redigo subscribe routine 如何被通知优雅退出？

如下代码，死循环的go程怎么退出呢？

package main

import (
    "fmt"

    "github.com/garyburd/redigo/redis"
)

func subscribe() int {
    c, _ := redis.Dial("tcp", "127.0.0.1:6379")
    psc := redis.PubSubConn{c}
    psc.Subscribe("subs_key")
    for {
        switch v := psc.Receive().(type) {
        case redis.Message:
            fmt.Printf("chan %v, data=%v\n", v.Channel, v.Data)
        case redis.Subscription:
        case error:
        }
    }
}

func main() {
    go subscribe()
}