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/*-------------------------------------------------------------------------
*
* xlogprefetcher.h
* Declarations for the recovery prefetching module.
*
* Portions Copyright (c) 2022, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* src/include/access/xlogprefetcher.h
*-------------------------------------------------------------------------
*/
#ifndef XLOGPREFETCHER_H
#define XLOGPREFETCHER_H
#include "access/xlogdefs.h"
#include "access/xlogreader.h"
#include "access/xlogrecord.h"
/* GUCs */
extern PGDLLIMPORT int recovery_prefetch;
/* Possible values for recovery_prefetch */
typedef enum
{
RECOVERY_PREFETCH_OFF,
RECOVERY_PREFETCH_ON,
RECOVERY_PREFETCH_TRY
} RecoveryPrefetchValue;
struct XLogPrefetcher;
typedef struct XLogPrefetcher XLogPrefetcher;
extern void XLogPrefetchReconfigure(void);
extern size_t XLogPrefetchShmemSize(void);
extern void XLogPrefetchShmemInit(void);
extern void XLogPrefetchResetStats(void);
extern XLogPrefetcher *XLogPrefetcherAllocate(XLogReaderState *reader);
extern void XLogPrefetcherFree(XLogPrefetcher *prefetcher);
extern XLogReaderState *XLogPrefetcherGetReader(XLogPrefetcher *prefetcher);
extern void XLogPrefetcherBeginRead(XLogPrefetcher *prefetcher,
XLogRecPtr recPtr);
extern XLogRecord *XLogPrefetcherReadRecord(XLogPrefetcher *prefetcher,
char **errmsg);
extern void XLogPrefetcherComputeStats(XLogPrefetcher *prefetcher);
#endif
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