list操作崩溃

DataList在多个goroutine里同时被读写，存在数据竞争，需要做线程同步。

package main

import (
    "container/list"
    "fmt"
    "sync"
    "time"
)

var Ch = make(chan int)
var DataList = list.New()
var mutex sync.Mutex

func ReadChan() {
    for {
        data := <-Ch
        fmt.Println(data)
    }
}

func WriteChan() {
    for {
        mutex.Lock()
        if size := DataList.Len(); size > 0 {
            data := DataList.Front()
            if data.Value != nil {
                Ch <- data.Value.(int)
                DataList.Remove(data)
            }
            mutex.Unlock()
        } else {
            mutex.Unlock()
            time.Sleep(100 * time.Millisecond)
        }
    }
}

func feed() {
    for {
        for i := 0; i < 20; i++ {
            mutex.Lock()
            DataList.PushBack(i)
            mutex.Unlock()
        }
        time.Sleep(150 * time.Millisecond)
    }
}

func main() {

    go WriteChan()
    for i := 0; i < 5; i++ {
        go ReadChan()
    }
    feed()
}

谢谢！确实少了上锁