SpinWait.SpinUntil lock test

SpinUntilLockTest.cs

var flag = 0;
var stopwatch = new Stopwatch();

ParameterizedThreadStart task = p => {
	SpinWait.SpinUntil(() => Interlocked.CompareExchange(ref flag, 1, 0) == 0);
	Console.WriteLine($"[{stopwatch.Elapsed}] Thread {p} has entered lock.");
	Thread.Sleep(2000);
	Console.WriteLine($"[{stopwatch.Elapsed}] Thread {p} is exiting lock.");
	Interlocked.Exchange(ref flag, 0);
};

var thread1 = new Thread(task);
var thread2 = new Thread(task);

stopwatch.Start();
thread1.Start(1);
thread2.Start(2);

thread1.Join();
thread2.Join();