select {}有什么作用？ [重复]

Question

This question already has an answer here:

• Go project's main goroutine sleep forever? 2 answers

Reading The Go Memory Model, I fell on this code snippet.

var limit = make(chan int, 3)

func main() {
    for _, w := range work {
        go func(w func()) {
            limit <- 1
            w()
            <-limit
        }(w)
    }
    select{}
}

I understand what this function is supposed to do – limit concurrency to 3 goroutines at any time – but I don't understand what the final select{} does. I expect this is some way to keep main alive until all goroutines have finished running, but I can't really say for sure.

What happens in an empty select?

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Answer 1

In generally, select{} is used for infinite loop.