Waiting for goroutines

yourbasic.org/golang

A sync.WaitGroup waits for a group of goroutines to finish.

var wg sync.WaitGroup wg.Add(2) go func() { // Do work.	wg.Done() }() go func() { // Do work.	wg.Done() }() wg.Wait()

First the main goroutine calls Add to set the number of goroutines to wait for.
Then two new goroutines run and call Done when finished.

At the same time, Wait is used to block until these two goroutines have finished.

Note: A WaitGroup must not be copied after first use.