测试

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package main   import (     "errors"     "fmt"     "sync"     "time" )   type Element struct {     V    int     Pre  *Element     Next *Element }   type List struct {     Len  int     Head *Element     Tail *Element     m    sync.RWMutex }   func (l *List) Push(v int) {     l.m.Lock()     defer l.m.Unlock()     e := &Element{V: v}     if l.Head == nil {         l.Head = e     } else {         l.Tail.Next = e         e.Pre = l.Tail       }     l.Tail = e     l.Len = l.Len + 1 }   var errEmpty = errors.New("空了!")   func (l *List) Pop() (v int, err error) {     l.m.Lock()     defer l.m.Unlock()       if l.Tail == nil {         err = errEmpty     } else {         v = l.Tail.V         l.Tail = l.Tail.Pre         if l.Tail == nil {             l.Head = nil         }         l.Len = l.Len - 1     }     return v, err } func main() {       list := new(List)     /*  for i := 0; i < 10; i++ {             list.Push(i)         }     */     go list.Push(1)     go list.Push(2)     go list.Push(3)     go list.Push(4)     go list.Push(5)       time.Sleep(time.Second * 2)     fmt.Println("qian:", list)       for v, err := list.Pop(); err == nil; v, err = list.Pop() {         fmt.Printf("%v\n", v)     }     fmt.Println("hou:", list)   }