Quickduck

Here’s a little question about Threading – this would be a great interview question, in my opinion!

Given the code below:

public class Producer
{
    [ThreadStatic]
    readonly static private Producer _instance = new Producer();

    static private int _instanceCount;
    readonly private int _instanceId;

    private Producer()
    {
        _instanceId = ++_instanceCount;
    }

    static public Producer Instance
    {
        get { return _instance; }
    }

    public string Name
    {
        get
        {
            return String.Format("Instance {0} of {1}",
                _instanceId, _instanceCount);
        }
    }
}

public class Consumer
{
    public Consumer()
    {
        Thread t1 = new Thread(IdentifyProducer);
        t1.Start();

        Thread t2 = new Thread(IdentifyProducer);
        t2.Start();

        t1.Join();
        t2.Join();
    }

    public void IdentifyProducer()
    {
        Console.WriteLine(Producer.Instance.Name);
    }
}

What will happen when you create a new instance of the Consumer class?