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📄 acl.h(13.83 KB)
📄 aclchk_internal.h(1.42 KB)
📄 array.h(18.84 KB)
📄 arrayaccess.h(2.97 KB)
📄 ascii.h(579 B)
📄 attoptcache.h(725 B)
📄 builtins.h(56.08 KB)
📄 bytea.h(1.63 KB)
📄 cash.h(2.07 KB)
📄 catcache.h(7.4 KB)
📄 combocid.h(870 B)
📄 date.h(7.77 KB)
📄 datetime.h(10.59 KB)
📄 datum.h(1.88 KB)
📄 dynahash.h(498 B)
📄 dynamic_loader.h(648 B)
📄 elog.h(14.74 KB)
📄 errcodes.h(20.1 KB)
📄 evtcache.h(934 B)
📄 expandeddatum.h(6.89 KB)
📄 fmgroids.h(72.24 KB)
📄 fmgrtab.h(1.15 KB)
📄 formatting.h(1.41 KB)
📄 geo_decls.h(16.22 KB)
📄 guc.h(15.6 KB)
📄 guc_tables.h(7.22 KB)
📄 help_config.h(457 B)
📄 hsearch.h(5.97 KB)
📄 index_selfuncs.h(2.16 KB)
📄 inet.h(4.6 KB)
📄 int8.h(4.12 KB)
📄 inval.h(1.71 KB)
📄 json.h(3.26 KB)
📄 jsonapi.h(4.19 KB)
📄 jsonb.h(16.13 KB)
📄 logtape.h(1.5 KB)
📄 lsyscache.h(6.91 KB)
📄 memdebug.h(1.25 KB)
📄 memutils.h(6.16 KB)
📄 nabstime.h(5.79 KB)
📄 numeric.h(1.92 KB)
📄 palloc.h(5.04 KB)
📄 pg_crc.h(3.42 KB)
📄 pg_locale.h(2.63 KB)
📄 pg_lsn.h(1.29 KB)
📄 pg_rusage.h(847 B)
📄 plancache.h(8.36 KB)
📄 portal.h(9.64 KB)
📄 probes.h(6.54 KB)
📄 ps_status.h(668 B)
📄 rangetypes.h(8.31 KB)
📄 rel.h(18.18 KB)
📄 relcache.h(3.79 KB)
📄 relfilenodemap.h(561 B)
📄 relmapper.h(1.8 KB)
📄 reltrigger.h(1.95 KB)
📄 resowner.h(2.52 KB)
📄 resowner_private.h(3.42 KB)
📄 rls.h(1.73 KB)
📄 ruleutils.h(1.2 KB)
📄 sampling.h(1.96 KB)
📄 selfuncs.h(9.39 KB)
📄 snapmgr.h(4.13 KB)
📄 snapshot.h(4.2 KB)
📄 sortsupport.h(10.81 KB)
📄 spccache.h(604 B)
📄 syscache.h(5.91 KB)
📄 timeout.h(2.48 KB)
📄 timestamp.h(10.34 KB)
📄 tqual.h(4.11 KB)
📄 tuplesort.h(4.86 KB)
📄 tuplestore.h(3.23 KB)
📄 typcache.h(5.71 KB)
📄 tzparser.h(1.13 KB)
📄 uuid.h(861 B)
📄 varbit.h(4.31 KB)
📄 xml.h(3.89 KB)

Editing: snapmgr.h

/*-------------------------------------------------------------------------
 *
 * snapmgr.h
 *	  POSTGRES snapshot manager
 *
 * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/utils/snapmgr.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef SNAPMGR_H
#define SNAPMGR_H

#include "fmgr.h"
#include "utils/relcache.h"
#include "utils/resowner.h"
#include "utils/snapshot.h"

/*
 * The structure used to map times to TransactionId values for the "snapshot
 * too old" feature must have a few entries at the tail to hold old values;
 * otherwise the lookup will often fail and the expected early pruning or
 * vacuum will not usually occur.  It is best if this padding is for a number
 * of minutes greater than a thread would normally be stalled, but it's OK if
 * early vacuum opportunities are occasionally missed, so there's no need to
 * use an extreme value or get too fancy.  10 minutes seems plenty.
 */
#define OLD_SNAPSHOT_PADDING_ENTRIES 10
#define OLD_SNAPSHOT_TIME_MAP_ENTRIES (old_snapshot_threshold + OLD_SNAPSHOT_PADDING_ENTRIES)

