Function lf_blocks

freebsd/kern/kern_lockf.c:858–865

* Return non-zero if lock 'x' is blocked by lock 'y' (or vice versa). */

 * Return non-zero if lock 'x' is blocked by lock 'y' (or vice versa).
 */
static int
lf_blocks(struct lockf_entry *x, struct lockf_entry *y)
{

	return x->lf_owner != y->lf_owner
		&& (x->lf_type == F_WRLCK || y->lf_type == F_WRLCK)
		&& lf_overlaps(x, y);
}

/*
 * Allocate a lock edge from the free list