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d1ba29d2 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> | |
19 | #include <lttng/action/notify.h> | |
20 | #include <lttng/action/rotate-session.h> | |
21 | #include <lttng/action/snapshot-session.h> | |
22 | #include <lttng/action/start-session.h> | |
23 | #include <lttng/action/stop-session.h> | |
24 | #include <lttng/condition/evaluation.h> | |
25 | #include <lttng/lttng-error.h> | |
26 | #include <lttng/trigger/trigger-internal.h> | |
27 | #include <pthread.h> | |
28 | #include <stdbool.h> | |
29 | #include <stddef.h> | |
30 | #include <urcu/list.h> | |
31 | ||
32 | #define THREAD_NAME "Action Executor" | |
33 | #define MAX_QUEUED_WORK_COUNT 8192 | |
34 | ||
35 | struct action_work_item { | |
36 | uint64_t id; | |
37 | struct lttng_trigger *trigger; | |
38 | struct lttng_evaluation *evaluation; | |
39 | struct notification_client_list *client_list; | |
40 | LTTNG_OPTIONAL(struct lttng_credentials) object_creds; | |
41 | struct cds_list_head list_node; | |
42 | }; | |
43 | ||
44 | struct action_executor { | |
45 | struct lttng_thread *thread; | |
46 | struct notification_thread_handle *notification_thread_handle; | |
47 | struct { | |
48 | uint64_t pending_count; | |
49 | struct cds_list_head list; | |
50 | pthread_cond_t cond; | |
51 | pthread_mutex_t lock; | |
52 | } work; | |
53 | bool should_quit; | |
54 | uint64_t next_work_item_id; | |
55 | }; | |
56 | ||
57 | typedef int (*action_executor_handler)(struct action_executor *executor, | |
58 | const struct action_work_item *, | |
59 | const struct lttng_action *action); | |
60 | ||
61 | static int action_executor_notify_handler(struct action_executor *executor, | |
62 | const struct action_work_item *, | |
63 | const struct lttng_action *); | |
64 | static int action_executor_start_session_handler(struct action_executor *executor, | |
65 | const struct action_work_item *, | |
66 | const struct lttng_action *); | |
67 | static int action_executor_stop_session_handler(struct action_executor *executor, | |
68 | const struct action_work_item *, | |
69 | const struct lttng_action *); | |
70 | static int action_executor_rotate_session_handler(struct action_executor *executor, | |
71 | const struct action_work_item *, | |
72 | const struct lttng_action *); | |
73 | static int action_executor_snapshot_session_handler(struct action_executor *executor, | |
74 | const struct action_work_item *, | |
75 | const struct lttng_action *); | |
76 | static int action_executor_group_handler(struct action_executor *executor, | |
77 | const struct action_work_item *, | |
78 | const struct lttng_action *); | |
79 | static int action_executor_generic_handler(struct action_executor *executor, | |
80 | const struct action_work_item *, | |
81 | const struct lttng_action *); | |
82 | ||
83 | static const action_executor_handler action_executors[] = { | |
84 | [LTTNG_ACTION_TYPE_NOTIFY] = action_executor_notify_handler, | |
85 | [LTTNG_ACTION_TYPE_START_SESSION] = action_executor_start_session_handler, | |
86 | [LTTNG_ACTION_TYPE_STOP_SESSION] = action_executor_stop_session_handler, | |
87 | [LTTNG_ACTION_TYPE_ROTATE_SESSION] = action_executor_rotate_session_handler, | |
88 | [LTTNG_ACTION_TYPE_SNAPSHOT_SESSION] = action_executor_snapshot_session_handler, | |
89 | [LTTNG_ACTION_TYPE_GROUP] = action_executor_group_handler, | |
90 | }; | |
91 | ||
92 | static const char *action_type_names[] = { | |
93 | [LTTNG_ACTION_TYPE_NOTIFY] = "Notify", | |
