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()

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.

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