walsummarizer.h

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/*-------------------------------------------------------------------------
 *
 * walsummarizer.h
 *
 * Header file for background WAL summarization process.
 *
 * Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
 *
 * IDENTIFICATION
 *    src/include/postmaster/walsummarizer.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef WALSUMMARIZER_H
#define WALSUMMARIZER_H
 
#include "access/xlogdefs.h"
 
extern PGDLLIMPORT bool summarize_wal;
extern PGDLLIMPORT int wal_summary_keep_time;
 
extern Size WalSummarizerShmemSize(void);
extern void WalSummarizerShmemInit(void);
extern void WalSummarizerMain(char *startup_data, size_t startup_data_len) pg_attribute_noreturn();
 
extern void GetWalSummarizerState(TimeLineID *summarized_tli,
                                  XLogRecPtr *summarized_lsn,
                                  XLogRecPtr *pending_lsn,
                                  int *summarizer_pid);
extern XLogRecPtr GetOldestUnsummarizedLSN(TimeLineID *tli,
                                           bool *lsn_is_exact,
                                           bool reset_pending_lsn);
extern void SetWalSummarizerLatch(void);
extern XLogRecPtr WaitForWalSummarization(XLogRecPtr lsn, long timeout,
                                          XLogRecPtr *pending_lsn);
 
#endif