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ANSI Common Lisp  25 Environment 25.2 Dictionary of Environment
- 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.
- Allegro CL Implementation Details:
-
None.
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