Simple Gorotine test using WaitGroup

goro_ex_wg.go

package main

import (
        "fmt"
        "time"
        "rand"
        "sync"
        "runtime"
)

func main() {
    runtime.GOMAXPROCS(4)
    wg := &sync.WaitGroup{}
    times := 26
    wg.Add(times)
    for i := 0; i < times; i++ {
        go func(x int) {
            time.Sleep(4e9)
            fmt.Printf("%c ", x+65)
            wg.Done()
        }(i)
    }
    wg.Wait()
}