golang sync.Mutex(2)

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package mainimport (    "fmt"    "sync"    "time")type User struct {    Name   string    Locker *sync.Mutex}func (u *User) SetName(wati *sync.WaitGroup, name string) {    defer func() {        fmt.Println("Unlock set name:", name)        u.Locker.Unlock()        wati.Done()    }()    u.Locker.Lock()    fmt.Println("Lock set name:", name)    time.Sleep(1 * time.Second)    u.Name = name}func (u *User) GetName(wati *sync.WaitGroup) {    defer func() {        fmt.Println("Unlock get name:", u.Name)        u.Locker.Unlock()        wati.Done()    }()    u.Locker.Lock()    fmt.Println("Lock get name:", u.Name)    time.Sleep(1 * time.Second)}func main() {    user := User{}    user.Locker = new(sync.Mutex)    wait := &sync.WaitGroup{}    names := []string{"a", "b", "c"}    for _, name := range names {        wait.Add(2)        go user.SetName(wait, name)        go user.GetName(wait)    }    wait.Wait()}

轉自：http://www.liguosong.com/2014/05/07/golang-sync-mutex/