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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2001-08-26 16:56:03 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2001-08-26 16:56:03 +0000 |
| commit | bc7d37a525c02f4a0e983854c4222e9d063eeae2 (patch) | |
| tree | 46d1ff8c74eb0a6cec5c183732410a1b846fc5ba /src/include/access/transam.h | |
| parent | d1ee78f2962f09f0fe7c6c8ee16ad513ac113ba4 (diff) | |
| download | postgresql-bc7d37a525c02f4a0e983854c4222e9d063eeae2.tar.gz postgresql-bc7d37a525c02f4a0e983854c4222e9d063eeae2.zip | |
Transaction IDs wrap around, per my proposal of 13-Aug-01. More
documentation to come, but the code is all here. initdb forced.
Diffstat (limited to 'src/include/access/transam.h')
| -rw-r--r-- | src/include/access/transam.h | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/src/include/access/transam.h b/src/include/access/transam.h index f0d213361ac..5ce62d289f9 100644 --- a/src/include/access/transam.h +++ b/src/include/access/transam.h @@ -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 1.39 2001/08/25 18:52:42 tgl Exp $ + * $Id: transam.h,v 1.40 2001/08/26 16:56:00 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -31,6 +31,7 @@ #define BootstrapTransactionId ((TransactionId) 1) #define FrozenTransactionId ((TransactionId) 2) #define FirstNormalTransactionId ((TransactionId) 3) +#define MaxTransactionId ((TransactionId) 0xFFFFFFFF) /* ---------------- * transaction ID manipulation macros @@ -38,11 +39,7 @@ */ #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 TransactionIdEquals(id1, id2) ((id1) == (id2)) #define TransactionIdStore(xid, dest) (*(dest) = (xid)) #define StoreInvalidTransactionId(dest) (*(dest) = InvalidTransactionId) /* advance a transaction ID variable, handling wraparound correctly */ @@ -105,6 +102,10 @@ extern bool TransactionIdDidCommit(TransactionId transactionId); extern bool TransactionIdDidAbort(TransactionId transactionId); extern void TransactionIdCommit(TransactionId transactionId); extern void TransactionIdAbort(TransactionId transactionId); +extern bool TransactionIdPrecedes(TransactionId id1, TransactionId id2); +extern bool TransactionIdPrecedesOrEquals(TransactionId id1, TransactionId id2); +extern bool TransactionIdFollows(TransactionId id1, TransactionId id2); +extern bool TransactionIdFollowsOrEquals(TransactionId id1, TransactionId id2); /* in transam/varsup.c */ extern TransactionId GetNewTransactionId(void); |