From: Michael Paquier <michael@paquier.xyz>
To: pgsql-committers@lists.postgresql.org
Subject: pgsql: injection_points: Fix incrementation of variable-numbered stats
Date: Wed, 17 Sep 2025 01:16:27 +0000
Message-ID: <E1uygmY-0015aI-2o@gemulon.postgresql.org> (raw)
injection_points: Fix incrementation of variable-numbered stats
The pending entry was not used when incrementing its data, directly
manipulating the shared memory pointer, without even locking it. This
could mean losing statistics under concurrent activity. The flush
callback was a no-op.
This code serves as a base template for extensions for the custom
cumulative statistics, so let's be clean and use a pending entry for the
incrementations, whose data is then flushed to the corresponding entry
in the shared hashtable when all the stats are reported, in its own
flush callback.
Author: Sami Imseih <samimseih@gmail.com>
Discussion: https://postgr.es/m/CAA5RZ0v0U0yhPbY+bqChomkPbyUrRQ3rQXnZf_SB-svDiQOpgQ@mail.gmail.com
Backpatch-through: 18
Branch
------
REL_18_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/6e8286f9a15325b6354a682a9106b4035dba0f17
Modified Files
--------------
src/test/modules/injection_points/injection_stats.c | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)
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To: pgsql-committers@postgresql.org
Cc: michael@paquier.xyz, pgsql-committers@lists.postgresql.org
Subject: Re: pgsql: injection_points: Fix incrementation of variable-numbered stats
In-Reply-To: <E1uygmY-0015aI-2o@gemulon.postgresql.org>
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