sleep

sleep Function

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.

Expanded Reference: sleep

tip

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(sleep )