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Name	Size	Permission
attnum.h	1.52 KB	-rw-r--r--
clog.h	1.47 KB	-rw-r--r--
genam.h	7.3 KB	-rw-r--r--
gin.h	1.63 KB	-rw-r--r--
gin_private.h	22.87 KB	-rw-r--r--
gist.h	6.65 KB	-rw-r--r--
gist_private.h	19.09 KB	-rw-r--r--
gistscan.h	718 B	-rw-r--r--
hash.h	12.87 KB	-rw-r--r--
heapam.h	6.25 KB	-rw-r--r--
hio.h	1.25 KB	-rw-r--r--
htup.h	32.13 KB	-rw-r--r--
itup.h	4.3 KB	-rw-r--r--
multixact.h	2.83 KB	-rw-r--r--
nbtree.h	27.43 KB	-rw-r--r--
printtup.h	1.03 KB	-rw-r--r--
reloptions.h	8.61 KB	-rw-r--r--
relscan.h	4.07 KB	-rw-r--r--
rewriteheap.h	1016 B	-rw-r--r--
rmgr.h	804 B	-rw-r--r--
sdir.h	1.43 KB	-rw-r--r--
skey.h	6.87 KB	-rw-r--r--
slru.h	5.16 KB	-rw-r--r--
spgist.h	6.24 KB	-rw-r--r--
spgist_private.h	22.11 KB	-rw-r--r--
subtrans.h	973 B	-rw-r--r--
sysattr.h	891 B	-rw-r--r--
transam.h	6.02 KB	-rw-r--r--
tupconvert.h	1.26 KB	-rw-r--r--
tupdesc.h	4.25 KB	-rw-r--r--
tupmacs.h	7.16 KB	-rw-r--r--
tuptoaster.h	5.52 KB	-rw-r--r--
twophase.h	1.75 KB	-rw-r--r--
twophase_rmgr.h	1.24 KB	-rw-r--r--
valid.h	1.4 KB	-rw-r--r--
visibilitymap.h	1.15 KB	-rw-r--r--
xact.h	8.44 KB	-rw-r--r--
xlog.h	12.43 KB	-rw-r--r--
xlog_internal.h	9.34 KB	-rw-r--r--
xlogdefs.h	4.49 KB	-rw-r--r--
xlogutils.h	956 B	-rw-r--r--

Code Editor : xact.h

/*-------------------------------------------------------------------------
 *
 * xact.h
 *	  postgres transaction system definitions
 *
 *
 * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/access/xact.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef XACT_H
#define XACT_H

#include "access/xlog.h"
#include "nodes/pg_list.h"
#include "storage/relfilenode.h"

/*
 * Xact isolation levels
 */
#define XACT_READ_UNCOMMITTED	0
#define XACT_READ_COMMITTED		1
#define XACT_REPEATABLE_READ	2
#define XACT_SERIALIZABLE		3

extern int	DefaultXactIsoLevel;
extern int	XactIsoLevel;

/*
 * We implement three isolation levels internally.
 * The two stronger ones use one snapshot per database transaction;
 * the others use one snapshot per statement.
 * Serializable uses predicate locks in addition to snapshots.
 * These macros should be used to check which isolation level is selected.
 */
#define IsolationUsesXactSnapshot() (XactIsoLevel >= XACT_REPEATABLE_READ)
#define IsolationIsSerializable() (XactIsoLevel == XACT_SERIALIZABLE)

/* Xact read-only state */
extern bool DefaultXactReadOnly;
extern bool XactReadOnly;

/*
 * Xact is deferrable -- only meaningful (currently) for read only
 * SERIALIZABLE transactions
 */
extern bool DefaultXactDeferrable;
extern bool XactDeferrable;

typedef enum
{
	SYNCHRONOUS_COMMIT_OFF,		/* asynchronous commit */
	SYNCHRONOUS_COMMIT_LOCAL_FLUSH,		/* wait for local flush only */
	SYNCHRONOUS_COMMIT_REMOTE_WRITE,	/* wait for local flush and remote
										 * write */
	SYNCHRONOUS_COMMIT_REMOTE_FLUSH		/* wait for local and remote flush */
}	SyncCommitLevel;

