83 lines
2.4 KiB
C
83 lines
2.4 KiB
C
/*-------------------------------------------------------------------------
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*
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* walreceiver.h
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* Exports from replication/walreceiverfuncs.c.
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*
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* Portions Copyright (c) 2010-2010, PostgreSQL Global Development Group
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*
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* $PostgreSQL: pgsql/src/include/replication/walreceiver.h,v 1.3 2010/01/20 09:16:24 heikki Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef _WALRECEIVER_H
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#define _WALRECEIVER_H
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#include "access/xlogdefs.h"
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#include "storage/spin.h"
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/*
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* MAXCONNINFO: maximum size of a connection string.
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*
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* XXX: Should this move to pg_config_manual.h?
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*/
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#define MAXCONNINFO 1024
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/*
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* Values for WalRcv->walRcvState.
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*/
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typedef enum
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{
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WALRCV_NOT_STARTED,
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WALRCV_RUNNING, /* walreceiver has been started */
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WALRCV_STOPPING, /* requested to stop, but still running */
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WALRCV_STOPPED /* stopped and mustn't start up again */
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} WalRcvState;
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/* Shared memory area for management of walreceiver process */
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typedef struct
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{
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/*
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* connection string; is used for walreceiver to connect with
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* the primary.
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*/
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char conninfo[MAXCONNINFO];
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/*
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* PID of currently active walreceiver process, and the current state.
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*/
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pid_t pid;
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WalRcvState walRcvState;
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/*
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* receivedUpto-1 is the last byte position that has been already
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* received. When startup process starts the walreceiver, it sets this
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* to the point where it wants the streaming to begin. After that,
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* walreceiver updates this whenever it flushes the received WAL.
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*/
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XLogRecPtr receivedUpto;
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slock_t mutex; /* locks shared variables shown above */
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} WalRcvData;
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extern PGDLLIMPORT WalRcvData *WalRcv;
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/* libpqwalreceiver hooks */
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typedef bool (*walrcv_connect_type) (char *conninfo, XLogRecPtr startpoint);
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extern PGDLLIMPORT walrcv_connect_type walrcv_connect;
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typedef bool (*walrcv_receive_type) (int timeout, XLogRecPtr *recptr, char **buffer, int *len);
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extern PGDLLIMPORT walrcv_receive_type walrcv_receive;
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typedef void (*walrcv_disconnect_type) (void);
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extern PGDLLIMPORT walrcv_disconnect_type walrcv_disconnect;
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extern void WalReceiverMain(void);
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extern Size WalRcvShmemSize(void);
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extern void WalRcvShmemInit(void);
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extern bool WalRcvInProgress(void);
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extern XLogRecPtr WaitNextXLogAvailable(XLogRecPtr recptr, bool *finished);
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extern void RequestXLogStreaming(XLogRecPtr recptr, const char *conninfo);
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extern XLogRecPtr GetWalRcvWriteRecPtr(void);
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#endif /* _WALRECEIVER_H */
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