doc: Add WaitForBackgroundWorkerShutdown() to bgw docs.

Commit 924bcf4f16d added WaitForBackgroundWorkerShutdown, but didn't
add it to the documentation. Fix that and two small spelling errors in
the WaitForBackgroundWorkerStartup paragraph.

Author: Daniel Gustafsson
Discussion: https://postgr.es/m/C8738949-0350-4999-A1DA-26E209FF248D@yesql.se

diff --git a/doc/src/sgml/bgworker.sgml b/doc/src/sgml/bgworker.sgml
index e490bb8750e23469290ed6bb61b73d590f75c175..18ad2e457713ad79285b350b524a173698304adc 100644 (file)
--- a/doc/src/sgml/bgworker.sgml
+++ b/doc/src/sgml/bgworker.sgml
@@ -259,13 +259,24 @@ typedef struct BackgroundWorker
    WaitForBackgroundWorkerStartup(BackgroundWorkerHandle
    *handle, pid_t *) function.
    This function will block until the postmaster has attempted to start the
-   background worker, or until the postmaster dies.  If the background runner
-   is running, the return value will BGWH_STARTED, and
+   background worker, or until the postmaster dies.  If the background worker
+   is running, the return value will be BGWH_STARTED, and
    the PID will be written to the provided address.  Otherwise, the return
    value will be BGWH_STOPPED or
    BGWH_POSTMASTER_DIED.
   
 
+  
+   A process can also wait for a background worker to shut down, by using the
+   WaitForBackgroundWorkerShutdown(BackgroundWorkerHandle
+   *handle) function and passing the
+   BackgroundWorkerHandle * obtained at registration. This
+   function will block until the background worker exits, or postmaster dies.
+   When the background worker exits, the return value is
+   BGWH_STOPPED, if postmaster dies it will return
+   BGWH_POSTMASTER_DIED.
+  
+
   
    If a background worker sends asynchronous notifications with the
    NOTIFY command via the Server Programming Interface