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the standby has written, flushed, and applied the WAL. At the moment, this is for informational purposes only, the values are only shown in pg_stat_replication system view, but in the future they will also be needed for synchronous replication. Extracted from Simon riggs' synchronous replication patch by Robert Haas, with some tweaking by me.
96 lines
2.4 KiB
C
96 lines
2.4 KiB
C
/*-------------------------------------------------------------------------
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*
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* walsender.h
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* Exports from replication/walsender.c.
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*
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* Portions Copyright (c) 2010-2011, PostgreSQL Global Development Group
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*
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* src/include/replication/walsender.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef _WALSENDER_H
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#define _WALSENDER_H
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#include "access/xlog.h"
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#include "nodes/nodes.h"
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#include "storage/latch.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;
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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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typedef struct WalSnd
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{
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pid_t pid; /* this walsender's process id, or 0 */
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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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/*
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* The xlog locations that have been written, flushed, and applied
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* by standby-side. These may be invalid if the standby-side has not
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* offered 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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/* Protects shared variables shown above. */
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slock_t mutex;
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/*
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* Latch used by backends to wake up this walsender when it has work
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* to do.
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*/
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Latch latch;
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} WalSnd;
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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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WalSnd walsnds[1]; /* VARIABLE LENGTH ARRAY */
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} WalSndCtlData;
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extern WalSndCtlData *WalSndCtl;
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/* global state */
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extern bool am_walsender;
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extern volatile sig_atomic_t walsender_shutdown_requested;
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extern volatile sig_atomic_t walsender_ready_to_stop;
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/* user-settable parameters */
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extern int WalSndDelay;
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extern int max_wal_senders;
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extern int WalSenderMain(void);
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extern void WalSndSignals(void);
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extern Size WalSndShmemSize(void);
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extern void WalSndShmemInit(void);
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extern void WalSndWakeup(void);
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extern void WalSndSetState(WalSndState state);
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extern void XLogRead(char *buf, XLogRecPtr recptr, Size nbytes);
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extern Datum pg_stat_get_wal_senders(PG_FUNCTION_ARGS);
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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 *str);
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extern void replication_scanner_init(const char *query_string);
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extern void replication_scanner_finish(void);
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extern Node *replication_parse_result;
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#endif /* _WALSENDER_H */
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