diff options
Diffstat (limited to 'src/include/access/hash.h')
| -rw-r--r-- | src/include/access/hash.h | 29 |
1 files changed, 16 insertions, 13 deletions
diff --git a/src/include/access/hash.h b/src/include/access/hash.h index 735163d88ec..083bf548b39 100644 --- a/src/include/access/hash.h +++ b/src/include/access/hash.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2004, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/access/hash.h,v 1.57 2004/08/29 04:13:03 momjian Exp $ + * $PostgreSQL: pgsql/src/include/access/hash.h,v 1.58 2004/08/29 05:06:55 momjian Exp $ * * NOTES * modeled after Margo Seltzer's hash implementation for unix. @@ -56,6 +56,7 @@ typedef struct HashPageOpaqueData Bucket hasho_bucket; /* bucket number this pg belongs to */ uint16 hasho_flag; /* page type code, see above */ uint16 hasho_filler; /* available for future use */ + /* * We presently set hasho_filler to HASHO_FILL (0x1234); this is for * the convenience of pg_filedump, which otherwise would have a hard @@ -75,21 +76,23 @@ typedef HashPageOpaqueData *HashPageOpaque; typedef struct HashScanOpaqueData { /* - * By definition, a hash scan should be examining only one bucket. - * We record the bucket number here as soon as it is known. + * By definition, a hash scan should be examining only one bucket. We + * record the bucket number here as soon as it is known. */ Bucket hashso_bucket; bool hashso_bucket_valid; + /* * If we have a share lock on the bucket, we record it here. When * hashso_bucket_blkno is zero, we have no such lock. */ - BlockNumber hashso_bucket_blkno; + BlockNumber hashso_bucket_blkno; + /* - * We also want to remember which buffers we're currently examining in the - * scan. We keep these buffers pinned (but not locked) across hashgettuple - * calls, in order to avoid doing a ReadBuffer() for every tuple in the - * index. + * We also want to remember which buffers we're currently examining in + * the scan. We keep these buffers pinned (but not locked) across + * hashgettuple calls, in order to avoid doing a ReadBuffer() for + * every tuple in the index. */ Buffer hashso_curbuf; Buffer hashso_mrkbuf; @@ -148,8 +151,8 @@ typedef struct HashMetaPageData uint32 hashm_firstfree; /* lowest-number free ovflpage (bit#) */ uint32 hashm_nmaps; /* number of bitmap pages */ RegProcedure hashm_procid; /* hash procedure id from pg_proc */ - uint32 hashm_spares[HASH_MAX_SPLITPOINTS]; /* spare pages before - * each splitpoint */ + uint32 hashm_spares[HASH_MAX_SPLITPOINTS]; /* spare pages before + * each splitpoint */ BlockNumber hashm_mapp[HASH_MAX_BITMAPS]; /* blknos of ovfl bitmaps */ } HashMetaPageData; @@ -269,9 +272,9 @@ extern InsertIndexResult _hash_doinsert(Relation rel, HashItem hitem); extern Buffer _hash_addovflpage(Relation rel, Buffer metabuf, Buffer buf); extern BlockNumber _hash_freeovflpage(Relation rel, Buffer ovflbuf); extern void _hash_initbitmap(Relation rel, HashMetaPage metap, - BlockNumber blkno); + BlockNumber blkno); extern void _hash_squeezebucket(Relation rel, - Bucket bucket, BlockNumber bucket_blkno); + Bucket bucket, BlockNumber bucket_blkno); /* hashpage.c */ extern void _hash_getlock(Relation rel, BlockNumber whichlock, int access); @@ -304,7 +307,7 @@ extern bool _hash_checkqual(IndexScanDesc scan, IndexTuple itup); extern HashItem _hash_formitem(IndexTuple itup); extern uint32 _hash_datum2hashkey(Relation rel, Datum key); extern Bucket _hash_hashkey2bucket(uint32 hashkey, uint32 maxbucket, - uint32 highmask, uint32 lowmask); + uint32 highmask, uint32 lowmask); extern uint32 _hash_log2(uint32 num); extern void _hash_checkpage(Relation rel, Page page, int flags); |