File: observer

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newlisp 10.7.5-2
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#!/usr/bin/env newlisp

(define (count-down-proc x channel)
  (while (!= x 0)
      (write-line channel (string x))
      (dec x)))

(define (observer-proc channel)
  (do-until (= i "1")
    (println "process " (setq i (read-line channel)))))

(map set '(in out) (pipe))
(set 'observer (fork (observer-proc in)))
(set 'counter (fork (count-down-proc 5 out)))

; avoid zombies
(wait-pid observer)
(wait-pid counter)

(exit)