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diff --git a/sysdeps/mach/bits/libc-lock.h b/sysdeps/mach/bits/libc-lock.h
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+/* libc-internal interface for mutex locks. Mach cthreads version.
+ Copyright (C) 1996, 1997 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
+
+ The GNU C Library 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#ifndef _BITS_LIBC_LOCK_H
+#define _BITS_LIBC_LOCK_H 1
+
+#ifdef _LIBC
+#include <cthreads.h>
+#define __libc_lock_t struct mutex
+#else
+typedef struct __libc_lock_opaque__ __libc_lock_t;
+#endif
+
+/* Define a lock variable NAME with storage class CLASS. The lock must be
+ initialized with __libc_lock_init before it can be used (or define it
+ with __libc_lock_define_initialized, below). Use `extern' for CLASS to
+ declare a lock defined in another module. In public structure
+ definitions you must use a pointer to the lock structure (i.e., NAME
+ begins with a `*'), because its storage size will not be known outside
+ of libc. */
+#define __libc_lock_define(CLASS,NAME) \
+ CLASS __libc_lock_t NAME;
+
+/* Define an initialized lock variable NAME with storage class CLASS. */
+#define __libc_lock_define_initialized(CLASS,NAME) \
+ CLASS __libc_lock_t NAME = MUTEX_INITIALIZER;
+
+/* Initialize the named lock variable, leaving it in a consistent, unlocked
+ state. */
+#define __libc_lock_init(NAME) __mutex_init (&(NAME))
+
+/* Finalize the named lock variable, which must be locked. It cannot be
+ used again until __libc_lock_init is called again on it. This must be
+ called on a lock variable before the containing storage is reused. */
+#define __libc_lock_fini(NAME) __mutex_unlock (&(NAME))
+
+/* Lock the named lock variable. */
+#define __libc_lock_lock(NAME) __mutex_lock (&(NAME))
+
+/* Lock the named lock variable. */
+#define __libc_lock_trylock(NAME) (!__mutex_trylock (&(NAME)))
+
+/* Unlock the named lock variable. */
+#define __libc_lock_unlock(NAME) __mutex_unlock (&(NAME))
+
+/* Start a critical region with a cleanup function */
+#define __libc_cleanup_region_start(FCT, ARG) \
+{ \
+ typeof (FCT) __save_FCT = FCT; \
+ typeof (ARG) __save_ARG = ARG; \
+ /* close brace is in __libc_cleanup_region_end below. */
+
+/* End a critical region started with __libc_cleanup_region_start. */
+#define __libc_cleanup_region_end(DOIT) \
+ if (DOIT) \
+ (*__save_FCT)(__save_ARG); \
+}
+
+
+#ifdef _LIBC
+/* We need portable names for some functions. E.g., when they are
+ used as argument to __libc_cleanup_region_start. */
+#define __libc_mutex_unlock __mutex_unlock
+#endif
+
+/* XXX until cthreads supports recursive locks */
+#define __libc_lock_define_initialized_recursive __libc_lock_define_initialized
+#define __libc_lock_init_recursive __libc_lock_init
+#define __libc_lock_fini_recursive __libc_lock_fini
+#define __libc_lock_trylock_recursive __libc_lock_trylock
+#define __libc_lock_unlock_recursive __libc_lock_unlock
+#define __libc_lock_lock_recursive __libc_lock_lock
+
+#endif /* bits/libc-lock.h */