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<literal>BGWH_POSTMASTER_DIED</literal>.
</para>
+ <para>
+ If a background worker sends asynchronous notifications with the
+ <command>NOTIFY</command> command via the Server Programming Interface
+ (<acronym>SPI</acronym>), it should call
+ <function>ProcessCompletedNotifies</function> explicitly after committing
+ the enclosing transaction so that any notifications can be delivered. If a
+ background worker registers to receive asynchronous notifications with
+ the <command>LISTEN</command> through <acronym>SPI</acronym>, the worker
+ will log those notifications, but there is no programmatic way for the
+ worker to intercept and respond to those notifications.
+ </para>
+
<para>
The <filename>worker_spi</> contrib module contains a working example,
which demonstrates some useful techniques.