type
  TDataDeliveryThread = class(TThread)
    private
      FtcpServer: TidTcpServer;
      FdataStack : TStringList;
    public
      constructor Create(tcpServer: TidTcpServer);
      destructor Destroy:
      procedure execute;
      procedure addToStack(s: String);
      
  end;

  procedure TDataDeliveryThread.execute;
  var
    i: Byte;
  begin
    while not terminated do
      begin
        while FdataStack.count > 0 do
          begin
            for i:=0 to Ftcpserver.contexts.lockList.count -1 do
              begin
                (FtcpServer.contexts.lockList[i] as TidContext).connection.IOHandler.writeLn(FdataStack[0]);
             end;
            FdataStack.delete(0);
          end;
        FTcpServer.contexts.unlockList;
        sleep(100);
      end;
  end;