Hi, I submitted this patch a few days ago, and unfortunately have been busy to reply, but now it's Friday :). <snip> Patches item #1744382, was opened at 2007-06-27 20:08 Message generated for change (Comment added) made by loewis You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=305470&aid=1744382&group_id=5470 <snip> The patch is unacceptable in its current form: - it should be provided as a patch to threading.py, not as a separate module - it should have a name that follows "the convention", which seems to be that it should have "reader" and "writer" in its name (or "rw"). See how C# and Java do it (and other libraries you can find that provide such a mechanism) - it needs documentation - it needs tests. <snip> I can do the other three parts, but I am wondering, how do I write a deterministic test unit for my patch? How is it done with the threading model in python in general? Cheers, Yaakov