0001-Remove-unused-latch.patch

From 48179fe6792de431c4c6234ce8a009e8baa86e47 Mon Sep 17 00:00:00 2001
From: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: Sat, 24 Aug 2024 01:04:21 +0300
Subject: [PATCH 01/11] Remove unused latch

It was left unused by commit bc971f4025, which replaced the latch
usage with a condition variable
---
 src/backend/replication/walsender.c         | 3 ---
 src/include/replication/walsender_private.h | 7 -------
 2 files changed, 10 deletions(-)

diff --git a/src/backend/replication/walsender.c b/src/backend/replication/walsender.c
index c5f1009f37..866b69ec85 100644
--- a/src/backend/replication/walsender.c
+++ b/src/backend/replication/walsender.c
@@ -2935,7 +2935,6 @@ InitWalSenderSlot(void)
 			walsnd->flushLag = -1;
 			walsnd->applyLag = -1;
 			walsnd->sync_standby_priority = 0;
-			walsnd->latch = &MyProc->procLatch;
 			walsnd->replyTime = 0;
 
 			/*
@@ -2979,8 +2978,6 @@ WalSndKill(int code, Datum arg)
 	MyWalSnd = NULL;
 
 	SpinLockAcquire(&walsnd->mutex);
-	/* clear latch while holding the spinlock, so it can safely be read */
-	walsnd->latch = NULL;
 	/* Mark WalSnd struct as no longer being in use. */
 	walsnd->pid = 0;
 	SpinLockRelease(&walsnd->mutex);
diff --git a/src/include/replication/walsender_private.h b/src/include/replication/walsender_private.h
index cf32ac2488..41ac736b95 100644
--- a/src/include/replication/walsender_private.h
+++ b/src/include/replication/walsender_private.h
@@ -18,7 +18,6 @@
 #include "nodes/replnodes.h"
 #include "replication/syncrep.h"
 #include "storage/condition_variable.h"
-#include "storage/latch.h"
 #include "storage/shmem.h"
 #include "storage/spin.h"
 
@@ -71,12 +70,6 @@ typedef struct WalSnd
 	/* Protects shared variables in this structure. */
 	slock_t		mutex;
 
-	/*
-	 * Pointer to the walsender's latch. Used by backends to wake up this
-	 * walsender when it has work to do. NULL if the walsender isn't active.
-	 */
-	Latch	   *latch;
-
 	/*
 	 * Timestamp of the last message received from standby.
 	 */
-- 
2.39.2