直接上代码, LockFile可以获得一个文件的独占权, 或阻塞等待

linux

func LockFile(file *os.File) error {
    return syscall.Flock(int(file.Fd()), syscall.LOCK_EX)
}

windows

func LockFile(file *os.File) error {
    h, err := syscall.LoadLibrary("kernel32.dll")
    if err != nil {
        return err
    }
    defer syscall.FreeLibrary(h)

    addr, err := syscall.GetProcAddress(h, "LockFile")
    if err != nil {
        return err
    }
    for {
        r0, _, _ := syscall.Syscall6(addr, 5, file.Fd(), 0, 0, 0, 1, 0)
        if 0 != int(r0) {
            break
        }
        time.Sleep(100 * time.Millisecond)
    }
    return nil
}