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/*-------------------------------------------------------------------------
*
* xid.c
* POSTGRES transaction identifier type.
*
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: xid.c,v 1.30 2001/03/22 03:59:18 momjian Exp $
*
* OLD COMMENTS
* XXX WARNING
* Much of this file will change when we change our representation
* of transaction ids -cim 3/23/90
*
* It is time to make the switch from 5 byte to 4 byte transaction ids
* This file was totally reworked. -mer 5/22/92
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/xact.h"
/*
* TransactionId is typedef'd as uint32, so...
*/
#define PG_GETARG_TRANSACTIONID(n) PG_GETARG_UINT32(n)
#define PG_RETURN_TRANSACTIONID(x) PG_RETURN_UINT32(x)
extern TransactionId NullTransactionId;
extern TransactionId DisabledTransactionId;
extern TransactionId AmiTransactionId;
extern TransactionId FirstTransactionId;
/* XXX name for catalogs */
Datum
xidin(PG_FUNCTION_ARGS)
{
char *representation = PG_GETARG_CSTRING(0);
PG_RETURN_TRANSACTIONID((TransactionId) atol(representation));
}
/* XXX name for catalogs */
Datum
xidout(PG_FUNCTION_ARGS)
{
TransactionId transactionId = PG_GETARG_TRANSACTIONID(0);
/* maximum 32 bit unsigned integer representation takes 10 chars */
char *representation = palloc(11);
snprintf(representation, 11, "%lu", (unsigned long) transactionId);
PG_RETURN_CSTRING(representation);
}
/* ----------------------------------------------------------------
* xideq
* ----------------------------------------------------------------
*/
/*
* xideq - returns 1, iff xid1 == xid2
* 0 else;
*/
Datum
xideq(PG_FUNCTION_ARGS)
{
TransactionId xid1 = PG_GETARG_TRANSACTIONID(0);
TransactionId xid2 = PG_GETARG_TRANSACTIONID(1);
PG_RETURN_BOOL(xid1 == xid2);
}
/* ----------------------------------------------------------------
* TransactionIdAdd
* ----------------------------------------------------------------
*/
void
TransactionIdAdd(TransactionId *xid, int value)
{
*xid += value;
}
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