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Clean-up: sessiond: prepend `the_` to global variable names
[lttng-tools.git] / src / bin / lttng-sessiond / action-executor.c
CommitLineData
f2b3ef9f
JG		 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.h>
2af3b9c9 19#include <lttng/action/notify-internal.h>
f2b3ef9f
JG		 20#include <lttng/action/notify.h>
21#include <lttng/action/rotate-session.h>
22#include <lttng/action/snapshot-session.h>
23#include <lttng/action/start-session.h>
24#include <lttng/action/stop-session.h>
25#include <lttng/condition/evaluation.h>
e393070a 26#include <lttng/condition/on-event-internal.h>
f2b3ef9f
JG		 27#include <lttng/lttng-error.h>
28#include <lttng/trigger/trigger-internal.h>
29#include <pthread.h>
30#include <stdbool.h>
31#include <stddef.h>
32#include <urcu/list.h>
33
34#define THREAD_NAME "Action Executor"
35#define MAX_QUEUED_WORK_COUNT 8192
36
37struct action_work_item {
38 uint64_t id;
39 struct lttng_trigger *trigger;
40 struct lttng_evaluation *evaluation;
41 struct notification_client_list *client_list;
42 LTTNG_OPTIONAL(struct lttng_credentials) object_creds;
43 struct cds_list_head list_node;
44};
45
46struct action_executor {
47 struct lttng_thread *thread;
48 struct notification_thread_handle *notification_thread_handle;
49 struct {
50 uint64_t pending_count;
51 struct cds_list_head list;
52 pthread_cond_t cond;
53 pthread_mutex_t lock;
54 } work;
55 bool should_quit;
56 uint64_t next_work_item_id;
57};
58
59/*
60 * Only return non-zero on a fatal error that should shut down the action
61 * executor.
62 */
63typedef int (*action_executor_handler)(struct action_executor *executor,
64 const struct action_work_item *,
65 const struct lttng_action *action);
66
67static int action_executor_notify_handler(struct action_executor *executor,
68 const struct action_work_item *,
69 const struct lttng_action *);
70static int action_executor_start_session_handler(struct action_executor *executor,
71 const struct action_work_item *,
72 const struct lttng_action *);
73static int action_executor_stop_session_handler(struct action_executor *executor,
74 const struct action_work_item *,
75 const struct lttng_action *);
76static int action_executor_rotate_session_handler(struct action_executor *executor,
77 const struct action_work_item *,
78 const struct lttng_action *);
79static int action_executor_snapshot_session_handler(struct action_executor *executor,
80 const struct action_work_item *,
81 const struct lttng_action *);
82static int action_executor_group_handler(struct action_executor *executor,
83 const struct action_work_item *,
84 const struct lttng_action *);
85static int action_executor_generic_handler(struct action_executor *executor,
86 const struct action_work_item *,
87 const struct lttng_action *);
88
89static const action_executor_handler action_executors[] = {
90 [LTTNG_ACTION_TYPE_NOTIFY] = action_executor_notify_handler,
91 [LTTNG_ACTION_TYPE_START_SESSION] = action_executor_start_session_handler,
92 [LTTNG_ACTION_TYPE_STOP_SESSION] = action_executor_stop_session_handler,
93 [LTTNG_ACTION_TYPE_ROTATE_SESSION] = action_executor_rotate_session_handler,
94 [LTTNG_ACTION_TYPE_SNAPSHOT_SESSION] = action_executor_snapshot_session_handler,
95 [LTTNG_ACTION_TYPE_GROUP] = action_executor_group_handler,
96};
97
98static const char *action_type_names[] = {
99 [LTTNG_ACTION_TYPE_NOTIFY] = "Notify",
100 [LTTNG_ACTION_TYPE_START_SESSION] = "Start session",
101 [LTTNG_ACTION_TYPE_STOP_SESSION] = "Stop session",
