go thread select chan

selectchan.go

package main

import (
	"fmt"
	"time"
)

func main() {
// first chan to return executes
	select {
	case v := <-streamer(3):
		fmt.Println(v, "chan 1")
	case v1 := <-streamer(5):
		fmt.Println(v1, "chan 2")
	}

}

func streamer(sec int) chan int {
	ret := make(chan int)
	go func() {
		time.Sleep(time.Duration(sec) * time.Second)
		ret <- 3
	}()
	return ret
}