94 | [LTTNG_ACTION_TYPE_START_SESSION] = "Start session", | |
95 | [LTTNG_ACTION_TYPE_STOP_SESSION] = "Stop session", | |
96 | [LTTNG_ACTION_TYPE_ROTATE_SESSION] = "Rotate session", | |
97 | [LTTNG_ACTION_TYPE_SNAPSHOT_SESSION] = "Snapshot session", | |
98 | [LTTNG_ACTION_TYPE_GROUP] = "Group", | |
99 | }; | |
100 | ||
101 | static const char *get_action_name(const struct lttng_action *action) | |
102 | { | |
103 | return action_type_names[lttng_action_get_type_const(action)]; | |
104 | } | |
105 | ||
106 | static int client_handle_transmission_status( | |
107 | struct notification_client *client, | |
108 | enum client_transmission_status status, | |
109 | void *user_data) | |
110 | { | |
111 | int ret = 0; | |
112 | struct action_executor *executor = user_data; | |
113 | bool update_communication = true; | |
114 | ||
115 | ASSERT_LOCKED(client->lock); | |
116 | ||
117 | switch (status) { | |
118 | case CLIENT_TRANSMISSION_STATUS_COMPLETE: | |
119 | DBG("Successfully sent full notification to client, client_id = %" PRIu64, | |
120 | client->id); | |
121 | update_communication = false; | |
122 | break; | |
123 | case CLIENT_TRANSMISSION_STATUS_QUEUED: | |
124 | DBG("Queued notification in client outgoing buffer, client_id = %" PRIu64, | |
125 | client->id); | |
126 | break; | |
127 | case CLIENT_TRANSMISSION_STATUS_FAIL: | |
128 | DBG("Communication error occurred while sending notification to client, client_id = %" PRIu64, | |
129 | client->id); | |
130 | client->communication.active = false; | |
131 | break; | |
132 | default: | |
133 | ERR("Fatal error encoutered while sending notification to client, client_id = %" PRIu64, | |
134 | client->id); | |
135 | client->communication.active = false; | |
136 | ret = -1; | |
137 | goto end; | |
138 | } | |
139 | ||
140 | if (!update_communication) { | |
141 | goto end; | |
142 | } | |
143 | ||
144 | ret = notification_thread_client_communication_update( | |
145 | executor->notification_thread_handle, client->id, | |
146 | status); | |
147 | end: | |
148 | return ret; | |
149 | } | |
150 | ||
151 | static int action_executor_notify_handler(struct action_executor *executor, | |
152 | const struct action_work_item *work_item, | |
153 | const struct lttng_action *action) | |
154 | { | |
155 | return notification_client_list_send_evaluation(work_item->client_list, | |
156 | lttng_trigger_get_const_condition(work_item->trigger), | |
157 | work_item->evaluation, | |
158 | lttng_trigger_get_credentials(work_item->trigger), | |
159 | LTTNG_OPTIONAL_GET_PTR(work_item->object_creds), | |
160 | client_handle_transmission_status, | |
161 | executor); | |
162 | } | |
163 | ||
164 | static int action_executor_start_session_handler(struct action_executor *executor, | |
165 | const struct action_work_item *work_item, | |
166 | const struct lttng_action *action) | |
167 | { | |
168 | int ret = 0; | |
169 | const char *session_name; | |
170 | enum lttng_action_status action_status; | |
171 | struct ltt_session *session; | |
172 | ||
173 | action_status = lttng_action_start_session_get_session_name( | |
174 | action, &session_name); | |
175 | if (action_status != LTTNG_ACTION_STATUS_OK) { | |
176 | ERR("Failed to get session name from \"%s\" action", | |
177 | get_action_name(action)); | |
178 | ret = -1; | |
179 | goto end; | |
180 | } | |
181 | ||
182 | session_lock_list(); | |
183 | session = session_find_by_name(session_name); | |
184 | if (session) { | |
185 | enum lttng_error_code cmd_ret; | |
186 | ||
187 | session_lock(session); | |
188 | cmd_ret = cmd_start_trace(session); | |
