System.ConsolePal.GetOrCreateReader C# (CSharp) Method

        internal static TextReader GetOrCreateReader()
        {
            Stream inputStream = OpenStandardInput();
            return SyncTextReader.GetSynchronizedTextReader(inputStream == Stream.Null ?
                StreamReader.Null :
                new StreamReader(
                    stream: inputStream,
                    encoding: new ConsoleEncoding(Console.InputEncoding),
                    detectEncodingFromByteOrderMarks: false,
                    bufferSize: DefaultConsoleBufferSize,
                    leaveOpen: true));
        }

                static TextReader EnsureInitialized()
                {
                    // Must be placed outside s_syncObject lock. See Out getter.
                    ConsolePal.EnsureConsoleInitialized();

                    lock (s_syncObject) // Ensures In and InputEncoding are synchronized.
                    {
                        if (s_in == null)
                        {
                            Volatile.Write(ref s_in, ConsolePal.GetOrCreateReader());
                        }
                        return(s_in);
                    }
                }