golang 缓冲chan学习及使用

func main() {
    bools := make(chan bool, 3)
    chanstrings := make(chan string, 1)
    for i := 0; i < 100; i++ {
        bools <- true
        go func(i int) {
            time.Sleep(2 * time.Second)
            log.Println(time.Now(), i)
            <-bools
        }(i)
        if i == 99 {
            chanstrings <- ""
        }
    }
    <-chanstrings
}