Function PredicateLockPage

src/backend/storage/lmgr/predicate.c:2591–2604

* PredicateLockPage * * Gets a predicate lock at the page level. * Skip if not in full serializable transaction isolation level. * Skip if this is a temporary table. * Skip if a coarser predicate lock already covers this page. * Clear any finer-grained predicate locks this session has on the relation. */

 * Clear any finer-grained predicate locks this session has on the relation.
 */
void
PredicateLockPage(Relation relation, BlockNumber blkno, Snapshot snapshot)
{
	PREDICATELOCKTARGETTAG tag;

	if (!SerializationNeededForRead(relation, snapshot))
		return;

	SET_PREDICATELOCKTARGETTAG_PAGE(tag,
									relation->rd_node.dbNode,
									relation->rd_id,
									blkno);
	PredicateLockAcquire(&tag);
}

/*
 *		PredicateLockTID