189 | session_unlock(session); | |
190 | ||
191 | switch (cmd_ret) { | |
192 | case LTTNG_OK: | |
193 | DBG("Successfully started session \"%s\" on behalf of trigger \"%p\"", | |
194 | session_name, | |
195 | work_item->trigger); | |
196 | break; | |
197 | case LTTNG_ERR_TRACE_ALREADY_STARTED: | |
198 | DBG("Attempted to start session \"%s\" on behalf of trigger \"%p\" but it was already started", | |
199 | session_name, | |
200 | work_item->trigger); | |
201 | break; | |
202 | default: | |
203 | WARN("Failed to start session \"%s\" on behalf of trigger \"%p\": %s", | |
204 | session_name, | |
205 | work_item->trigger, | |
206 | lttng_strerror(-cmd_ret)); | |
207 | break; | |
208 | } | |
209 | session_put(session); | |
210 | } else { | |
211 | DBG("Failed to find session \"%s\" by name while executing \"%s\" action of trigger \"%p\"", | |
212 | session_name, get_action_name(action), | |
213 | work_item->trigger); | |
214 | } | |
215 | session_unlock_list(); | |
216 | end: | |
217 | return ret; | |
218 | } | |
219 | ||
220 | static int action_executor_stop_session_handler(struct action_executor *executor, | |
221 | const struct action_work_item *work_item, | |
222 | const struct lttng_action *action) | |
223 | { | |
224 | int ret = 0; | |
225 | const char *session_name; | |
226 | enum lttng_action_status action_status; | |
227 | struct ltt_session *session; | |
228 | ||
229 | action_status = lttng_action_stop_session_get_session_name( | |
230 | action, &session_name); | |
231 | if (action_status != LTTNG_ACTION_STATUS_OK) { | |
232 | ERR("Failed to get session name from \"%s\" action", | |
233 | get_action_name(action)); | |
234 | ret = -1; | |
235 | goto end; | |
236 | } | |
237 | ||
238 | session_lock_list(); | |
239 | session = session_find_by_name(session_name); | |
240 | if (session) { | |
241 | enum lttng_error_code cmd_ret; | |
242 | ||
243 | session_lock(session); | |
244 | cmd_ret = cmd_stop_trace(session); | |
245 | session_unlock(session); | |
246 | ||
247 | switch (cmd_ret) { | |
248 | case LTTNG_OK: | |
249 | DBG("Successfully stopped session \"%s\" on behalf of trigger \"%p\"", | |
250 | session_name, | |
251 | work_item->trigger); | |
252 | break; | |
253 | case LTTNG_ERR_TRACE_ALREADY_STOPPED: | |
254 | DBG("Attempted to stop session \"%s\" on behalf of trigger \"%p\" but it was already stopped", | |
255 | session_name, | |
256 | work_item->trigger); | |
257 | break; | |
258 | default: | |
259 | WARN("Failed to stop session \"%s\" on behalf of trigger \"%p\": %s", | |
260 | session_name, | |
261 | work_item->trigger, | |
262 | lttng_strerror(-cmd_ret)); | |
263 | break; | |
264 | } | |
265 | session_put(session); | |
266 | } else { | |
267 | DBG("Failed to find session \"%s\" by name while executing \"%s\" action of trigger \"%p\"", | |
268 | session_name, get_action_name(action), | |
269 | work_item->trigger); | |
270 | } | |
271 | session_unlock_list(); | |
272 | end: | |
273 | return ret; | |
274 | } | |
275 | ||
276 | static int action_executor_rotate_session_handler(struct action_executor *executor, | |
277 | const struct action_work_item *work_item, | |
278 | const struct lttng_action *action) | |
279 | { | |
280 | int ret = 0; | |
281 | const char *session_name; | |
282 | enum lttng_action_status action_status; | |
283 | struct ltt_session *session; | |
284 | ||
285 | action_status = lttng_action_rotate_session_get_session_name( | |
286 | action, &session_name); | |
287 | if (action_status != LTTNG_ACTION_STATUS_OK) { | |