102 [LTTNG_ACTION_TYPE_ROTATE_SESSION] = "Rotate session",
103 [LTTNG_ACTION_TYPE_SNAPSHOT_SESSION] = "Snapshot session",
104 [LTTNG_ACTION_TYPE_GROUP] = "Group",
105};
106
107static const char *get_action_name(const struct lttng_action *action)
108{
0e43bcbf
JG		 109 const enum lttng_action_type action_type = lttng_action_get_type(action);
110
111 assert(action_type != LTTNG_ACTION_TYPE_UNKNOWN);
112
113 return action_type_names[action_type];
f2b3ef9f
JG		 114}
115
116/* Check if this trigger allowed to interect with a given session. */
117static bool is_trigger_allowed_for_session(const struct lttng_trigger *trigger,
118 struct ltt_session *session)
119{
120 bool is_allowed = false;
121 const struct lttng_credentials session_creds = {
ff588497
JR		 122 .uid = LTTNG_OPTIONAL_INIT_VALUE(session->uid),
123 .gid = LTTNG_OPTIONAL_INIT_VALUE(session->gid),
f2b3ef9f
JG		 124 };
125 /* Can never be NULL. */
126 const struct lttng_credentials *trigger_creds =
127 lttng_trigger_get_credentials(trigger);
128
ff588497
JR		 129 is_allowed = (lttng_credentials_is_equal_uid(trigger_creds, &session_creds)) ||
130 (lttng_credentials_get_uid(trigger_creds) == 0);
f2b3ef9f 131 if (!is_allowed) {
ff588497 132 WARN("Trigger is not allowed to interact with session `%s`: session uid = %ld, session gid = %ld, trigger uid = %ld",
f2b3ef9f
JG		 133 session->name,
134 (long int) session->uid,
135 (long int) session->gid,
ff588497 136 (long int) lttng_credentials_get_uid(trigger_creds));
f2b3ef9f
JG		 137 }
138
139 return is_allowed;
140}
141
34f87583
JR		 142static const char *get_trigger_name(const struct lttng_trigger *trigger)
143{
144 const char *trigger_name;
145 enum lttng_trigger_status trigger_status;
146
147 trigger_status = lttng_trigger_get_name(trigger, &trigger_name);
148 assert(trigger_status == LTTNG_TRIGGER_STATUS_OK);
149
150 return trigger_name;
151}
152
f2b3ef9f
JG		 153static int client_handle_transmission_status(
154 struct notification_client *client,
155 enum client_transmission_status status,
156 void *user_data)
157{
158 int ret = 0;
159 struct action_executor *executor = user_data;
160 bool update_communication = true;
161
f2b3ef9f
JG		 162 switch (status) {
163 case CLIENT_TRANSMISSION_STATUS_COMPLETE:
164 DBG("Successfully sent full notification to client, client_id = %" PRIu64,
165 client->id);
166 update_communication = false;
167 break;
168 case CLIENT_TRANSMISSION_STATUS_QUEUED:
169 DBG("Queued notification in client outgoing buffer, client_id = %" PRIu64,
170 client->id);
171 break;
172 case CLIENT_TRANSMISSION_STATUS_FAIL:
173 DBG("Communication error occurred while sending notification to client, client_id = %" PRIu64,
174 client->id);
f2b3ef9f
JG		 175 break;
176 default:
177 ERR("Fatal error encoutered while sending notification to client, client_id = %" PRIu64,
178 client->id);
f2b3ef9f
JG		 179 ret = -1;
180 goto end;
181 }
182
183 if (!update_communication) {
184 goto end;
185 }
186
6c24d3fd 187 /* Safe to read client's id without locking as it is immutable. */
f2b3ef9f
JG		 188 ret = notification_thread_client_communication_update(
189 executor->notification_thread_handle, client->id,
190 status);
191end:
192 return ret;
193}
194
195static int action_executor_notify_handler(struct action_executor *executor,
196 const struct action_work_item *work_item,
197 const struct lttng_action *action)
198{
199 return notification_client_list_send_evaluation(work_item->client_list,
52d55cf9 200 work_item->trigger,
f2b3ef9f 201 work_item->evaluation,
c203f058
JR		 202 work_item->object_creds.is_set ?
