A cancellable synchronous Sleep implementation

Sleeper.cs

using System;
using System.Threading;

namespace Utils.Threading
{
    /// <summary>
    /// A cancellable replacement for Thread.Sleep
    /// </summary>
    public static class Sleeper
    {
        public static void Sleep(int millisecondsTimeout, CancellationToken cancellationToken = default(CancellationToken))
        {
            Sleep(TimeSpan.FromMilliseconds(millisecondsTimeout), cancellationToken);
        }

        public static void Sleep(TimeSpan timeout, CancellationToken cancellationToken = default(CancellationToken))
        {
            var mre = new ManualResetEvent(false);
            var registration = default(CancellationTokenRegistration);
            if (cancellationToken.CanBeCanceled)
                registration = cancellationToken.Register(() => mre.Set());
            mre.WaitOne(timeout);
            registration.Dispose();
        }
    }
}

• Thread.Sleep doesn't accept a CancellationToken, so it can't be interrupted
• Task.Delay accepts a CancellationToken, but it's only available since .NET 4.5, and it's asynchronous, which is not always practical

Sleeper.Sleep combines the features of those two methods: it is synchronous and cancellable.