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Initial MVCC code.

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New code for locking buffer' context.
This commit is contained in:
Vadim B. Mikheev
1998-12-15 12:47:01 +00:00
parent c5a27161a1
commit 3f7fbf85dc
65 changed files with 1391 additions and 1282 deletions
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35
src/include/utils/tqual.h
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@@ -7,7 +7,7 @@
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: tqual.h,v 1.15 1998/11/27 19:33:35 vadim Exp $
* $Id: tqual.h,v 1.16 1998/12/15 12:47:01 vadim Exp $
*
*-------------------------------------------------------------------------
*/
@@ -18,17 +18,20 @@
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 */
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 Snapshot SnapshotDirty;
#define IsSnapshotNow(snapshot) ((Snapshot) snapshot == SnapshotNow)
#define IsSnapshotSelf(snapshot) ((Snapshot) snapshot == SnapshotSelf)
#define IsSnapshotDirty(snapshot) ((Snapshot) snapshot == SnapshotDirty)
extern TransactionId HeapSpecialTransactionId;
extern CommandId HeapSpecialCommandId;
@@ -49,7 +52,11 @@ extern CommandId HeapSpecialCommandId;
(IsSnapshotSelf(snapshot) || heapisoverride()) ? \
HeapTupleSatisfiesItself((tuple)->t_data) \
: \
HeapTupleSatisfiesNow((tuple)->t_data) \
((IsSnapshotDirty(snapshot)) ? \
HeapTupleSatisfiesDirty((tuple)->t_data) \
: \
HeapTupleSatisfiesNow((tuple)->t_data) \
) \
) \
)
@@ -71,10 +78,18 @@ extern CommandId HeapSpecialCommandId;
) \
)
extern bool HeapTupleSatisfiesItself(HeapTupleHeader tuple);
extern bool HeapTupleSatisfiesNow(HeapTupleHeader tuple);
#define HeapTupleMayBeUpdated 0
#define HeapTupleInvisible 1
#define HeapTupleSelfUpdated 2
#define HeapTupleUpdated 3
#define HeapTupleBeingUpdated 4
extern bool HeapTupleSatisfiesItself(HeapTupleHeader tuple);
extern bool HeapTupleSatisfiesNow(HeapTupleHeader tuple);
extern bool HeapTupleSatisfiesDirty(HeapTupleHeader tuple);
extern int HeapTupleSatisfiesUpdate(HeapTuple tuple);
extern void setheapoverride(bool on);
extern Snapshot GetSnapshotData(bool serialized);
#endif /* TQUAL_H */