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[racket] Non threadsafe Fortran library (ARPACK) vs Racket 5.3.3

From: Danny Yoo (dyoo at hashcollision.org)
Date: Tue Apr 2 14:49:22 EDT 2013		 
#:in-original-place? should do the trick, as it's what the pango
bindings do as well:

    https://github.com/plt/racket/blob/master/collects/racket/draw/unsafe/pango.rkt#L121-L128


You probably don't need #:atomic?.  #:atomic? has to do with callbacks
from foreign code back into Racket.
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