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Code Activity

Rename ShmemVariableCache to TransamVariables

Browse Source 
The old name was misleading: It's not a cache, the values kept in the
struct are the authoritative source.

Reviewed-by: Tristan Partin, Richard Guo
Discussion: https://www.postgresql.org/message-id/6537d63d-4bb5-46f8-9b5d-73a8ba4720ab@iki.fi
This commit is contained in:
Heikki Linnakangas
2023-12-08 09:47:15 +02:00
parent 15916ffb04
commit b31ba5310b
18 changed files with 172 additions and 175 deletions
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12
src/backend/access/transam/twophase.c
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@@ -958,7 +958,7 @@ AdjustToFullTransactionId(TransactionId xid)
Assert(TransactionIdIsValid(xid));
LWLockAcquire(XidGenLock, LW_SHARED);
nextFullXid = ShmemVariableCache->nextXid;
nextFullXid = TransamVariables->nextXid;
LWLockRelease(XidGenLock);
nextXid = XidFromFullTransactionId(nextFullXid);
@@ -1948,7 +1948,7 @@ restoreTwoPhaseData(void)
*
* Scan the shared memory entries of TwoPhaseState and determine the range
* of valid XIDs present. This is run during database startup, after we
* have completed reading WAL. ShmemVariableCache->nextXid has been set to
* have completed reading WAL. TransamVariables->nextXid has been set to
* one more than the highest XID for which evidence exists in WAL.
*
* We throw away any prepared xacts with main XID beyond nextXid --- if any
@@ -1967,7 +1967,7 @@ restoreTwoPhaseData(void)
* backup should be rolled in.
*
* Our other responsibility is to determine and return the oldest valid XID
* among the prepared xacts (if none, return ShmemVariableCache->nextXid).
* among the prepared xacts (if none, return TransamVariables->nextXid).
* This is needed to synchronize pg_subtrans startup properly.
*
* If xids_p and nxids_p are not NULL, pointer to a palloc'd array of all
@@ -1977,7 +1977,7 @@ restoreTwoPhaseData(void)
TransactionId
PrescanPreparedTransactions(TransactionId **xids_p, int *nxids_p)
{
FullTransactionId nextXid = ShmemVariableCache->nextXid;
FullTransactionId nextXid = TransamVariables->nextXid;
TransactionId origNextXid = XidFromFullTransactionId(nextXid);
TransactionId result = origNextXid;
TransactionId *xids = NULL;
@@ -2196,7 +2196,7 @@ RecoverPreparedTransactions(void)
*
* If setParent is true, set up subtransaction parent linkages.
*
* If setNextXid is true, set ShmemVariableCache->nextXid to the newest
* If setNextXid is true, set TransamVariables->nextXid to the newest
* value scanned.
*/
static char *
@@ -2205,7 +2205,7 @@ ProcessTwoPhaseBuffer(TransactionId xid,
bool fromdisk,
bool setParent, bool setNextXid)
{
FullTransactionId nextXid = ShmemVariableCache->nextXid;
FullTransactionId nextXid = TransamVariables->nextXid;
TransactionId origNextXid = XidFromFullTransactionId(nextXid);
TransactionId *subxids;
char *buf;