that traditional OSes hold back the more sophisticated (as in, far from 
machine language) languages.

http://www.artima.com/lejava/articles/azul_pauseless_gc.html

Traditional file system interfaces probably do too. For example, if you 
wanted something like a virus scanner that was watching your executables, I 
suspect that "scan the file when it gets passed to exec()" is probably a 
much more common implementation than "scan each block between the time it is 
paged in and the time the code branches to it", for example.  (Indeed, I 
don't know how you'd even do that latter on Linux or Windows or whatever.)

It's interesting that this sort of stuff is starting to get to the point 
where people will be willing to break with compatibility at some level. 
Phones, game consoles, set-top boxes, and eventually probably "enterprise" 
or "cloud" type servers will all be willing to consider a different 
operating system that puts limits on compatibility with previous languages 
and libraries.

-- 
Darren New, San Diego CA, USA (PST)
   Serving Suggestion:
     "Don't serve this any more. It's awful."

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