package main

import "time"

import "fmt"

func main() {

    control := make(chan interface{}, )

    for i := ; i <= ; i++ {

        control <- i //这里应该放上面,如果放下面就会每次都执行三个了

        go func(j int) {

            fmt.Printf("go func: %d, time: %d\n", j, time.Now().Unix())

            time.Sleep(time.Second)

            <-control

        }(i)

    }

    //主groutine不要断

    for {

        time.Sleep(time.Second)

    }

}

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