4 files changed, 16 insertions, 0 deletions
diff --git a/src/include/replication/slot.h b/src/include/replication/slot.h
index acbf567150e..425effad210 100644
--- a/src/include/replication/slot.h
+++ b/src/include/replication/slot.h
@@ -226,6 +226,7 @@ extern PGDLLIMPORT ReplicationSlot *MyReplicationSlot;
 
 /* GUCs */
 extern PGDLLIMPORT int max_replication_slots;
+extern PGDLLIMPORT char *standby_slot_names;
 
 /* shmem initialization functions */
 extern Size ReplicationSlotsShmemSize(void);
@@ -274,4 +275,8 @@ extern void CheckSlotPermissions(void);
 extern ReplicationSlotInvalidationCause
 			GetSlotInvalidationCause(const char *conflict_reason);
 
+extern bool SlotExistsInStandbySlotNames(const char *slot_name);
+extern bool StandbySlotsHaveCaughtup(XLogRecPtr wait_for_lsn, int elevel);
+extern void WaitForStandbyConfirmation(XLogRecPtr wait_for_lsn);
+
 #endif							/* SLOT_H */
diff --git a/src/include/replication/walsender.h b/src/include/replication/walsender.h
index 0c3996e9263..f2d8297f016 100644
--- a/src/include/replication/walsender.h
+++ b/src/include/replication/walsender.h
@@ -39,6 +39,7 @@ extern void InitWalSender(void);
 extern bool exec_replication_command(const char *cmd_string);
 extern void WalSndErrorCleanup(void);
 extern void WalSndResourceCleanup(bool isCommit);
+extern void PhysicalWakeupLogicalWalSnd(void);
 extern XLogRecPtr GetStandbyFlushRecPtr(TimeLineID *tli);
 extern void WalSndSignals(void);
 extern Size WalSndShmemSize(void);
diff --git a/src/include/replication/walsender_private.h b/src/include/replication/walsender_private.h
index 3113e9ea470..109924ffcdc 100644
--- a/src/include/replication/walsender_private.h
+++ b/src/include/replication/walsender_private.h
@@ -113,6 +113,13 @@ typedef struct
 	ConditionVariable wal_flush_cv;
 	ConditionVariable wal_replay_cv;
 
+	/*
+	 * Used by physical walsenders holding slots specified in
+	 * standby_slot_names to wake up logical walsenders holding logical
+	 * failover slots when a walreceiver confirms the receipt of LSN.
+	 */
+	ConditionVariable wal_confirm_rcv_cv;
+
 	WalSnd		walsnds[FLEXIBLE_ARRAY_MEMBER];
 } WalSndCtlData;
 
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index c8a7aa9a112..d64dc5fcdb0 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -174,5 +174,8 @@ extern bool check_wal_consistency_checking(char **newval, void **extra,
 extern void assign_wal_consistency_checking(const char *newval, void *extra);
 extern bool check_wal_segment_size(int *newval, void **extra, GucSource source);
 extern void assign_wal_sync_method(int new_wal_sync_method, void *extra);
+extern bool check_standby_slot_names(char **newval, void **extra,
+									 GucSource source);
+extern void assign_standby_slot_names(const char *newval, void *extra);
 
 #endif							/* GUC_HOOKS_H */