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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_