From 090d0f2050647958865cb495dff74af7257d2bb4 Mon Sep 17 00:00:00 2001
From: Robert Haas
Date: Wed, 28 Aug 2013 14:08:13 -0400
Subject: Allow discovery of whether a dynamic background worker is running.

Using the infrastructure provided by this patch, it's possible either
to wait for the startup of a dynamically-registered background worker,
or to poll the status of such a worker without waiting.  In either
case, the current PID of the worker process can also be obtained.
As usual, worker_spi is updated to demonstrate the new functionality.

Patch by me.  Review by Andres Freund.
---
 src/include/miscadmin.h | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'src/include/miscadmin.h')

diff --git a/src/include/miscadmin.h b/src/include/miscadmin.h
index edced29f516..0aa540a08ef 100644
--- a/src/include/miscadmin.h
+++ b/src/include/miscadmin.h
@@ -28,6 +28,8 @@
 
 #define PG_BACKEND_VERSIONSTR "postgres (PostgreSQL) " PG_VERSION "\n"
 
+#define InvalidPid				(-1)
+
 
 /*****************************************************************************
  *	  System interrupt and critical section handling
-- 
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