itemptr.c File Reference

#include "postgres.h"
#include "storage/itemptr.h"

Include dependency graph for itemptr.c:

Go to the source code of this file.

Functions
	StaticAssertDecl (sizeof(ItemPointerData)==3 *sizeof(uint16), "ItemPointerData struct is improperly padded")
bool	ItemPointerEquals (ItemPointer pointer1, ItemPointer pointer2)
int32	ItemPointerCompare (ItemPointer arg1, ItemPointer arg2)
void	ItemPointerInc (ItemPointer pointer)
void	ItemPointerDec (ItemPointer pointer)

Function Documentation

ItemPointerCompare()

int32 ItemPointerCompare	(	ItemPointer	arg1,
		ItemPointer	arg2
	)

Definition at line 51 of file itemptr.c.

{
    /*
     * Use ItemPointerGet{Offset,Block}NumberNoCheck to avoid asserting
     * ip_posid != 0, which may not be true for a user-supplied TID.
     */
    BlockNumber b1 = ItemPointerGetBlockNumberNoCheck(arg1);
    BlockNumber b2 = ItemPointerGetBlockNumberNoCheck(arg2);
 
    if (b1 < b2)
        return -1;
    else if (b1 > b2)
        return 1;
    else if (ItemPointerGetOffsetNumberNoCheck(arg1) <
             ItemPointerGetOffsetNumberNoCheck(arg2))
        return -1;
    else if (ItemPointerGetOffsetNumberNoCheck(arg1) >
             ItemPointerGetOffsetNumberNoCheck(arg2))
        return 1;
    else
        return 0;
}

References ItemPointerGetBlockNumberNoCheck(), and ItemPointerGetOffsetNumberNoCheck().

Referenced by _bt_binsrch_posting(), _bt_check_unique(), _bt_compare(), _bt_delitems_delete_check(), _bt_load(), _bt_split(), _bt_swap_posting(), _bt_truncate(), brin_minmax_multi_distance_tid(), bt_target_page_check(), bttidcmp(), dataBeginPlaceToPageLeaf(), heap_getnextslot_tidrange(), heap_set_tidrange(), heapam_index_validate_scan(), tidcmp(), tideq(), tidge(), tidgt(), tidlarger(), tidle(), tidlt(), tidne(), TidRangeEval(), and tidsmaller().

ItemPointerDec()

void ItemPointerDec

(

ItemPointer

pointer

)

Definition at line 114 of file itemptr.c.

{
    BlockNumber blk = ItemPointerGetBlockNumberNoCheck(pointer);
    OffsetNumber off = ItemPointerGetOffsetNumberNoCheck(pointer);
 
    if (off == 0)
    {
        if (blk != 0)
        {
            off = PG_UINT16_MAX;
            blk--;
        }
    }
    else
        off--;
 
    ItemPointerSet(pointer, blk, off);
}

References ItemPointerGetBlockNumberNoCheck(), ItemPointerGetOffsetNumberNoCheck(), ItemPointerSet(), and PG_UINT16_MAX.

Referenced by TidRangeEval().

ItemPointerEquals()

bool ItemPointerEquals	(	ItemPointer	pointer1,
		ItemPointer	pointer2
	)

Definition at line 35 of file itemptr.c.

{
    if (ItemPointerGetBlockNumber(pointer1) ==
        ItemPointerGetBlockNumber(pointer2) &&
        ItemPointerGetOffsetNumber(pointer1) ==
        ItemPointerGetOffsetNumber(pointer2))
        return true;
    else
        return false;
}

References ItemPointerGetBlockNumber(), and ItemPointerGetOffsetNumber().

Referenced by _bt_delitems_delete_check(), _bt_killitems(), _hash_kill_items(), brinGetTupleForHeapBlock(), check_exclusion_or_unique_constraint(), collectMatchesForHeapRow(), compile_pltcl_function(), gistplacetopage(), heap_delete(), heap_get_latest_tid(), heap_inplace_update_and_unlock(), heap_lock_tuple(), heap_lock_updated_tuple(), heap_lock_updated_tuple_rec(), heap_update(), heapam_tuple_lock(), HeapTupleSatisfiesUpdate(), index_getnext_slot(), lookup_C_func(), plpgsql_compile(), PLy_procedure_valid(), processPendingPage(), rewrite_heap_tuple(), scanGetCandidate(), SearchCatCacheList(), SearchSysCacheLocked1(), spgAddPendingTID(), test_itemptr_pair(), test_lockmode_for_conflict(), and validate_plperl_function().

ItemPointerInc()

void ItemPointerInc

(

ItemPointer

pointer

)

Definition at line 84 of file itemptr.c.

{
    BlockNumber blk = ItemPointerGetBlockNumberNoCheck(pointer);
    OffsetNumber off = ItemPointerGetOffsetNumberNoCheck(pointer);
 
    if (off == PG_UINT16_MAX)
    {
        if (blk != InvalidBlockNumber)
        {
            off = 0;
            blk++;
        }
    }
    else
        off++;
 
    ItemPointerSet(pointer, blk, off);
}

References InvalidBlockNumber, ItemPointerGetBlockNumberNoCheck(), ItemPointerGetOffsetNumberNoCheck(), ItemPointerSet(), and PG_UINT16_MAX.

Referenced by TidRangeEval().

StaticAssertDecl()

StaticAssertDecl	(	sizeof(ItemPointerData)	= =3 *sizeof(uint16),
		"ItemPointerData struct is improperly padded"
	)