` action",
219 get_action_name(action));
220 ret = -1;
221 goto end;
222 }
223
224 session_lock_list();
225 session = session_find_by_name(session_name);
226 if (!session) {
227 DBG("Failed to find session `%s` by name while executing `%s` action of trigger `%s`",
228 session_name, get_action_name(action),
229 get_trigger_name(work_item->trigger));
230 goto error_unlock_list;
231 }
232
233 session_lock(session);
234 if (!is_trigger_allowed_for_session(work_item->trigger, session)) {
235 goto error_dispose_session;
236 }
237
238 cmd_ret = cmd_start_trace(session);
239 switch (cmd_ret) {
240 case LTTNG_OK:
241 DBG("Successfully started session `%s` on behalf of trigger `%s`",
242 session_name, get_trigger_name(work_item->trigger));
243 break;
244 case LTTNG_ERR_TRACE_ALREADY_STARTED:
245 DBG("Attempted to start session `%s` on behalf of trigger `%s` but it was already started",
246 session_name, get_trigger_name(work_item->trigger));
247 break;
248 default:
249 WARN("Failed to start session `%s` on behalf of trigger `%s`: %s",
250 session_name, get_trigger_name(work_item->trigger),
251 lttng_strerror(-cmd_ret));
252 lttng_action_increase_execution_failure_count(action);
253 break;
254 }
255
256 error_dispose_session:
257 session_unlock(session);
258 session_put(session);
259 error_unlock_list:
260 session_unlock_list();
261 end:
262 return ret;
263 }
264
265 static int action_executor_stop_session_handler(
266 struct action_executor *executor,
267 const struct action_work_item *work_item,
268 struct lttng_action *action)
269 {
270 int ret = 0;
271 const char *session_name;
272 enum lttng_action_status action_status;
273 struct ltt_session *session;
274 enum lttng_error_code cmd_ret;
275
276 action_status = lttng_action_stop_session_get_session_name(
277 action, &session_name);
278 if (action_status != LTTNG_ACTION_STATUS_OK) {
279 ERR("Failed to get session name from `%s` action",
280 get_action_name(action));
281 ret = -1;
282 goto end;
283 }
284
285 session_lock_list();
286 session = session_find_by_name(session_name);
287 if (!session) {
288 DBG("Failed to find session `%s` by name while executing `%s` action of trigger `%s`",
289 session_name, get_action_name(action),
290 get_trigger_name(work_item->trigger));
291 lttng_action_increase_execution_failure_count(action);
292 goto error_unlock_list;
293 }
294
295 session_lock(session);
296 if (!is_trigger_allowed_for_session(work_item->trigger, session)) {
297 goto error_dispose_session;
298 }
299
300 cmd_ret = cmd_stop_trace(session);
301 switch (cmd_ret) {
302 case LTTNG_OK:
303 DBG("Successfully stopped session `%s` on behalf of trigger `%s`",
304 session_name, get_trigger_name(work_item->trigger));
305 break;
306 case LTTNG_ERR_TRACE_ALREADY_STOPPED:
307 DBG("Attempted to stop session `%s` on behalf of trigger `%s` but it was already stopped",
308 session_name, get_trigger_name(work_item->trigger));
309 break;
310 default:
311 WARN("Failed to stop session `%s` on behalf of trigger `%s`: %s",
312 session_name, get_trigger_name(work_item->trigger),
313 lttng_strerror(-cmd_ret));
314 lttng_action_increase_execution_failure_count(action);
315 break;
316 }
317
318 error_dispose_session:
319 session_unlock(session);
320 session_put(session);
321 error_unlock_list:
322 session_unlock_list();
323 end:
324 return ret;
325 }
326
327 static int action_executor_rotate_session_handler(
328 struct action_executor *executor,
329 const struct action_work_item *work_item,
330 struct lttng_action *action)
331 {
332 int ret = 0;
333 const char *session_name;
334 enum lttng_action_status action_status;
335 struct ltt_session *session;
336 enum lttng_error_code cmd_ret;
337
338 action_status = lttng_action_rotate_session_get_session_name(
339 action, &session_name);
340 if (action_status != LTTNG_ACTION_STATUS_OK) {
341 ERR("Failed to get session name from `%s` action",
342 get_action_name(action));
343 ret = -1;
344 goto end;
345 }
346
347 session_lock_list();
348 session = session_find_by_name(session_name);
