Question

static int i = 0;

static void Main()
{
    ThreadTest tt = new ThreadTest();
    new Thread(tt.Incr).Start();
    tt.I();
    tt.I2();
}

void Incr()
{
    for(int x = 0; x < 3; x++)
    {
        Console.WriteLine(i);
        i++;
    }
}

void I()
{
    while(i <= 3)
    {
        if(i==3)
            break;
        Console.WriteLine("Value of i in I:{0}",i);
    }
}

void I2()
{
    Console.WriteLine("\t\tFinally i is:{0}\n\n",i);
}

I have run this piece of code about a few hundred times now and find that I2 always executes last. Why does this happen? May be a few hundred times is not enough to see the true unpredictability of threads?

Output of 11 runs

Answer 1

Well, I2() is the last method in Main() and it is not threaded in any way.

So what’s the question, why the thread finishes earlier?

That’s because I2() is run after I() and the while-loop in I() effectively waits for the thread to finish first.