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Ensure that all TransactionId comparisons are encapsulated in macros

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(TransactionIdPrecedes, TransactionIdFollows, etc).  First step on the
way to transaction ID wrap solution ...
This commit is contained in:
Tom Lane
2001-08-23 23:06:38 +00:00
parent 29ec29ffac
commit 7326e78c42
17 changed files with 139 additions and 100 deletions
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40
src/include/access/transam.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: transam.h,v 1.37 2001/08/10 18:57:39 tgl Exp $
* $Id: transam.h,v 1.38 2001/08/23 23:06:38 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -24,29 +24,37 @@
* 128 bytes of pg_log available for special purposes such as version number
* storage. (Currently, we do not actually use them for anything.)
*
* AmiTransactionId is the XID for "bootstrap" operations. It should always
* be considered valid.
* BootstrapTransactionId is the XID for "bootstrap" operations. It should
* always be considered valid.
*
* FirstTransactionId is the first "normal" transaction id.
* FirstNormalTransactionId is the first "normal" transaction id.
* ----------------
*/
#define NullTransactionId ((TransactionId) 0)
#define DisabledTransactionId ((TransactionId) 1)
#define AmiTransactionId ((TransactionId) 512)
#define FirstTransactionId ((TransactionId) 514)
#define InvalidTransactionId ((TransactionId) 0)
#define DisabledTransactionId ((TransactionId) 1)
#define BootstrapTransactionId ((TransactionId) 512)
#define FirstNormalTransactionId ((TransactionId) 514)
/* ----------------
* transaction ID manipulation macros
* ----------------
*/
#define TransactionIdIsValid(xid) ((bool) ((xid) != NullTransactionId))
#define TransactionIdIsSpecial(xid) ((bool) ((xid) < FirstTransactionId))
#define TransactionIdEquals(id1, id2) ((bool) ((id1) == (id2)))
#define TransactionIdPrecedes(id1, id2) ((bool) ((id1) < (id2)))
#define TransactionIdStore(xid, dest) \
(*((TransactionId*) (dest)) = (TransactionId) (xid))
#define StoreInvalidTransactionId(dest) \
(*((TransactionId*) (dest)) = NullTransactionId)
#define TransactionIdIsValid(xid) ((xid) != InvalidTransactionId)
#define TransactionIdIsNormal(xid) ((xid) >= FirstNormalTransactionId)
#define TransactionIdEquals(id1, id2) ((id1) == (id2))
#define TransactionIdPrecedes(id1, id2) ((id1) < (id2))
#define TransactionIdPrecedesOrEquals(id1, id2) ((id1) <= (id2))
#define TransactionIdFollows(id1, id2) ((id1) > (id2))
#define TransactionIdFollowsOrEquals(id1, id2) ((id1) >= (id2))
#define TransactionIdStore(xid, dest) (*(dest) = (xid))
#define StoreInvalidTransactionId(dest) (*(dest) = InvalidTransactionId)
/* advance a transaction ID variable, handling wraparound correctly */
#define TransactionIdAdvance(dest) \
do { \
(dest)++; \
if ((dest) < FirstNormalTransactionId) \
(dest) = FirstNormalTransactionId; \
} while(0)
/* ----------------
* transaction status values