pgsql: Use LW_SHARED in dsa.c where possible.

From: Nathan Bossart <nathan(at)postgresql(dot)org>
To: pgsql-committers(at)lists(dot)postgresql(dot)org
Subject: pgsql: Use LW_SHARED in dsa.c where possible.
Date: 2025-12-02 22:40:48
Message-ID: E1vQZ39-002Uru-1g@gemulon.postgresql.org
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Use LW_SHARED in dsa.c where possible.

Both dsa_get_total_size() and dsa_get_total_size_from_handle() take
an exclusive lock just to read a variable. This commit reduces the
lock level to LW_SHARED in those functions.

Reviewed-by: Sami Imseih <samimseih(at)gmail(dot)com>
Discussion: https://postgr.es/m/aS8fMzWs9e8iHxk2%40nathan

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/a6d05c819380b0940fcfb428aa298f2d7e76e5c6

Modified Files
--------------
src/backend/utils/mmgr/dsa.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

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