LOCKED
if (atomic_cas_uint(&mutex->lock, UNLOCKED, LOCKED) == UNLOCKED) {
lock = atomic_cas_uint(&mutex->lock, UNLOCKED, LOCKED);
%token INET6 INSTANCE INTERFACE LLADDR LOCAL LOCKED MEMORY NET NIFS OWNER
| LOCKED LLADDR {
| LOCKED { $$ = 1; }
{ "locked", LOCKED },