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package main
import (
"fmt"
"sync"
"time"
)
func main() {
wg := &sync.WaitGroup{}
limiter := make(chan bool, 10)
for i := 0; i < 100; i++ {
wg.Add(1)
limiter <- true
go download(i, limiter, wg)
}
wg.Wait()
}
func download(index int, limiter chan bool, wg *sync.WaitGroup) {
defer wg.Done()
fmt.Println("start to download :", index)
time.Sleep(1 * time.Second)
<-limiter
}