203 &(work_item->object_creds.value) :
204 NULL,
64eafdf6 205 client_handle_transmission_status, executor);
f2b3ef9f
JG		 206}
207
208static int action_executor_start_session_handler(struct action_executor *executor,
209 const struct action_work_item *work_item,
210 const struct lttng_action *action)
211{
212 int ret = 0;
213 const char *session_name;
214 enum lttng_action_status action_status;
215 struct ltt_session *session;
216 enum lttng_error_code cmd_ret;
217
218 action_status = lttng_action_start_session_get_session_name(
219 action, &session_name);
220 if (action_status != LTTNG_ACTION_STATUS_OK) {
221 ERR("Failed to get session name from `%s` action",
222 get_action_name(action));
223 ret = -1;
224 goto end;
225 }
226
227 session_lock_list();
228 session = session_find_by_name(session_name);
229 if (!session) {
34f87583 230 DBG("Failed to find session `%s` by name while executing `%s` action of trigger `%s`",
f2b3ef9f 231 session_name, get_action_name(action),
34f87583 232 get_trigger_name(work_item->trigger));
f2b3ef9f
JG		 233 goto error_unlock_list;
234 }
235
236 session_lock(session);
237 if (!is_trigger_allowed_for_session(work_item->trigger, session)) {
238 goto error_dispose_session;
239 }
240
241 cmd_ret = cmd_start_trace(session);
242 switch (cmd_ret) {
243 case LTTNG_OK:
34f87583
JR		 244 DBG("Successfully started session `%s` on behalf of trigger `%s`",
245 session_name, get_trigger_name(work_item->trigger));
f2b3ef9f
JG		 246 break;
247 case LTTNG_ERR_TRACE_ALREADY_STARTED:
34f87583
JR		 248 DBG("Attempted to start session `%s` on behalf of trigger `%s` but it was already started",
249 session_name, get_trigger_name(work_item->trigger));
f2b3ef9f
JG		 250 break;
251 default:
34f87583
JR		 252 WARN("Failed to start session `%s` on behalf of trigger `%s`: %s",
253 session_name, get_trigger_name(work_item->trigger),
f2b3ef9f
JG		 254 lttng_strerror(-cmd_ret));
255 break;
256 }
257
258error_dispose_session:
259 session_unlock(session);
260 session_put(session);
261error_unlock_list:
262 session_unlock_list();
263end:
264 return ret;
265}
266
267static int action_executor_stop_session_handler(struct action_executor *executor,
268 const struct action_work_item *work_item,
269 const struct lttng_action *action)
270{
271 int ret = 0;
272 const char *session_name;
273 enum lttng_action_status action_status;
274 struct ltt_session *session;
275 enum lttng_error_code cmd_ret;
276
277 action_status = lttng_action_stop_session_get_session_name(
278 action, &session_name);
279 if (action_status != LTTNG_ACTION_STATUS_OK) {
280 ERR("Failed to get session name from `%s` action",
281 get_action_name(action));
282 ret = -1;
283 goto end;
284 }
285
286 session_lock_list();
287 session = session_find_by_name(session_name);
288 if (!session) {
34f87583 289 DBG("Failed to find session `%s` by name while executing `%s` action of trigger `%s`",
f2b3ef9f 290 session_name, get_action_name(action),
34f87583 291 get_trigger_name(work_item->trigger));
f2b3ef9f
JG		 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:
34f87583
JR		 303 DBG("Successfully stopped session `%s` on behalf of trigger `%s`",
304 session_name, get_trigger_name(work_item->trigger));
f2b3ef9f
JG		 305 break;
306 case LTTNG_ERR_TRACE_ALREADY_STOPPED:
34f87583
JR		 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));
f2b3ef9f
JG		 309 break;
310 default:
34f87583
JR		 311 WARN("Failed to stop session `%s` on behalf of trigger `%s`: %s",
312 session_name, get_trigger_name(work_item->trigger),
