/*
* xideq - are two xids equal?
*/
Datum
xideq(PG_FUNCTION_ARGS)
{
TransactionId xid1 = PG_GETARG_TRANSACTIONID(0);
TransactionId xid2 = PG_GETARG_TRANSACTIONID(1);
PG_RETURN_BOOL(TransactionIdEquals(xid1, xid2));
}
/*
* xidsend - converts xid to binary format
*/
Datum
xidsend(PG_FUNCTION_ARGS)
{
TransactionId arg1 = PG_GETARG_TRANSACTIONID(0);
StringInfoData buf;
pq_begintypsend(&buf);
pq_sendint(&buf, arg1, sizeof(arg1));
PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
}
/*
* mxid_age - compute age of a multi XID (relative to latest stable mxid)
*/
Datum
mxid_age(PG_FUNCTION_ARGS)
{
TransactionId xid = PG_GETARG_TRANSACTIONID(0);
MultiXactId now = ReadNextMultiXactId();
if (!MultiXactIdIsValid(xid))
PG_RETURN_INT32(INT_MAX);
PG_RETURN_INT32((int32) (now - xid));
}
/*
* xid_age - compute age of an XID (relative to current xact)
*/
Datum
xid_age(PG_FUNCTION_ARGS)
{
TransactionId xid = PG_GETARG_TRANSACTIONID(0);
TransactionId now = GetTopTransactionId();
/* Permanent XIDs are always infinitely old */
if (!TransactionIdIsNormal(xid))
PG_RETURN_INT32(INT_MAX);
PG_RETURN_INT32((int32) (now - xid));
}
Datum
xidout(PG_FUNCTION_ARGS)
{
TransactionId transactionId = PG_GETARG_TRANSACTIONID(0);
/* maximum 32 bit unsigned integer representation takes 10 chars */
char *str = palloc(11);
snprintf(str, 11, "%lu", (unsigned long) transactionId);
PG_RETURN_CSTRING(str);
}
