Thread-safe collection for rotating number reading

Question

I'm wondering if there's an inbuilt collection (or any way to make a custom one) in C# that can be used to emit numbers in a rotating/cyclic fashion (see example below), and is thread-safe (so each thread gets the next number in the collection).

Collection with 5 sequential numbers: Thread 1 read: return value 1 Thread 2 read: return value 2 Thread 3 read: return value 3 Thread 4 read: return value 4 Thread 5 read: return value 5 Thread 6 read: return value 1 Thread 7 read: return value 2 Thread 8 read: return value 3 and so on.

Basically, the next number emitted by the collection (when read by a thread) should be one after the previous one, and it should restart from the beginning at the end of the number set.

Answer 1

You can greate a method, that will return infinate enumerable:

    private object _lock = new object();
    private int i = 0;
    private int max = 6;

    public IEnumerable<int> GetNumbers()
    {
        while (true)
        {
            lock (_lock)
            {
                i++;
                if (i == max)
                    i = 1;
                yield return i;
            }
        }

    }

And get them:

var numbers = GetNumbers().Take(1000).ToArray();