f2b3ef9f
JG		 313 lttng_strerror(-cmd_ret));
314 break;
315 }
316
317error_dispose_session:
318 session_unlock(session);
319 session_put(session);
320error_unlock_list:
321 session_unlock_list();
322end:
323 return ret;
324}
325
326static int action_executor_rotate_session_handler(struct action_executor *executor,
327 const struct action_work_item *work_item,
328 const struct lttng_action *action)
329{
330 int ret = 0;
331 const char *session_name;
332 enum lttng_action_status action_status;
333 struct ltt_session *session;
334 enum lttng_error_code cmd_ret;
335
336 action_status = lttng_action_rotate_session_get_session_name(
337 action, &session_name);
338 if (action_status != LTTNG_ACTION_STATUS_OK) {
339 ERR("Failed to get session name from `%s` action",
340 get_action_name(action));
341 ret = -1;
342 goto end;
343 }
344
345 session_lock_list();
346 session = session_find_by_name(session_name);
347 if (!session) {
34f87583 348 DBG("Failed to find session `%s` by name while executing `%s` action of trigger `%s`",
f2b3ef9f 349 session_name, get_action_name(action),
34f87583 350 get_trigger_name(work_item->trigger));
f2b3ef9f
JG		 351 goto error_unlock_list;
352 }
353
354 session_lock(session);
355 if (!is_trigger_allowed_for_session(work_item->trigger, session)) {
356 goto error_dispose_session;
357 }
358
359 cmd_ret = cmd_rotate_session(session, NULL, false,
360 LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED);
361 switch (cmd_ret) {
362 case LTTNG_OK:
34f87583
JR		 363 DBG("Successfully started rotation of session `%s` on behalf of trigger `%s`",
364 session_name, get_trigger_name(work_item->trigger));
f2b3ef9f
JG		 365 break;
366 case LTTNG_ERR_ROTATION_PENDING:
34f87583
JR		 367 DBG("Attempted to start a rotation of session `%s` on behalf of trigger `%s` but a rotation is already ongoing",
368 session_name, get_trigger_name(work_item->trigger));
f2b3ef9f
JG		 369 break;
370 case LTTNG_ERR_ROTATION_MULTIPLE_AFTER_STOP:
371 case LTTNG_ERR_ROTATION_AFTER_STOP_CLEAR:
34f87583
JR		 372 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",
373 session_name, get_trigger_name(work_item->trigger));
f2b3ef9f
JG		 374 break;
375 default:
34f87583
JR		 376 WARN("Failed to start a rotation of session `%s` on behalf of trigger `%s`: %s",
377 session_name, get_trigger_name(work_item->trigger),
f2b3ef9f
JG		 378 lttng_strerror(-cmd_ret));
379 break;
380 }
381
382error_dispose_session:
383 session_unlock(session);
384 session_put(session);
385error_unlock_list:
386 session_unlock_list();
387end:
388 return ret;
389}
390
391static int action_executor_snapshot_session_handler(struct action_executor *executor,
392 const struct action_work_item *work_item,
393 const struct lttng_action *action)
394{
395 int ret = 0;
396 const char *session_name;
397 enum lttng_action_status action_status;
398 struct ltt_session *session;
399 const struct lttng_snapshot_output default_snapshot_output = {
400 .max_size = UINT64_MAX,
401 };
402 const struct lttng_snapshot_output *snapshot_output =
403 &default_snapshot_output;
404 enum lttng_error_code cmd_ret;
405
406 action_status = lttng_action_snapshot_session_get_session_name(
407 action, &session_name);
408 if (action_status != LTTNG_ACTION_STATUS_OK) {
409 ERR("Failed to get session name from `%s` action",
410 get_action_name(action));
411 ret = -1;
412 goto end;
413 }
414
415 action_status = lttng_action_snapshot_session_get_output(
416 action, &snapshot_output);
