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diff --git a/storage/innobase/include/os0thread.h b/storage/innobase/include/os0thread.h
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+/*****************************************************************************
+
+Copyright (c) 1995, 2016, Oracle and/or its affiliates. All Rights Reserved.
+Copyright (c) 2017, 2020, MariaDB Corporation.
+
+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 02110-1335 USA
+
+*****************************************************************************/
+
+/**************************************************//**
+@file include/os0thread.h
+The interface to the operating system
+process and thread control primitives
+
+Created 9/8/1995 Heikki Tuuri
+*******************************************************/
+
+#ifndef os0thread_h
+#define os0thread_h
+
+#include "univ.i"
+
+/* Possible fixed priorities for threads */
+#define OS_THREAD_PRIORITY_NONE		100
+#define OS_THREAD_PRIORITY_BACKGROUND	1
+#define OS_THREAD_PRIORITY_NORMAL	2
+#define OS_THREAD_PRIORITY_ABOVE_NORMAL	3
+
+#ifdef _WIN32
+typedef DWORD			os_thread_t;
+typedef DWORD			os_thread_id_t;	/*!< In Windows the thread id
+						is an unsigned long int */
+extern "C"  {
+typedef LPTHREAD_START_ROUTINE	os_thread_func_t;
+}
+
+/** Macro for specifying a Windows thread start function. */
+#define DECLARE_THREAD(func)	WINAPI func
+#else
+
+typedef pthread_t		os_thread_t;
+typedef pthread_t		os_thread_id_t;	/*!< In Unix we use the thread
+						handle itself as the id of
+						the thread */
+extern "C"  { typedef void*	(*os_thread_func_t)(void*); }
+
+/** Macro for specifying a POSIX thread start function. */
+#define DECLARE_THREAD(func)	func
+#endif /* _WIN32 */
+
+/* Define a function pointer type to use in a typecast */
+typedef void* (*os_posix_f_t) (void*);
+
+#ifdef HAVE_PSI_INTERFACE
+/* Define for performance schema registration key */
+typedef unsigned int    mysql_pfs_key_t;
+#endif /* HAVE_PSI_INTERFACE */
+
+#ifndef _WIN32
+#define os_thread_eq(a,b) pthread_equal(a, b)
+#define os_thread_yield() sched_yield()
+#define os_thread_get_curr_id() pthread_self()
+#else
+bool os_thread_eq(os_thread_id_t a, os_thread_id_t b);
+void os_thread_yield();
+os_thread_id_t os_thread_get_curr_id();
+#endif
+
+/****************************************************************//**
+Creates a new thread of execution. The execution starts from
+the function given.
+NOTE: We count the number of threads in os_thread_exit(). A created
+thread should always use that to exit so thatthe thread count will be
+decremented.
+We do not return an error code because if there is one, we crash here. */
+os_thread_t os_thread_create(os_thread_func_t func, void *arg= nullptr);
+
+/** Detach and terminate the current thread. */
+ATTRIBUTE_NORETURN void os_thread_exit();
+
+/*****************************************************************//**
+The thread sleeps at least the time given in microseconds. */
+void
+os_thread_sleep(
+/*============*/
+	ulint	tm);	/*!< in: time in microseconds */
+
+#endif