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Nested transactions. There is still much left to do, especially on the

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performance front, but with feature freeze upon us I think it's time to
drive a stake in the ground and say that this will be in 7.5.

Alvaro Herrera, with some help from Tom Lane.
This commit is contained in:
Tom Lane
2004-07-01 00:52:04 +00:00
parent 4c9aa572fa
commit 573a71a5da
74 changed files with 4516 additions and 1144 deletions
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41
src/include/access/xact.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/xact.h,v 1.63 2004/05/22 23:14:38 tgl Exp $
* $PostgreSQL: pgsql/src/include/access/xact.h,v 1.64 2004/07/01 00:51:38 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -63,7 +63,15 @@ typedef enum TBlockState
TBLOCK_INPROGRESS,
TBLOCK_END,
TBLOCK_ABORT,
TBLOCK_ENDABORT
TBLOCK_ENDABORT,
TBLOCK_SUBBEGIN,
TBLOCK_SUBBEGINABORT,
TBLOCK_SUBINPROGRESS,
TBLOCK_SUBEND,
TBLOCK_SUBABORT,
TBLOCK_SUBENDABORT_OK,
TBLOCK_SUBENDABORT_ERROR
} TBlockState;
/*
@ -76,12 +84,15 @@ typedef void (*EOXactCallback) (bool isCommit, void *arg);
*/
typedef struct TransactionStateData
{
TransactionId transactionIdData;
CommandId commandId;
AbsoluteTime startTime;
int startTimeUsec;
TransState state;
TBlockState blockState;
TransactionId transactionIdData; /* my XID */
CommandId commandId; /* current CID */
TransState state; /* low-level state */
TBlockState blockState; /* high-level state */
int nestingLevel; /* nest depth */
MemoryContext curTransactionContext; /* my xact-lifetime context */
List *childXids; /* subcommitted child XIDs */
AclId currentUser; /* subxact start current_user */
struct TransactionStateData *parent; /* back link to parent */
} TransactionStateData;
typedef TransactionStateData *TransactionState;
@ -102,9 +113,11 @@ typedef TransactionStateData *TransactionState;
typedef struct xl_xact_commit
{
time_t xtime;
int nrels; /* number of RelFileNodes */
int nsubxacts; /* number of subtransaction XIDs */
/* Array of RelFileNode(s) to drop at commit */
/* The XLOG record length determines how many there are */
RelFileNode xnodes[1]; /* VARIABLE LENGTH ARRAY */
/* ARRAY OF COMMITTED SUBTRANSACTION XIDs FOLLOWS */
} xl_xact_commit;
#define MinSizeOfXactCommit offsetof(xl_xact_commit, xnodes)
@ -112,9 +125,11 @@ typedef struct xl_xact_commit
typedef struct xl_xact_abort
{
time_t xtime;
int nrels; /* number of RelFileNodes */
int nsubxacts; /* number of subtransaction XIDs */
/* Array of RelFileNode(s) to drop at abort */
/* The XLOG record length determines how many there are */
RelFileNode xnodes[1]; /* VARIABLE LENGTH ARRAY */
/* ARRAY OF ABORTED SUBTRANSACTION XIDs FOLLOWS */
} xl_xact_abort;
#define MinSizeOfXactAbort offsetof(xl_xact_abort, xnodes)
@ -126,18 +141,20 @@ typedef struct xl_xact_abort
*/
extern bool IsTransactionState(void);
extern bool IsAbortedTransactionBlockState(void);
extern TransactionId GetTopTransactionId(void);
extern TransactionId GetCurrentTransactionId(void);
extern CommandId GetCurrentCommandId(void);
extern AbsoluteTime GetCurrentTransactionStartTime(void);
extern AbsoluteTime GetCurrentTransactionStartTimeUsec(int *usec);
extern int GetCurrentTransactionNestLevel(void);
extern bool TransactionIdIsCurrentTransactionId(TransactionId xid);
extern bool CommandIdIsCurrentCommandId(CommandId cid);
extern void CommandCounterIncrement(void);
extern void StartTransactionCommand(void);
extern void CommitTransactionCommand(void);
extern void AbortCurrentTransaction(void);
extern void BeginTransactionBlock(void);
extern void EndTransactionBlock(void);
extern bool IsSubTransaction(void);
extern bool IsTransactionBlock(void);
extern bool IsTransactionOrTransactionBlock(void);
extern char TransactionBlockStatusCode(void);
@ -151,6 +168,8 @@ extern void UnregisterEOXactCallback(EOXactCallback callback, void *arg);
extern void RecordTransactionCommit(void);
extern int xactGetCommittedChildren(TransactionId **ptr, bool metoo);
extern void XactPushRollback(void (*func) (void *), void *data);
extern void XactPopRollback(void);