docs: Clarify flag dependencies for background workers.

robertmhaas · robertmhaas · commit 5cbe935c9d60 · 2013-07-04T11:15:12.000-04:00
BGWORKER_BACKEND_DATABASE_CONNECTION can only be used if
BGWORKER_SHMEM_ACCESS is also used.

Michael Paquier, with some tweaks by me.
diff --git 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>
