Revert: Implement pg_wal_replay_wait() stored procedure

This commit reverts 06c418e163, e37662f221, bf1e650806, 25f42429e2,
ee79928441, and 74eaf66f98 per review by Heikki Linnakangas.

Discussion: https://postgr.es/m/b155606b-e744-4218-bda5-29379779da1a%40iki.fi

1 files changed, 0 insertions, 77 deletions

diff --git a/src/include/commands/waitlsn.h b/src/include/commands/waitlsn.h
deleted file mode 100644
index da17b8be6f9..00000000000
--- a/src/include/commands/waitlsn.h
+++ /dev/null
@@ -1,77 +0,0 @@
-/*-------------------------------------------------------------------------
- *
- * waitlsn.h
- *	  Declarations for LSN replay waiting routines.
- *
- * Copyright (c) 2024, PostgreSQL Global Development Group
- *
- * src/include/commands/waitlsn.h
- *
- *-------------------------------------------------------------------------
- */
-#ifndef WAIT_LSN_H
-#define WAIT_LSN_H
-
-#include "lib/pairingheap.h"
-#include "postgres.h"
-#include "port/atomics.h"
-#include "storage/spin.h"
-#include "tcop/dest.h"
-
-/*
- * WaitLSNProcInfo – the shared memory structure representing information
- * about the single process, which may wait for LSN replay.  An item of
- * waitLSN->procInfos array.
- */
-typedef struct WaitLSNProcInfo
-{
-	/*
-	 * A process number, same as the index of this item in waitLSN->procInfos.
-	 * Stored for convenience.
-	 */
-	int			procnum;
-
-	/* LSN, which this process is waiting for */
-	XLogRecPtr	waitLSN;
-
-	/* A pairing heap node for participation in waitLSN->waitersHeap */
-	pairingheap_node phNode;
-
-	/* A flag indicating that this item is added to waitLSN->waitersHeap */
-	bool		inHeap;
-} WaitLSNProcInfo;
-
-/*
- * WaitLSNState - the shared memory state for the replay LSN waiting facility.
- */
-typedef struct WaitLSNState
-{
-	/*
-	 * The minimum LSN value some process is waiting for.  Used for the
-	 * fast-path checking if we need to wake up any waiters after replaying a
-	 * WAL record.  Could be read lock-less.  Update protected by WaitLSNLock.
-	 */
-	pg_atomic_uint64 minWaitedLSN;
-
-	/*
-	 * A pairing heap of waiting processes order by LSN values (least LSN is
-	 * on top).  Protected by WaitLSNLock.
-	 */
-	pairingheap waitersHeap;
-
-	/*
-	 * An array with per-process information, indexed by the process number.
-	 * Protected by WaitLSNLock.
-	 */
-	WaitLSNProcInfo procInfos[FLEXIBLE_ARRAY_MEMBER];
-} WaitLSNState;
-
-extern PGDLLIMPORT struct WaitLSNState *waitLSN;
-
-extern void WaitForLSN(XLogRecPtr targetLSN, int64 timeout);
-extern Size WaitLSNShmemSize(void);
-extern void WaitLSNShmemInit(void);
-extern void WaitLSNSetLatches(XLogRecPtr currentLSN);
-extern void WaitLSNCleanup(void);
-
-#endif							/* WAIT_LSN_H */