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diff --git a/innobase/include/sync0arr.h b/innobase/include/sync0arr.h
new file mode 100644
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+++ b/innobase/include/sync0arr.h
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+/******************************************************
+The wait array used in synchronization primitives
+
+(c) 1995 Innobase Oy
+
+Created 9/5/1995 Heikki Tuuri
+*******************************************************/
+
+#ifndef sync0arr_h
+#define sync0arr_h
+
+#include "univ.i"
+#include "ut0lst.h"
+#include "ut0mem.h"
+#include "os0thread.h"
+
+typedef struct sync_cell_struct        	sync_cell_t;
+typedef struct sync_array_struct	sync_array_t;
+
+#define SYNC_ARRAY_OS_MUTEX	1
+#define SYNC_ARRAY_MUTEX	2
+
+/***********************************************************************
+Creates a synchronization wait array. It is protected by a mutex
+which is automatically reserved when the functions operating on it
+are called. */
+
+sync_array_t*
+sync_array_create(
+/*==============*/
+				/* out, own: created wait array */
+	ulint	n_cells,	/* in: number of cells in the array
+				to create */
+	ulint	protection);	/* in: either SYNC_ARRAY_OS_MUTEX or
+				SYNC_ARRAY_MUTEX: determines the type
+				of mutex protecting the data structure */
+/**********************************************************************
+Frees the resources in a wait array. */
+
+void
+sync_array_free(
+/*============*/
+	sync_array_t*	arr);	/* in, own: sync wait array */
+/**********************************************************************
+Reserves a wait array cell for waiting for an object.
+The event of the cell is reset to nonsignalled state. */
+
+void
+sync_array_reserve_cell(
+/*====================*/
+        sync_array_t*	arr,	/* in: wait array */
+        void*   	object, /* in: pointer to the object to wait for */
+        ulint		type,	/* in: lock request type */
+	#ifdef UNIV_SYNC_DEBUG
+        char*		file,	/* in: in debug version file where
+        			requested */
+        ulint		line,	/* in: in the debug version line where
+        			requested */
+	#endif
+        ulint*   	index);  /* out: index of the reserved cell */
+/**********************************************************************
+This function should be called when a thread starts to wait on
+a wait array cell. In the debug version this function checks
+if the wait for a semaphore will result in a deadlock, in which
+case prints info and asserts. */
+
+void
+sync_array_wait_event(
+/*==================*/
+        sync_array_t*	arr,	/* in: wait array */
+        ulint   	index);  /* in: index of the reserved cell */
+/**********************************************************************
+Frees the cell. NOTE! sync_array_wait_event frees the cell
+automatically! */
+
+void
+sync_array_free_cell(
+/*=================*/
+	sync_array_t*	arr,	/* in: wait array */
+        ulint    	index);  /* in: index of the cell in array */
+/**************************************************************************
+Looks for the cells in the wait array which refer
+to the wait object specified,
+and sets their corresponding events to the signaled state. In this
+way releases the threads waiting for the object to contend for the object.
+It is possible that no such cell is found, in which case does nothing. */
+
+void
+sync_array_signal_object(
+/*=====================*/
+	sync_array_t*	arr,	/* in: wait array */
+	void*		object);/* in: wait object */
+/************************************************************************
+Validates the integrity of the wait array. Checks
+that the number of reserved cells equals the count variable. */
+
+void
+sync_array_validate(
+/*================*/
+	sync_array_t*	arr);	/* in: sync wait array */
+/**************************************************************************
+Prints info of the wait array. */
+
+void
+sync_array_print_info(
+/*==================*/
+	sync_array_t*	arr);	/* in: wait array */
+
+
+#ifndef UNIV_NONINL
+#include "sync0arr.ic"
+#endif
+
+#endif