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Move xact.c's partial support for Lists of TransactionIds into pg_list.h.

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Needed because lock.c is now going to use the same type of list.
This commit is contained in:
Tom Lane 2006-08-27 19:11:46 +00:00
parent 99a5619e7b
commit ca1fd0ea5b
2 changed files with 13 additions and 10 deletions
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10
src/backend/access/transam/xact.c
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@ -10,7 +10,7 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/transam/xact.c,v 1.225 2006/07/30 02:07:18 alvherre Exp $ * $PostgreSQL: pgsql/src/backend/access/transam/xact.c,v 1.226 2006/08/27 19:11:46 tgl Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -125,14 +125,6 @@ typedef struct TransactionStateData
typedef TransactionStateData *TransactionState; typedef TransactionStateData *TransactionState;
/*
* childXids is currently implemented as an Oid List, relying on the
* assumption that TransactionIds are no wider than Oid. We use these
* macros to provide some isolation in case that changes in the future.
*/
#define lfirst_xid(lc) ((TransactionId) lfirst_oid(lc))
#define lappend_xid(list, datum) lappend_oid(list, (Oid) (datum))
/* /*
* CurrentTransactionState always points to the current transaction state * CurrentTransactionState always points to the current transaction state
* block. It will point to TopTransactionStateData when not in a * block. It will point to TopTransactionStateData when not in a

13
src/include/nodes/pg_list.h
View File

@ -26,11 +26,16 @@
* (At the moment, ints and Oids are the same size, but they may not * (At the moment, ints and Oids are the same size, but they may not
* always be so; try to be careful to maintain the distinction.) * always be so; try to be careful to maintain the distinction.)
* *
* There is also limited support for lists of TransactionIds; since these
* are used in only one or two places, we don't provide a full implementation,
* but map them onto Oid lists. This effectively assumes that TransactionId
* is no wider than Oid and both are unsigned types.
*
* *
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group * Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California * Portions Copyright (c) 1994, Regents of the University of California
* *
* $PostgreSQL: pgsql/src/include/nodes/pg_list.h,v 1.54 2006/03/05 15:58:57 momjian Exp $ * $PostgreSQL: pgsql/src/include/nodes/pg_list.h,v 1.55 2006/08/27 19:11:46 tgl Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -154,6 +159,12 @@ extern int list_length(List *l);
#define list_make3_oid(x1,x2,x3) lcons_oid(x1, list_make2_oid(x2, x3)) #define list_make3_oid(x1,x2,x3) lcons_oid(x1, list_make2_oid(x2, x3))
#define list_make4_oid(x1,x2,x3,x4) lcons_oid(x1, list_make3_oid(x2, x3, x4)) #define list_make4_oid(x1,x2,x3,x4) lcons_oid(x1, list_make3_oid(x2, x3, x4))
/*
* Limited support for lists of TransactionIds, mapped onto lists of Oids
*/
#define lfirst_xid(lc) ((TransactionId) lfirst_oid(lc))
#define lappend_xid(list, datum) lappend_oid(list, (Oid) (datum))
/* /*
* foreach - * foreach -
* a convenience macro which loops through the list * a convenience macro which loops through the list