Untitled

using System;
using System.Threading;

class Program {
    static int winner = 0;
    static void Main(string[] args) {
        Thread t1 = new Thread(RunRace);
        Thread t2 = new Thread(RunRace);
        t1.Start("Thread 1");
        t2.Start("Thread 2");
        t1.Join();
        t2.Join();
        Console.WriteLine("Winner: " + winner);
        Console.ReadLine();
    }

    static void RunRace(object threadName) {
        for (int i = 0; i < 10; i++) {
            Console.WriteLine(threadName + " is at position " + i);
            Thread.Sleep(100);
            if (i == 9 && Interlocked.CompareExchange(ref winner, 1, 0) == 0) {
                Console.WriteLine(threadName + " wins the race!");
            }
        }
    }
}