lock

err := Create("my_app")

if err != nil {
	panic(err.Error())
}

// do some stuff

err = Remove("my_app")

if err != nil {
	panic(err.Error())
}

Output:

if Has("my_app") {
	panic("Can't start application due to lock file")
}

Output:

if Has("my_app") {
	if IsExpired("my_app", time.Hour) {
		// looks like lock file was created long time ago, so delete it
		Remove("my_app")
	} else {
		panic("Can't start application due to lock file")
	}
}

Output:

err := Create("my_app")

if err != nil {
	panic(err.Error())
}

// do your stuff

err = Remove("my_app")

if err != nil {
	panic(err.Error())
}

Output:

ok := Wait("my_app", time.Now().Add(time.Minute))

if !ok {
	panic("Can't start application due to lock file")
}

// do your stuff

Output: