On 2017-05-04 19:45:33 -0700, Andres Freund wrote:
> Increment phs_cblock without checking rs_nblocks, but outside of the
> lock do a % scan->rs_nblocks, to get the "actual" position.  Finish if
> (phs_cblock - phs_startblock) / scan->rs_nblocks >= 1.

Err, as I've been pointed to: It should be s/lock/atomic operation/

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