rdelaage
/
postgresql
mirror of https://git.postgresql.org/git/postgresql.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

doc: Add WaitForBackgroundWorkerShutdown() to bgw docs. 

Commit 924bcf4f16 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
This commit is contained in:
Andres Freund 2018-03-01 01:46:04 -08:00
parent 8c438fcc9f
commit a88609089a
1 changed files with 13 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
doc/src/sgml/bgworker.sgml
View File

@ -259,13 +259,24 @@ typedef struct BackgroundWorker
<function>WaitForBackgroundWorkerStartup(<parameter>BackgroundWorkerHandle
*handle</parameter>, <parameter>pid_t *</parameter>)</function> 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 <literal>BGWH_STARTED</literal>, and
background worker, or until the postmaster dies. If the background worker
is running, the return value will be <literal>BGWH_STARTED</literal>, and
the PID will be written to the provided address. Otherwise, the return
value will be <literal>BGWH_STOPPED</literal> or
<literal>BGWH_POSTMASTER_DIED</literal>.
</para>
<para>
A process can also wait for a background worker to shut down, by using the
<function>WaitForBackgroundWorkerShutdown(<parameter>BackgroundWorkerHandle
*handle</parameter>)</function> function and passing the
<type>BackgroundWorkerHandle *</type> obtained at registration. This
function will block until the background worker exits, or postmaster dies.
When the background worker exits, the return value is
<literal>BGWH_STOPPED</literal>, if postmaster dies it will return
<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