PostgreSQL Source Code: src/backend/access/rmgrdesc/mxactdesc.c Source File

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mxactdesc.c
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1/*-------------------------------------------------------------------------
2 *
3 * mxactdesc.c
4 * rmgr descriptor routines for access/transam/multixact.c
5 *
6 * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
7 * Portions Copyright (c) 1994, Regents of the University of California
8 *
9 *
10 * IDENTIFICATION
11 * src/backend/access/rmgrdesc/mxactdesc.c
12 *
13 *-------------------------------------------------------------------------
14 */
15#include "postgres.h"
16
17#include "access/multixact.h"
18
19static void
20 out_member(StringInfo buf, MultiXactMember *member)
21{
22 appendStringInfo(buf, "%u ", member->xid);
23 switch (member->status)
24 {
25 case MultiXactStatusForKeyShare:
26 appendStringInfoString(buf, "(keysh) ");
27 break;
28 case MultiXactStatusForShare:
29 appendStringInfoString(buf, "(sh) ");
30 break;
31 case MultiXactStatusForNoKeyUpdate:
32 appendStringInfoString(buf, "(fornokeyupd) ");
33 break;
34 case MultiXactStatusForUpdate:
35 appendStringInfoString(buf, "(forupd) ");
36 break;
37 case MultiXactStatusNoKeyUpdate:
38 appendStringInfoString(buf, "(nokeyupd) ");
39 break;
40 case MultiXactStatusUpdate:
41 appendStringInfoString(buf, "(upd) ");
42 break;
43 default:
44 appendStringInfoString(buf, "(unk) ");
45 break;
46 }
47}
48
49void
50 multixact_desc(StringInfo buf, XLogReaderState *record)
51{
52 char *rec = XLogRecGetData(record);
53 uint8 info = XLogRecGetInfo(record) & ~XLR_INFO_MASK;
54
55 if (info == XLOG_MULTIXACT_ZERO_OFF_PAGE ||
56 info == XLOG_MULTIXACT_ZERO_MEM_PAGE)
57 {
58 int64 pageno;
59
60 memcpy(&pageno, rec, sizeof(pageno));
61 appendStringInfo(buf, "%" PRId64, pageno);
62 }
63 else if (info == XLOG_MULTIXACT_CREATE_ID)
64 {
65 xl_multixact_create *xlrec = (xl_multixact_create *) rec;
66 int i;
67
68 appendStringInfo(buf, "%u offset %u nmembers %d: ", xlrec->mid,
69 xlrec->moff, xlrec->nmembers);
70 for (i = 0; i < xlrec->nmembers; i++)
71 out_member(buf, &xlrec->members[i]);
72 }
73 else if (info == XLOG_MULTIXACT_TRUNCATE_ID)
74 {
75 xl_multixact_truncate *xlrec = (xl_multixact_truncate *) rec;
76
77 appendStringInfo(buf, "offsets [%u, %u), members [%u, %u)",
78 xlrec->startTruncOff, xlrec->endTruncOff,
79 xlrec->startTruncMemb, xlrec->endTruncMemb);
80 }
81}
82
83const char *
84 multixact_identify(uint8 info)
85{
86 const char *id = NULL;
87
88 switch (info & ~XLR_INFO_MASK)
89 {
90 case XLOG_MULTIXACT_ZERO_OFF_PAGE:
91 id = "ZERO_OFF_PAGE";
92 break;
93 case XLOG_MULTIXACT_ZERO_MEM_PAGE:
94 id = "ZERO_MEM_PAGE";
95 break;
96 case XLOG_MULTIXACT_CREATE_ID:
97 id = "CREATE_ID";
98 break;
99 case XLOG_MULTIXACT_TRUNCATE_ID:
100 id = "TRUNCATE_ID";
101 break;
102 }
103
104 return id;
105}
uint8_t uint8
Definition: c.h:536
int64_t int64
Definition: c.h:535
i
int i
Definition: isn.c:77
#define XLOG_MULTIXACT_ZERO_MEM_PAGE
Definition: multixact.h:70
#define XLOG_MULTIXACT_ZERO_OFF_PAGE
Definition: multixact.h:69
@ MultiXactStatusForShare
Definition: multixact.h:41
@ MultiXactStatusForNoKeyUpdate
Definition: multixact.h:42
@ MultiXactStatusNoKeyUpdate
Definition: multixact.h:45
@ MultiXactStatusUpdate
Definition: multixact.h:47
@ MultiXactStatusForUpdate
Definition: multixact.h:43
@ MultiXactStatusForKeyShare
Definition: multixact.h:40
#define XLOG_MULTIXACT_TRUNCATE_ID
Definition: multixact.h:72
#define XLOG_MULTIXACT_CREATE_ID
Definition: multixact.h:71
static void out_member(StringInfo buf, MultiXactMember *member)
Definition: mxactdesc.c:20
void multixact_desc(StringInfo buf, XLogReaderState *record)
Definition: mxactdesc.c:50
const char * multixact_identify(uint8 info)
Definition: mxactdesc.c:84
static char * buf
Definition: pg_test_fsync.c:72
void appendStringInfo(StringInfo str, const char *fmt,...)
Definition: stringinfo.c:145
void appendStringInfoString(StringInfo str, const char *s)
Definition: stringinfo.c:230
TransactionId xid
Definition: multixact.h:59
MultiXactStatus status
Definition: multixact.h:60
Definition: multixact.h:75
MultiXactId mid
Definition: multixact.h:76
int32 nmembers
Definition: multixact.h:78
MultiXactMember members[FLEXIBLE_ARRAY_MEMBER]
Definition: multixact.h:79
MultiXactOffset moff
Definition: multixact.h:77
Definition: multixact.h:85
MultiXactId endTruncOff
Definition: multixact.h:90
MultiXactOffset startTruncMemb
Definition: multixact.h:93
MultiXactOffset endTruncMemb
Definition: multixact.h:94
MultiXactId startTruncOff
Definition: multixact.h:89
#define XLogRecGetInfo(decoder)
Definition: xlogreader.h:410
#define XLogRecGetData(decoder)
Definition: xlogreader.h:415
#define XLR_INFO_MASK
Definition: xlogrecord.h:62

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