Buffered channel in golang

go_buffered_channel.go

package main

import (
	"fmt"
	"math/rand"
	"time"
)

func main() {
	chArr := make(chan int64, 10)

	for i := 0; i < 10; i++ {
		go func(ch chan int64) {
			randInt := rand.Intn(3)
			start := time.Now().Unix()
			time.Sleep(time.Duration(randInt) * time.Second)
			fmt.Printf("sleep %d ,start %d,after sleep %d\n", randInt, start, time.Now().Unix())
			ch <- time.Now().Unix()
		}(chArr)
	}

	timeout := time.After(5 * time.Second)
	for {
		select {
		case timeArr := <-chArr:
			fmt.Printf("ch val is %d\n", timeArr)
		case <-timeout:
			fmt.Print("timeout\n")
			return
		}
	}

}