417 if (action_status != LTTNG_ACTION_STATUS_OK &&
418 action_status != LTTNG_ACTION_STATUS_UNSET) {
419 ERR("Failed to get output from `%s` action",
420 get_action_name(action));
421 ret = -1;
422 goto end;
423 }
424
425 session_lock_list();
426 session = session_find_by_name(session_name);
427 if (!session) {
ca46af4e 428 DBG("Failed to find session `%s` by name while executing `%s` action of trigger `%s`",
f2b3ef9f 429 session_name, get_action_name(action),
ca46af4e 430 get_trigger_name(work_item->trigger));
f2b3ef9f
JG		 431 goto error_unlock_list;
432 }
433
434
435 session_lock(session);
436 if (!is_trigger_allowed_for_session(work_item->trigger, session)) {
437 goto error_dispose_session;
438 }
439
440 cmd_ret = cmd_snapshot_record(session, snapshot_output, 0);
441 switch (cmd_ret) {
442 case LTTNG_OK:
34f87583
JR		 443 DBG("Successfully recorded snapshot of session `%s` on behalf of trigger `%s`",
444 session_name, get_trigger_name(work_item->trigger));
f2b3ef9f
JG		 445 break;
446 default:
34f87583
JR		 447 WARN("Failed to record snapshot of session `%s` on behalf of trigger `%s`: %s",
448 session_name, get_trigger_name(work_item->trigger),
f2b3ef9f
JG		 449 lttng_strerror(-cmd_ret));
450 break;
451 }
452
453error_dispose_session:
454 session_unlock(session);
455 session_put(session);
456error_unlock_list:
457 session_unlock_list();
458end:
459 return ret;
460}
461
462static int action_executor_group_handler(struct action_executor *executor,
463 const struct action_work_item *work_item,
464 const struct lttng_action *action_group)
465{
466 int ret = 0;
467 unsigned int i, count;
468 enum lttng_action_status action_status;
469
470 action_status = lttng_action_group_get_count(action_group, &count);
471 if (action_status != LTTNG_ACTION_STATUS_OK) {
472 /* Fatal error. */
473 ERR("Failed to get count of action in action group");
474 ret = -1;
475 goto end;
476 }
477
478 DBG("Action group has %u action%s", count, count != 1 ? "s" : "");
479 for (i = 0; i < count; i++) {
480 const struct lttng_action *action =
481 lttng_action_group_get_at_index(
482 action_group, i);
483
484 ret = action_executor_generic_handler(
485 executor, work_item, action);
486 if (ret) {
34f87583
JR		 487 ERR("Stopping the execution of the action group of trigger `%s` following a fatal error",
488 get_trigger_name(work_item->trigger));
f2b3ef9f
JG		 489 goto end;
490 }
491 }
492end:
493 return ret;
494}
495
496static int action_executor_generic_handler(struct action_executor *executor,
497 const struct action_work_item *work_item,
498 const struct lttng_action *action)
499{
0e43bcbf
JG		 500 const enum lttng_action_type action_type = lttng_action_get_type(action);
501
502 assert(action_type != LTTNG_ACTION_TYPE_UNKNOWN);
503
2516f2d8 504 DBG("Executing action `%s` of trigger `%s` action work item %" PRIu64,
f2b3ef9f 505 get_action_name(action),
34f87583 506 get_trigger_name(work_item->trigger),
f2b3ef9f
JG		 507 work_item->id);
508
0e43bcbf 509 return action_executors[action_type](
f2b3ef9f
JG		 510 executor, work_item, action);
511}
512
513static int action_work_item_execute(struct action_executor *executor,
514 struct action_work_item *work_item)
515{
516 int ret;
517 const struct lttng_action *action =
518 lttng_trigger_get_const_action(work_item->trigger);
519
34f87583
JR		 520 DBG("Starting execution of action work item %" PRIu64 " of trigger `%s`",
521 work_item->id, get_trigger_name(work_item->trigger));
f2b3ef9f 522 ret = action_executor_generic_handler(executor, work_item, action);