288 | ERR("Failed to get session name from \"%s\" action", | |
289 | get_action_name(action)); | |
290 | ret = -1; | |
291 | goto end; | |
292 | } | |
293 | ||
294 | session_lock_list(); | |
295 | session = session_find_by_name(session_name); | |
296 | if (session) { | |
297 | enum lttng_error_code cmd_ret; | |
298 | ||
299 | session_lock(session); | |
300 | cmd_ret = cmd_rotate_session(session, NULL, false, | |
301 | LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED); | |
302 | session_unlock(session); | |
303 | ||
304 | switch (cmd_ret) { | |
305 | case LTTNG_OK: | |
306 | DBG("Successfully started rotation of session \"%s\" on behalf of trigger \"%p\"", | |
307 | session_name, | |
308 | work_item->trigger); | |
309 | break; | |
310 | case LTTNG_ERR_ROTATION_PENDING: | |
311 | DBG("Attempted to start a rotation of session \"%s\" on behalf of trigger \"%p\" but a rotation is already ongoing", | |
312 | session_name, | |
313 | work_item->trigger); | |
314 | break; | |
315 | case LTTNG_ERR_ROTATION_MULTIPLE_AFTER_STOP: | |
316 | case LTTNG_ERR_ROTATION_AFTER_STOP_CLEAR: | |
317 | DBG("Attempted to start a rotation of session \"%s\" on behalf of trigger \"%p\" but a rotation has already been completed since the last stop or clear", | |
318 | session_name, | |
319 | work_item->trigger); | |
320 | break; | |
321 | default: | |
322 | WARN("Failed to start a rotation of session \"%s\" on behalf of trigger \"%p\": %s", | |
323 | session_name, | |
324 | work_item->trigger, | |
325 | lttng_strerror(-cmd_ret)); | |
326 | break; | |
327 | } | |
328 | session_put(session); | |
329 | } else { | |
330 | DBG("Failed to find session \"%s\" by name while executing \"%s\" action of trigger \"%p\"", | |
331 | session_name, get_action_name(action), | |
332 | work_item->trigger); | |
333 | } | |
334 | session_unlock_list(); | |
335 | end: | |
336 | return ret; | |
337 | } | |
338 | ||
339 | static int action_executor_snapshot_session_handler(struct action_executor *executor, | |
340 | const struct action_work_item *work_item, | |
341 | const struct lttng_action *action) | |
342 | { | |
343 | int ret = 0; | |
344 | const char *session_name; | |
345 | enum lttng_action_status action_status; | |
346 | struct ltt_session *session; | |
347 | const struct lttng_snapshot_output default_snapshot_output = { | |
348 | .max_size = UINT64_MAX, | |
349 | }; | |
350 | const struct lttng_snapshot_output *snapshot_output = | |
351 | &default_snapshot_output; | |
352 | ||
353 | action_status = lttng_action_snapshot_session_get_session_name( | |
354 | action, &session_name); | |
355 | if (action_status != LTTNG_ACTION_STATUS_OK) { | |
356 | ERR("Failed to get session name from \"%s\" action", | |
357 | get_action_name(action)); | |
358 | ret = -1; | |
359 | goto end; | |
360 | } | |
361 | ||
362 | action_status = lttng_action_snapshot_session_get_output( | |
363 | action, &snapshot_output); | |
364 | if (action_status != LTTNG_ACTION_STATUS_OK && | |
365 | action_status != LTTNG_ACTION_STATUS_UNSET) { | |
366 | ERR("Failed to get output from \"%s\" action", | |
367 | get_action_name(action)); | |
368 | ret = -1; | |
369 | goto end; | |
370 | } | |
371 | ||
372 | session_lock_list(); | |
373 | session = session_find_by_name(session_name); | |
374 | if (session) { | |
375 | enum lttng_error_code cmd_ret; | |
376 | ||
377 | session_lock(session); | |
378 | cmd_ret = cmd_snapshot_record(session, snapshot_output, 0); | |
379 | session_unlock(session); | |
380 | ||
381 | switch (cmd_ret) { | |
