diff options
Diffstat (limited to 'src/include/utils/snapshot.h')
| -rw-r--r-- | src/include/utils/snapshot.h | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/src/include/utils/snapshot.h b/src/include/utils/snapshot.h index 26fb2573c7..a734bf0075 100644 --- a/src/include/utils/snapshot.h +++ b/src/include/utils/snapshot.h @@ -69,31 +69,41 @@ typedef struct SnapshotData * progress, unless the snapshot was taken during recovery in which case * it's empty. For historic MVCC snapshots, the meaning is inverted, i.e. * it contains *committed* transactions between xmin and xmax. + * + * note: all ids in xip[] satisfy xmin <= xip[i] < xmax */ TransactionId *xip; uint32 xcnt; /* # of xact ids in xip[] */ - /* note: all ids in xip[] satisfy xmin <= xip[i] < xmax */ - int32 subxcnt; /* # of xact ids in subxip[] */ /* * For non-historic MVCC snapshots, this contains subxact IDs that are in * progress (and other transactions that are in progress if taken during * recovery). For historic snapshot it contains *all* xids assigned to the * replayed transaction, including the toplevel xid. + * + * note: all ids in subxip[] are >= xmin, but we don't bother filtering + * out any that are >= xmax */ TransactionId *subxip; + int32 subxcnt; /* # of xact ids in subxip[] */ bool suboverflowed; /* has the subxip array overflowed? */ + bool takenDuringRecovery; /* recovery-shaped snapshot? */ bool copied; /* false if it's a static snapshot */ + CommandId curcid; /* in my xact, CID < curcid are visible */ + /* - * note: all ids in subxip[] are >= xmin, but we don't bother filtering - * out any that are >= xmax + * An extra return value for HeapTupleSatisfiesDirty, not used in MVCC + * snapshots. + */ + uint32 speculativeToken; + + /* + * Book-keeping information, used by the snapshot manager */ - CommandId curcid; /* in my xact, CID < curcid are visible */ uint32 active_count; /* refcount on ActiveSnapshot stack */ uint32 regd_count; /* refcount on RegisteredSnapshots */ - pairingheap_node ph_node; /* link in the RegisteredSnapshots heap */ } SnapshotData; |