diff options
Diffstat (limited to 'src/include/utils/rel.h')
| -rw-r--r-- | src/include/utils/rel.h | 29 |
1 files changed, 20 insertions, 9 deletions
diff --git a/src/include/utils/rel.h b/src/include/utils/rel.h index 481cdb2465f..7f0c1351bd6 100644 --- a/src/include/utils/rel.h +++ b/src/include/utils/rel.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/utils/rel.h,v 1.76 2004/07/17 03:31:47 tgl Exp $ + * $PostgreSQL: pgsql/src/include/utils/rel.h,v 1.77 2004/08/28 20:31:44 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -110,17 +110,18 @@ typedef struct RelationData BlockNumber rd_targblock; /* current insertion target block, or * InvalidBlockNumber */ int rd_refcnt; /* reference count */ - bool rd_isnew; /* rel was created in current xact */ - - /* - * NOTE: rd_isnew should be relied on only for optimization purposes; - * it is possible for new-ness to be "forgotten" (eg, after CLUSTER). - */ bool rd_istemp; /* rel uses the local buffer mgr */ - char rd_isnailed; /* rel is nailed in cache: 0 = no, 1 = yes, - * 2 = yes but possibly invalid */ + bool rd_isnailed; /* rel is nailed in cache */ + bool rd_isvalid; /* relcache entry is valid */ char rd_indexvalid; /* state of rd_indexlist: 0 = not valid, * 1 = valid, 2 = temporarily forced */ + TransactionId rd_createxact; /* rel was created in current xact */ + /* + * rd_createxact is the XID of the highest subtransaction the rel has + * survived into; or zero if the rel was not created in the current + * transaction. This should be relied on only for optimization purposes; + * it is possible for new-ness to be "forgotten" (eg, after CLUSTER). + */ Form_pg_class rd_rel; /* RELATION tuple */ TupleDesc rd_att; /* tuple descriptor */ Oid rd_id; /* relation's object id */ @@ -230,6 +231,16 @@ typedef Relation *RelationPtr; #define RelationGetNamespace(relation) \ ((relation)->rd_rel->relnamespace) +/* + * RELATION_IS_LOCAL + * If a rel is either temp or newly created in the current transaction, + * it can be assumed to be visible only to the current backend. + * + * Beware of multiple eval of argument + */ +#define RELATION_IS_LOCAL(relation) \ + ((relation)->rd_istemp || TransactionIdIsValid((relation)->rd_createxact)) + /* routines in utils/cache/relcache.c */ extern void RelationIncrementReferenceCount(Relation rel); extern void RelationDecrementReferenceCount(Relation rel); |