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Revise the TIDBitmap API to support multiple concurrent iterations over a

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bitmap.  This is extracted from Greg Stark's posix_fadvise patch; it seems
worth committing separately, since it's potentially useful independently of
posix_fadvise.
This commit is contained in:
Tom Lane
2009-01-10 21:08:36 +00:00
parent 3b34e98242
commit 43a57cf365
7 changed files with 151 additions and 88 deletions
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7
src/backend/access/gin/ginscan.c
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@@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/gin/ginscan.c,v 1.20 2009/01/01 17:23:34 momjian Exp $
* $PostgreSQL: pgsql/src/backend/access/gin/ginscan.c,v 1.21 2009/01/10 21:08:36 tgl Exp $
*-------------------------------------------------------------------------
*/
@@ -61,6 +61,8 @@ fillScanKey(GinState *ginstate, GinScanKey key, OffsetNumber attnum, Datum query
key->scanEntry[i].offset = InvalidOffsetNumber;
key->scanEntry[i].buffer = InvalidBuffer;
key->scanEntry[i].partialMatch = NULL;
key->scanEntry[i].partialMatchIterator = NULL;
key->scanEntry[i].partialMatchResult = NULL;
key->scanEntry[i].strategy = strategy;
key->scanEntry[i].list = NULL;
key->scanEntry[i].nlist = 0;
@@ -107,6 +109,7 @@ resetScanKeys(GinScanKey keys, uint32 nkeys)
key->scanEntry[j].list = NULL;
key->scanEntry[j].nlist = 0;
key->scanEntry[j].partialMatch = NULL;
key->scanEntry[j].partialMatchIterator = NULL;
key->scanEntry[j].partialMatchResult = NULL;
}
}
@@ -132,6 +135,8 @@ freeScanKeys(GinScanKey keys, uint32 nkeys)
ReleaseBuffer(key->scanEntry[j].buffer);
if (key->scanEntry[j].list)
pfree(key->scanEntry[j].list);
if (key->scanEntry[j].partialMatchIterator)
tbm_end_iterate(key->scanEntry[j].partialMatchIterator);
if (key->scanEntry[j].partialMatch)
tbm_free(key->scanEntry[j].partialMatch);
}