current-time in a loop

current-time in a loop

[PT]

current-time returns a list (HIGH LOW MICROSEC)

If I run it from a loop and leave it running for a few seconds only the
last element is incremented according to the output in the Messages
buffer:

(while t
  (princ (current-time))
  (princ "\n"))


(17304 15330 601809)
(17304 15330 601836)
(17304 15330 601863)
(17304 15330 601889)
(17304 15330 601916)


Why is that?

Re: current-time in a loop

[Anselm Helbig]

hi pt!

At 8 Dec 2005 06:01:18 -0800,
PT wrote:
> 
> current-time returns a list (HIGH LOW MICROSEC)
> 
> If I run it from a loop and leave it running for a few seconds only the
> last element is incremented according to the output in the Messages
> buffer:
> 
> (while t
>   (princ (current-time))
>   (princ "\n"))
> 
> 
> (17304 15330 601809)
> (17304 15330 601836)
> (17304 15330 601863)
> (17304 15330 601889)
> (17304 15330 601916)
> 
> 
> Why is that?

that's because emacs is so blindingly fast. 8;-) do a 

(while t
  (princ (current-time))
  (sit-for 1)
  (princ "\n"))

and you will see the seconds incrementing. i guess, the printing takes
more time than the loop, and the output is buffered in a way... 

regards, 

anselm