138 lines
3.8 KiB
C
138 lines
3.8 KiB
C
/*-------------------------------------------------------------------------
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*
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* walsender_private.h
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* Private definitions from replication/walsender.c.
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*
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* Portions Copyright (c) 2010-2023, PostgreSQL Global Development Group
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*
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* src/include/replication/walsender_private.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef _WALSENDER_PRIVATE_H
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#define _WALSENDER_PRIVATE_H
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#include "access/xlog.h"
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#include "lib/ilist.h"
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#include "nodes/nodes.h"
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#include "nodes/replnodes.h"
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#include "replication/syncrep.h"
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#include "storage/condition_variable.h"
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#include "storage/latch.h"
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#include "storage/shmem.h"
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#include "storage/spin.h"
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typedef enum WalSndState
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{
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WALSNDSTATE_STARTUP = 0,
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WALSNDSTATE_BACKUP,
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WALSNDSTATE_CATCHUP,
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WALSNDSTATE_STREAMING,
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WALSNDSTATE_STOPPING
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} WalSndState;
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/*
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* Each walsender has a WalSnd struct in shared memory.
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*
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* This struct is protected by its 'mutex' spinlock field, except that some
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* members are only written by the walsender process itself, and thus that
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* process is free to read those members without holding spinlock. pid and
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* needreload always require the spinlock to be held for all accesses.
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*/
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typedef struct WalSnd
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{
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pid_t pid; /* this walsender's PID, or 0 if not active */
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WalSndState state; /* this walsender's state */
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XLogRecPtr sentPtr; /* WAL has been sent up to this point */
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bool needreload; /* does currently-open file need to be
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* reloaded? */
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/*
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* The xlog locations that have been written, flushed, and applied by
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* standby-side. These may be invalid if the standby-side has not offered
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* values yet.
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*/
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XLogRecPtr write;
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XLogRecPtr flush;
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XLogRecPtr apply;
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/* Measured lag times, or -1 for unknown/none. */
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TimeOffset writeLag;
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TimeOffset flushLag;
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TimeOffset applyLag;
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/*
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* The priority order of the standby managed by this WALSender, as listed
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* in synchronous_standby_names, or 0 if not-listed.
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*/
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int sync_standby_priority;
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/* Protects shared variables in this structure. */
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slock_t mutex;
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/*
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* Pointer to the walsender's latch. Used by backends to wake up this
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* walsender when it has work to do. NULL if the walsender isn't active.
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*/
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Latch *latch;
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/*
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* Timestamp of the last message received from standby.
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*/
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TimestampTz replyTime;
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ReplicationKind kind;
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} WalSnd;
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extern PGDLLIMPORT WalSnd *MyWalSnd;
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/* There is one WalSndCtl struct for the whole database cluster */
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typedef struct
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{
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/*
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* Synchronous replication queue with one queue per request type.
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* Protected by SyncRepLock.
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*/
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dlist_head SyncRepQueue[NUM_SYNC_REP_WAIT_MODE];
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/*
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* Current location of the head of the queue. All waiters should have a
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* waitLSN that follows this value. Protected by SyncRepLock.
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*/
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XLogRecPtr lsn[NUM_SYNC_REP_WAIT_MODE];
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/*
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* Are any sync standbys defined? Waiting backends can't reload the
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* config file safely, so checkpointer updates this value as needed.
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* Protected by SyncRepLock.
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*/
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bool sync_standbys_defined;
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/* used as a registry of physical / logical walsenders to wake */
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ConditionVariable wal_flush_cv;
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ConditionVariable wal_replay_cv;
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WalSnd walsnds[FLEXIBLE_ARRAY_MEMBER];
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} WalSndCtlData;
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extern PGDLLIMPORT WalSndCtlData *WalSndCtl;
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extern void WalSndSetState(WalSndState state);
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/*
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* Internal functions for parsing the replication grammar, in repl_gram.y and
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* repl_scanner.l
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*/
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extern int replication_yyparse(void);
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extern int replication_yylex(void);
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extern void replication_yyerror(const char *message) pg_attribute_noreturn();
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extern void replication_scanner_init(const char *str);
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extern void replication_scanner_finish(void);
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extern bool replication_scanner_is_replication_command(void);
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extern PGDLLIMPORT Node *replication_parse_result;
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#endif /* _WALSENDER_PRIVATE_H */
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