maximum entropy <entropy@zippy.bernstein.com>  wrote:
 > Would it be particularly difficult to implement the actual locking?
 > I'm just wondering why it hasn't been done...is there a technical
 > reason, or is it just because no one has volunteered to write the code?

I thought somewhere along the way, someone (Henry Spencer?) had 
proven logically or algorithmically that it was impossible to 
implement correctly.