diff options
Diffstat (limited to 'src/include/utils/snapshot.h')
| -rw-r--r-- | src/include/utils/snapshot.h | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/src/include/utils/snapshot.h b/src/include/utils/snapshot.h index 8ee9285c55b..d8e8b351ed2 100644 --- a/src/include/utils/snapshot.h +++ b/src/include/utils/snapshot.h @@ -28,7 +28,7 @@ typedef struct SnapshotData *Snapshot; * function. */ typedef bool (*SnapshotSatisfiesFunc) (HeapTuple htup, - Snapshot snapshot, Buffer buffer); + Snapshot snapshot, Buffer buffer); /* * Struct representing all kind of possible snapshots. @@ -39,7 +39,7 @@ typedef bool (*SnapshotSatisfiesFunc) (HeapTuple htup, * * Historic MVCC snapshots used during logical decoding * * snapshots passed to HeapTupleSatisfiesDirty() * * snapshots used for SatisfiesAny, Toast, Self where no members are - * accessed. + * accessed. * * TODO: It's probably a good idea to split this struct using a NodeTag * similar to how parser and executor nodes are handled, with one type for @@ -62,16 +62,18 @@ typedef struct SnapshotData */ TransactionId xmin; /* all XID < xmin are visible to me */ TransactionId xmax; /* all XID >= xmax are invisible to me */ + /* * For normal MVCC snapshot this contains the all xact IDs that are in * 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. + * it's empty. For historic MVCC snapshots, the meaning is inverted, i.e. + * it contains *committed* transactions between xmin and 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 |