sessiond: synchronize event notifiers for UST tracers and the kernel tracer

[lttng-tools.git] / src / bin / lttng-sessiond / dispatch.c

diff --git a/src/bin/lttng-sessiond/dispatch.c b/src/bin/lttng-sessiond/dispatch.c
index 52d253d47d3578923d5fbf69c1ce52b438ee5330..d33a3cba8fac0d231aabd527400b83adc7645d6f 100644 (file)
--- a/src/bin/lttng-sessiond/dispatch.c
+++ b/src/bin/lttng-sessiond/dispatch.c
@@ -36,6 +36,7 @@ static void update_ust_app(int app_sock)
 {
        struct ltt_session *sess, *stmp;
        const struct ltt_session_list *session_list = session_get_list();
+       struct ust_app *app;
 
        /* Consumer is in an ERROR state. Stop any application update. */
        if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) {
@@ -43,10 +44,25 @@ static void update_ust_app(int app_sock)
                return;
        }
 
+       rcu_read_lock();
+       assert(app_sock >= 0);
+       app = ust_app_find_by_sock(app_sock);
+       if (app == NULL) {
+               /*
+                * Application can be unregistered before so
+                * this is possible hence simply stopping the
+                * update.
+                */
+               DBG3("UST app update failed to find app sock %d",
+                       app_sock);
+               goto unlock_rcu;
+       }
+
+       /* Update all event notifiers for the app. */
+       ust_app_global_update_event_notifier_rules(app);
+
        /* For all tracing session(s) */
        cds_list_for_each_entry_safe(sess, stmp, &session_list->head, list) {
-               struct ust_app *app;
-
                if (!session_get(sess)) {
                        continue;
                }
@@ -55,26 +71,14 @@ static void update_ust_app(int app_sock)
                        goto unlock_session;
                }
 
-               rcu_read_lock();
-               assert(app_sock >= 0);
-               app = ust_app_find_by_sock(app_sock);
-               if (app == NULL) {
-                       /*
-                        * Application can be unregistered before so
-                        * this is possible hence simply stopping the
-                        * update.
-                        */
-                       DBG3("UST app update failed to find app sock %d",
-                               app_sock);
-                       goto unlock_rcu;
-               }
                ust_app_global_update(sess->ust_session, app);
-       unlock_rcu:
-               rcu_read_unlock();
        unlock_session:
                session_unlock(sess);
                session_put(sess);
        }
+
+unlock_rcu:
+       rcu_read_unlock();
 }
 
 /*