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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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69
src/include/access/htup.h
View File

@@ -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/htup.h,v 1.65 2004/04/01 21:28:45 tgl Exp $
* $PostgreSQL: pgsql/src/include/access/htup.h,v 1.66 2004/07/01 00:51:38 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -109,18 +109,14 @@
typedef struct HeapTupleFields
{
TransactionId t_xmin; /* inserting xact ID */
union
{
CommandId t_cmin; /* inserting command ID */
TransactionId t_xmax; /* deleting xact ID */
} t_field2;
CommandId t_cmin; /* inserting command ID */
TransactionId t_xmax; /* deleting xact ID */
union
{
CommandId t_cmax; /* deleting command ID */
TransactionId t_xvac; /* VACUUM FULL xact ID */
} t_field3;
} t_field4;
} HeapTupleFields;
typedef struct DatumTupleFields
@@ -172,9 +168,7 @@ typedef HeapTupleHeaderData *HeapTupleHeader;
* attribute(s) */
#define HEAP_HASEXTENDED 0x000C /* the two above combined */
#define HEAP_HASOID 0x0010 /* has an object-id field */
/* bit 0x0020 is presently unused */
#define HEAP_XMAX_IS_XMIN 0x0040 /* created and deleted in the same
* transaction */
/* 0x0020 and 0x0040 are unused */
#define HEAP_XMAX_UNLOGGED 0x0080 /* to lock tuple for update
* without logging */
#define HEAP_XMIN_COMMITTED 0x0100 /* t_xmin committed */
@@ -211,62 +205,47 @@ typedef HeapTupleHeaderData *HeapTupleHeader;
#define HeapTupleHeaderGetXmax(tup) \
( \
((tup)->t_infomask & HEAP_XMAX_IS_XMIN) ? \
(tup)->t_choice.t_heap.t_xmin \
: \
(tup)->t_choice.t_heap.t_field2.t_xmax \
(tup)->t_choice.t_heap.t_xmax \
)
#define HeapTupleHeaderSetXmax(tup, xid) \
do { \
TransactionId _newxid = (xid); \
if (TransactionIdEquals((tup)->t_choice.t_heap.t_xmin, _newxid)) \
(tup)->t_infomask |= HEAP_XMAX_IS_XMIN; \
else \
{ \
(tup)->t_infomask &= ~HEAP_XMAX_IS_XMIN; \
TransactionIdStore(_newxid, &(tup)->t_choice.t_heap.t_field2.t_xmax); \
} \
} while (0)
( \
TransactionIdStore((xid), &(tup)->t_choice.t_heap.t_xmax) \
)
#define HeapTupleHeaderGetCmin(tup) \
( \
(tup)->t_choice.t_heap.t_cmin \
)
#define HeapTupleHeaderSetCmin(tup, cid) \
( \
(tup)->t_choice.t_heap.t_cmin = (cid) \
)
/*
* Note: GetCmin will produce wrong answers after SetXmax has been executed
* Note: GetCmax will produce wrong answers after SetXvac has been executed
* by a transaction other than the inserting one. We could check
* HEAP_XMAX_INVALID and return FirstCommandId if it's clear, but since that
* bit will be set again if the deleting transaction aborts, there'd be no
* real gain in safety from the extra test. So, just rely on the caller not
* to trust the value unless it's meaningful.
*/
#define HeapTupleHeaderGetCmin(tup) \
( \
(tup)->t_choice.t_heap.t_field2.t_cmin \
)
#define HeapTupleHeaderSetCmin(tup, cid) \
do { \
Assert((tup)->t_infomask & HEAP_XMAX_INVALID); \
(tup)->t_choice.t_heap.t_field2.t_cmin = (cid); \
} while (0)
/*
* As with GetCmin, we can't completely ensure that GetCmax can detect whether
* a valid command ID is available, and there's little point in a partial test.
*/
#define HeapTupleHeaderGetCmax(tup) \
( \
(tup)->t_choice.t_heap.t_field3.t_cmax \
(tup)->t_choice.t_heap.t_field4.t_cmax \
)
#define HeapTupleHeaderSetCmax(tup, cid) \
do { \
Assert(!((tup)->t_infomask & HEAP_MOVED)); \
(tup)->t_choice.t_heap.t_field3.t_cmax = (cid); \
(tup)->t_choice.t_heap.t_field4.t_cmax = (cid); \
} while (0)
#define HeapTupleHeaderGetXvac(tup) \
( \
((tup)->t_infomask & HEAP_MOVED) ? \
(tup)->t_choice.t_heap.t_field3.t_xvac \
(tup)->t_choice.t_heap.t_field4.t_xvac \
: \
InvalidTransactionId \
)
@@ -274,7 +253,7 @@ do { \
#define HeapTupleHeaderSetXvac(tup, xid) \
do { \
Assert((tup)->t_infomask & HEAP_MOVED); \
TransactionIdStore((xid), &(tup)->t_choice.t_heap.t_field3.t_xvac); \
TransactionIdStore((xid), &(tup)->t_choice.t_heap.t_field4.t_xvac); \
} while (0)
#define HeapTupleHeaderGetDatumLength(tup) \