/*
 * Common definition of relation properties that allow early pruning/vacuuming
 * when old_snapshot_threshold >= 0.
 */
#define RelationAllowsEarlyPruning(rel) \
( \
	 RelationNeedsWAL(rel) \
  && !IsCatalogRelation(rel) \
  && !RelationIsAccessibleInLogicalDecoding(rel) \
  && !RelationHasUnloggedIndex(rel) \
)

#define EarlyPruningEnabled(rel) (old_snapshot_threshold >= 0 && RelationAllowsEarlyPruning(rel))

/* GUC variables */
extern PGDLLIMPORT int old_snapshot_threshold;

extern Size SnapMgrShmemSize(void);
extern void SnapMgrInit(void);
extern int64 GetSnapshotCurrentTimestamp(void);
extern int64 GetOldSnapshotThresholdTimestamp(void);

extern bool FirstSnapshotSet;

extern PGDLLIMPORT TransactionId TransactionXmin;
extern PGDLLIMPORT TransactionId RecentXmin;
extern PGDLLIMPORT TransactionId RecentGlobalXmin;
extern PGDLLIMPORT TransactionId RecentGlobalDataXmin;

extern Snapshot GetTransactionSnapshot(void);
extern Snapshot GetLatestSnapshot(void);
extern void SnapshotSetCommandId(CommandId curcid);
extern Snapshot GetOldestSnapshot(void);

extern Snapshot GetCatalogSnapshot(Oid relid);
extern Snapshot GetNonHistoricCatalogSnapshot(Oid relid);
extern void InvalidateCatalogSnapshot(void);
extern void InvalidateCatalogSnapshotConditionally(void);

extern void PushActiveSnapshot(Snapshot snapshot);
extern void PushCopiedSnapshot(Snapshot snapshot);
extern void UpdateActiveSnapshotCommandId(void);
extern void PopActiveSnapshot(void);
extern Snapshot GetActiveSnapshot(void);
extern bool ActiveSnapshotSet(void);

extern Snapshot RegisterSnapshot(Snapshot snapshot);
extern void UnregisterSnapshot(Snapshot snapshot);
extern Snapshot RegisterSnapshotOnOwner(Snapshot snapshot, ResourceOwner owner);
extern void UnregisterSnapshotFromOwner(Snapshot snapshot, ResourceOwner owner);

extern void AtSubCommit_Snapshot(int level);
extern void AtSubAbort_Snapshot(int level);
extern void AtEOXact_Snapshot(bool isCommit);

extern Datum pg_export_snapshot(PG_FUNCTION_ARGS);
extern void ImportSnapshot(const char *idstr);
extern bool XactHasExportedSnapshots(void);
extern void DeleteAllExportedSnapshotFiles(void);
extern bool ThereAreNoPriorRegisteredSnapshots(void);
extern TransactionId TransactionIdLimitedForOldSnapshots(TransactionId recentXmin,
									Relation relation);
extern void MaintainOldSnapshotTimeMapping(int64 whenTaken, TransactionId xmin);

extern char *ExportSnapshot(Snapshot snapshot);

/* Support for catalog timetravel for logical decoding */
struct HTAB;
extern struct HTAB *HistoricSnapshotGetTupleCids(void);
extern void SetupHistoricSnapshot(Snapshot snapshot_now, struct HTAB *tuplecids);
extern void TeardownHistoricSnapshot(bool is_error);
extern bool HistoricSnapshotActive(void);

extern Size EstimateSnapshotSpace(Snapshot snapshot);
extern void SerializeSnapshot(Snapshot snapshot, char *start_address);
extern Snapshot RestoreSnapshot(char *start_address);
extern void RestoreTransactionSnapshot(Snapshot snapshot, void *master_pgproc);

#endif   /* SNAPMGR_H */

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Editing: snapmgr.h

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