75 lines
2.3 KiB
C
75 lines
2.3 KiB
C
/*-------------------------------------------------------------------------
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*
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* standbydefs.h
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* Frontend exposed definitions for hot standby mode.
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*
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*
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* Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/storage/standbydefs.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef STANDBYDEFS_H
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#define STANDBYDEFS_H
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#include "access/xlogreader.h"
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#include "lib/stringinfo.h"
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#include "storage/lockdefs.h"
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#include "storage/sinval.h"
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/* Recovery handlers for the Standby Rmgr (RM_STANDBY_ID) */
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extern void standby_redo(XLogReaderState *record);
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extern void standby_desc(StringInfo buf, XLogReaderState *record);
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extern const char *standby_identify(uint8 info);
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extern void standby_desc_invalidations(StringInfo buf,
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int nmsgs, SharedInvalidationMessage *msgs,
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Oid dbId, Oid tsId,
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bool relcacheInitFileInval);
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/*
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* XLOG message types
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*/
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#define XLOG_STANDBY_LOCK 0x00
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#define XLOG_RUNNING_XACTS 0x10
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#define XLOG_INVALIDATIONS 0x20
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typedef struct xl_standby_locks
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{
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int nlocks; /* number of entries in locks array */
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xl_standby_lock locks[FLEXIBLE_ARRAY_MEMBER];
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} xl_standby_locks;
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/*
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* When we write running xact data to WAL, we use this structure.
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*/
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typedef struct xl_running_xacts
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{
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int xcnt; /* # of xact ids in xids[] */
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int subxcnt; /* # of subxact ids in xids[] */
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bool subxid_overflow; /* snapshot overflowed, subxids missing */
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TransactionId nextXid; /* xid from ShmemVariableCache->nextXid */
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TransactionId oldestRunningXid; /* *not* oldestXmin */
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TransactionId latestCompletedXid; /* so we can set xmax */
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TransactionId xids[FLEXIBLE_ARRAY_MEMBER];
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} xl_running_xacts;
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/*
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* Invalidations for standby, currently only when transactions without an
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* assigned xid commit.
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*/
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typedef struct xl_invalidations
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{
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Oid dbId; /* MyDatabaseId */
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Oid tsId; /* MyDatabaseTableSpace */
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bool relcacheInitFileInval; /* invalidate relcache init files */
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int nmsgs; /* number of shared inval msgs */
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SharedInvalidationMessage msgs[FLEXIBLE_ARRAY_MEMBER];
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} xl_invalidations;
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#define MinSizeOfInvalidations offsetof(xl_invalidations, msgs)
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#endif /* STANDBYDEFS_H */
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