349 if (!session) {
350 DBG("Failed to find session `%s` by name while executing `%s` action of trigger `%s`",
351 session_name, get_action_name(action),
352 get_trigger_name(work_item->trigger));
353 lttng_action_increase_execution_failure_count(action);
354 goto error_unlock_list;
355 }
356
357 session_lock(session);
358 if (!is_trigger_allowed_for_session(work_item->trigger, session)) {
359 goto error_dispose_session;
360 }
361
362 cmd_ret = cmd_rotate_session(session, NULL, false,
363 LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED);
364 switch (cmd_ret) {
365 case LTTNG_OK:
366 DBG("Successfully started rotation of session `%s` on behalf of trigger `%s`",
367 session_name, get_trigger_name(work_item->trigger));
368 break;
369 case LTTNG_ERR_ROTATION_PENDING:
370 DBG("Attempted to start a rotation of session `%s` on behalf of trigger `%s` but a rotation is already ongoing",
371 session_name, get_trigger_name(work_item->trigger));
372 lttng_action_increase_execution_failure_count(action);
373 break;
374 case LTTNG_ERR_ROTATION_MULTIPLE_AFTER_STOP:
375 case LTTNG_ERR_ROTATION_AFTER_STOP_CLEAR:
376 DBG("Attempted to start a rotation of session `%s` on behalf of trigger `%s` but a rotation has already been completed since the last stop or clear",
377 session_name, get_trigger_name(work_item->trigger));
378 break;
379 default:
380 WARN("Failed to start a rotation of session `%s` on behalf of trigger `%s`: %s",
381 session_name, get_trigger_name(work_item->trigger),
382 lttng_strerror(-cmd_ret));
383 lttng_action_increase_execution_failure_count(action);
384 break;
385 }
386
387 error_dispose_session:
388 session_unlock(session);
389 session_put(session);
390 error_unlock_list:
391 session_unlock_list();
392 end:
393 return ret;
394 }
395
396 static int action_executor_snapshot_session_handler(
397 struct action_executor *executor,
398 const struct action_work_item *work_item,
399 struct lttng_action *action)
400 {
401 int ret = 0;
402 const char *session_name;
403 enum lttng_action_status action_status;
404 struct ltt_session *session;
405 const struct lttng_snapshot_output default_snapshot_output = {
406 .max_size = UINT64_MAX,
407 };
408 const struct lttng_snapshot_output *snapshot_output =
409 &default_snapshot_output;
410 enum lttng_error_code cmd_ret;
411
412 action_status = lttng_action_snapshot_session_get_session_name(
413 action, &session_name);
414 if (action_status != LTTNG_ACTION_STATUS_OK) {
415 ERR("Failed to get session name from `%s` action",
416 get_action_name(action));
417 ret = -1;
418 goto end;
419 }
420
421 action_status = lttng_action_snapshot_session_get_output(
422 action, &snapshot_output);
423 if (action_status != LTTNG_ACTION_STATUS_OK &&
424 action_status != LTTNG_ACTION_STATUS_UNSET) {
425 ERR("Failed to get output from `%s` action",
426 get_action_name(action));
427 ret = -1;
428 goto end;
429 }
430
431 session_lock_list();
432 session = session_find_by_name(session_name);
433 if (!session) {
434 DBG("Failed to find session `%s` by name while executing `%s` action of trigger `%s`",
435 session_name, get_action_name(action),
436 get_trigger_name(work_item->trigger));
437 lttng_action_increase_execution_failure_count(action);
438 goto error_unlock_list;
439 }
440
441
442 session_lock(session);
443 if (!is_trigger_allowed_for_session(work_item->trigger, session)) {
444 goto error_dispose_session;
445 }
446
447 cmd_ret = cmd_snapshot_record(session, snapshot_output, 0);
448 switch (cmd_ret) {
449 case LTTNG_OK:
450 DBG("Successfully recorded snapshot of session `%s` on behalf of trigger `%s`",
451 session_name, get_trigger_name(work_item->trigger));
452 break;
453 default:
454 WARN("Failed to record snapshot of session `%s` on behalf of trigger `%s`: %s",
455 session_name, get_trigger_name(work_item->trigger),
456 lttng_strerror(-cmd_ret));
457 lttng_action_increase_execution_failure_count(action);
458 break;
459 }
460
461 error_dispose_session:
462 session_unlock(session);
463 session_put(session);
