SM0 She11

Path: / / usr / include / pgsql / server / utils

Full Path (server): /usr/include/pgsql/server/utils

📄 acl.h [E] [D]
📄 array.h [E] [D]
📄 ascii.h [E] [D]
📄 attoptcache.h [E] [D]
📄 builtins.h [E] [D]
📄 bytea.h [E] [D]
📄 cash.h [E] [D]
📄 catcache.h [E] [D]
📄 combocid.h [E] [D]
📄 date.h [E] [D]
📄 datetime.h [E] [D]
📄 datum.h [E] [D]
📄 dynahash.h [E] [D]
📄 dynamic_loader.h [E] [D]
📄 elog.h [E] [D]
📄 errcodes.h [E] [D]
📄 fmgroids.h [E] [D]
📄 fmgrtab.h [E] [D]
📄 formatting.h [E] [D]
📄 geo_decls.h [E] [D]
📄 guc.h [E] [D]
📄 guc_tables.h [E] [D]
📄 help_config.h [E] [D]
📄 hsearch.h [E] [D]
📄 inet.h [E] [D]
📄 int8.h [E] [D]
📄 inval.h [E] [D]
📄 json.h [E] [D]
📄 logtape.h [E] [D]
📄 lsyscache.h [E] [D]
📄 memutils.h [E] [D]
📄 nabstime.h [E] [D]
📄 numeric.h [E] [D]
📄 palloc.h [E] [D]
📄 pg_crc.h [E] [D]
📄 pg_crc_tables.h [E] [D]
📄 pg_locale.h [E] [D]
📄 pg_lzcompress.h [E] [D]
📄 pg_rusage.h [E] [D]
📄 plancache.h [E] [D]
📄 portal.h [E] [D]
📄 probes.h [E] [D]
📄 ps_status.h [E] [D]
📄 rangetypes.h [E] [D]
📄 rbtree.h [E] [D]
📄 rel.h [E] [D]
📄 relcache.h [E] [D]
📄 relmapper.h [E] [D]
📄 reltrigger.h [E] [D]
📄 resowner.h [E] [D]
📄 selfuncs.h [E] [D]
📄 snapmgr.h [E] [D]
📄 snapshot.h [E] [D]
📄 sortsupport.h [E] [D]
📄 spccache.h [E] [D]
📄 syscache.h [E] [D]
📄 timestamp.h [E] [D]
📄 tqual.h [E] [D]
📄 tuplesort.h [E] [D]
📄 tuplestore.h [E] [D]
📄 typcache.h [E] [D]
📄 tzparser.h [E] [D]
📄 uuid.h [E] [D]
📄 varbit.h [E] [D]
📄 xml.h [E] [D]

Editing: snapshot.h

/*-------------------------------------------------------------------------
 *
 * snapshot.h
 *	  POSTGRES snapshot definition
 *
 * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/utils/snapshot.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef SNAPSHOT_H
#define SNAPSHOT_H

#include "access/htup.h"
#include "storage/buf.h"

typedef struct SnapshotData *Snapshot;

#define InvalidSnapshot		((Snapshot) NULL)

/*
 * We use SnapshotData structures to represent both "regular" (MVCC)
 * snapshots and "special" snapshots that have non-MVCC semantics.
 * The specific semantics of a snapshot are encoded by the "satisfies"
 * function.
 */
typedef bool (*SnapshotSatisfiesFunc) (HeapTupleHeader tuple,
										   Snapshot snapshot, Buffer buffer);

typedef struct SnapshotData
{
	SnapshotSatisfiesFunc satisfies;	/* tuple test function */

/*
	 * The remaining fields are used only for MVCC snapshots, and are normally
	 * just zeroes in special snapshots.  (But xmin and xmax are used
	 * specially by HeapTupleSatisfiesDirty.)
	 *
	 * An MVCC snapshot can never see the effects of XIDs >= xmax. It can see
	 * the effects of all older XIDs except those listed in the snapshot. xmin
	 * is stored as an optimization to avoid needing to search the XID arrays
	 * for most tuples.
	 */
	TransactionId xmin;			/* all XID < xmin are visible to me */
	TransactionId xmax;			/* all XID >= xmax are invisible to me */
	TransactionId *xip;			/* array of xact IDs in progress */
	uint32		xcnt;			/* # of xact ids in xip[] */
	/* note: all ids in xip[] satisfy xmin <= xip[i] < xmax */
	int32		subxcnt;		/* # of xact ids in subxip[] */
	TransactionId *subxip;		/* array of subxact IDs in progress */
	bool		suboverflowed;	/* has the subxip array overflowed? */
	bool		takenDuringRecovery;	/* recovery-shaped snapshot? */
	bool		copied;			/* false if it's a static snapshot */

/*
	 * note: all ids in subxip[] are >= xmin, but we don't bother filtering
	 * out any that are >= xmax
	 */
	CommandId	curcid;			/* in my xact, CID < curcid are visible */
	uint32		active_count;	/* refcount on ActiveSnapshot stack */
	uint32		regd_count;		/* refcount on RegisteredSnapshotList */
} SnapshotData;

/*
 * Result codes for HeapTupleSatisfiesUpdate.  This should really be in
 * tqual.h, but we want to avoid including that file elsewhere.
 */
typedef enum
{
	HeapTupleMayBeUpdated,
	HeapTupleInvisible,
	HeapTupleSelfUpdated,
	HeapTupleUpdated,
	HeapTupleBeingUpdated
} HTSU_Result;

#endif   /* SNAPSHOT_H */