Semaphores golang example

Evar (
    concurrent    = 5
    semaphoreChan = make(chan struct{}, concurrent)
)

func doWork(item int) {
    semaphoreChan <- struct{}{} // block while full
    go func() {
        defer func() {
            <-semaphoreChan // read to release a slot
        }()
        log.Println(item)
        time.Sleep(1 * time.Second)
    }()
}

func main() {
    for i := 0; i < 10000; i++ {
        doWork(i)
    }
}