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Ensure age() returns a stable value rather than the latest value

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Simon Riggs
2012-05-11 14:36:24 +01:00
parent 3652d72dd4
commit b06679e012
3 changed files with 26 additions and 5 deletions
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8
src/backend/utils/adt/xid.c
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@@ -19,6 +19,7 @@
#include "access/transam.h"
#include "access/xact.h"
#include "libpq/pqformat.h"
#include "storage/proc.h"
#include "utils/builtins.h"
#define PG_GETARG_TRANSACTIONID(n) DatumGetTransactionId(PG_GETARG_DATUM(n))
@@ -87,16 +88,13 @@ xideq(PG_FUNCTION_ARGS)
}
/*
* xid_age - compute age of an XID (relative to current xact)
* xid_age - compute age of an XID (relative to latest stable xid)
*/
Datum
xid_age(PG_FUNCTION_ARGS)
{
TransactionId xid = PG_GETARG_TRANSACTIONID(0);
TransactionId now = GetTopTransactionIdIfAny();
if (!TransactionIdIsValid(now))
now = ReadNewTransactionId();
TransactionId now = GetStableLatestTransactionId();
/* Permanent XIDs are always infinitely old */
if (!TransactionIdIsNormal(xid))