read 1byte and increment from MappedMemoryFile in C#

main.cs

using System;
using System.IO;
using System.IO.MemoryMappedFiles;
using System.Runtime.InteropServices;

public class HelloWorld
{
    static public void Main ()
    {
        string MappedMemoryFileName = "/tmp/mmf";
        using (var mmf = MemoryMappedFile.CreateFromFile(MappedMemoryFileName, FileMode.OpenOrCreate, MappedMemoryFileName))
        {
            int cur_loc = 0;
            int prev_loc = 0;
            int pivot = Convert.ToInt32(cur_loc ^ prev_loc);
            // start: pivot, size: 1
            using (var accessor = mmf.CreateViewAccessor(pivot, 1))
            {
                // start position: 0
                var result = accessor.ReadByte(0);
                Console.WriteLine("NUMBER: " + result);
                result += 1;
                accessor.Write(0, ref result);
            }
        }
        
    }
}

ref

• https://www.dotnetperls.com/memorymappedfile
• https://learn.microsoft.com/ja-jp/dotnet/api/system.io.memorymappedfiles.memorymappedfile.createviewaccessor?view=net-6.0