From: Thomas Munro <tmunro@postgresql.org>
Date: Sat, 12 Jul 2025 04:20:11 +0000 (+1200)
Subject: aio: Fix configuration reload in IO workers.
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;ds=sidebyside;p=thirdparty%2Fpostgresql.git

aio: Fix configuration reload in IO workers.

method_worker.c installed SignalHandlerForConfigReload, but it failed to
actually process reload requests.  That hasn't yet produced any concrete
problem reports in terms of GUC changes it should have cared about in
v18, but it was inconsistent.

It did cause problems for a couple of patches in development that need
IO workers to react to ALTER SYSTEM + pg_reload_conf().  Fix extracted
from one of those patches.

Back-patch to 18.

Reported-by: Dmitry Dolgov <9erthalion6@gmail.com>
Discussion: https://postgr.es/m/sh5uqe4a4aqo5zkkpfy5fobe2rg2zzouctdjz7kou4t74c66ql%40yzpkxb7pgoxf
---

diff --git a/src/backend/storage/aio/method_worker.c b/src/backend/storage/aio/method_worker.c
index 1ce1bcd57a0..bf8f77e6ff6 100644
--- a/src/backend/storage/aio/method_worker.c
+++ b/src/backend/storage/aio/method_worker.c
@@ -575,6 +575,12 @@ IoWorkerMain(const void *startup_data, size_t startup_data_len)
 		}
 
 		CHECK_FOR_INTERRUPTS();
+
+		if (ConfigReloadPending)
+		{
+			ConfigReloadPending = false;
+			ProcessConfigFile(PGC_SIGHUP);
+		}
 	}
 
 	error_context_stack = errcallback.previous;