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diff --git a/storage/perfschema/table_md_locks.h b/storage/perfschema/table_md_locks.h
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+/* Copyright (c) 2012, 2023, Oracle and/or its affiliates.
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License, version 2.0,
+  as published by the Free Software Foundation.
+
+  This program is also distributed with certain software (including
+  but not limited to OpenSSL) that is licensed under separate terms,
+  as designated in a particular file or component or in included license
+  documentation.  The authors of MySQL hereby grant you an additional
+  permission to link the program and your derivative works with the
+  separately licensed software that they have included with MySQL.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License, version 2.0, for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software Foundation,
+  51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */
+
+#ifndef TABLE_METADATA_LOCK_H
+#define TABLE_METADATA_LOCK_H
+
+/**
+  @file storage/perfschema/table_md_locks.h
+  Table METADATA_LOCKS (declarations).
+*/
+
+#include "pfs_column_types.h"
+#include "pfs_engine_table.h"
+#include "table_helper.h"
+
+struct PFS_metadata_lock;
+
+/**
+  @addtogroup Performance_schema_tables
+  @{
+*/
+
+/** A row of table PERFORMANCE_SCHEMA.MUTEX_INSTANCES. */
+struct row_metadata_lock
+{
+  /** Column OBJECT_INSTANCE_BEGIN. */
+  const void *m_identity;
+  opaque_mdl_type m_mdl_type;
+  opaque_mdl_duration m_mdl_duration;
+  opaque_mdl_status m_mdl_status;
+  /** Column SOURCE. */
+  char m_source[COL_SOURCE_SIZE];
+  /** Length in bytes of @c m_source. */
+  uint m_source_length;
+  /** Column OWNER_THREAD_ID. */
+  ulong m_owner_thread_id;
+  /** Column OWNER_EVENT_ID. */
+  ulong m_owner_event_id;
+  /** Columns OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME. */
+  PFS_object_row m_object;
+};
+
+/** Table PERFORMANCE_SCHEMA.METADATA_LOCKS. */
+class table_metadata_locks : public PFS_engine_table
+{
+public:
+  static PFS_engine_table_share_state m_share_state;
+  /** Table share. */
+  static PFS_engine_table_share m_share;
+  static PFS_engine_table* create();
+  static ha_rows get_row_count();
+
+  virtual int rnd_next();
+  virtual int rnd_pos(const void *pos);
+  virtual void reset_position(void);
+
+private:
+  virtual int read_row_values(TABLE *table,
+                              unsigned char *buf,
+                              Field **fields,
+                              bool read_all);
+
+  table_metadata_locks();
+
+public:
+  ~table_metadata_locks()
+  {}
+
+private:
+  void make_row(PFS_metadata_lock *pfs);
+
+  /** Table share lock. */
+  static THR_LOCK m_table_lock;
+  /** Fields definition. */
+  static TABLE_FIELD_DEF m_field_def;
+
+  /** Current row. */
+  row_metadata_lock m_row;
+  /** True if the current row exists. */
+  bool m_row_exists;
+  /** Current position. */
+  PFS_simple_index m_pos;
+  /** Next position. */
+  PFS_simple_index m_next_pos;
+};
+
+/** @} */
+#endif