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docs: Clarify flag dependencies for background workers.

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BGWORKER_BACKEND_DATABASE_CONNECTION can only be used if
BGWORKER_SHMEM_ACCESS is also used.

Michael Paquier, with some tweaks by me.
This commit is contained in:
Robert Haas 2013-07-04 11:11:56 -04:00
parent 0d1795680d
commit 5cbe935c9d
1 changed files with 4 additions and 1 deletions
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doc/src/sgml/bgworker.sgml
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@ -64,7 +64,10 @@ typedef struct BackgroundWorker
<literal>BGWORKER_SHMEM_ACCESS</literal> (requesting shared memory access) <literal>BGWORKER_SHMEM_ACCESS</literal> (requesting shared memory access)
and <literal>BGWORKER_BACKEND_DATABASE_CONNECTION</literal> (requesting the and <literal>BGWORKER_BACKEND_DATABASE_CONNECTION</literal> (requesting the
ability to establish a database connection, through which it can later run 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>
<para> <para>