getpid() function

I have implemented this TODO item:

    * Add getpid() function to backend

There were a large number of pg_stat functions that access pids and
backends slots so I added it there:

    test=> select pg_stat_get_backend_mypid();
     pg_stat_get_backend_mypid
    ---------------------------
                          2757
    (1 row)

Applied.

--
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman@candle.pha.pa.us               |  (610) 853-3000
  +  If your life is a hard drive,     |  830 Blythe Avenue
  +  Christ can be your backup.        |  Drexel Hill, Pennsylvania 19026
Index: src/backend/utils/adt/pgstatfuncs.c
===================================================================
RCS file: /cvsroot/pgsql/src/backend/utils/adt/pgstatfuncs.c,v
retrieving revision 1.4
diff -c -r1.4 pgstatfuncs.c
*** src/backend/utils/adt/pgstatfuncs.c    25 Oct 2001 05:49:45 -0000    1.4
--- src/backend/utils/adt/pgstatfuncs.c    31 Jul 2002 00:36:27 -0000
***************
*** 19,24 ****
--- 19,25 ----
  extern Datum pg_stat_get_blocks_hit(PG_FUNCTION_ARGS);

  extern Datum pg_stat_get_backend_idset(PG_FUNCTION_ARGS);
+ extern Datum pg_stat_get_backend_mypid(PG_FUNCTION_ARGS);
  extern Datum pg_stat_get_backend_pid(PG_FUNCTION_ARGS);
  extern Datum pg_stat_get_backend_dbid(PG_FUNCTION_ARGS);
  extern Datum pg_stat_get_backend_userid(PG_FUNCTION_ARGS);
***************
*** 208,213 ****
--- 209,221 ----

      ((ReturnSetInfo *) (fcinfo->resultinfo))->isDone = ExprMultipleResult;
      PG_RETURN_INT32(result);
+ }
+
+
+ Datum
+ pg_stat_get_backend_mypid(PG_FUNCTION_ARGS)
+ {
+     PG_RETURN_INT32(MyProcPid);
  }


Index: src/include/catalog/pg_proc.h
===================================================================
RCS file: /cvsroot/pgsql/src/include/catalog/pg_proc.h,v
retrieving revision 1.246
diff -c -r1.246 pg_proc.h
*** src/include/catalog/pg_proc.h    24 Jul 2002 19:11:13 -0000    1.246
--- src/include/catalog/pg_proc.h    31 Jul 2002 00:36:36 -0000
***************
*** 2703,2708 ****
--- 2703,2710 ----
  DESCR("Statistics: Number of blocks found in cache");
  DATA(insert OID = 1936 (  pg_stat_get_backend_idset        PGNSP PGUID 12 f f t t s 0 23 ""
pg_stat_get_backend_idset- _null_ )); 
  DESCR("Statistics: Currently active backend IDs");
+ DATA(insert OID = 2026 (  pg_stat_get_backend_mypid        PGNSP PGUID 12 f f t f s 0 23 ""
pg_stat_get_backend_mypid- _null_ )); 
+ DESCR("Statistics: My backend ID");
  DATA(insert OID = 1937 (  pg_stat_get_backend_pid        PGNSP PGUID 12 f f t f s 1 23 "23"  pg_stat_get_backend_pid
-_null_ )); 
  DESCR("Statistics: PID of backend");
  DATA(insert OID = 1938 (  pg_stat_get_backend_dbid        PGNSP PGUID 12 f f t f s 1 26 "23"
pg_stat_get_backend_dbid- _null_ ));