What part of the System.Threading class is supported by Unity 4.2 on PC/Mac/Linux?

Hello,

I am currently working on some multithreaded tasks, and experience strange behavior with some of the objects/methods in the System.Threading class (e.g. Semaphores being skipped although WaitOne(-1) should wait indefinitely), and, more important, different behavior on different platforms (Windows, Mac and Linux). Before going into the details of my problem, I first wanted to ask if there exists any list of what features of the System.Threading class are supported on what platforms, and especially what features are safe to be used in a cross platform project and can be expected to work the same way on Windows, Mac OS X and Linux.

Thank you!

Tobias