+ struct lttng_ht_node_ulong notify_sock_n;
+ /*
+ * This is a list of ust app session that, once the app is going into
+ * teardown mode, in the RCU call, each node in this list is removed and
+ * deleted.
+ *
+ * Element of the list are added when an application unregisters after each
+ * ht_del of ust_app_session associated to this app. This list is NOT used
+ * when a session is destroyed.
+ */
+ struct cds_list_head teardown_head;
+ /*
+ * Hash table containing ust_app_channel indexed by channel objd.
+ */
+ struct lttng_ht *ust_objd;