code: func newPriorityClientPool(freeClientCap uint64, ps *peerSet, child clientPool) *priorityClientPool {
  	return &priorityClientPool{
  		clients:       make(map[enode.ID]priorityClientInfo),
  		freeClientCap: freeClientCap,
  		ps:            ps,
  		child:         child,
  	}
  }
docs: // newPriorityClientPool creates a new priority client pool