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/*-------------------------------------------------------------------------
*
* xid.c--
* POSTGRES transaction identifier code.
*
* Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/transam/Attic/xid.c,v 1.1.1.1 1996/07/09 06:21:14 scrappy 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 <stdio.h>
#include "postgres.h"
#include "utils/palloc.h"
#include "utils/elog.h"
#include "utils/memutils.h"
#include "utils/nabstime.h"
extern TransactionId NullTransactionId;
extern TransactionId DisabledTransactionId;
extern TransactionId AmiTransactionId;
extern TransactionId FirstTransactionId;
/* ----------------------------------------------------------------
* TransactionIdIsValid
*
* Macro-ize me.
* ----------------------------------------------------------------
*/
bool
TransactionIdIsValid(TransactionId transactionId)
{
return ((bool) (transactionId != NullTransactionId) );
}
/* XXX char16 name for catalogs */
TransactionId
xidin(char *representation)
{
return (atol(representation));
}
/* XXX char16 name for catalogs */
char*
xidout(TransactionId transactionId)
{
/* return(TransactionIdFormString(transactionId)); */
char *representation;
/* maximum 32 bit unsigned integer representation takes 10 chars */
representation = palloc(11);
(void)sprintf(representation, "%u", transactionId);
return (representation);
}
/* ----------------------------------------------------------------
* StoreInvalidTransactionId
*
* Maybe do away with Pointer types in these routines.
* Macro-ize this one.
* ----------------------------------------------------------------
*/
void
StoreInvalidTransactionId(TransactionId *destination)
{
*destination = NullTransactionId;
}
/* ----------------------------------------------------------------
* TransactionIdStore
*
* Macro-ize this one.
* ----------------------------------------------------------------
*/
void
TransactionIdStore(TransactionId transactionId,
TransactionId *destination)
{
*destination = transactionId;
}
/* ----------------------------------------------------------------
* TransactionIdEquals
* ----------------------------------------------------------------
*/
bool
TransactionIdEquals(TransactionId id1, TransactionId id2)
{
return ((bool) (id1 == id2));
}
/* ----------------------------------------------------------------
* TransactionIdIsLessThan
* ----------------------------------------------------------------
*/
bool
TransactionIdIsLessThan(TransactionId id1, TransactionId id2)
{
return ((bool)(id1 < id2));
}
/* ----------------------------------------------------------------
* xideq
* ----------------------------------------------------------------
*/
/*
* xideq - returns 1, iff xid1 == xid2
* 0 else;
*/
bool
xideq(TransactionId xid1, TransactionId xid2)
{
return( (bool) (xid1 == xid2) );
}
/* ----------------------------------------------------------------
* TransactionIdIncrement
* ----------------------------------------------------------------
*/
void
TransactionIdIncrement(TransactionId *transactionId)
{
(*transactionId)++;
if (*transactionId == DisabledTransactionId)
elog(FATAL, "TransactionIdIncrement: exhausted XID's");
return;
}
/* ----------------------------------------------------------------
* TransactionIdAdd
* ----------------------------------------------------------------
*/
void
TransactionIdAdd(TransactionId *xid, int value)
{
*xid += value;
return;
}
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