464 error_unlock_list:
465 session_unlock_list();
466 end:
467 return ret;
468 }
469
470 static int action_executor_group_handler(struct action_executor *executor,
471 const struct action_work_item *work_item,
472 struct lttng_action *action_group)
473 {
474 int ret = 0;
475 unsigned int i, count;
476 enum lttng_action_status action_status;
477
478 action_status = lttng_action_group_get_count(action_group, &count);
479 if (action_status != LTTNG_ACTION_STATUS_OK) {
480 /* Fatal error. */
481 ERR("Failed to get count of action in action group");
482 ret = -1;
483 goto end;
484 }
485
486 DBG("Action group has %u action%s", count, count != 1 ? "s" : "");
487 for (i = 0; i < count; i++) {
488 struct lttng_action *action =
489 lttng_action_group_borrow_mutable_at_index(
490 action_group, i);
491
492 ret = action_executor_generic_handler(
493 executor, work_item, action);
494 if (ret) {
495 ERR("Stopping the execution of the action group of trigger `%s` following a fatal error",
496 get_trigger_name(work_item->trigger));
497 goto end;
498 }
499 }
500 end:
501 return ret;
502 }
503
504 static int action_executor_generic_handler(struct action_executor *executor,
505 const struct action_work_item *work_item,
506 struct lttng_action *action)
507 {
508 int ret;
509 const enum lttng_action_type action_type = lttng_action_get_type(action);
510
511 assert(action_type != LTTNG_ACTION_TYPE_UNKNOWN);
512
513 lttng_action_increase_execution_request_count(action);
514 if (!lttng_action_should_execute(action)) {
515 DBG("Policy prevented execution of action `%s` of trigger `%s` action work item %" PRIu64,
516 get_action_name(action),
517 get_trigger_name(work_item->trigger),
518 work_item->id);
519 ret = 0;
520 goto end;
521 }
522
523 lttng_action_increase_execution_count(action);
524 DBG("Executing action `%s` of trigger `%s` action work item %" PRIu64,
525 get_action_name(action),
526 get_trigger_name(work_item->trigger),
527 work_item->id);
528 ret = action_executors[action_type](executor, work_item, action);
529 end:
530 return ret;
531 }
532
533 static int action_work_item_execute(struct action_executor *executor,
534 struct action_work_item *work_item)
535 {
536 int ret;
537 struct lttng_action *action =
538 lttng_trigger_get_action(work_item->trigger);
539
540 DBG("Starting execution of action work item %" PRIu64 " of trigger `%s`",
541 work_item->id, get_trigger_name(work_item->trigger));
542 ret = action_executor_generic_handler(executor, work_item, action);
543 DBG("Completed execution of action work item %" PRIu64 " of trigger `%s`",
544 work_item->id, get_trigger_name(work_item->trigger));
545 return ret;
546 }
547
548 static void action_work_item_destroy(struct action_work_item *work_item)
549 {
550 lttng_trigger_put(work_item->trigger);
551 lttng_evaluation_destroy(work_item->evaluation);
552 notification_client_list_put(work_item->client_list);
553 free(work_item);
554 }
555
556 static void *action_executor_thread(void *_data)
557 {
558 struct action_executor *executor = _data;
559
560 assert(executor);
561
562 health_register(the_health_sessiond,
563 HEALTH_SESSIOND_TYPE_ACTION_EXECUTOR);
564
565 rcu_register_thread();
566 rcu_thread_online();
567
568 DBG("Entering work execution loop");
569 pthread_mutex_lock(&executor->work.lock);
570 while (!executor->should_quit) {
571 int ret;
572 struct action_work_item *work_item;
573
574 health_code_update();
575 if (executor->work.pending_count == 0) {
576 health_poll_entry();
577 DBG("No work items enqueued, entering wait");
578 pthread_cond_wait(&executor->work.cond,
579 &executor->work.lock);
580 DBG("Woke-up from wait");
581 health_poll_exit();
582 continue;
583 }
584
585 /* Pop item from front of the list with work lock held. */
586 work_item = cds_list_first_entry(&executor->work.list,
587 struct action_work_item, list_node);
588 cds_list_del(&work_item->list_node);
589 executor->work.pending_count--;
590
591 /*
592 * Work can be performed without holding the work lock,
593 * allowing new items to be queued.
