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Add the ability to create indexes 'concurrently', that is, without

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blocking concurrent writes to the table.  Greg Stark, with a little help
from Tom Lane.
This commit is contained in:
Tom Lane
2006-08-25 04:06:58 +00:00
parent 8f91e2b607
commit e093dcdd28
34 changed files with 1025 additions and 138 deletions
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32
src/backend/storage/page/itemptr.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/page/itemptr.c,v 1.17 2006/07/14 14:52:23 momjian Exp $
* $PostgreSQL: pgsql/src/backend/storage/page/itemptr.c,v 1.18 2006/08/25 04:06:53 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -16,13 +16,14 @@
#include "storage/itemptr.h"
/*
* ItemPointerEquals
* Returns true if both item pointers point to the same item,
* otherwise returns false.
*
* Note:
* Assumes that the disk item pointers are not NULL.
* Asserts that the disk item pointers are both valid!
*/
bool
ItemPointerEquals(ItemPointer pointer1, ItemPointer pointer2)
@ -35,3 +36,30 @@ ItemPointerEquals(ItemPointer pointer1, ItemPointer pointer2)
else
return false;
}
/*
* ItemPointerCompare
* Generic btree-style comparison for item pointers.
*/
int32
ItemPointerCompare(ItemPointer arg1, ItemPointer arg2)
{
/*
* Don't use ItemPointerGetBlockNumber or ItemPointerGetOffsetNumber here,
* because they assert ip_posid != 0 which might not be true for a
* user-supplied TID.
*/
BlockNumber b1 = BlockIdGetBlockNumber(&(arg1->ip_blkid));
BlockNumber b2 = BlockIdGetBlockNumber(&(arg2->ip_blkid));
if (b1 < b2)
return -1;
else if (b1 > b2)
return 1;
else if (arg1->ip_posid < arg2->ip_posid)
return -1;
else if (arg1->ip_posid > arg2->ip_posid)
return 1;
else
return 0;
}