using System;
using System.Threading;
using System.Threading.Tasks;

class Program
{
    private static object syncObject = new object();
    private static void Write()
    {
        lock (syncObject)
        {
        	Console.WriteLine(Thread.CurrentThread.ManagedThreadId);
            Console.WriteLine("test");
        }
    }

    static void Main(string[] args)
    {
        lock (syncObject)
        {
        	Console.WriteLine(Thread.CurrentThread.ManagedThreadId);
            Task.Run(() => Write());
            Thread.Sleep(3000);
        }
    }
}