Fix: add missing rcu read side lock

[lttng-tools.git] / src / bin / lttng-sessiond / ust-app.h

diff --git a/src/bin/lttng-sessiond/ust-app.h b/src/bin/lttng-sessiond/ust-app.h
index d713f223b128ec7bd52fda53037046394885abe4..d4ed5a6f8d26e9b166fb59f519511f3aca99ada6 100644 (file)
--- a/src/bin/lttng-sessiond/ust-app.h
+++ b/src/bin/lttng-sessiond/ust-app.h
@@ -65,6 +65,12 @@ struct lttng_ht *ust_app_ht;
  */
 struct lttng_ht *ust_app_ht_by_sock;
 
+/* Stream list containing ust_app_stream. */
+struct ust_app_stream_list {
+       unsigned int count;
+       struct cds_list_head head;
+};
+
 struct ust_app_ctx {
        int handle;
        struct lttng_ust_context ctx;
@@ -82,13 +88,23 @@ struct ust_app_event {
        struct lttng_ust_filter_bytecode *filter;
 };
 
+struct ust_app_stream {
+       int handle;
+       char pathname[PATH_MAX];
+       /* Format is %s_%d respectively channel name and CPU number. */
+       char name[DEFAULT_STREAM_NAME_LEN];
+       struct lttng_ust_object_data *obj;
+       /* Using a list of streams to keep order. */
+       struct cds_list_head list;
+};
+
 struct ust_app_channel {
        int enabled;
        int handle;
        char name[LTTNG_UST_SYM_NAME_LEN];
        struct lttng_ust_channel attr;
        struct lttng_ust_object_data *obj;
-       struct ltt_ust_stream_list streams;
+       struct ust_app_stream_list streams;
        struct lttng_ht *ctx;
        struct lttng_ht *events;
        struct lttng_ht_node_str node;
@@ -107,6 +123,7 @@ struct ust_app_session {
        /* UID/GID of the user owning the session */
        uid_t uid;
        gid_t gid;
+       struct cds_list_head teardown_node;
 };
 
 /*
@@ -130,6 +147,16 @@ struct ust_app {
        struct lttng_ht *sessions;
        struct lttng_ht_node_ulong pid_n;
        struct lttng_ht_node_ulong 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;
 };
 
 #ifdef HAVE_LIBLTTNG_UST_CTL
@@ -146,7 +173,6 @@ int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app);
 int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app);
 int ust_app_start_trace_all(struct ltt_ust_session *usess);
 int ust_app_stop_trace_all(struct ltt_ust_session *usess);
-int ust_app_destroy_trace(struct ltt_ust_session *usess, struct ust_app *app);
 int ust_app_destroy_trace_all(struct ltt_ust_session *usess);
 int ust_app_list_events(struct lttng_event **events);
 int ust_app_list_event_fields(struct lttng_event_field **fields);