autovacuum.h

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/*-------------------------------------------------------------------------
 *
 * autovacuum.h
 *    header file for integrated autovacuum daemon
 *
 *
 * Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/postmaster/autovacuum.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef AUTOVACUUM_H
#define AUTOVACUUM_H
 
#include "storage/block.h"
 
/*
 * Other processes can request specific work from autovacuum, identified by
 * AutoVacuumWorkItem elements.
 */
typedef enum
{
    AVW_BRINSummarizeRange
} AutoVacuumWorkItemType;
 
 
/* GUC variables */
extern PGDLLIMPORT bool autovacuum_start_daemon;
extern PGDLLIMPORT int autovacuum_max_workers;
extern PGDLLIMPORT int autovacuum_work_mem;
extern PGDLLIMPORT int autovacuum_naptime;
extern PGDLLIMPORT int autovacuum_vac_thresh;
extern PGDLLIMPORT double autovacuum_vac_scale;
extern PGDLLIMPORT int autovacuum_vac_ins_thresh;
extern PGDLLIMPORT double autovacuum_vac_ins_scale;
extern PGDLLIMPORT int autovacuum_anl_thresh;
extern PGDLLIMPORT double autovacuum_anl_scale;
extern PGDLLIMPORT int autovacuum_freeze_max_age;
extern PGDLLIMPORT int autovacuum_multixact_freeze_max_age;
extern PGDLLIMPORT double autovacuum_vac_cost_delay;
extern PGDLLIMPORT int autovacuum_vac_cost_limit;
 
/* autovacuum launcher PID, only valid when worker is shutting down */
extern PGDLLIMPORT int AutovacuumLauncherPid;
 
extern PGDLLIMPORT int Log_autovacuum_min_duration;
 
/* Status inquiry functions */
extern bool AutoVacuumingActive(void);
extern bool IsAutoVacuumLauncherProcess(void);
extern bool IsAutoVacuumWorkerProcess(void);
 
#define IsAnyAutoVacuumProcess() \
    (IsAutoVacuumLauncherProcess() || IsAutoVacuumWorkerProcess())
 
/* Functions to start autovacuum process, called from postmaster */
extern void autovac_init(void);
extern int  StartAutoVacLauncher(void);
extern int  StartAutoVacWorker(void);
 
/* called from postmaster when a worker could not be forked */
extern void AutoVacWorkerFailed(void);
 
/* autovacuum cost-delay balancer */
extern void AutoVacuumUpdateDelay(void);
 
#ifdef EXEC_BACKEND
extern void AutoVacLauncherMain(int argc, char *argv[]) pg_attribute_noreturn();
extern void AutoVacWorkerMain(int argc, char *argv[]) pg_attribute_noreturn();
extern void AutovacuumWorkerIAm(void);
extern void AutovacuumLauncherIAm(void);
#endif
 
extern bool AutoVacuumRequestWork(AutoVacuumWorkItemType type,
                                  Oid relationId, BlockNumber blkno);
 
/* shared memory stuff */
extern Size AutoVacuumShmemSize(void);
extern void AutoVacuumShmemInit(void);
 
#endif                          /* AUTOVACUUM_H */