PostgreSQL Source Code: src/include/storage/standbydefs.h Source File

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standbydefs.h
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1/*-------------------------------------------------------------------------
2 *
3 * standbydefs.h
4 * Frontend exposed definitions for hot standby mode.
5 *
6 *
7 * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
8 * Portions Copyright (c) 1994, Regents of the University of California
9 *
10 * src/include/storage/standbydefs.h
11 *
12 *-------------------------------------------------------------------------
13 */
14#ifndef STANDBYDEFS_H
15#define STANDBYDEFS_H
16
17#include "access/xlogreader.h"
18#include "lib/stringinfo.h"
19#include "storage/lockdefs.h"
20#include "storage/sinval.h"
21
22/* Recovery handlers for the Standby Rmgr (RM_STANDBY_ID) */
23extern void standby_redo(XLogReaderState *record);
24extern void standby_desc(StringInfo buf, XLogReaderState *record);
25extern const char *standby_identify(uint8 info);
26extern void standby_desc_invalidations(StringInfo buf,
27 int nmsgs, SharedInvalidationMessage *msgs,
28 Oid dbId, Oid tsId,
29 bool relcacheInitFileInval);
30
31/*
32 * XLOG message types
33 */
34 #define XLOG_STANDBY_LOCK 0x00
35 #define XLOG_RUNNING_XACTS 0x10
36 #define XLOG_INVALIDATIONS 0x20
37
38 typedef struct xl_standby_locks
39{
40 int nlocks; /* number of entries in locks array */
41 xl_standby_lock locks[FLEXIBLE_ARRAY_MEMBER];
42 } xl_standby_locks;
43
44/*
45 * When we write running xact data to WAL, we use this structure.
46 */
47 typedef struct xl_running_xacts
48{
49 int xcnt; /* # of xact ids in xids[] */
50 int subxcnt; /* # of subxact ids in xids[] */
51 bool subxid_overflow; /* snapshot overflowed, subxids missing */
52 TransactionId nextXid; /* xid from TransamVariables->nextXid */
53 TransactionId oldestRunningXid; /* *not* oldestXmin */
54 TransactionId latestCompletedXid; /* so we can set xmax */
55
56 TransactionId xids[FLEXIBLE_ARRAY_MEMBER];
57 } xl_running_xacts;
58
59/*
60 * Invalidations for standby, currently only when transactions without an
61 * assigned xid commit.
62 */
63 typedef struct xl_invalidations
64{
65 Oid dbId; /* MyDatabaseId */
66 Oid tsId; /* MyDatabaseTableSpace */
67 bool relcacheInitFileInval; /* invalidate relcache init files */
68 int nmsgs; /* number of shared inval msgs */
69 SharedInvalidationMessage msgs[FLEXIBLE_ARRAY_MEMBER];
70 } xl_invalidations;
71
72 #define MinSizeOfInvalidations offsetof(xl_invalidations, msgs)
73
74#endif /* STANDBYDEFS_H */
uint8_t uint8
Definition: c.h:536
#define FLEXIBLE_ARRAY_MEMBER
Definition: c.h:470
uint32 TransactionId
Definition: c.h:657
static char * buf
Definition: pg_test_fsync.c:72
unsigned int Oid
Definition: postgres_ext.h:32
void standby_redo(XLogReaderState *record)
Definition: standby.c:1163
struct xl_standby_locks xl_standby_locks
void standby_desc(StringInfo buf, XLogReaderState *record)
Definition: standbydesc.c:47
const char * standby_identify(uint8 info)
Definition: standbydesc.c:79
void standby_desc_invalidations(StringInfo buf, int nmsgs, SharedInvalidationMessage *msgs, Oid dbId, Oid tsId, bool relcacheInitFileInval)
Definition: standbydesc.c:101
struct xl_invalidations xl_invalidations
struct xl_running_xacts xl_running_xacts
Definition: standbydefs.h:64
int nmsgs
Definition: standbydefs.h:68
SharedInvalidationMessage msgs[FLEXIBLE_ARRAY_MEMBER]
Definition: standbydefs.h:69
bool relcacheInitFileInval
Definition: standbydefs.h:67
Oid dbId
Definition: standbydefs.h:65
Oid tsId
Definition: standbydefs.h:66
Definition: standbydefs.h:48
int subxcnt
Definition: standbydefs.h:50
TransactionId latestCompletedXid
Definition: standbydefs.h:54
TransactionId oldestRunningXid
Definition: standbydefs.h:53
TransactionId xids[FLEXIBLE_ARRAY_MEMBER]
Definition: standbydefs.h:56
bool subxid_overflow
Definition: standbydefs.h:51
int xcnt
Definition: standbydefs.h:49
TransactionId nextXid
Definition: standbydefs.h:52
Definition: lockdefs.h:52
Definition: standbydefs.h:39
xl_standby_lock locks[FLEXIBLE_ARRAY_MEMBER]
Definition: standbydefs.h:41
int nlocks
Definition: standbydefs.h:40

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