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diff --git a/innobase/include/os0shm.h b/innobase/include/os0shm.h
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+++ b/innobase/include/os0shm.h
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+/******************************************************
+The interface to the operating system
+shared memory primitives
+
+(c) 1995 Innobase Oy
+
+Created 9/23/1995 Heikki Tuuri
+*******************************************************/
+
+#ifndef os0shm_h
+#define os0shm_h
+
+#include "univ.i"
+
+typedef void*			os_shm_t;
+
+
+/********************************************************************
+Creates an area of shared memory. It can be named so that
+different processes may access it in the same computer.
+If an area with the same name already exists, returns
+a handle to that area (where the size of the area is
+not changed even if this call requests a different size).
+To use the area, it first has to be mapped to the process
+address space by os_shm_map. */
+
+os_shm_t
+os_shm_create(
+/*==========*/
+			/* out, own: handle to the shared
+			memory area, NULL if error */
+	ulint	size,	/* in: area size < 4 GB */
+	char*	name);	/* in: name of the area as a null-terminated
+			string */
+/***************************************************************************
+Frees a shared memory area. The area can be freed only after it
+has been unmapped in all the processes where it was mapped. */
+
+ibool
+os_shm_free(
+/*========*/
+				/* out: TRUE if success */
+	os_shm_t	shm);	/* in, own: handle to a shared memory area */
+/***************************************************************************
+Maps a shared memory area in the address space of a process. */
+
+void*
+os_shm_map(
+/*=======*/
+				/* out: address of the area, NULL if error */
+	os_shm_t	shm);	/* in: handle to a shared memory area */
+/***************************************************************************
+Unmaps a shared memory area from the address space of a process. */
+
+ibool
+os_shm_unmap(
+/*=========*/
+			/* out: TRUE if succeed */
+	void*	addr);	/* in: address of the area */
+
+
+#ifndef UNIV_NONINL
+#include "os0shm.ic"
+#endif
+
+#endif