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/*-------------------------------------------------------------------------
*
* walsender.h
* Exports from replication/walsender.c.
*
* Portions Copyright (c) 2010-2011, PostgreSQL Global Development Group
*
* src/include/replication/walsender.h
*
*-------------------------------------------------------------------------
*/
#ifndef _WALSENDER_H
#define _WALSENDER_H
#include "access/xlog.h"
#include "nodes/nodes.h"
#include "storage/latch.h"
#include "storage/spin.h"
typedef enum WalSndState
{
WALSNDSTATE_STARTUP = 0,
WALSNDSTATE_BACKUP,
WALSNDSTATE_CATCHUP,
WALSNDSTATE_STREAMING
} WalSndState;
/*
* Each walsender has a WalSnd struct in shared memory.
*/
typedef struct WalSnd
{
pid_t pid; /* this walsender's process id, or 0 */
WalSndState state; /* this walsender's state */
XLogRecPtr sentPtr; /* WAL has been sent up to this point */
/*
* The xlog locations that have been written, flushed, and applied
* by standby-side. These may be invalid if the standby-side has not
* offered values yet.
*/
XLogRecPtr write;
XLogRecPtr flush;
XLogRecPtr apply;
/* Protects shared variables shown above. */
slock_t mutex;
/*
* Latch used by backends to wake up this walsender when it has work
* to do.
*/
Latch latch;
} WalSnd;
/* There is one WalSndCtl struct for the whole database cluster */
typedef struct
{
WalSnd walsnds[1]; /* VARIABLE LENGTH ARRAY */
} WalSndCtlData;
extern WalSndCtlData *WalSndCtl;
/* global state */
extern bool am_walsender;
extern volatile sig_atomic_t walsender_shutdown_requested;
extern volatile sig_atomic_t walsender_ready_to_stop;
/* user-settable parameters */
extern int WalSndDelay;
extern int max_wal_senders;
extern int WalSenderMain(void);
extern void WalSndSignals(void);
extern Size WalSndShmemSize(void);
extern void WalSndShmemInit(void);
extern void WalSndWakeup(void);
extern void WalSndSetState(WalSndState state);
extern void XLogRead(char *buf, XLogRecPtr recptr, Size nbytes);
extern Datum pg_stat_get_wal_senders(PG_FUNCTION_ARGS);
/*
* Internal functions for parsing the replication grammar, in repl_gram.y and
* repl_scanner.l
*/
extern int replication_yyparse(void);
extern int replication_yylex(void);
extern void replication_yyerror(const char *str);
extern void replication_scanner_init(const char *query_string);
extern void replication_scanner_finish(void);
extern Node *replication_parse_result;
#endif /* _WALSENDER_H */
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