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Add background worker type

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Add bgw_type field to background worker structure.  It is intended to be
set to the same value for all workers of the same type, so they can be
grouped in pg_stat_activity, for example.

The backend_type column in pg_stat_activity now shows bgw_type for a
background worker.  The ps listing also no longer calls out that a
process is a background worker but just show the bgw_type.  That way,
being a background worker is more of an implementation detail now that
is not shown to the user.  However, most log messages still refer to
'background worker "%s"'; otherwise constructing sensible and
translatable log messages would become tricky.

Reviewed-by: Michael Paquier <michael.paquier@gmail.com>
Reviewed-by: Daniel Gustafsson <daniel@yesql.se>
This commit is contained in:
Peter Eisentraut
2017-08-31 12:24:47 -04:00
parent 8b304b8b72
commit 5373bc2a08
10 changed files with 89 additions and 16 deletions
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6
contrib/pg_prewarm/autoprewarm.c
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@ -800,7 +800,8 @@ apw_start_master_worker(void)
worker.bgw_start_time = BgWorkerStart_ConsistentState;
strcpy(worker.bgw_library_name, "pg_prewarm");
strcpy(worker.bgw_function_name, "autoprewarm_main");
strcpy(worker.bgw_name, "autoprewarm");
strcpy(worker.bgw_name, "autoprewarm master");
strcpy(worker.bgw_type, "autoprewarm master");
if (process_shared_preload_libraries_in_progress)
{
@ -840,7 +841,8 @@ apw_start_database_worker(void)
worker.bgw_start_time = BgWorkerStart_ConsistentState;
strcpy(worker.bgw_library_name, "pg_prewarm");
strcpy(worker.bgw_function_name, "autoprewarm_database_main");
strcpy(worker.bgw_name, "autoprewarm");
strcpy(worker.bgw_name, "autoprewarm worker");
strcpy(worker.bgw_type, "autoprewarm worker");
/* must set notify PID to wait for shutdown */
worker.bgw_notify_pid = MyProcPid;