问使用sync.Cond的Golang偶数奇数打印变量

EN

package main

import (
    "fmt"
    "sync"
    "time"
)

var done bool

func odd(name *int, c *sync.Cond) {
    //fmt.Println(*name, "ODD ")
    if *name >= 9 {
        return
    }
    c.L.Lock()
    for !done {
        c.Wait()
    }
    *name++
    done = false
    fmt.Println(*name, "ODD")
    c.L.Unlock()
    c.Signal()
}

func even(name *int, c *sync.Cond) {

    //fmt.Println(*name, "EVEN ")
    if *name >= 9 {
        return
    }
    c.L.Lock()
    for done == true {
        c.Wait()
    }
    done = true
    *name++
    fmt.Println(*name, "EVEN ")
    c.L.Unlock()
    c.Signal()
}

func main() {
    done = false

    cond := sync.NewCond(&sync.Mutex{})
    val := 0
    for val < 10 {
        go odd(&val, cond)
        go even(&val, cond)
    }
    time.Sleep(10 * time.Second)
    fmt.Println("val final:=  ", val)
}