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diff --git a/kern/eventcount.h b/kern/eventcount.h
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+/* 
+ * Mach Operating System
+ * Copyright (c) 1993-1987 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.
+ */
+/*
+ *	File:	eventcount.c
+ *	Author:	Alessandro Forin
+ *	Date:	10/91
+ *
+ *	Eventcounters, for user-level drivers synchronization
+ *
+ */
+
+#ifndef	_KERN_EVENTCOUNT_H_
+#define	_KERN_EVENTCOUNT_H_	1
+
+/* kernel visible only */
+
+typedef struct evc {
+	int		count;
+	thread_t	waiting_thread;
+	natural_t	ev_id;
+	struct evc	*sanity;
+	decl_simple_lock_data(,	lock)
+} *evc_t;
+
+extern	void	evc_init(evc_t ev),
+		evc_destroy(evc_t ev),
+		evc_signal(evc_t ev),
+  		evc_notify_abort(thread_t thread);
+
+/* kernel and user visible */
+
+extern	kern_return_t	evc_wait(natural_t ev_id);
+
+#endif	/* _KERN_EVENTCOUNT_H_ */