const runtime.mutex_locked

3 uses

	runtime (current package)
		lock_futex.go#L27: 	mutex_locked   = 1
		lock_futex.go#L48: 	return atomic.Load(key32(&l.key)) > mutex_locked
		lock_futex.go#L64: 	v := atomic.Xchg(key32(&l.key), mutex_locked)