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trigger: keep state of if a trigger is currently registered
[lttng-tools.git]
/
src
/
bin
/
lttng-sessiond
/
notification-thread-events.c
diff --git
a/src/bin/lttng-sessiond/notification-thread-events.c
b/src/bin/lttng-sessiond/notification-thread-events.c
index 59b10e9db718f82c791abbddd4f8d1e4a8d20ded..ec4d56bce7d9ec78c6c6926e256e376f59b6297a 100644
(file)
--- a/
src/bin/lttng-sessiond/notification-thread-events.c
+++ b/
src/bin/lttng-sessiond/notification-thread-events.c
@@
-1089,6
+1089,7
@@
int notification_thread_client_subscribe(struct notification_client *client,
struct notification_client_list *client_list = NULL;
struct lttng_condition_list_element *condition_list_element = NULL;
struct notification_client_list_element *client_list_element = NULL;
struct notification_client_list *client_list = NULL;
struct lttng_condition_list_element *condition_list_element = NULL;
struct notification_client_list_element *client_list_element = NULL;
+ struct lttng_trigger_ht_element *trigger_ht_element;
enum lttng_notification_channel_status status =
LTTNG_NOTIFICATION_CHANNEL_STATUS_OK;
enum lttng_notification_channel_status status =
LTTNG_NOTIFICATION_CHANNEL_STATUS_OK;
@@
-1138,11
+1139,11
@@
int notification_thread_client_subscribe(struct notification_client *client,
* at this point so that conditions that are already TRUE result
* in a notification being sent out.
*
* at this point so that conditions that are already TRUE result
* in a notification being sent out.
*
- * The client_list's trigger is used without locking the list itself.
- * This is correct since the list doesn't own the trigger and the
- * object is immutable.
+ * Note the iteration on all triggers which share an identical
+ * `condition` than the one to which the client is registering. This is
+ * done to ensure that the client receives a distinct notification for
+ * all triggers that have a `notify` action that have this condition.
*/
*/
- struct lttng_trigger_ht_element *trigger_ht_element;
pthread_mutex_lock(&client_list->lock);
cds_list_for_each_entry(trigger_ht_element,
&client_list->triggers_list, client_list_trigger_node) {
pthread_mutex_lock(&client_list->lock);
cds_list_for_each_entry(trigger_ht_element,
&client_list->triggers_list, client_list_trigger_node) {
@@
-1151,6
+1152,7
@@
int notification_thread_client_subscribe(struct notification_client *client,
WARN("[notification-thread] Evaluation of a condition on client subscription failed, aborting.");
ret = -1;
free(client_list_element);
WARN("[notification-thread] Evaluation of a condition on client subscription failed, aborting.");
ret = -1;
free(client_list_element);
+ pthread_mutex_unlock(&client_list->lock);
goto end;
}
}
goto end;
}
}
@@
-2691,6
+2693,9
@@
int handle_notification_thread_command_register_trigger(
goto error_free_ht_element;
}
goto error_free_ht_element;
}
+ /* From this point consider the trigger registered. */
+ lttng_trigger_set_as_registered(trigger);
+
/*
* Some triggers might need a tracer notifier depending on its
* condition and actions.
/*
* Some triggers might need a tracer notifier depending on its
* condition and actions.
@@
-2890,6
+2895,11
@@
error_free_ht_element:
}
error:
if (free_trigger) {
}
error:
if (free_trigger) {
+ /*
+ * Other objects might have a reference to the trigger, mark it
+ * as unregistered.
+ */
+ lttng_trigger_set_as_unregistered(trigger);
lttng_trigger_destroy(trigger);
}
end:
lttng_trigger_destroy(trigger);
}
end:
@@
-2971,6
+2981,12
@@
int handle_notification_thread_command_unregister_trigger(
cmd_reply = LTTNG_OK;
}
cmd_reply = LTTNG_OK;
}
+ trigger_ht_element = caa_container_of(triggers_ht_node,
+ struct lttng_trigger_ht_element, node);
+
+ /* From this point, consider the trigger unregistered no matter what. */
+ lttng_trigger_set_as_unregistered(trigger_ht_element->trigger);
+
/* Remove trigger from channel_triggers_ht. */
cds_lfht_for_each_entry(state->channel_triggers_ht, &iter, trigger_list,
channel_triggers_ht_node) {
/* Remove trigger from channel_triggers_ht. */
cds_lfht_for_each_entry(state->channel_triggers_ht, &iter, trigger_list,
channel_triggers_ht_node) {
@@
-2993,9
+3009,6
@@
int handle_notification_thread_command_unregister_trigger(
teardown_tracer_notifier(state, trigger);
}
teardown_tracer_notifier(state, trigger);
}
- trigger_ht_element = caa_container_of(triggers_ht_node,
- struct lttng_trigger_ht_element, node);
-
if (is_trigger_action_notify(trigger)) {
/*
* Remove and release the client list from
if (is_trigger_action_notify(trigger)) {
/*
* Remove and release the client list from
@@
-4333,7
+4346,7
@@
int notification_client_list_send_evaluation(
}
}
}
}
- if (client->uid != lttng_credentials_get_uid(trigger_creds)
&& client->gid != lttng_credentials_get_gid(trigger_creds)
) {
+ if (client->uid != lttng_credentials_get_uid(trigger_creds)) {
DBG("[notification-thread] Skipping client at it does not have the permission to receive notification for this trigger");
goto skip_client;
}
DBG("[notification-thread] Skipping client at it does not have the permission to receive notification for this trigger");
goto skip_client;
}
@@
-4521,13
+4534,6
@@
int dispatch_one_event_notifier_notification(struct notification_thread_state *s
struct notification_trigger_tokens_ht_element,
node);
struct notification_trigger_tokens_ht_element,
node);
- if (!lttng_trigger_should_fire(element->trigger)) {
- ret = 0;
- goto end_unlock;
- }
-
- lttng_trigger_fire(element->trigger);
-
trigger_status = lttng_trigger_get_name(element->trigger, &trigger_name);
assert(trigger_status == LTTNG_TRIGGER_STATUS_OK);
trigger_status = lttng_trigger_get_name(element->trigger, &trigger_name);
assert(trigger_status == LTTNG_TRIGGER_STATUS_OK);
@@
-4550,7
+4556,6
@@
int dispatch_one_event_notifier_notification(struct notification_thread_state *s
element->trigger),
struct lttng_condition_on_event,
parent),
element->trigger),
struct lttng_condition_on_event,
parent),
- trigger_name,
notification->capture_buffer,
notification->capture_buf_size, false);
notification->capture_buffer,
notification->capture_buf_size, false);
@@
-4840,12
+4845,6
@@
int handle_notification_thread_channel_sample(
goto put_list;
}
goto put_list;
}
- if (!lttng_trigger_should_fire(trigger)) {
- goto put_list;
- }
-
- lttng_trigger_fire(trigger);
-
/*
* Ownership of `evaluation` transferred to the action executor
* no matter the result.
/*
* Ownership of `evaluation` transferred to the action executor
* no matter the result.
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