英文:
What does select{} do?
问题
阅读《Go内存模型》时，我遇到了这段代码。
var limit = make(chan int, 3)
func main() {
for _, w := range work {
go func(w func()) {
limit <- 1
w()
<-limit
}(w)
}
select{}
}
我理解这个函数的作用是限制并发性，最多同时运行3个goroutine，但我不明白最后的select{}是什么意思。我猜想这是一种方式，可以使main函数保持活动状态，直到所有的goroutine都运行完毕，但我不能确定。
在空的select中会发生什么？
英文:
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?
答案1
得分: 2
通常情况下，select{}用于创建无限循环。
英文:
In generally, select{} is used for infinite loop.
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