X-Git-Url: http://git.efficios.com/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Fsession.h;h=34e51fe5a85850445e126453c3fd869c0e4d4790;hp=a58de18f1d632ac2a6d782cd31ddc017079b38b0;hb=ae0a823f9f7e1d3800479488a58efc2f92f27d89;hpb=ab5be9fa2eb5ba9600a82cd18fd3cfcbac69169a

diff --git a/src/bin/lttng-sessiond/session.h b/src/bin/lttng-sessiond/session.h
index a58de18f1..34e51fe5a 100644
--- a/src/bin/lttng-sessiond/session.h
+++ b/src/bin/lttng-sessiond/session.h
@@ -195,13 +195,22 @@ struct ltt_session {
 	char *base_path;
 };
 
-/* Prototypes */
 enum lttng_error_code session_create(const char *name, uid_t uid, gid_t gid,
 		struct ltt_session **out_session);
 void session_lock(struct ltt_session *session);
+void session_unlock(struct ltt_session *session);
+
+/*
+ * The session list lock covers more ground than its name implies. While
+ * it does protect against concurent mutations of the session list, it is
+ * also used as a multi-session lock when synchronizing newly-registered
+ * 'user space tracer' and 'agent' applications.
+ *
+ * In other words, it prevents session configurations from changing while they
+ * are being transmitted to the various applications.
+ */
 void session_lock_list(void);
 int session_trylock_list(void);
-void session_unlock(struct ltt_session *session);
 void session_unlock_list(void);
 
 void session_destroy(struct ltt_session *session);
@@ -264,6 +273,9 @@ int session_close_trace_chunk(struct ltt_session *session,
 		enum lttng_trace_chunk_command_type close_command,
 		char *path);
 
+/* Open a packet in all channels of a given session. */
+enum lttng_error_code session_open_packets(struct ltt_session *session);
+
 bool session_output_supports_trace_chunks(const struct ltt_session *session);
 
 #endif /* _LTT_SESSION_H */