382 | case LTTNG_OK: | |
383 | DBG("Successfully recorded snapshot of session \"%s\" on behalf of trigger \"%p\"", | |
384 | session_name, | |
385 | work_item->trigger); | |
386 | break; | |
387 | default: | |
388 | WARN("Failed to record snapshot of session \"%s\" on behalf of trigger \"%p\": %s", | |
389 | session_name, | |
390 | work_item->trigger, | |
391 | lttng_strerror(-cmd_ret)); | |
392 | break; | |
393 | } | |
394 | session_put(session); | |
395 | } else { | |
396 | DBG("Failed to find session \"%s\" by name while executing \"%s\" action of trigger \"%p\"", | |
397 | session_name, get_action_name(action), | |
398 | work_item->trigger); | |
399 | } | |
400 | session_unlock_list(); | |
401 | end: | |
402 | return ret; | |
403 | } | |
404 | ||
405 | static int action_executor_group_handler(struct action_executor *executor, | |
406 | const struct action_work_item *work_item, | |
407 | const struct lttng_action *action_group) | |
408 | { | |
409 | int ret = 0; | |
410 | unsigned int i, count; | |
411 | enum lttng_action_status action_status; | |
412 | ||
413 | action_status = lttng_action_group_get_count(action_group, &count); | |
414 | if (action_status != LTTNG_ACTION_STATUS_OK) { | |
415 | /* Fatal error. */ | |
416 | ERR("Failed to get count of action in action group"); | |
417 | ret = -1; | |
418 | goto end; | |
419 | } | |
420 | ||
421 | DBG("Action group has %u action%s", count, count != 1 ? "s" : ""); | |
422 | for (i = 0; i < count; i++) { | |
423 | const struct lttng_action *action = | |
424 | lttng_action_group_get_at_index( | |
425 | action_group, i); | |
426 | ||
427 | ret = action_executor_generic_handler( | |
428 | executor, work_item, action); | |
429 | if (ret) { | |
430 | ERR("Stopping the execution of the action group of trigger \"%p\" following a fatal error", | |
431 | work_item->trigger); | |
432 | goto end; | |
433 | } | |
434 | } | |
435 | end: | |
436 | return ret; | |
437 | } | |
438 | ||
439 | static int action_executor_generic_handler(struct action_executor *executor, | |
440 | const struct action_work_item *work_item, | |
441 | const struct lttng_action *action) | |
442 | { | |
443 | DBG("Executing action \"%s\" of trigger \"%p\" action work item %" PRIu64, | |
444 | get_action_name(action), | |
445 | work_item->trigger, | |
446 | work_item->id); | |
447 | ||
448 | return action_executors[lttng_action_get_type_const(action)]( | |
449 | executor, work_item, action); | |
450 | } | |
451 | ||
452 | static int action_work_item_execute(struct action_executor *executor, | |
453 | struct action_work_item *work_item) | |
454 | { | |
455 | int ret; | |
456 | const struct lttng_action *action = | |
457 | lttng_trigger_get_const_action(work_item->trigger); | |
458 | ||
459 | DBG("Starting execution of action work item %" PRIu64 " of trigger \"%p\"", | |
460 | work_item->id, work_item->trigger); | |
461 | ret = action_executor_generic_handler(executor, work_item, action); | |
462 | DBG("Completed execution of action work item %" PRIu64 " of trigger \"%p\"", | |
463 | work_item->id, work_item->trigger); | |
464 | return ret; | |
465 | } | |
466 | ||
467 | static void action_work_item_destroy(struct action_work_item *work_item) | |
468 | { | |
469 | lttng_trigger_put(work_item->trigger); | |
470 | lttng_evaluation_destroy(work_item->evaluation); | |
471 | notification_client_list_put(work_item->client_list); | |
472 | free(work_item); | |
473 | } | |
474 | ||
475 | static void *action_executor_thread(void *_data) | |
476 | { | |
477 | struct action_executor *executor = _data; | |
478 | ||
479 | assert(executor); | |
480 | ||
481 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_ACTION_EXECUTOR); | |
482 | ||
483 | rcu_register_thread(); | |
484 | rcu_thread_online(); | |
485 | ||
486 | DBG("Entering work execution loop"); | |
487 | pthread_mutex_lock(&executor->work.lock); | |
488 | while (!executor->should_quit) { | |
489 | int ret; | |
490 | struct action_work_item *work_item; | |
491 | ||
492 | health_code_update(); | |
493 | if (executor->work.pending_count == 0) { | |
494 | health_poll_entry(); | |
495 | DBG("No work items enqueued, entering wait"); | |
496 | pthread_cond_wait(&executor->work.cond, | |
497 | &executor->work.lock); | |
498 | DBG("Woke-up from wait"); | |
499 | health_poll_exit(); | |
500 | continue; | |
501 | } | |
502 | ||
503 | /* Pop item from front of the listwith work lock held. */ | |
504 | work_item = cds_list_first_entry(&executor->work.list, | |
505 | struct action_work_item, list_node); | |
506 | cds_list_del(&work_item->list_node); | |
507 | executor->work.pending_count--; | |
508 | ||
509 | /* | |
510 | * Work can be performed without holding the work lock, | |
511 | * allowing new items to be queued. | |
512 | */ | |
513 | pthread_mutex_unlock(&executor->work.lock); | |
514 | ret = action_work_item_execute(executor, work_item); | |
515 | action_work_item_destroy(work_item); | |
516 | if (ret) { | |
517 | /* Fatal error. */ | |
518 | break; | |
519 | } | |
520 | ||
521 | health_code_update(); | |
522 | pthread_mutex_lock(&executor->work.lock); | |
523 | } | |
524 | ||
525 | pthread_mutex_unlock(&executor->work.lock); | |
526 | DBG("Left work execution loop"); | |
527 | ||
528 | health_code_update(); | |
529 | ||
530 | rcu_thread_offline(); | |
531 | rcu_unregister_thread(); | |
532 | health_unregister(health_sessiond); | |
533 | ||
534 | return NULL; | |
535 | } | |
536 | ||
537 | static bool shutdown_action_executor_thread(void *_data) | |
538 | { | |
539 | struct action_executor *executor = _data; | |
540 | ||
541 | executor->should_quit = true; | |
542 | pthread_cond_signal(&executor->work.cond); | |
543 | return true; | |
544 | } | |
545 | ||
546 | static void clean_up_action_executor_thread(void *_data) | |
547 | { | |
548 | struct action_executor *executor = _data; | |
549 | ||
550 | assert(cds_list_empty(&executor->work.list)); | |
551 | ||
552 | pthread_mutex_destroy(&executor->work.lock); | |
553 | pthread_cond_destroy(&executor->work.cond); | |
554 | free(executor); | |
555 | } | |
556 | ||
557 | struct action_executor *action_executor_create( | |
558 | struct notification_thread_handle *handle) | |
559 | { | |
560 | struct action_executor *executor = zmalloc(sizeof(*executor)); | |
561 | ||
562 | if (!executor) { | |
563 | goto end; | |
564 | } | |
565 | ||
566 | CDS_INIT_LIST_HEAD(&executor->work.list); | |
567 | pthread_cond_init(&executor->work.cond, NULL); | |
568 | pthread_mutex_init(&executor->work.lock, NULL); | |
569 | executor->notification_thread_handle = handle; | |
570 | ||
571 | executor->thread = lttng_thread_create(THREAD_NAME, | |
572 | action_executor_thread, shutdown_action_executor_thread, | |
573 | clean_up_action_executor_thread, executor); | |
574 | end: | |
575 | return executor; | |
576 | } | |
577 | ||
578 | void action_executor_destroy(struct action_executor *executor) | |
579 | { | |
580 | struct action_work_item *work_item, *tmp; | |
581 | ||
582 | /* TODO Wait for work list to drain? */ | |
583 | lttng_thread_shutdown(executor->thread); | |
