Sending a channel over a channel

chan-over-chan.go

package main

import (
	"log"
	"time"
)

type acker struct {
	ch chan time.Duration
}

func doStuff(t time.Duration, ch <-chan acker) {
	ac := <-ch
	time.Sleep(t)
	ac.ch <- t
}

func main() {
	ch := make(chan acker)
	for i := 0; i < 10; i++ {
		go doStuff(time.Duration(i+1)*time.Second, ch)
	}
	thinger := acker{ch: make(chan time.Duration)}
	for i := 0; i < 10; i++ {
		ch <- thinger
	}
	for i := 0; i < 10; i++ {
		dur := <-thinger.ch
		log.Printf("thinger slept for %s", dur)
	}
}