init
This commit is contained in:
blue-lemon0104
256
pg_include/access/xact.h
Executable file
256
pg_include/access/xact.h
Executable file
@@ -0,0 +1,256 @@
|
||||
/*-------------------------------------------------------------------------
|
||||
*
|
||||
* 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 synchonous_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 for the transaction doing the
|
||||
* COMMIT PREPARED or ABORT PREPARED command.
|
||||
*/
|
||||
|
||||
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 */
|
||||
Reference in New Issue
Block a user