trylock uses unsafe, which is sorta "unsafe", but should work until sync.Mutex will change its layout (I hope it never will).

Usage

type LockedStruct struct {
	mu trylock.Mutex
}

storage := &LockedStruct{}

if storage.mu.TryLock() {
	// do something with storage
} else {
	// return busy or use some logic for unavailable storage
}