diff --git a/winsup/cygwin/include/cygwin/_types.h b/winsup/cygwin/include/cygwin/_types.h
new file mode 100644
index 000000000..b96267622
--- /dev/null
+++ b/winsup/cygwin/include/cygwin/_types.h
@@ -0,0 +1,16 @@
+/* cygwin/_types.h
+
+   Copyright 2004 Red Hat, Inc.
+
+This file is part of Cygwin.
+
+This software is a copyrighted work licensed under the terms of the
+Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
+details. */
+
+#ifndef _CYGWIN__TYPES_H
+#define _CYGWIN__TYPES_H
+
+typedef void *_flock_t;
+
+#endif	/* _CYGWIN__TYPES_H */
diff --git a/winsup/cygwin/include/sys/lock.h b/winsup/cygwin/include/sys/lock.h
new file mode 100644
index 000000000..c0cc6fac7
--- /dev/null
+++ b/winsup/cygwin/include/sys/lock.h
@@ -0,0 +1,40 @@
+/* sys/lock.h
+
+   Copyright 2004 Red Hat, Inc.
+
+This file is part of Cygwin.
+
+This software is a copyrighted work licensed under the terms of the
+Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
+details. */
+
+#ifndef _SYS_LOCK_H_
+#define _SYS_LOCK_H_
+
+typedef void *_LOCK_T;
+#define _LOCK_RECURSIVE_T _LOCK_T
+
+/*
+ * This must match cygwins PTHREAD_XXX_MUTEX_INITIALIZER_NP which are
+ * defined in <pthread.h>
+ */
+#define _LOCK_T_RECURSIVE_INITIALIZER ((_LOCK_T)18)
+#define _LOCK_T_INITIALIZER ((_LOCK_T)19)
+
+#define __LOCK_INIT(CLASS,NAME) \
+  CLASS _LOCK_T NAME = _LOCK_T_INITIALIZER; 
+#define __LOCK_INIT_RECURSIVE(CLASS,NAME) \
+  CLASS _LOCK_T NAME = _LOCK_T_RECURSIVE_INITIALIZER;
+
+#define __lock_init(__lock) __cygwin_lock_init(&__lock)
+#define __lock_init_recursive(__lock) __cygwin_lock_init_recursive(&__lock)
+#define __lock_close(__lock) __cygwin_lock_fini(&__lock)
+#define __lock_close_recursive(__lock) __cygwin_lock_fini(&__lock)
+#define __lock_acquire(__lock) __cygwin_lock_lock(&__lock)
+#define __lock_acquire_recursive(__lock) __cygwin_lock_lock(&__lock)
+#define __lock_try_acquire(lock) __cygwin_lock_trylock(&__lock)
+#define __lock_try_acquire_recursive(lock) __cygwin_lock_trylock(&__lock)
+#define __lock_release(__lock) __cygwin_lock_unlock(&__lock)
+#define __lock_release_recursive(__lock) __cygwin_lock_unlock(&__lock)
+
+#endif
diff --git a/winsup/cygwin/include/sys/stdio.h b/winsup/cygwin/include/sys/stdio.h
new file mode 100644
index 000000000..04d8ffcaf
--- /dev/null
+++ b/winsup/cygwin/include/sys/stdio.h
@@ -0,0 +1,25 @@
+/* sys/stdio.h
+
+   Copyright 2004 Red Hat, Inc.
+
+This file is part of Cygwin.
+
+This software is a copyrighted work licensed under the terms of the
+Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
+details. */
+
+#ifndef _SYS_STDIO_H_
+#define _SYS_STDIO_H_
+
+#include <sys/lock.h>
+
+#if !defined(__SINGLE_THREAD__)
+#  if !defined(_flockfile)
+#    define _flockfile(fp) __cygwin_lock_lock ((_LOCK_T *)&(fp)->_lock)
+#  endif
+#  if !defined(_funlockfile)
+#    define _funlockfile(fp) __cygwin_lock_unlock ((_LOCK_T *)&(fp)->_lock)
+#  endif
+#endif
+ 
+#endif