--- /dev/null
+++ Libc/Libc-262/mach/ms_thread_switch.c
@@ -0,0 +1,47 @@
+/*
+ * @OSF_COPYRIGHT@
+ */
+
+/* 
+ * Mach Operating System
+ * Copyright (c) 1991,1990,1989 Carnegie Mellon University
+ * All Rights Reserved.
+ * 
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ * 
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ * 
+ * Carnegie Mellon requests users of this software to return to
+ * 
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ * 
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+
+#include <mach/mach.h>
+#include <mach/message.h>
+#include <mach/rpc.h>
+#include <mach/mach_syscalls.h>
+#include <mach/thread_switch.h>
+
+kern_return_t
+thread_switch(
+	mach_port_t		thread,
+	int			option,
+	mach_msg_timeout_t	option_time)
+{
+	kern_return_t result;
+	
+		result = syscall_thread_switch(thread, option, option_time);
+	return (result);
+}