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116 lines
4.1 KiB
C
116 lines
4.1 KiB
C
/*-------------------------------------------------------------------------
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*
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* standby.h
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* Definitions for hot standby mode.
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*
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*
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* Portions Copyright (c) 1996-2011, 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/standby.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef STANDBY_H
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#define STANDBY_H
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#include "access/xlog.h"
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#include "storage/lock.h"
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#include "storage/procsignal.h"
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#include "storage/relfilenode.h"
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/* User-settable GUC parameters */
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extern int vacuum_defer_cleanup_age;
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extern int max_standby_archive_delay;
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extern int max_standby_streaming_delay;
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extern void InitRecoveryTransactionEnvironment(void);
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extern void ShutdownRecoveryTransactionEnvironment(void);
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extern void ResolveRecoveryConflictWithSnapshot(TransactionId latestRemovedXid,
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RelFileNode node);
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extern void ResolveRecoveryConflictWithRemovedTransactionId(void);
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extern void ResolveRecoveryConflictWithTablespace(Oid tsid);
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extern void ResolveRecoveryConflictWithDatabase(Oid dbid);
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extern void ResolveRecoveryConflictWithBufferPin(void);
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extern void SendRecoveryConflictWithBufferPin(ProcSignalReason reason);
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extern void CheckRecoveryConflictDeadlock(void);
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/*
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* Standby Rmgr (RM_STANDBY_ID)
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*
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* Standby recovery manager exists to perform actions that are required
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* to make hot standby work. That includes logging AccessExclusiveLocks taken
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* by transactions and running-xacts snapshots.
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*/
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extern void StandbyAcquireAccessExclusiveLock(TransactionId xid, Oid dbOid, Oid relOid);
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extern void StandbyReleaseLockTree(TransactionId xid,
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int nsubxids, TransactionId *subxids);
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extern void StandbyReleaseAllLocks(void);
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extern void StandbyReleaseOldLocks(int nxids, TransactionId *xids);
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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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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[1]; /* VARIABLE LENGTH ARRAY */
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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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bool subxid_overflow; /* snapshot overflowed, subxids missing */
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TransactionId nextXid; /* copy of 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[1]; /* VARIABLE LENGTH ARRAY */
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} xl_running_xacts;
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#define MinSizeOfXactRunningXacts offsetof(xl_running_xacts, xids)
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/* Recovery handlers for the Standby Rmgr (RM_STANDBY_ID) */
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extern void standby_redo(XLogRecPtr lsn, XLogRecord *record);
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extern void standby_desc(StringInfo buf, uint8 xl_info, char *rec);
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/*
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* Declarations for GetRunningTransactionData(). Similar to Snapshots, but
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* not quite. This has nothing at all to do with visibility on this server,
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* so this is completely separate from snapmgr.c and snapmgr.h.
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* This data is important for creating the initial snapshot state on a
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* standby server. We need lots more information than a normal snapshot,
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* hence we use a specific data structure for our needs. This data
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* is written to WAL as a separate record immediately after each
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* checkpoint. That means that wherever we start a standby from we will
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* almost immediately see the data we need to begin executing queries.
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*/
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typedef struct RunningTransactionsData
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{
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int xcnt; /* # of xact ids in xids[] */
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bool subxid_overflow; /* snapshot overflowed, subxids missing */
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TransactionId nextXid; /* copy of 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; /* array of (sub)xids still running */
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} RunningTransactionsData;
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typedef RunningTransactionsData *RunningTransactions;
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extern void LogAccessExclusiveLock(Oid dbOid, Oid relOid);
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extern void LogAccessExclusiveLockPrepare(void);
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extern void LogStandbySnapshot(TransactionId *nextXid);
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#endif /* STANDBY_H */
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