updated="update_ack"
update_no=0
function init(){
barrier = stigmergy.create(101)
barrier.put(id,1)
barrier_val=0
barrier.onconflict(function (k,l,r) {
if(r. data < l. data or (r. data == l. data )) return l
else return r
})

s = swarm.create(1)
s.join()
}

function stand_by(){

barrier.get(id)
barrier_val = barrier.size()

neighbors.listen(updated,
   function(vid, value, rid) {
	print("  got from",vid,"  ", " value = ",value," ","rid"," " )
      if(value==update_no) barrier_val=ROBOTS
   }
)

}


function step() {

stand_by()

}