func (ps *PeerSet) List() []*Peer {
	ps.mtx.Lock()
	defer ps.mtx.Unlock()
	return ps.list
}
func (ps *PeerSet) List() []*Peer {
	ps.mtx.Lock()
	defer ps.mtx.Unlock()
	return ps.list
}
func ( ps * PeerSet ) List ( ) [ ] * Peer { ps . mtx . Lock ( ) defer ps . mtx . Unlock ( ) return ps . list }
// threadsafe list of peers.
threadsafe list of peers .