Marginal code cleanup for streaming replication.

There is no reason that proc.c should have to get involved in this dirty hack
for letting the postmaster know which children are walsenders.  Revert that
file to the way it was, and confine the kluge to pmsignal.c and postmaster.c.

src/backend/storage/ipc/pmsignal.c

@@ -8,7 +8,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/storage/ipc/pmsignal.c,v 1.30 2010/01/15 09:19:03 heikki Exp $
+ *	  $PostgreSQL: pgsql/src/backend/storage/ipc/pmsignal.c,v 1.31 2010/08/23 17:20:01 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -19,6 +19,7 @@
 
 #include "miscadmin.h"
 #include "postmaster/postmaster.h"
+#include "replication/walsender.h"
 #include "storage/pmsignal.h"
 #include "storage/shmem.h"
 
@@ -46,8 +47,8 @@
  * child processes at random, and postmaster.c is responsible for tracking
  * which one goes with which PID.
  *
- * The fourth state, WALSENDER, is just like ACTIVE, but carries the extra
- * information that the child is a WAL sender.
+ * Actually there is a fourth state, WALSENDER.  This is just like ACTIVE,
+ * but carries the extra information that the child is a WAL sender.
  */
 
 #define PM_CHILD_UNUSED		0	/* these values must fit in sig_atomic_t */
@@ -224,23 +225,8 @@ MarkPostmasterChildActive(void)
 	Assert(slot > 0 && slot <= PMSignalState->num_child_flags);
 	slot--;
 	Assert(PMSignalState->PMChildFlags[slot] == PM_CHILD_ASSIGNED);
-	PMSignalState->PMChildFlags[slot] = PM_CHILD_ACTIVE;
-}
-
-/*
- * MarkPostmasterChildWalSender - like MarkPostmasterChildActive(), but
- * marks the postmaster child as a WAL sender instead of a regular backend.
- * This is called in the child process.
- */
-void
-MarkPostmasterChildWalSender(void)
-{
-	int			slot = MyPMChildSlot;
-
-	Assert(slot > 0 && slot <= PMSignalState->num_child_flags);
-	slot--;
-	Assert(PMSignalState->PMChildFlags[slot] == PM_CHILD_ASSIGNED);
-	PMSignalState->PMChildFlags[slot] = PM_CHILD_WALSENDER;
+	PMSignalState->PMChildFlags[slot] =
+		(am_walsender ? PM_CHILD_WALSENDER : PM_CHILD_ACTIVE);
 }
 
 /*

src/backend/storage/lmgr/proc.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/storage/lmgr/proc.c,v 1.221 2010/07/06 19:18:57 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/storage/lmgr/proc.c,v 1.222 2010/08/23 17:20:01 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -39,7 +39,6 @@
 #include "access/xact.h"
 #include "miscadmin.h"
 #include "postmaster/autovacuum.h"
-#include "replication/walsender.h"
 #include "storage/ipc.h"
 #include "storage/lmgr.h"
 #include "storage/pmsignal.h"
@@ -297,12 +296,7 @@ InitProcess(void)
 	 * this; it probably should.)
 	 */
 	if (IsUnderPostmaster && !IsAutoVacuumLauncherProcess())
-	{
-		if (am_walsender)
-			MarkPostmasterChildWalSender();
-		else
-			MarkPostmasterChildActive();
-	}
+		MarkPostmasterChildActive();
 
 	/*
 	 * Initialize all fields of MyProc, except for the semaphore which was

src/include/storage/pmsignal.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/storage/pmsignal.h,v 1.32 2010/07/06 19:19:00 momjian Exp $
+ * $PostgreSQL: pgsql/src/include/storage/pmsignal.h,v 1.33 2010/08/23 17:20:01 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -47,7 +47,6 @@ extern int	AssignPostmasterChildSlot(void);
 extern bool ReleasePostmasterChildSlot(int slot);
 extern bool IsPostmasterChildWalSender(int slot);
 extern void MarkPostmasterChildActive(void);
-extern void MarkPostmasterChildWalSender(void);
 extern void MarkPostmasterChildInactive(void);
 extern bool PostmasterIsAlive(bool amDirectChild);