-- ----------
-- txid.sql
--
--	SQL script for loading the transaction ID compatible datatype 
--
--	Copyright (c) 2003-2007, PostgreSQL Global Development Group
--	Author: Jan Wieck, Afilias USA INC.
--	64-bit txids: Marko Kreen, Skype Technologies
--
--	$PostgreSQL: pgsql/contrib/txid/txid.sql.in,v 1.2 2007/10/11 19:54:17 tgl Exp $
--
-- ----------

-- Adjust this setting to control where the objects get created.
SET search_path = public;

BEGIN;

--
-- A special transaction snapshot data type for faster visibility checks
--
CREATE TYPE txid_snapshot;

CREATE FUNCTION txid_snapshot_in(cstring)
	RETURNS txid_snapshot
	AS 'MODULE_PATHNAME' LANGUAGE C
	IMMUTABLE STRICT;
CREATE FUNCTION txid_snapshot_out(txid_snapshot)
	RETURNS cstring
	AS 'MODULE_PATHNAME' LANGUAGE C
	IMMUTABLE STRICT;
CREATE FUNCTION txid_snapshot_recv(internal)
	RETURNS txid_snapshot
	AS 'MODULE_PATHNAME' LANGUAGE C
	IMMUTABLE STRICT;
CREATE FUNCTION txid_snapshot_send(txid_snapshot)
	RETURNS bytea
	AS 'MODULE_PATHNAME' LANGUAGE C
	IMMUTABLE STRICT;

--
-- The data type itself
--
CREATE TYPE txid_snapshot (
	INPUT = txid_snapshot_in,
	OUTPUT = txid_snapshot_out,
	RECEIVE = txid_snapshot_recv,
	SEND = txid_snapshot_send,
	INTERNALLENGTH = variable,
	STORAGE = extended,
	ALIGNMENT = double
);

--
-- Functions for txid
--
CREATE FUNCTION txid_current()
	RETURNS bigint
	AS 'MODULE_PATHNAME', 'txid_current' LANGUAGE C
	STABLE;

CREATE FUNCTION txid_current_snapshot()
	RETURNS txid_snapshot
	AS 'MODULE_PATHNAME', 'txid_current_snapshot' LANGUAGE C
	STABLE;

CREATE FUNCTION txid_snapshot_xmin(txid_snapshot)
	RETURNS bigint
	AS 'MODULE_PATHNAME', 'txid_snapshot_xmin' LANGUAGE C
	IMMUTABLE STRICT;

CREATE FUNCTION txid_snapshot_xmax(txid_snapshot)
	RETURNS bigint
	AS 'MODULE_PATHNAME', 'txid_snapshot_xmax' LANGUAGE C
	IMMUTABLE STRICT;

CREATE FUNCTION txid_snapshot_xip(txid_snapshot)
	RETURNS setof bigint
	AS 'MODULE_PATHNAME', 'txid_snapshot_xip' LANGUAGE C
	IMMUTABLE STRICT;

CREATE FUNCTION txid_visible_in_snapshot(bigint, txid_snapshot)
	RETURNS boolean
	AS 'MODULE_PATHNAME', 'txid_visible_in_snapshot' LANGUAGE C
	IMMUTABLE STRICT;

COMMIT;