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Well, there's no Sleep on earth long enough to guarantee 
that some other specific thread got a timeslice, so maybe 
that's the best that can be done.

I'm not sure what you mean when you say that the main 
thread sees KeyboardInterrupt on Linux.  In sleeper.py?  I 
expect the main thread to be hung, waiting to acquire a 
lock that will never be released (when a thread in 
sleeper.py is killed via IOError, it never releases its lock, 
and the main thread should hang trying to acquire it).  A 
lock.acquire() shouldn't be interruptible by Ctrl+C, so 
there's a Linux bug here if the main thread isn't hung.

Anyway, that's irrelevant to this patch, so Accepted and 
back to you.  Reformat so that lines don't go beyond 
column 79?  Also please write some Misc/NEWS blurbs for 
the things you checked in today.  Thanks!