34f87583
JR		 523 DBG("Completed execution of action work item %" PRIu64 " of trigger `%s`",
524 work_item->id, get_trigger_name(work_item->trigger));
f2b3ef9f
JG		 525 return ret;
526}
527
528static void action_work_item_destroy(struct action_work_item *work_item)
529{
530 lttng_trigger_put(work_item->trigger);
531 lttng_evaluation_destroy(work_item->evaluation);
532 notification_client_list_put(work_item->client_list);
533 free(work_item);
534}
535
536static void *action_executor_thread(void *_data)
537{
538 struct action_executor *executor = _data;
539
540 assert(executor);
541
412d7227
SM		 542 health_register(the_health_sessiond,
543 HEALTH_SESSIOND_TYPE_ACTION_EXECUTOR);
f2b3ef9f
JG		 544
545 rcu_register_thread();
546 rcu_thread_online();
547
548 DBG("Entering work execution loop");
549 pthread_mutex_lock(&executor->work.lock);
550 while (!executor->should_quit) {
551 int ret;
552 struct action_work_item *work_item;
553
554 health_code_update();
555 if (executor->work.pending_count == 0) {
556 health_poll_entry();
557 DBG("No work items enqueued, entering wait");
558 pthread_cond_wait(&executor->work.cond,
559 &executor->work.lock);
560 DBG("Woke-up from wait");
561 health_poll_exit();
562 continue;
563 }
564
0db0f8e0 565 /* Pop item from front of the list with work lock held. */
f2b3ef9f
JG		 566 work_item = cds_list_first_entry(&executor->work.list,
567 struct action_work_item, list_node);
568 cds_list_del(&work_item->list_node);
569 executor->work.pending_count--;
570
571 /*
572 * Work can be performed without holding the work lock,
573 * allowing new items to be queued.
574 */
575 pthread_mutex_unlock(&executor->work.lock);
576 ret = action_work_item_execute(executor, work_item);
577 action_work_item_destroy(work_item);
578 if (ret) {
579 /* Fatal error. */
580 break;
581 }
582
583 health_code_update();
584 pthread_mutex_lock(&executor->work.lock);
585 }
586
f5f5c54d
JG		 587 if (executor->should_quit) {
588 pthread_mutex_unlock(&executor->work.lock);
589 }
f2b3ef9f
JG		 590 DBG("Left work execution loop");
591
592 health_code_update();
593
594 rcu_thread_offline();
595 rcu_unregister_thread();
412d7227 596 health_unregister(the_health_sessiond);
f2b3ef9f
JG		 597
598 return NULL;
599}
600
601static bool shutdown_action_executor_thread(void *_data)
602{
603 struct action_executor *executor = _data;
604
8db3acaf 605 pthread_mutex_lock(&executor->work.lock);
f2b3ef9f
JG		 606 executor->should_quit = true;
607 pthread_cond_signal(&executor->work.cond);
8db3acaf 608 pthread_mutex_unlock(&executor->work.lock);
f2b3ef9f
JG		 609 return true;
610}
611
612static void clean_up_action_executor_thread(void *_data)
613{
614 struct action_executor *executor = _data;
615
616 assert(cds_list_empty(&executor->work.list));
617
618 pthread_mutex_destroy(&executor->work.lock);
619 pthread_cond_destroy(&executor->work.cond);
620 free(executor);
621}
622
623struct action_executor *action_executor_create(
624 struct notification_thread_handle *handle)
625{
626 struct action_executor *executor = zmalloc(sizeof(*executor));
627
628 if (!executor) {
629 goto end;
630 }
631
632 CDS_INIT_LIST_HEAD(&executor->work.list);
633 pthread_cond_init(&executor->work.cond, NULL);
634 pthread_mutex_init(&executor->work.lock, NULL);
635 executor->notification_thread_handle = handle;
636
637 executor->thread = lttng_thread_create(THREAD_NAME,
638 action_executor_thread, shutdown_action_executor_thread,
639 clean_up_action_executor_thread, executor);
640end:
641 return executor;
642}
643
644void action_executor_destroy(struct action_executor *executor)
645{
646 struct action_work_item *work_item, *tmp;
647
648 /* TODO Wait for work list to drain? */
649 lttng_thread_shutdown(executor->thread);
650 pthread_mutex_lock(&executor->work.lock);
651 if (executor->work.pending_count != 0) {
652 WARN("%" PRIu64
653 " trigger action%s still queued for execution and will be discarded",
654 executor->work.pending_count,
655 executor->work.pending_count == 1 ? " is" :
656 "s are");
657 }
658
659 cds_list_for_each_entry_safe (
660 work_item, tmp, &executor->work.list, list_node) {
661 WARN("Discarding action work item %" PRIu64
34f87583
JR		 662 " associated to trigger `%s`",
663 work_item->id, get_trigger_name(work_item->trigger));
f2b3ef9f
JG		 664 cds_list_del(&work_item->list_node);
665 action_work_item_destroy(work_item);
666 }
667 pthread_mutex_unlock(&executor->work.lock);
668 lttng_thread_put(executor->thread);
669}
670
671/* RCU read-lock must be held by the caller. */
672enum action_executor_status action_executor_enqueue(
673 struct action_executor *executor,
674 struct lttng_trigger *trigger,
675 struct lttng_evaluation *evaluation,
676 const struct lttng_credentials *object_creds,
677 struct notification_client_list *client_list)
678{
679 enum action_executor_status executor_status = ACTION_EXECUTOR_STATUS_OK;
680 const uint64_t work_item_id = executor->next_work_item_id++;
681 struct action_work_item *work_item;
682 bool signal = false;
683
684 pthread_mutex_lock(&executor->work.lock);
685 /* Check for queue overflow. */
686 if (executor->work.pending_count >= MAX_QUEUED_WORK_COUNT) {
687 /* Most likely spammy, remove if it is the case. */
34f87583
JR		 688 DBG("Refusing to enqueue action for trigger `%s` as work item %" PRIu64
689 " (overflow)", get_trigger_name(trigger), work_item_id);
f2b3ef9f
JG		 690 executor_status = ACTION_EXECUTOR_STATUS_OVERFLOW;
691 goto error_unlock;
692 }
693
694 work_item = zmalloc(sizeof(*work_item));
695 if (!work_item) {
2516f2d8 696 PERROR("Failed to allocate action executor work item on behalf of trigger `%s`",
34f87583 697 get_trigger_name(trigger));
f2b3ef9f
JG		 698 executor_status = ACTION_EXECUTOR_STATUS_ERROR;
699 goto error_unlock;
700 }
701
702 lttng_trigger_get(trigger);
703 if (client_list) {
704 const bool reference_acquired =
705 notification_client_list_get(client_list);
706
707 assert(reference_acquired);
708 }
709
710 *work_item = (typeof(*work_item)){
711 .id = work_item_id,
712 .trigger = trigger,
713 /* Ownership transferred to the work item. */
714 .evaluation = evaluation,
715 .object_creds = {
716 .is_set = !!object_creds,
717 .value = object_creds ? *object_creds :
718 (typeof(work_item->object_creds.value)) {},
719 },
720 .client_list = client_list,
721 .list_node = CDS_LIST_HEAD_INIT(work_item->list_node),
722 };
723
724 evaluation = NULL;
725 cds_list_add_tail(&work_item->list_node, &executor->work.list);
726 executor->work.pending_count++;
2516f2d8 727 DBG("Enqueued action for trigger `%s` as work item #%" PRIu64,
34f87583 728 get_trigger_name(trigger), work_item_id);
f2b3ef9f
JG		 729 signal = true;
730
731error_unlock:
f2b3ef9f
JG		 732 if (signal) {
733 pthread_cond_signal(&executor->work.cond);
734 }
8db3acaf 735 pthread_mutex_unlock(&executor->work.lock);
f2b3ef9f
JG		 736
737 lttng_evaluation_destroy(evaluation);
738 return executor_status;
739}
LTTng 2.0 tools and control repository
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