限制为Golang可执行文件的单个实例

Question

I need to only allow one instance of my Golang executable at a time. I'm not sure how to use a Global Mutex to make sure no other instances are running.

This would be running on a Windows Machine.

Answer 1

I know this topic is a bit old, but I needed it recently on Windows and I'll post here how I did it in case someone else needs.

Thx to @VonC for pointing me in the right direction.

var (
    kernel32        = syscall.NewLazyDLL("kernel32.dll")
    procCreateMutex = kernel32.NewProc("CreateMutexW")
)

func CreateMutex(name string) (uintptr, error) {
    ret, _, err := procCreateMutex.Call(
        0,
        0,
        uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(name))),
    )
    switch int(err.(syscall.Errno)) {
    case 0:
        return ret, nil
    default:
        return ret, err
    }
}

// mutexName starting with "Global\" will work across all user sessions
_, err := CreateMutex("SomeMutexName")

I created a lib with a more complete example: https://github.com/rodolfoag/gow32

Thx!