sleep seconds ⇒ nil
| seconds | a non-negative real. |
Causes execution to cease and become dormant for approximately the seconds of real time indicated by seconds, whereupon execution is resumed.
(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
Causes processing to pause.
The granularity of the scheduler.
Should signal an error of type type-error if seconds is not a non-negative real.