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Add HOLD_INTERRUPTS section into FinishPreparedTransaction.

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If an interrupt arrives in the middle of FinishPreparedTransaction
and any callback decide to call CHECK_FOR_INTERRUPTS (e.g.
RemoveTwoPhaseFile can write a warning with ereport, which checks for
interrupts) then it's possible to leave current GXact undeleted.

Backpatch to all supported branches

Stas Kelvich

Discussion: ihttps://www.postgresql.org/message-id/3AD85097-A3F3-4EBA-99BD-C38EDF8D2949@postgrespro.ru
This commit is contained in:
Teodor Sigaev 2018-05-03 20:10:11 +03:00
parent 70211459a5
commit 6bd659f19c
1 changed files with 5 additions and 0 deletions
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5
src/backend/access/transam/twophase.c
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@ -1391,6 +1391,9 @@ FinishPreparedTransaction(const char *gid, bool isCommit)
/* compute latestXid among all children */
latestXid = TransactionIdLatest(xid, hdr->nsubxacts, children);
/* Prevent cancel/die interrupt while cleaning up */
HOLD_INTERRUPTS();
/*
* The order of operations here is critical: make the XLOG entry for
* commit or abort, then mark the transaction committed or aborted in
@ -1478,6 +1481,8 @@ FinishPreparedTransaction(const char *gid, bool isCommit)
RemoveGXact(gxact);
MyLockedGxact = NULL;
RESUME_INTERRUPTS();
pfree(buf);
}