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/*-------------------------------------------------------------------------
*
* standbydefs.h
* Frontend exposed definitions for hot standby mode.
*
*
* Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/storage/standbydefs.h
*
*-------------------------------------------------------------------------
*/
#ifndef STANDBYDEFS_H
#define STANDBYDEFS_H
#include "access/xlogreader.h"
#include "lib/stringinfo.h"
#include "storage/lockdefs.h"
#include "storage/sinval.h"
/* Recovery handlers for the Standby Rmgr (RM_STANDBY_ID) */
extern void standby_redo(XLogReaderState *record);
extern void standby_desc(StringInfo buf, XLogReaderState *record);
extern const char *standby_identify(uint8 info);
extern void standby_desc_invalidations(StringInfo buf,
int nmsgs, SharedInvalidationMessage *msgs,
Oid dbId, Oid tsId,
bool relcacheInitFileInval);
/*
* XLOG message types
*/
#define XLOG_STANDBY_LOCK 0x00
#define XLOG_RUNNING_XACTS 0x10
#define XLOG_INVALIDATIONS 0x20
typedef struct xl_standby_locks
{
int nlocks; /* number of entries in locks array */
xl_standby_lock locks[FLEXIBLE_ARRAY_MEMBER];
} xl_standby_locks;
/*
* When we write running xact data to WAL, we use this structure.
*/
typedef struct xl_running_xacts
{
int xcnt; /* # of xact ids in xids[] */
int subxcnt; /* # of subxact ids in xids[] */
bool subxid_overflow; /* snapshot overflowed, subxids missing */
TransactionId nextXid; /* xid from ShmemVariableCache->nextFullXid */
TransactionId oldestRunningXid; /* *not* oldestXmin */
TransactionId latestCompletedXid; /* so we can set xmax */
TransactionId xids[FLEXIBLE_ARRAY_MEMBER];
} xl_running_xacts;
/*
* Invalidations for standby, currently only when transactions without an
* assigned xid commit.
*/
typedef struct xl_invalidations
{
Oid dbId; /* MyDatabaseId */
Oid tsId; /* MyDatabaseTableSpace */
bool relcacheInitFileInval; /* invalidate relcache init files */
int nmsgs; /* number of shared inval msgs */
SharedInvalidationMessage msgs[FLEXIBLE_ARRAY_MEMBER];
} xl_invalidations;
#define MinSizeOfInvalidations offsetof(xl_invalidations, msgs)
#endif /* STANDBYDEFS_H */
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