Re: checkpoint reliability

Tom Lane wrote:
> 
> Bruce Momjian <pgman@candle.pha.pa.us> writes:
> > I was wondering, when we start to reuse a WAL file, do we know that all
> > dirty buffers modified in that WAL file have been flushed to disk?
> 
> Yes.  At least two checkpoints ago, in fact.

Isn't the following what Bruce asked ?

/**    mdsync() -- Sync storage.**/
int
mdsync()
{sync();if (IsUnderPostmaster)    sleep(2);sync();return SM_SUCCESS;
}

regards,
Hiroshi Inoue