ambuild parameters

Hi, I'm trying to implement my own access method. Now I've implemented
and compiled it but I've problems when I try to use it.

I got folowing AM function definitions:

CREATE OR REPLACE FUNCTION atomrtgettuple (INTERNAL ,INT4) RETURNS BOOL
AS 'E:\\pgsource\\postgresql-8.0.7\\contrib\\atomrtree\\libatomrtree.dll', 'atomrtgettuple'
LANGUAGE 'C';

CREATE OR REPLACE FUNCTION atomrtinsert (INTERNAL ,INTERNAL, INTERNAL, INTERNAL) RETURNS INTERNAL
AS 'E:\\pgsource\\postgresql-8.0.7\\contrib\\atomrtree\\libatomrtree.dll', 'atomrtinsert'
LANGUAGE 'C';

CREATE OR REPLACE FUNCTION atomrtbeginscan (INTERNAL ,INT4, INTERNAL) RETURNS INTERNAL
AS 'E:\\pgsource\\postgresql-8.0.7\\contrib\\atomrtree\\libatomrtree.dll', 'atomrtbeginscan'
LANGUAGE 'C';

CREATE OR REPLACE FUNCTION atomrtrescan (INTERNAL ,INTERNAL) RETURNS VOID
AS 'E:\\pgsource\\postgresql-8.0.7\\contrib\\atomrtree\\libatomrtree.dll', 'atomrtrescan'
LANGUAGE 'C';

CREATE OR REPLACE FUNCTION atomrtendscan (INTERNAL) RETURNS VOID
AS 'E:\\pgsource\\postgresql-8.0.7\\contrib\\atomrtree\\libatomrtree.dll', 'atomrtendscan'
LANGUAGE 'C';

CREATE OR REPLACE FUNCTION atomrtmarkpos (INTERNAL) RETURNS VOID
AS 'E:\\pgsource\\postgresql-8.0.7\\contrib\\atomrtree\\libatomrtree.dll', 'atomrtmarkpos'
LANGUAGE 'C';

CREATE OR REPLACE FUNCTION atomrtrestrpos (INTERNAL) RETURNS VOID
AS 'E:\\pgsource\\postgresql-8.0.7\\contrib\\atomrtree\\libatomrtree.dll', 'atomrtrestrpos'
LANGUAGE 'C';

CREATE OR REPLACE FUNCTION atomrtbuild (INTERNAL ,INTERNAL, INTERNAL) RETURNS VOID
AS 'E:\\pgsource\\postgresql-8.0.7\\contrib\\atomrtree\\libatomrtree.dll', 'atomrtbuild'
LANGUAGE 'C';

CREATE OR REPLACE FUNCTION atomrtbulkdelete (INTERNAL ,INTERNAL, INTERNAL) RETURNS INTERNAL
AS 'E:\\pgsource\\postgresql-8.0.7\\contrib\\atomrtree\\libatomrtree.dll', 'atomrtbulkdelete'
LANGUAGE 'C';

CREATE OR REPLACE FUNCTION atomrtcostestimate (INTERNAL, INTERNAL, INTERNAL, INTERNAL, INTERNAL, INTERNAL, INTERNAL, INTERNAL) RETURNS VOID
AS 'E:\\pgsource\\postgresql-8.0.7\\contrib\\atomrtree\\libatomrtree.dll', 'atomrtcostestimate'
LANGUAGE 'C';

Then I insert record into pg_am:

insert into pg_am(
amname,
amowner,
amstrategies,
amsupport,
amorderstrategy,
amcanunique,
amcanmulticol,
amindexnulls,
amconcurrent,
amgettuple,
aminsert,
ambeginscan,
amrescan,
amendscan,
ammarkpos,
amrestrpos,
ambuild,
ambulkdelete,
amvacuumcleanup,
amcostestimate)
values (
'atomrtree',
(select usesysid from pg_shadow where usename = current_user),
1,
0,
0,
'f',
't',
't',
'f',
'atomrtgettuple',
'atomrtinsert',
'atomrtbeginscan',
'atomrtrescan',
'atomrtendscan',
'atomrtmarkpos',
'atomrtrestrpos',
'atomrtbuild',
'atomrtbulkdelete',
'-',
'atomrtcostestimate'
);

And when i try to set atomrtree index (create index idx_atom1 on test
using atomrtree(col1);), I get error telling me that I can't read on
address xxxx.

The problem is in the atomrtbuild function, which fails, when I try to
work with index_relation variable, which is parameter of that function. The
fucntion seems like:

Datum
atomrtbuild(PG_FUNCTION_ARGS)
{
Relation heap_rel = (Relation) PG_GETARG_POINTER(0);
Relation index_rel = (Relation) PG_GETARG_POINTER(1);
IndexInfo *indexInfo = (IndexInfo *) PG_GETARG_POINTER(2);
double reltuples;
AtomRTBuildState buildstate;
Buffer buffer;
BlockNumber block_num;
Page page;
AtomRTreePageOpaque page_opaque;

WriteToMyLog("Entering atomrtbuild");

/* no locking is needed */

WriteToMyLog("Before initAtomRTState");
initAtomRTState(&buildstate.atomrtstate, index_rel);
WriteToMyLog("After initAtomRTState");

if (index_rel == NULL)
WriteToMyLog("index_rel is null");
else
WriteToMyLog("index_rel is NOT null");

WriteToMyLog("Before RelationGetNumberOfBlocks(index_rel)");

if (RelationGetNumberOfBlocks(index_rel) != 0)
elog(ERROR, "index_rel \"%s\" already contains data",
RelationGetRelationName(index_rel));

And RelationGetNumberOfBlocks(index_rel) is the place, where it fails
(the index_rel variable is not null).

The same problem is, when I try to use heap_rel.

I really can't find, where's the problem. I use almost the same code
as btree or rtree does. Isn't the problem in the way I create the
functions? I mean if the parameter type INTERNAL in:
CREATE OR REPLACE FUNCTION atomrtbuild (INTERNAL ,INTERNAL, INTERNAL) RETURNS VOID
AS 'E:\\pgsource\\postgresql-8.0.7\\contrib\\atomrtree\\libatomrtree.dll', 'atomrtbuild'
LANGUAGE 'C';

is OK?

I spent whole afternoon trying to change the params for OPAQUE aso.,
but nothing works:(

Thanks,
David Hoksza