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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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12
src/backend/access/gin/ginget.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/ginget.c,v 1.21 2009/01/01 17:23:34 momjian Exp $
* $PostgreSQL: pgsql/src/backend/access/gin/ginget.c,v 1.22 2009/01/10 21:08:36 tgl Exp $
*-------------------------------------------------------------------------
*/
@ -290,6 +290,7 @@ startScanEntry(Relation index, GinState *ginstate, GinScanEntry entry)
entry->list = NULL;
entry->nlist = 0;
entry->partialMatch = NULL;
entry->partialMatchIterator = NULL;
entry->partialMatchResult = NULL;
entry->reduceResult = FALSE;
entry->predictNumberResult = 0;
@ -311,6 +312,9 @@ startScanEntry(Relation index, GinState *ginstate, GinScanEntry entry)
*/
if ( entry->partialMatch )
{
if (entry->partialMatchIterator)
tbm_end_iterate(entry->partialMatchIterator);
entry->partialMatchIterator = NULL;
tbm_free( entry->partialMatch );
entry->partialMatch = NULL;
}
@ -323,7 +327,7 @@ startScanEntry(Relation index, GinState *ginstate, GinScanEntry entry)
if ( entry->partialMatch && !tbm_is_empty(entry->partialMatch) )
{
tbm_begin_iterate(entry->partialMatch);
entry->partialMatchIterator = tbm_begin_iterate(entry->partialMatch);
entry->isFinished = FALSE;
}
}
@ -534,11 +538,13 @@ entryGetItem(Relation index, GinScanEntry entry)
{
if ( entry->partialMatchResult == NULL || entry->offset >= entry->partialMatchResult->ntuples )
{
entry->partialMatchResult = tbm_iterate( entry->partialMatch );
entry->partialMatchResult = tbm_iterate( entry->partialMatchIterator );
if ( entry->partialMatchResult == NULL )
{
ItemPointerSet(&entry->curItem, InvalidBlockNumber, InvalidOffsetNumber);
tbm_end_iterate(entry->partialMatchIterator);
entry->partialMatchIterator = NULL;
entry->isFinished = TRUE;
break;
}