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diff --git a/kern/time_out.h b/kern/time_out.h
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+/* 
+ * Mach Operating System
+ * Copyright (c) 1991,1990,1989,1988,1987 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.
+ */
+
+#ifndef	_KERN_TIME_OUT_H_
+#define	_KERN_TIME_OUT_H_
+
+/*
+ * Mach time-out and time-of-day facility.
+ */
+
+#include <mach/boolean.h>
+#include <kern/lock.h>
+#include <kern/queue.h>
+#include <kern/zalloc.h>
+
+/*
+ *	Timers in kernel:
+ */
+extern unsigned long elapsed_ticks; /* number of ticks elapsed since bootup */
+extern int	hz;		/* number of ticks per second */
+extern int	tick;		/* number of usec per tick */
+
+/*
+ *	Time-out element.
+ */
+struct timer_elt {
+	queue_chain_t	chain;		/* chain in order of expiration */
+	int		(*fcn)();	/* function to call */
+	char *		param;		/* with this parameter */
+	unsigned long	ticks;		/* expiration time, in ticks */
+	int		set;		/* unset | set | allocated */
+};
+#define	TELT_UNSET	0		/* timer not set */
+#define	TELT_SET	1		/* timer set */
+#define	TELT_ALLOC	2		/* timer allocated from pool */
+
+typedef	struct timer_elt	timer_elt_data_t;
+typedef	struct timer_elt	*timer_elt_t;
+
+/* for 'private' timer elements */
+extern void		set_timeout();
+extern boolean_t	reset_timeout();
+
+/* for public timer elements */
+extern void		timeout();
+extern boolean_t	untimeout();
+
+#define	set_timeout_setup(telt,fcn,param,interval)	\
+	((telt)->fcn = (fcn),				\
+	 (telt)->param = (param),			\
+	 (telt)->private = TRUE,			\
+	 set_timeout((telt), (interval)))
+
+#define	reset_timeout_check(t) \
+	MACRO_BEGIN \
+	if ((t)->set) \
+	    reset_timeout((t)); \
+	MACRO_END
+
+#endif	_KERN_TIME_OUT_H_