Allow discovery of whether a dynamic background worker is running.

[postgresql] / src / include / miscadmin.h

diff --git a/src/include/miscadmin.h b/src/include/miscadmin.h
index edced29f516798596328e8f5462f62f7fffe9885..0aa540a08ef8e53db4e1aa339df27a20c4de66b6 100644 (file)
--- 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