/* Define the default setting for synchronous_commit */
#define SYNCHRONOUS_COMMIT_ON	SYNCHRONOUS_COMMIT_REMOTE_FLUSH

/* Synchronous commit level */
extern int	synchronous_commit;

/* Kluge for 2PC support */
extern bool MyXactAccessedTempRel;

/*
 *	start- and end-of-transaction callbacks for dynamically loaded modules
 */
typedef enum
{
	XACT_EVENT_COMMIT,
	XACT_EVENT_ABORT,
	XACT_EVENT_PREPARE
} XactEvent;

typedef void (*XactCallback) (XactEvent event, void *arg);

typedef enum
{
	SUBXACT_EVENT_START_SUB,
	SUBXACT_EVENT_COMMIT_SUB,
	SUBXACT_EVENT_ABORT_SUB
} SubXactEvent;

typedef void (*SubXactCallback) (SubXactEvent event, SubTransactionId mySubid,
									SubTransactionId parentSubid, void *arg);

/* ----------------
 *		transaction-related XLOG entries
 * ----------------
 */

/*
 * XLOG allows to store some information in high 4 bits of log
 * record xl_info field
 */
#define XLOG_XACT_COMMIT			0x00
#define XLOG_XACT_PREPARE			0x10
#define XLOG_XACT_ABORT				0x20
#define XLOG_XACT_COMMIT_PREPARED	0x30
#define XLOG_XACT_ABORT_PREPARED	0x40
#define XLOG_XACT_ASSIGNMENT		0x50
#define XLOG_XACT_COMMIT_COMPACT	0x60

typedef struct xl_xact_assignment
{
	TransactionId xtop;			/* assigned XID's top-level XID */
	int			nsubxacts;		/* number of subtransaction XIDs */
	TransactionId xsub[1];		/* assigned subxids */
} xl_xact_assignment;

#define MinSizeOfXactAssignment offsetof(xl_xact_assignment, xsub)

typedef struct xl_xact_commit_compact
{
	TimestampTz xact_time;		/* time of commit */
	int			nsubxacts;		/* number of subtransaction XIDs */
	/* ARRAY OF COMMITTED SUBTRANSACTION XIDs FOLLOWS */
	TransactionId subxacts[1];	/* VARIABLE LENGTH ARRAY */
} xl_xact_commit_compact;

#define MinSizeOfXactCommitCompact offsetof(xl_xact_commit_compact, subxacts)

typedef struct xl_xact_commit
{
	TimestampTz xact_time;		/* time of commit */
	uint32		xinfo;			/* info flags */
	int			nrels;			/* number of RelFileNodes */
	int			nsubxacts;		/* number of subtransaction XIDs */
	int			nmsgs;			/* number of shared inval msgs */
	Oid			dbId;			/* MyDatabaseId */
	Oid			tsId;			/* MyDatabaseTableSpace */
	/* Array of RelFileNode(s) to drop at commit */
	RelFileNode xnodes[1];		/* VARIABLE LENGTH ARRAY */
	/* ARRAY OF COMMITTED SUBTRANSACTION XIDs FOLLOWS */
	/* ARRAY OF SHARED INVALIDATION MESSAGES FOLLOWS */
} xl_xact_commit;

#define MinSizeOfXactCommit offsetof(xl_xact_commit, xnodes)

/*
 * These flags are set in the xinfo fields of WAL commit records,
 * indicating a variety of additional actions that need to occur
 * when emulating transaction effects during recovery.
 * They are named XactCompletion... to differentiate them from
 * EOXact... routines which run at the end of the original
 * transaction completion.
 */
#define XACT_COMPLETION_UPDATE_RELCACHE_FILE	0x01
#define XACT_COMPLETION_FORCE_SYNC_COMMIT		0x02

/* Access macros for above flags */
#define XactCompletionRelcacheInitFileInval(xinfo)	(xinfo & XACT_COMPLETION_UPDATE_RELCACHE_FILE)
#define XactCompletionForceSyncCommit(xinfo)		(xinfo & XACT_COMPLETION_FORCE_SYNC_COMMIT)

typedef struct xl_xact_abort
{
	TimestampTz xact_time;		/* time of abort */
	int			nrels;			/* number of RelFileNodes */
	int			nsubxacts;		/* number of subtransaction XIDs */
	/* Array of RelFileNode(s) to drop at abort */
	RelFileNode xnodes[1];		/* VARIABLE LENGTH ARRAY */
	/* ARRAY OF ABORTED SUBTRANSACTION XIDs FOLLOWS */
} xl_xact_abort;

