golang--监控goroutine异常退出

package main

import (
    "log"
    "runtime"
    "math/rand"
    "time"
)

type message struct {
    normal bool //true means exit normal, otherwise
    state map[string]interface{} //goroutine state
}

func main() {
    runtime.GOMAXPROCS(runtime.NumCPU())
    mess := make(chan message, 10)
    for i := 0; i < 100; i   {
        go worker(mess)
    }
    supervisor(mess)
}

func worker(mess chan message) {
    defer func() {
        exit_message := message{state:make(map[string] interface{})}
        i := recover()
        if i != nil {
            exit_message.normal = false
        } else {
            exit_message.normal = true
        }
        mess <- exit_message
    }()
    now := time.Now()
    seed := now.UnixNano()
    rand.Seed(seed)
    num := rand.Int63()
    if num % 2 != 0 {
        panic("not evening")
    } else {
        runtime.Goexit()
    }
}


func supervisor(mess chan message) {
    for i := 0; i < 100; i   {
        m := <- mess 
        switch m.normal {
        case true :
            log.Println("exit normal, nothing serious!")
        case false:
            log.Println("exit abnormal, something went wrong")
        }

    }
}