>2p works; non-netplay works again too.

OpenRA.Server/Server.cs

@@ -63,6 +63,8 @@ namespace OpenRA.Server
 	{
 		static List<Connection> conns = new List<Connection>();
 		static TcpListener listener = new TcpListener(IPAddress.Any, 1234);
+		static Dictionary<int, List<Connection>> inFlightFrames
+			= new Dictionary<int, List<Connection>>();
 
 		public static void Main(string[] args)
 		{
@@ -175,6 +177,8 @@ namespace OpenRA.Server
 								DispatchOrders(conn, conn.Frame, bytes);
 								conn.ExpectLength = 8;
 								conn.State = ReceiveState.Header;
+
+								UpdateInFlightFrames(conn);
 							} break;
 					}
 				}
@@ -183,6 +187,31 @@ namespace OpenRA.Server
 			//    conn.socket.RemoteEndPoint);
 		}
 
+		static void UpdateInFlightFrames(Connection conn)
+		{
+			if (conn.Frame != 0)
+			{
+				if (!inFlightFrames.ContainsKey(conn.Frame))
+				{
+					Console.WriteLine("{0} opens frame {1}",
+						conn.socket.RemoteEndPoint,
+						conn.Frame);
+					inFlightFrames[conn.Frame] = new List<Connection> { conn };
+				}
+				else
+					inFlightFrames[conn.Frame].Add(conn);
+
+				if (conns.All(c => inFlightFrames[conn.Frame].Contains(c)))
+				{
+					inFlightFrames.Remove(conn.Frame);
+					Console.WriteLine("frame {0} completed.",
+						conn.Frame);
+
+					DispatchOrders(null, conn.Frame, new byte[] { 0xef });
+				}
+			}
+		}
+
 		static void DispatchOrdersToClient(Connection c, int frame, byte[] data)
 		{
 			try

OpenRa.Game/OrderManager.cs

@@ -16,6 +16,7 @@ namespace OpenRa.Game
 		const int FramesAhead = 3;
 
 		public bool GameStarted { get { return frameNumber != 0; } }
+		public bool IsNetplay { get { return sources.OfType<NetworkOrderSource>().Any(); } }
 
 		public void StartGame()
 		{
@@ -32,6 +33,8 @@ namespace OpenRa.Game
 		public OrderManager( IEnumerable<OrderSource> sources )
 		{
 			this.sources = sources.ToList();
+			if (!IsNetplay)
+				StartGame();
 		}
 
 		public OrderManager( IEnumerable<OrderSource> sources, string replayFilename )
@@ -157,6 +160,7 @@ namespace OpenRa.Game
 		TcpClient socket;
 
 		Dictionary<int, List<byte[]>> orderBuffers = new Dictionary<int, List<byte[]>>();
+		Dictionary<int, bool> gotEverything = new Dictionary<int, bool>();
 
 		public NetworkOrderSource( TcpClient socket )
 		{
@@ -173,6 +177,10 @@ namespace OpenRa.Game
 					var buf = reader.ReadBytes(len - 4);
 
 					lock (orderBuffers)
+					{
+						if (len == 5 && buf[0] == 0xef)	/* got everything marker */
+							gotEverything[frame] = true;
+						else
 						{
 							/* accumulate this chunk */
 							if (!orderBuffers.ContainsKey(frame))
@@ -181,6 +189,7 @@ namespace OpenRa.Game
 								orderBuffers[frame].Add(buf);
 						}
 					}
+				}
 			} ) { IsBackground = true }.Start();
 		}
 
@@ -193,6 +202,7 @@ namespace OpenRa.Game
 				if (!orderBuffers.TryGetValue(frame, out result))
 					result = NoOrders;
 				orderBuffers.Remove(frame);
+				gotEverything.Remove(frame);
 				return result;
 			}
 		}
@@ -211,7 +221,7 @@ namespace OpenRa.Game
 		public bool IsReadyForFrame( int frameNumber )
 		{
 			lock( orderBuffers )
-				return orderBuffers.ContainsKey( frameNumber );
+				return gotEverything.ContainsKey( frameNumber );
 		}
 	}