diff options
Diffstat (limited to 'src/include/utils/tqual.h')
| -rw-r--r-- | src/include/utils/tqual.h | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/src/include/utils/tqual.h b/src/include/utils/tqual.h index ab14efb52e2..8775eaf9aac 100644 --- a/src/include/utils/tqual.h +++ b/src/include/utils/tqual.h @@ -3,10 +3,11 @@ * tqual.h-- * POSTGRES "time" qualification definitions. * + * Should be moved/renamed... - vadim 07/28/98 * * Copyright (c) 1994, Regents of the University of California * - * $Id: tqual.h,v 1.12 1998/04/24 14:43:33 momjian Exp $ + * $Id: tqual.h,v 1.13 1998/07/27 19:38:40 vadim Exp $ * *------------------------------------------------------------------------- */ @@ -15,6 +16,20 @@ #include <access/htup.h> +typedef struct SnapshotData +{ + TransactionId xmin; /* XID < xmin are visible to me */ + TransactionId xmax; /* XID > xmax are invisible to me */ + TransactionId *xip; /* array of xacts in progress */ +} SnapshotData; + +typedef SnapshotData *Snapshot; + +#define IsSnapshotNow(snapshot) ((Snapshot) snapshot == (Snapshot) 0x0) +#define IsSnapshotSelf(snapshot) ((Snapshot) snapshot == (Snapshot) 0x1) +#define SnapshotNow ((Snapshot) 0x0) +#define SnapshotSelf ((Snapshot) 0x1) + extern TransactionId HeapSpecialTransactionId; extern CommandId HeapSpecialCommandId; @@ -25,13 +40,13 @@ extern CommandId HeapSpecialCommandId; * Note: * Assumes heap tuple is valid. */ -#define HeapTupleSatisfiesVisibility(tuple, seeself) \ +#define HeapTupleSatisfiesVisibility(tuple, snapshot) \ ( \ TransactionIdEquals((tuple)->t_xmax, AmiTransactionId) ? \ false \ : \ ( \ - ((seeself) == true || heapisoverride()) ? \ + (IsSnapshotSelf(snapshot) || heapisoverride()) ? \ HeapTupleSatisfiesItself(tuple) \ : \ HeapTupleSatisfiesNow(tuple) \ |