Coroutines in VS11

Program.cs

using System;
using System.Linq;
using System.Threading.Tasks;

// Target: .NET 4.5 Client (or Full)
// Add a reference to System.Threading.Tasks.Dataflow

class Program
{
    static void Main(string[] args)
    {
        Coroutines.Run(FirstCoroutine, SecondCoroutine, ThirdCoroutine).Wait();
        Console.ReadKey();
    }

    private static class Coroutines
    {
        public static async Task Run(params Func<Task>[] coroutines)
        {
            var factory = new TaskFactory(new ConcurrentExclusiveSchedulerPair().ExclusiveScheduler);
            var coroutineStartTasks = coroutines.Select(factory.StartNew);
            var coroutineCompleteTasks = await Task.WhenAll(coroutineStartTasks);
            await Task.WhenAll(coroutineCompleteTasks);
        }
    }

    private static async Task FirstCoroutine()
    {
        Console.WriteLine("Starting FirstCoroutine");
        Console.WriteLine("Yielding from FirstCoroutine...");

        await Task.Yield();

        Console.WriteLine("Returned to FirstCoroutine");
        Console.WriteLine("Yielding from FirstCoroutine again...");

        await Task.Yield();

        Console.WriteLine("Returned to FirstCoroutine again");
        Console.WriteLine("Finished FirstCoroutine");
    }

    private static async Task SecondCoroutine()
    {
        Console.WriteLine("  Starting SecondCoroutine");
        Console.WriteLine("  Yielding from SecondCoroutine...");

        await Task.Yield();

        Console.WriteLine("  Returned to SecondCoroutine");
        Console.WriteLine("  Yielding from SecondCoroutine again...");

        await Task.Yield();

        Console.WriteLine("  Returned to SecondCoroutine again");
        Console.WriteLine("  Finished SecondCoroutine");
    }

    private static async Task ThirdCoroutine()
    {
        Console.WriteLine("    Starting ThirdCoroutine");
        Console.WriteLine("    Yielding from ThirdCoroutine...");

        await Task.Yield();

        Console.WriteLine("    Returned to ThirdCoroutine");
        Console.WriteLine("    Finished ThirdCoroutine");
    }
}