diff --git a/nlsr.h b/nlsr.h
index 1bfc5b6..95087d3 100644
--- a/nlsr.h
+++ b/nlsr.h
@@ -5,6 +5,8 @@
 #define LSDB_SYNCH_INTERVAL 300
 #define INTEREST_RETRY 3
 #define INTEREST_RESEND_TIME 15
+#define NLSR_LOCKED 1
+#define NLSR_UNLOCKED 0
 
 struct name_prefix
 {
@@ -79,6 +81,9 @@
 void process_conf_command(char *command);
 int readConfigFile(const char *filename);
 
+void nlsr_lock(void);
+void nlsr_unlock(void);
+
 int init_nlsr(void);
 void nlsr_destroy( void );
 void nlsr_stop_signal_handler(int sig);