C# - Windows / Linux 환경에서 Native Thread ID 가져오기

.NET Framework 시절에는 AppDomain.GetCurrentThreadId로도 구할 수 있었지만,

C# - 런타임 환경에 따라 달라진 AppDomain.GetCurrentThreadId 메서드
; https://www.sysnet.pe.kr/2/0/13024

using System.Runtime.InteropServices;

public enum LinuxSysCall
{
    __NR_gettid = 186,
}

internal class Program
{
    [DllImport("kernel32.dll")]
    public static extern uint GetCurrentThreadId();

    [DllImport("libc.so.6")]
    public static extern int syscall(int callNumber, IntPtr data);

    public static uint GetThreadNativeId()
    {
        if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
        {
            return GetCurrentThreadId();
        }
        else if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
        {
            return (uint)syscall((int)LinuxSysCall.__NR_gettid, IntPtr.Zero);
        }

        return 0;
    }

    static void Main(string[] args)
    {
        Console.WriteLine($"CurrentThreadId: {GetThreadNativeId()}");

        ThreadPool.QueueUserWorkItem((arg) =>
        {
            uint thread_id = GetThreadNativeId();
            Console.WriteLine($"{Environment.ProcessId}, {thread_id}, {Thread.CurrentThread.Name}");
        });

        Thread.Sleep(1000);
    }
}

[DllImport("libc.so.6")]
public static extern int gettid();