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Rename delayChkpt to delayChkptFlags.

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Before commit 412ad7a556, delayChkpt
was a Boolean. Now it's an integer. Extensions using it need to be
appropriately updated, so let's rename the field to make sure that
a hard compilation failure occurs.

Replacing delayChkpt with delayChkptFlags made a few comments extend
past 80 characters, so I reflowed them and changed some wording very
slightly.

The back-branches will need a different change to restore compatibility
with existing minor releases; this is just for master.

Per suggestion from Tom Lane.

Discussion: http://postgr.es/m/a7880f4d-1d74-582a-ada7-dad168d046d1@enterprisedb.com
This commit is contained in:
Robert Haas
2022-04-08 11:44:17 -04:00
parent 891624f0ec
commit f37015a161
10 changed files with 57 additions and 56 deletions
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28
src/backend/access/transam/twophase.c
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@@ -479,7 +479,7 @@ MarkAsPreparingGuts(GlobalTransaction gxact, TransactionId xid, const char *gid,
}
proc->xid = xid;
Assert(proc->xmin == InvalidTransactionId);
proc->delayChkpt = 0;
proc->delayChkptFlags = 0;
proc->statusFlags = 0;
proc->pid = 0;
proc->databaseId = databaseid;
@@ -1173,11 +1173,11 @@ EndPrepare(GlobalTransaction gxact)
* Now writing 2PC state data to WAL. We let the WAL's CRC protection
* cover us, so no need to calculate a separate CRC.
*
* We have to set delayChkpt here, too; otherwise a checkpoint starting
* immediately after the WAL record is inserted could complete without
* fsync'ing our state file. (This is essentially the same kind of race
* condition as the COMMIT-to-clog-write case that RecordTransactionCommit
* uses delayChkpt for; see notes there.)
* We have to set DELAY_CHKPT_START here, too; otherwise a checkpoint
* starting immediately after the WAL record is inserted could complete
* without fsync'ing our state file. (This is essentially the same kind
* of race condition as the COMMIT-to-clog-write case that
* RecordTransactionCommit uses DELAY_CHKPT_START for; see notes there.)
*
* We save the PREPARE record's location in the gxact for later use by
* CheckPointTwoPhase.
@@ -1186,8 +1186,8 @@ EndPrepare(GlobalTransaction gxact)
START_CRIT_SECTION();
Assert((MyProc->delayChkpt & DELAY_CHKPT_START) == 0);
MyProc->delayChkpt |= DELAY_CHKPT_START;
Assert((MyProc->delayChkptFlags & DELAY_CHKPT_START) == 0);
MyProc->delayChkptFlags |= DELAY_CHKPT_START;
XLogBeginInsert();
for (record = records.head; record != NULL; record = record->next)
@@ -1230,7 +1230,7 @@ EndPrepare(GlobalTransaction gxact)
* checkpoint starting after this will certainly see the gxact as a
* candidate for fsyncing.
*/
MyProc->delayChkpt &= ~DELAY_CHKPT_START;
MyProc->delayChkptFlags &= ~DELAY_CHKPT_START;
/*
* Remember that we have this GlobalTransaction entry locked for us. If
@@ -1817,7 +1817,7 @@ CheckPointTwoPhase(XLogRecPtr redo_horizon)
*
* Note that it isn't possible for there to be a GXACT with a
* prepare_end_lsn set prior to the last checkpoint yet is marked invalid,
* because of the efforts with delayChkpt.
* because of the efforts with delayChkptFlags.
*/
LWLockAcquire(TwoPhaseStateLock, LW_SHARED);
for (i = 0; i < TwoPhaseState->numPrepXacts; i++)
@@ -2275,7 +2275,7 @@ ProcessTwoPhaseBuffer(TransactionId xid,
* RecordTransactionCommitPrepared
*
* This is basically the same as RecordTransactionCommit (q.v. if you change
* this function): in particular, we must set the delayChkpt flag to avoid a
* this function): in particular, we must set DELAY_CHKPT_START to avoid a
* race condition.
*
* We know the transaction made at least one XLOG entry (its PREPARE),
@@ -2308,8 +2308,8 @@ RecordTransactionCommitPrepared(TransactionId xid,
START_CRIT_SECTION();
/* See notes in RecordTransactionCommit */
Assert((MyProc->delayChkpt & DELAY_CHKPT_START) == 0);
MyProc->delayChkpt |= DELAY_CHKPT_START;
Assert((MyProc->delayChkptFlags & DELAY_CHKPT_START) == 0);
MyProc->delayChkptFlags |= DELAY_CHKPT_START;
/*
* Emit the XLOG commit record. Note that we mark 2PC commits as
@@ -2358,7 +2358,7 @@ RecordTransactionCommitPrepared(TransactionId xid,
TransactionIdCommitTree(xid, nchildren, children);
/* Checkpoint can proceed now */
MyProc->delayChkpt &= ~DELAY_CHKPT_START;
MyProc->delayChkptFlags &= ~DELAY_CHKPT_START;
END_CRIT_SECTION();