NAME
	set_heart_beat - enable or disable heartbeat in this object

SYNTAX
	int set_heart_beat(int flag);

DESCRIPTION
	Enable or disable heart beat. If the heart beat is not needed for
	the moment, then do disable it. This will reduce system overhead.

RETURN VALUES
	0 if the state wasn't changed.
	1 if the state was changed.

SEE ALSO
	lfun/heart_beat
