Looking to trigger the end of a loop by the creation of a file.
Is this possible? Is this advisable?
Currently using: 
a 'for' loop with
a 'for' loop guard expression to test for the existence of a file.
Tried file-exists? but that does not seem appropriate.
Tried using Racket function: filesystem-change-evt but that did not seem 
appropriate.
Is it possible to trigger an end condition on a 'for' loop by the creation 
of a file?
I suspect my problem is that it takes a significant amount of time for the 
operating system to register the creation of a file.
So maybe the best that can be done is to use file-exists? as it works but 
there a many loops of the 'for' loop before the end condition takes effect.
Any comments?

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