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diff --git a/storage/rocksdb/rdb_mutex_wrapper.h b/storage/rocksdb/rdb_mutex_wrapper.h
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+/*
+   Copyright (c) 2015, Facebook, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   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 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, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301 USA */
+
+#pragma once
+
+/* C++ standard header file */
+#include <chrono>
+#include <condition_variable>
+#include <functional>
+#include <mutex>
+#include <unordered_map>
+
+/* MySQL header files */
+#include "./my_sys.h"
+#include "mysql/plugin.h"
+
+/* RocksDB header files */
+#include "rocksdb/utilities/transaction_db_mutex.h"
+#include "rdb_mariadb_port.h"
+
+namespace myrocks {
+
+class Rdb_mutex : public rocksdb::TransactionDBMutex {
+  Rdb_mutex(const Rdb_mutex &p) = delete;
+  Rdb_mutex &operator=(const Rdb_mutex &p) = delete;
+
+ public:
+  Rdb_mutex();
+  virtual ~Rdb_mutex() override;
+
+  /*
+    Override parent class's virtual methods of interrest.
+  */
+
+  // Attempt to acquire lock.  Return OK on success, or other Status on failure.
+  // If returned status is OK, TransactionDB will eventually call UnLock().
+  virtual rocksdb::Status Lock() override;
+
+  // Attempt to acquire lock.  If timeout is non-negative, operation should be
+  // failed after this many microseconds.
+  // Returns OK on success,
+  //         TimedOut if timed out,
+  //         or other Status on failure.
+  // If returned status is OK, TransactionDB will eventually call UnLock().
+  virtual rocksdb::Status TryLockFor(
+      int64_t timeout_time MY_ATTRIBUTE((__unused__))) override;
+
+  // Unlock Mutex that was successfully locked by Lock() or TryLockUntil()
+  virtual void UnLock() override;
+
+ private:
+  mysql_mutex_t m_mutex;
+  friend class Rdb_cond_var;
+
+#ifndef STANDALONE_UNITTEST
+  void set_unlock_action(const PSI_stage_info *const old_stage_arg);
+  std::unordered_map<THD *, std::shared_ptr<PSI_stage_info>> m_old_stage_info;
+#endif
+};
+
+class Rdb_cond_var : public rocksdb::TransactionDBCondVar {
+  Rdb_cond_var(const Rdb_cond_var &) = delete;
+  Rdb_cond_var &operator=(const Rdb_cond_var &) = delete;
+
+ public:
+  Rdb_cond_var();
+  virtual ~Rdb_cond_var() override;
+
+  /*
+    Override parent class's virtual methods of interrest.
+  */
+
+  // Block current thread until condition variable is notified by a call to
+  // Notify() or NotifyAll().  Wait() will be called with mutex locked.
+  // Returns OK if notified.
+  // Returns non-OK if TransactionDB should stop waiting and fail the operation.
+  // May return OK spuriously even if not notified.
+  virtual rocksdb::Status Wait(
+      const std::shared_ptr<rocksdb::TransactionDBMutex> mutex) override;
+
+  // Block current thread until condition variable is notifiesd by a call to
+  // Notify() or NotifyAll(), or if the timeout is reached.
+  // If timeout is non-negative, operation should be failed after this many
+  // microseconds.
+  // If implementing a custom version of this class, the implementation may
+  // choose to ignore the timeout.
+  //
+  // Returns OK if notified.
+  // Returns TimedOut if timeout is reached.
+  // Returns other status if TransactionDB should otherwis stop waiting and
+  //  fail the operation.
+  // May return OK spuriously even if not notified.
+  virtual rocksdb::Status WaitFor(
+      const std::shared_ptr<rocksdb::TransactionDBMutex> mutex,
+      int64_t timeout_time) override;
+
+  // If any threads are waiting on *this, unblock at least one of the
+  // waiting threads.
+  virtual void Notify() override;
+
+  // Unblocks all threads waiting on *this.
+  virtual void NotifyAll() override;
+
+ private:
+  mysql_cond_t m_cond;
+};
+
+class Rdb_mutex_factory : public rocksdb::TransactionDBMutexFactory {
+ public:
+  Rdb_mutex_factory(const Rdb_mutex_factory &) = delete;
+  Rdb_mutex_factory &operator=(const Rdb_mutex_factory &) = delete;
+  Rdb_mutex_factory() = default;
+  /*
+    Override parent class's virtual methods of interrest.
+  */
+
+  virtual std::shared_ptr<rocksdb::TransactionDBMutex> AllocateMutex()
+      override {
+    return std::make_shared<Rdb_mutex>();
+  }
+
+  virtual std::shared_ptr<rocksdb::TransactionDBCondVar> AllocateCondVar()
+      override {
+    return std::make_shared<Rdb_cond_var>();
+  }
+
+  virtual ~Rdb_mutex_factory() override = default;
+};
+
+}  // namespace myrocks