diff options
Diffstat (limited to 'src/include/access/transam.h')
| -rw-r--r-- | src/include/access/transam.h | 40 |
1 files changed, 24 insertions, 16 deletions
diff --git a/src/include/access/transam.h b/src/include/access/transam.h index 9a872278ad7..3833d97821a 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 1.37 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 |