From 5cbe935c9d6046f5600ff2e083b4bae6ee1f4aa2 Mon Sep 17 00:00:00 2001
From: Robert Haas <rhaas@postgresql.org>
Date: Thu, 4 Jul 2013 11:11:56 -0400
Subject: [PATCH] docs: Clarify flag dependencies for background workers.
BGWORKER_BACKEND_DATABASE_CONNECTION can only be used if
BGWORKER_SHMEM_ACCESS is also used.
Michael Paquier, with some tweaks by me.
---
doc/src/sgml/bgworker.sgml | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/doc/src/sgml/bgworker.sgml b/doc/src/sgml/bgworker.sgml
index 1151161a848..b0dde7564d8 100644
--- a/doc/src/sgml/bgworker.sgml
+++ b/doc/src/sgml/bgworker.sgml
@@ -64,7 +64,10 @@ typedef struct BackgroundWorker
<literal>BGWORKER_SHMEM_ACCESS</literal> (requesting shared memory access)
and <literal>BGWORKER_BACKEND_DATABASE_CONNECTION</literal> (requesting the
ability to establish a database connection, through which it can later run
- transactions and queries).
+ transactions and queries). A background worker using
+ <literal>BGWORKER_BACKEND_DATABASE_CONNECTION</literal> to connect to
+ a database must also attach shared memory using
+ <literal>BGWORKER_SHMEM_ACCESS</literal>, or worker start-up will fail.
</para>
<para>
--
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