blob: 6ab4f8a0d8c7b1b6dad54446fa973a01f8f05d0d (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
/*-------------------------------------------------------------------------
*
* xid.c
* POSTGRES transaction identifier datatype.
*
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: xid.c,v 1.35 2002/06/20 20:29:25 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include <limits.h>
#include "access/xact.h"
#define PG_GETARG_TRANSACTIONID(n) DatumGetTransactionId(PG_GETARG_DATUM(n))
#define PG_RETURN_TRANSACTIONID(x) return TransactionIdGetDatum(x)
Datum
xidin(PG_FUNCTION_ARGS)
{
char *str = PG_GETARG_CSTRING(0);
PG_RETURN_TRANSACTIONID((TransactionId) strtoul(str, NULL, 0));
}
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);
}
/*
* 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));
}
/*
* 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 = GetCurrentTransactionId();
/* Permanent XIDs are always infinitely old */
if (!TransactionIdIsNormal(xid))
PG_RETURN_INT32(INT_MAX);
PG_RETURN_INT32((int32) (now - xid));
}
|
