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/*-------------------------------------------------------------------------
*
* syncrep.h
* Exports from replication/syncrep.c.
*
* Portions Copyright (c) 2010-2023, PostgreSQL Global Development Group
*
* IDENTIFICATION
* src/include/replication/syncrep.h
*
*-------------------------------------------------------------------------
*/
#ifndef _SYNCREP_H
#define _SYNCREP_H
#include "access/xlogdefs.h"
#define SyncRepRequested() \
(max_wal_senders > 0 && synchronous_commit > SYNCHRONOUS_COMMIT_LOCAL_FLUSH)
/* SyncRepWaitMode */
#define SYNC_REP_NO_WAIT (-1)
#define SYNC_REP_WAIT_WRITE 0
#define SYNC_REP_WAIT_FLUSH 1
#define SYNC_REP_WAIT_APPLY 2
#define NUM_SYNC_REP_WAIT_MODE 3
/* syncRepState */
#define SYNC_REP_NOT_WAITING 0
#define SYNC_REP_WAITING 1
#define SYNC_REP_WAIT_COMPLETE 2
/* syncrep_method of SyncRepConfigData */
#define SYNC_REP_PRIORITY 0
#define SYNC_REP_QUORUM 1
/*
* SyncRepGetCandidateStandbys returns an array of these structs,
* one per candidate synchronous walsender.
*/
typedef struct SyncRepStandbyData
{
/* Copies of relevant fields from WalSnd shared-memory struct */
pid_t pid;
XLogRecPtr write;
XLogRecPtr flush;
XLogRecPtr apply;
int sync_standby_priority;
/* Index of this walsender in the WalSnd shared-memory array */
int walsnd_index;
/* This flag indicates whether this struct is about our own process */
bool is_me;
} SyncRepStandbyData;
/*
* Struct for the configuration of synchronous replication.
*
* Note: this must be a flat representation that can be held in a single
* chunk of malloc'd memory, so that it can be stored as the "extra" data
* for the synchronous_standby_names GUC.
*/
typedef struct SyncRepConfigData
{
int config_size; /* total size of this struct, in bytes */
int num_sync; /* number of sync standbys that we need to
* wait for */
uint8 syncrep_method; /* method to choose sync standbys */
int nmembers; /* number of members in the following list */
/* member_names contains nmembers consecutive nul-terminated C strings */
char member_names[FLEXIBLE_ARRAY_MEMBER];
} SyncRepConfigData;
extern PGDLLIMPORT SyncRepConfigData *SyncRepConfig;
/* communication variables for parsing synchronous_standby_names GUC */
extern PGDLLIMPORT SyncRepConfigData *syncrep_parse_result;
extern PGDLLIMPORT char *syncrep_parse_error_msg;
/* user-settable parameters for synchronous replication */
extern PGDLLIMPORT char *SyncRepStandbyNames;
/* called by user backend */
extern void SyncRepWaitForLSN(XLogRecPtr lsn, bool commit);
/* called at backend exit */
extern void SyncRepCleanupAtProcExit(void);
/* called by wal sender */
extern void SyncRepInitConfig(void);
extern void SyncRepReleaseWaiters(void);
/* called by wal sender and user backend */
extern int SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys);
/* called by checkpointer */
extern void SyncRepUpdateSyncStandbysDefined(void);
/*
* Internal functions for parsing synchronous_standby_names grammar,
* in syncrep_gram.y and syncrep_scanner.l
*/
extern int syncrep_yyparse(void);
extern int syncrep_yylex(void);
extern void syncrep_yyerror(const char *str);
extern void syncrep_scanner_init(const char *str);
extern void syncrep_scanner_finish(void);
#endif /* _SYNCREP_H */
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