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| author | Thomas Munro <tmunro@postgresql.org> | 2019-03-28 10:59:19 +1300 |
|---|---|---|
| committer | Thomas Munro <tmunro@postgresql.org> | 2019-03-28 18:24:43 +1300 |
| commit | ad308058cc8666c50b43179e64d6bb7aeb3ba169 (patch) | |
| tree | bf8c6e0f7d056eba1fa182e26c53dda7e0e72377 /src/include/access/transam.h | |
| parent | 2fc7af5e966043a412e8e69c135fae55a2db6d4f (diff) | |
| download | postgresql-ad308058cc8666c50b43179e64d6bb7aeb3ba169.tar.gz postgresql-ad308058cc8666c50b43179e64d6bb7aeb3ba169.zip | |
Use FullTransactionId for the transaction stack.
Provide GetTopFullTransactionId() and GetCurrentFullTransactionId().
The intended users of these interfaces are access methods that use
xids for visibility checks but don't want to have to go back and
"freeze" existing references some time later before the 32 bit xid
counter wraps around.
Use a new struct to serialize the transaction state for parallel
query, because FullTransactionId doesn't fit into the previous
serialization scheme very well.
Author: Thomas Munro
Reviewed-by: Heikki Linnakangas
Discussion: https://postgr.es/m/CAA4eK1%2BMv%2Bmb0HFfWM9Srtc6MVe160WFurXV68iAFMcagRZ0dQ%40mail.gmail.com
Diffstat (limited to 'src/include/access/transam.h')
| -rw-r--r-- | src/include/access/transam.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/include/access/transam.h b/src/include/access/transam.h index 6a919084c8f..7966a9e90ba 100644 --- a/src/include/access/transam.h +++ b/src/include/access/transam.h @@ -49,6 +49,7 @@ #define U64FromFullTransactionId(x) ((x).value) #define FullTransactionIdPrecedes(a, b) ((a).value < (b).value) #define FullTransactionIdIsValid(x) TransactionIdIsValid(XidFromFullTransactionId(x)) +#define InvalidFullTransactionId FullTransactionIdFromEpochAndXid(0, InvalidTransactionId) /* * A 64 bit value that contains an epoch and a TransactionId. This is @@ -221,7 +222,7 @@ extern TransactionId TransactionIdLatest(TransactionId mainxid, extern XLogRecPtr TransactionIdGetCommitLSN(TransactionId xid); /* in transam/varsup.c */ -extern TransactionId GetNewTransactionId(bool isSubXact); +extern FullTransactionId GetNewTransactionId(bool isSubXact); extern void AdvanceNextFullTransactionIdPastXid(TransactionId xid); extern FullTransactionId ReadNextFullTransactionId(void); extern void SetTransactionIdLimit(TransactionId oldest_datfrozenxid, |