Tom Lane wrote:
Heikki Linnakangas <[EMAIL PROTECTED]> writes:
Tom Lane wrote:
What sort of "wait for finish" mechanism do you have in mind?

I was thinking of XactLockTableWait.

Ugh.  I don't think the bgwriter can participate in heavyweight-lockmgr
operations, or should become able to.

Oh, good point.

I suppose we could just poll and sleep, checkpoint is a heavy operation anyway so a little delay wouldn't hurt.

Nor will that work for prepared xacts --- you don't want to wait for the
eventual commit, only for PREPARE TRANSACTION to exit its critical

PREPARE TRANSACTION wouldn't set the flag in MyProc; there's no clog changes to protect from at that point. It would be set in RecordTransactionCommitPrepared when we're really committing. Just like we use the CheckpointStartLock today.

  Heikki Linnakangas

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