Thread-safe cap initiliazation.

libp2p/Host.cpp

@@ -219,8 +219,8 @@ void Host::startPeerSession(Public const& _id, RLP const& _rlp, RLPXFrameIO* _io
 					ps->disconnect(DuplicatePeer);
 					return;
 				}
-		m_sessions[_id] = ps;
-	}
+		
+		// todo: mutex Session::m_capabilities and move for(:caps) out of mutex.
 		unsigned o = (unsigned)UserPacket;
 		for (auto const& i: caps)
 			if (haveCapability(i))
@@ -229,6 +229,9 @@ void Host::startPeerSession(Public const& _id, RLP const& _rlp, RLPXFrameIO* _io
 				o += m_capabilities[i]->messageCount();
 			}
 		ps->start();
+		m_sessions[_id] = ps;
+	}
+	
 	clog(NetNote) << "p2p.host.peer.register" << _id.abridged();
 	StructuredLogger::p2pConnected(_id.abridged(), ps->m_peer->peerEndpoint(), ps->m_peer->m_lastConnected, clientVersion, peerCount());
 }