Does ManualResetEvent work in the Unity runtime?

The following code fragment should hang the calling thread forever:

 using System.Threading;
 
 ManualResetEvent done = new ManualResetEvent(false);
 done.WaitOne();

But when I run the code the thread does not hang on done.WaitOne() as I would expect.

I'm running under the Unity editor 4.2.2f1 on Windows 7.