/* Note the intentional lack of an invalidation message array c.f. commit */

#define MinSizeOfXactAbort offsetof(xl_xact_abort, xnodes)

/*
 * COMMIT_PREPARED and ABORT_PREPARED are identical to COMMIT/ABORT records
 * except that we have to store the XID of the prepared transaction explicitly
 * --- the XID in the record header will be invalid.
 */

typedef struct xl_xact_commit_prepared
{
	TransactionId xid;			/* XID of prepared xact */
	xl_xact_commit crec;		/* COMMIT record */
	/* MORE DATA FOLLOWS AT END OF STRUCT */
} xl_xact_commit_prepared;

#define MinSizeOfXactCommitPrepared offsetof(xl_xact_commit_prepared, crec.xnodes)

typedef struct xl_xact_abort_prepared
{
	TransactionId xid;			/* XID of prepared xact */
	xl_xact_abort arec;			/* ABORT record */
	/* MORE DATA FOLLOWS AT END OF STRUCT */
} xl_xact_abort_prepared;

#define MinSizeOfXactAbortPrepared offsetof(xl_xact_abort_prepared, arec.xnodes)

/* ----------------
 *		extern definitions
 * ----------------
 */
extern bool IsTransactionState(void);
extern bool IsAbortedTransactionBlockState(void);
extern TransactionId GetTopTransactionId(void);
extern TransactionId GetTopTransactionIdIfAny(void);
extern TransactionId GetCurrentTransactionId(void);
extern TransactionId GetCurrentTransactionIdIfAny(void);
extern TransactionId GetStableLatestTransactionId(void);
extern SubTransactionId GetCurrentSubTransactionId(void);
extern bool SubTransactionIsActive(SubTransactionId subxid);
extern CommandId GetCurrentCommandId(bool used);
extern TimestampTz GetCurrentTransactionStartTimestamp(void);
extern TimestampTz GetCurrentStatementStartTimestamp(void);
extern TimestampTz GetCurrentTransactionStopTimestamp(void);
extern void SetCurrentStatementStartTimestamp(void);
extern int	GetCurrentTransactionNestLevel(void);
extern bool TransactionIdIsCurrentTransactionId(TransactionId xid);
extern void CommandCounterIncrement(void);
extern void ForceSyncCommit(void);
extern void StartTransactionCommand(void);
extern void CommitTransactionCommand(void);
extern void AbortCurrentTransaction(void);
extern void BeginTransactionBlock(void);
extern bool EndTransactionBlock(void);
extern bool PrepareTransactionBlock(char *gid);
extern void UserAbortTransactionBlock(void);
extern void ReleaseSavepoint(List *options);
extern void DefineSavepoint(char *name);
extern void RollbackToSavepoint(List *options);
extern void BeginInternalSubTransaction(char *name);
extern void ReleaseCurrentSubTransaction(void);
extern void RollbackAndReleaseCurrentSubTransaction(void);
extern bool IsSubTransaction(void);
extern bool IsTransactionBlock(void);
extern bool IsTransactionOrTransactionBlock(void);
extern char TransactionBlockStatusCode(void);
extern void AbortOutOfAnyTransaction(void);
extern void PreventTransactionChain(bool isTopLevel, const char *stmtType);
extern void RequireTransactionChain(bool isTopLevel, const char *stmtType);
extern bool IsInTransactionChain(bool isTopLevel);
extern void RegisterXactCallback(XactCallback callback, void *arg);
extern void UnregisterXactCallback(XactCallback callback, void *arg);
extern void RegisterSubXactCallback(SubXactCallback callback, void *arg);
extern void UnregisterSubXactCallback(SubXactCallback callback, void *arg);

extern int	xactGetCommittedChildren(TransactionId **ptr);

extern void xact_redo(XLogRecPtr lsn, XLogRecord *record);
extern void xact_desc(StringInfo buf, uint8 xl_info, char *rec);

#endif   /* XACT_H */

${this.title}

Code Editor : xact.h