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+/*****************************************************************************
+
+Copyright (c) 2013, 2015, Oracle and/or its affiliates. All Rights Reserved.
+Copyright (c) 2017, 2020, MariaDB Corporation.
+
+Portions of this file contain modifications contributed and copyrighted by
+Google, Inc. Those modifications are gratefully acknowledged and are described
+briefly in the InnoDB documentation. The contributions by Google are
+incorporated with their permission, and subject to the conditions contained in
+the file COPYING.Google.
+
+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/sync0debug.h
+Debug checks for latches, header file
+
+Created 2012-08-21 Sunny Bains
+*******************************************************/
+
+#ifndef sync0debug_h
+#define sync0debug_h
+
+#include "univ.i"
+
+/** Initializes the synchronization data structures. */
+void
+sync_check_init();
+
+/** Free the InnoDB synchronization data structures. */
+void
+sync_check_close();
+
+#ifdef UNIV_DEBUG
+/** Check if it is OK to acquire the latch.
+@param[in]	latch	latch type */
+void
+sync_check_lock_validate(const latch_t* latch);
+
+/** Note that the lock has been granted
+@param[in]	latch	latch type */
+void
+sync_check_lock_granted(const latch_t* latch);
+
+/** Check if it is OK to acquire the latch.
+@param[in]	latch	latch type
+@param[in]	level	the level of the mutex */
+void
+sync_check_lock(const latch_t* latch, latch_level_t level);
+
+/**
+Check if it is OK to re-acquire the lock. */
+void
+sync_check_relock(const latch_t* latch);
+
+/** Removes a latch from the thread level array if it is found there.
+@param[in]	latch	to unlock */
+void
+sync_check_unlock(const latch_t* latch);
+
+/** Checks if the level array for the current thread contains a
+mutex or rw-latch at the specified level.
+@param[in]	level	to find
+@return	a matching latch, or NULL if not found */
+const latch_t*
+sync_check_find(latch_level_t level);
+
+/** Checks that the level array for the current thread is empty.
+Terminate iteration if the functor returns true.
+@param[in]	 functor	called for each element.
+@return true if the functor returns true for any element */
+bool
+sync_check_iterate(const sync_check_functor_t& functor);
+
+/** Acquires the debug mutex. We cannot use the mutex defined in sync0sync,
+because the debug mutex is also acquired in sync0arr while holding the OS
+mutex protecting the sync array, and the ordinary mutex_enter might
+recursively call routines in sync0arr, leading to a deadlock on the OS
+mutex. */
+void
+rw_lock_debug_mutex_enter();
+
+/** Releases the debug mutex. */
+void
+rw_lock_debug_mutex_exit();
+
+#endif /* UNIV_DEBUG */
+
+#endif /* !sync0debug_h */