sys/kern/vfs_vnops.c

761 	volatile short *flagsp;
774 	flagsp = &fp->f_vnread_flags;
775 	if (atomic_cmpset_acq_16(flagsp, 0, FOFFSET_LOCKED))
779 	state = atomic_load_16(flagsp);
782 			if (!atomic_fcmpset_acq_16(flagsp, &state,
788 			if (!atomic_fcmpset_acq_16(flagsp, &state,
797 		state = atomic_load_16(flagsp);
807 	volatile short *flagsp;
822 	flagsp = &fp->f_vnread_flags;
823 	state = atomic_load_16(flagsp);
825 	    atomic_cmpset_rel_16(flagsp, state, 0))