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Syntax:
sleep seconds => nil
Arguments and Values:
seconds---a non-negative real.
Description:
Causes execution to cease and become dormant for approximately the seconds of real time indicated by seconds, whereupon execution is resumed.
Examples:
 (sleep 1) =>  NIL 
;; Actually, since SLEEP is permitted to use approximate timing, 
;; this might not always yield true, but it will often enough that
;; we felt it to be a productive example of the intent.
 (let ((then (get-universal-time))
       (now  (progn (sleep 10) (get-universal-time))))
   (>= (- now then) 10))
=>  true
 
Side Effects:
Causes processing to pause.
Affected By:
The granularity of the scheduler.
Exceptional Situations:
Should signal an error of type type-error if seconds is not a non-negative real.
See Also: None.
Notes: None.
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