channel问题思考

先看代码

package main
import (
    "strings"
    "fmt"
    "time"
)



func main()  {

    users:=strings.Split("shenyi,zhangsan,lisi,wangwu",",")
    ages:=strings.Split("19,21,25,26",",")

    c1,c2:=make(chan bool),make(chan bool)
    ret:=make([]string,0)
    go func() {
        for _,v:=range users{
             <-c1
             ret=append(ret,v)
             time.Sleep(time.Second)
             c2<-true
        }
    }()
    go func() {
        for _,v:=range ages{
            <-c2
            ret=append(ret,v)
            c1<-true
        }
    }()
    c1<-true
    fmt.Println(ret)


}

打印：

[shenyi]