594 */
595 pthread_mutex_unlock(&executor->work.lock);
596 ret = action_work_item_execute(executor, work_item);
597 action_work_item_destroy(work_item);
598 if (ret) {
599 /* Fatal error. */
600 break;
601 }
602
603 health_code_update();
604 pthread_mutex_lock(&executor->work.lock);
605 }
606
607 if (executor->should_quit) {
608 pthread_mutex_unlock(&executor->work.lock);
609 }
610 DBG("Left work execution loop");
611
612 health_code_update();
613
614 rcu_thread_offline();
615 rcu_unregister_thread();
616 health_unregister(the_health_sessiond);
617
618 return NULL;
619 }
620
621 static bool shutdown_action_executor_thread(void *_data)
622 {
623 struct action_executor *executor = _data;
624
625 pthread_mutex_lock(&executor->work.lock);
626 executor->should_quit = true;
627 pthread_cond_signal(&executor->work.cond);
628 pthread_mutex_unlock(&executor->work.lock);
629 return true;
630 }
631
632 static void clean_up_action_executor_thread(void *_data)
633 {
634 struct action_executor *executor = _data;
635
636 assert(cds_list_empty(&executor->work.list));
637
638 pthread_mutex_destroy(&executor->work.lock);
639 pthread_cond_destroy(&executor->work.cond);
640 free(executor);
641 }
642
643 struct action_executor *action_executor_create(
644 struct notification_thread_handle *handle)
645 {
646 struct action_executor *executor = zmalloc(sizeof(*executor));
647
648 if (!executor) {
649 goto end;
650 }
651
652 CDS_INIT_LIST_HEAD(&executor->work.list);
653 pthread_cond_init(&executor->work.cond, NULL);
654 pthread_mutex_init(&executor->work.lock, NULL);
655 executor->notification_thread_handle = handle;
656
657 executor->thread = lttng_thread_create(THREAD_NAME,
658 action_executor_thread, shutdown_action_executor_thread,
659 clean_up_action_executor_thread, executor);
660 end:
661 return executor;
662 }
663
664 void action_executor_destroy(struct action_executor *executor)
665 {
666 struct action_work_item *work_item, *tmp;
667
668 /* TODO Wait for work list to drain? */
669 lttng_thread_shutdown(executor->thread);
670 pthread_mutex_lock(&executor->work.lock);
671 if (executor->work.pending_count != 0) {
672 WARN("%" PRIu64
673 " trigger action%s still queued for execution and will be discarded",
674 executor->work.pending_count,
675 executor->work.pending_count == 1 ? " is" :
676 "s are");
677 }
678
679 cds_list_for_each_entry_safe (
680 work_item, tmp, &executor->work.list, list_node) {
681 WARN("Discarding action work item %" PRIu64
682 " associated to trigger `%s`",
683 work_item->id, get_trigger_name(work_item->trigger));
684 cds_list_del(&work_item->list_node);
685 action_work_item_destroy(work_item);
686 }
687 pthread_mutex_unlock(&executor->work.lock);
688 lttng_thread_put(executor->thread);
689 }
690
691 /* RCU read-lock must be held by the caller. */
692 enum action_executor_status action_executor_enqueue(
693 struct action_executor *executor,
694 struct lttng_trigger *trigger,
695 struct lttng_evaluation *evaluation,
696 const struct lttng_credentials *object_creds,
697 struct notification_client_list *client_list)
698 {
699 enum action_executor_status executor_status = ACTION_EXECUTOR_STATUS_OK;
700 const uint64_t work_item_id = executor->next_work_item_id++;
701 struct action_work_item *work_item;
702 bool signal = false;
703
704 pthread_mutex_lock(&executor->work.lock);
705 /* Check for queue overflow. */
706 if (executor->work.pending_count >= MAX_QUEUED_WORK_COUNT) {
707 /* Most likely spammy, remove if it is the case. */
708 DBG("Refusing to enqueue action for trigger `%s` as work item %" PRIu64
709 " (overflow)", get_trigger_name(trigger), work_item_id);
710 executor_status = ACTION_EXECUTOR_STATUS_OVERFLOW;
711 goto error_unlock;
712 }
713
714 work_item = zmalloc(sizeof(*work_item));
715 if (!work_item) {
716 PERROR("Failed to allocate action executor work item on behalf of trigger `%s`",
717 get_trigger_name(trigger));
718 executor_status = ACTION_EXECUTOR_STATUS_ERROR;
719 goto error_unlock;
720 }
721
722 lttng_trigger_get(trigger);
723 if (client_list) {
724 const bool reference_acquired =
725 notification_client_list_get(client_list);
726
727 assert(reference_acquired);
728 }
729
730 *work_item = (typeof(*work_item)){
731 .id = work_item_id,
732 .trigger = trigger,
733 /* Ownership transferred to the work item. */
734 .evaluation = evaluation,
735 .object_creds = {
736 .is_set = !!object_creds,
737 .value = object_creds ? *object_creds :
738 (typeof(work_item->object_creds.value)) {},
739 },
740 .client_list = client_list,
741 .list_node = CDS_LIST_HEAD_INIT(work_item->list_node),
742 };
743
744 evaluation = NULL;
745 cds_list_add_tail(&work_item->list_node, &executor->work.list);
746 executor->work.pending_count++;
747 DBG("Enqueued action for trigger `%s` as work item #%" PRIu64,
748 get_trigger_name(trigger), work_item_id);
749 signal = true;
750
751 error_unlock:
752 if (signal) {
753 pthread_cond_signal(&executor->work.cond);
754 }
755 pthread_mutex_unlock(&executor->work.lock);
756
757 lttng_evaluation_destroy(evaluation);
758 return executor_status;
759 }
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