void UnlockExtension( extension_t *p_ext );
/* Lua specific functions */
+void vlclua_extension_set( lua_State *L, extension_t * );
extension_t *vlclua_extension_get( lua_State *L );
int lua_ExtensionActivate( extensions_manager_t *, extension_t * );
int lua_ExtensionDeactivate( extensions_manager_t *, extension_t * );