Creating a deadlock example C# Exam 70-483: error?

Question

I have the book
Exam Ref 70-483 Programming in C#.
Listing 1-37(Page 33) shows an example of a deadlock.
public class Program
static void Main(string[] args)
object lockA = new object();
object lockB = new object();
var up = Task.Run(() =>
lock (lockA)
Thread.Sleep(1000);
lock (lockB)
Console.WriteLine("Locked A and B");
lock (lockB)
lock (lockA)
Console.WriteLine("Locked B and A");
up.Wait();
In the paragraph, it says: Because both locks are taken in reverse order, a deadlock occurs. The first
Task locks A and waits for B to become free. The main thread, however, has B locked and is waiting for A to be released.
However I tried the code, there was no deadlock at all.
Anything wrong?

Answer 1

You didn't get any deadlock because the main thread completed before the secondary thread had the time to take its first lock. If you want to see the deadlock, add a Thread.Sleep(1000) in the main thread after taking the lock on lockB (in the same way
that the secondary thread does a Sleep after taking lockA).