clojure: How do I use while/loop with sleep

Question

I want to call a function every second.

I have the following code:

(defn dostuff []
  (do
    (print "I'm doing stuff")
    ...))

(while true
  (Thread/sleep 1000)
  (dostuff))

I would expect this to print "I'm doing stuff" every second but it does not.

How do I achieve this?

You are calling print instead of println. It doesn't auto-flush. — Marko Topolnik
– Marko Topolnik, Commented May 23, 2014 at 17:27

Diego Basch · Accepted Answer · 2014-05-23 18:45:40Z

4

You're not flushing stdout. You can either use println, which is print plus newline (forces auto-flush), or explicitly call flush like this:

(defn dostuff []
  (do
    ...
    (print "I'm doing stuff")
    (flush)))

answered May 23, 2014 at 18:45

Diego Basch

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