如何在不产生死锁的情况下拥有一个缓冲通道和多个读取器？

FATAL Error All go routines are asleep. Deadlock.

This is what I tried. I am calling wg.Done(). What is missing?

package main

import (
    "fmt"
    "strconv"
    "sync"
)

func sender(wg *sync.WaitGroup, cs chan int) {
    defer wg.Done()
    for i := 0; i < 2; i++ {
        fmt.Println(i)
        cs <- i
    }
}

func reciever(wg *sync.WaitGroup, cs chan int) {
    x, ok := <-cs
    for ok {
        fmt.Println("Retrieved" + strconv.Itoa(x))
        x, ok = <-cs
        if !ok {
            wg.Done()
            break
        }
    }
}

func main() {
    wg := &sync.WaitGroup{}
    cs := make(chan int, 1000)
    wg.Add(1)
    go sender(wg, cs)
    for i := 1; i < 30; i++ {
        wg.Add(1)
        go reciever(wg, cs)
    }
    wg.Wait()
    close(cs)
}