ipc_relock
lock = ipc_relock(msq_svc, qp->msg_perm.ipc_id, lock);
*lock = ipc_relock(msq_svc, qp->msg_perm.ipc_id, *lock);
kmutex_t *ipc_relock(ipc_service_t *, int, kmutex_t *);
lock = ipc_relock(sem_svc, sp->sem_perm.ipc_id, lock);
lock = ipc_relock(sem_svc, sp->sem_perm.ipc_id, lock);