【求助】golang filelock不互斥问题

package main import ( "fmt" "sync" "os" "time" "golang.org/x/sys/unix" ) func main() { file, err := os.Open("/home/testfile") if err != nil { fmt.Println("create failed") return } defer file.Close() if err = unix.Flock(int(file.Fd()), unix.LOCK_EX); err != nil { fmt.Println("flock failed 2") } wg := sync.WaitGroup{} wg.Add(2) go func() { if err = unix.Flock(int(file.Fd()), unix.LOCK_EX); err != nil { fmt.Println("flock faild 3") } fmt.Println("lock success") time.Sleep(3*time.Second) wg.Done() }() go func() { if err = unix.Flock(int(file.Fd()), unix.LOCK_EX); err != nil { fmt.Println("flock faild 3") } fmt.Println("lock success") time.Sleep(time.Second) wg.Done() }() wg.Wait() return } 按照书上说应该会互斥，为啥我运行的时候flock无法做到互斥，每个goroutine就能很快正常执行？