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diff --git a/ipc/ipc_thread.c b/ipc/ipc_thread.c
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+/*
+ * Mach Operating System
+ * Copyright (c) 1991,1990,1989 Carnegie Mellon University.
+ * Copyright (c) 1993,1994 The University of Utah and
+ * the Computer Systems Laboratory (CSL).
+ * 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, THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF
+ * THIS SOFTWARE IN ITS "AS IS" CONDITION, AND DISCLAIM 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:	ipc/ipc_thread.c
+ *	Author:	Rich Draves
+ *	Date:	1989
+ *
+ *	IPC operations on threads.
+ */
+
+#include <kern/assert.h>
+#include <ipc/ipc_thread.h>
+
+/*
+ *	Routine:	ipc_thread_enqueue
+ *	Purpose:
+ *		Enqueue a thread.
+ */
+
+void
+ipc_thread_enqueue(
+	ipc_thread_queue_t	queue,
+	ipc_thread_t		thread)
+{
+	ipc_thread_enqueue_macro(queue, thread);
+}
+
+/*
+ *	Routine:	ipc_thread_dequeue
+ *	Purpose:
+ *		Dequeue and return a thread.
+ */
+
+ipc_thread_t
+ipc_thread_dequeue(
+	ipc_thread_queue_t	queue)
+{
+	ipc_thread_t first;
+
+	first = ipc_thread_queue_first(queue);
+
+	if (first != ITH_NULL)
+		ipc_thread_rmqueue_first_macro(queue, first);
+
+	return first;
+}
+
+/*
+ *	Routine:	ipc_thread_rmqueue
+ *	Purpose:
+ *		Pull a thread out of a queue.
+ */
+
+void
+ipc_thread_rmqueue(
+	ipc_thread_queue_t	queue,
+	ipc_thread_t		thread)
+{
+	ipc_thread_t next, prev;
+
+	assert(queue->ithq_base != ITH_NULL);
+
+	next = thread->ith_next;
+	prev = thread->ith_prev;
+
+	if (next == thread) {
+		assert(prev == thread);
+		assert(queue->ithq_base == thread);
+
+		queue->ithq_base = ITH_NULL;
+	} else {
+		if (queue->ithq_base == thread)
+			queue->ithq_base = next;
+
+		next->ith_prev = prev;
+		prev->ith_next = next;
+		ipc_thread_links_init(thread);
+	}
+}