Using a channel to wait for a single goroutine to finish in Golang

package main

import (
	"fmt"
	"time"
)

func main() {
	ch := make(chan bool)

	go paint(ch)

	// Acquire lock by waiting for channel to send something.
	<- ch

	fmt.Println("done")
}

func paint(ch chan <- bool) {
	fmt.Println("started painting")

	time.Sleep(2 * time.Second)

	fmt.Println("finished painting")

	// Instruct to release lock by sending a message.
	ch <- true
}

started painting
finished painting
done