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pgsql: Improve commentary in timeout.c.

From:	Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To:	pgsql-committers(at)lists(dot)postgresql(dot)org
Subject:	pgsql: Improve commentary in timeout.c.
Date:	2021-01-07 03:09:23
Message-ID:	E1kxLfv-0005CH-Pq@gemulon.postgresql.org
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Improve commentary in timeout.c.

On re-reading I realized that I'd missed one race condition in the new
timeout code. It's safe, but add a comment explaining it.

Branch
------
master

Modified Files
--------------
src/backend/utils/misc/timeout.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)

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