mkdirp

    func sleepCtx(ctx context.Context, delay time.Duration) {
        select {
        case <-ctx.Done():
        case <-time.After(delay):
        }
    }

    func main() {
        fmt.Printf("%v\n", time.Now())
        ctx, cancel := context.WithTimeout(context.Background(), 500*time.Millisecond)
        defer cancel()
        sleepCtx(ctx, 1*time.Second)
        fmt.Printf("%v\n", time.Now())
    }