584 | pthread_mutex_lock(&executor->work.lock); | |
585 | if (executor->work.pending_count != 0) { | |
586 | WARN("%" PRIu64 | |
587 | " trigger action%s still queued for execution and will be discarded", | |
588 | executor->work.pending_count, | |
589 | executor->work.pending_count == 1 ? " is" : | |
590 | "s are"); | |
591 | } | |
592 | ||
593 | cds_list_for_each_entry_safe ( | |
594 | work_item, tmp, &executor->work.list, list_node) { | |
595 | WARN("Discarding action work item %" PRIu64 | |
596 | " associated to trigger \"%p\"", | |
597 | work_item->id, work_item->trigger); | |
598 | cds_list_del(&work_item->list_node); | |
599 | action_work_item_destroy(work_item); | |
600 | } | |
601 | pthread_mutex_unlock(&executor->work.lock); | |
602 | lttng_thread_put(executor->thread); | |
603 | } | |
604 | ||
605 | /* RCU read-lock must be held by the caller. */ | |
606 | enum action_executor_status action_executor_enqueue( | |
607 | struct action_executor *executor, | |
608 | struct lttng_trigger *trigger, | |
609 | struct lttng_evaluation *evaluation, | |
610 | const struct lttng_credentials *object_creds, | |
611 | struct notification_client_list *client_list) | |
612 | { | |
613 | enum action_executor_status executor_status = ACTION_EXECUTOR_STATUS_OK; | |
614 | const uint64_t work_item_id = executor->next_work_item_id++; | |
615 | struct action_work_item *work_item; | |
616 | bool signal = false; | |
617 | ||
618 | pthread_mutex_lock(&executor->work.lock); | |
619 | /* Check for queue overflow. */ | |
620 | if (executor->work.pending_count >= MAX_QUEUED_WORK_COUNT) { | |
621 | /* Most likely spammy, remove if it is the case. */ | |
622 | DBG("Refusing to enqueue action for trigger \"%p\" as work item %" PRIu64 | |
623 | " (overflow)", | |
624 | trigger, work_item_id); | |
625 | executor_status = ACTION_EXECUTOR_STATUS_OVERFLOW; | |
626 | goto error_unlock; | |
627 | } | |
628 | ||
629 | work_item = zmalloc(sizeof(*work_item)); | |
630 | if (!work_item) { | |
631 | PERROR("Failed to allocate action executor work item on behalf of trigger \"%p\"", | |
632 | trigger); | |
633 | executor_status = ACTION_EXECUTOR_STATUS_ERROR; | |
634 | goto error_unlock; | |
635 | } | |
636 | ||
637 | lttng_trigger_get(trigger); | |
638 | if (client_list) { | |
639 | const bool reference_acquired = | |
640 | notification_client_list_get(client_list); | |
641 | ||
642 | assert(reference_acquired); | |
643 | } | |
644 | ||
645 | *work_item = (typeof(*work_item)){ | |
646 | .id = work_item_id, | |
647 | .trigger = trigger, | |
648 | /* Ownership transferred to the work item. */ | |
649 | .evaluation = evaluation, | |
650 | .object_creds = { | |
651 | .is_set = !!object_creds, | |
652 | .value = object_creds ? *object_creds : | |
653 | (typeof(work_item->object_creds.value)) {}, | |
654 | }, | |
655 | .client_list = client_list, | |
656 | .list_node = CDS_LIST_HEAD_INIT(work_item->list_node), | |
657 | }; | |
658 | ||
659 | evaluation = NULL; | |
660 | cds_list_add_tail(&work_item->list_node, &executor->work.list); | |
661 | executor->work.pending_count++; | |
662 | DBG("Enqueued action for trigger \"%p\" as work item %" PRIu64, | |
663 | trigger, work_item_id); | |
664 | signal = true; | |
665 | ||
666 | error_unlock: | |
667 | pthread_mutex_unlock(&executor->work.lock); | |
668 | if (signal) { | |
669 | pthread_cond_signal(&executor->work.cond); | |
670 | } | |
671 | ||
672 | lttng_evaluation_destroy(evaluation); | |
673 | return executor_status; | |
674 | } |