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diff --git a/ipc/ipc_mqueue.h b/ipc/ipc_mqueue.h
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+/*
+ * 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.
+ */
+/*
+ *	File:	ipc/ipc_mqueue.h
+ *	Author:	Rich Draves
+ *	Date:	1989
+ *
+ *	Definitions for message queues.
+ */
+
+#ifndef	_IPC_IPC_MQUEUE_H_
+#define _IPC_IPC_MQUEUE_H_
+
+#include <mach/message.h>
+#include <kern/assert.h>
+#include <kern/lock.h>
+#include <kern/macros.h>
+#include <ipc/ipc_kmsg_queue.h>
+#include <ipc/ipc_kmsg.h>
+#include <ipc/ipc_thread.h>
+
+typedef struct ipc_mqueue {
+	decl_simple_lock_data(, imq_lock_data)
+	struct ipc_kmsg_queue imq_messages;
+	struct ipc_thread_queue imq_threads;
+} *ipc_mqueue_t;
+
+#define	IMQ_NULL		((ipc_mqueue_t) 0)
+
+#define	imq_lock_init(mq)	simple_lock_init(&(mq)->imq_lock_data)
+#define	imq_lock(mq)		simple_lock(&(mq)->imq_lock_data)
+#define	imq_lock_try(mq)	simple_lock_try(&(mq)->imq_lock_data)
+#define	imq_unlock(mq)		simple_unlock(&(mq)->imq_lock_data)
+
+extern void
+ipc_mqueue_init(ipc_mqueue_t);
+
+extern void
+ipc_mqueue_move(ipc_mqueue_t, ipc_mqueue_t, ipc_port_t);
+
+extern void
+ipc_mqueue_changed(ipc_mqueue_t, mach_msg_return_t);
+
+extern mach_msg_return_t
+ipc_mqueue_send(ipc_kmsg_t, mach_msg_option_t, mach_msg_timeout_t);
+
+extern mach_msg_return_t
+ipc_mqueue_copyin(ipc_space_t, mach_port_name_t, ipc_mqueue_t *, ipc_object_t *);
+
+#define	IMQ_NULL_CONTINUE	((void (*)()) 0)
+
+extern mach_msg_return_t
+ipc_mqueue_receive(ipc_mqueue_t, mach_msg_option_t,
+		   mach_msg_size_t, mach_msg_timeout_t,
+		   boolean_t, continuation_t,
+		   ipc_kmsg_t *, mach_port_seqno_t *);
+
+/*
+ *	extern void
+ *	ipc_mqueue_send_always(ipc_kmsg_t);
+ *
+ *	Unfortunately, to avoid warnings/lint about unused variables
+ *	when assertions are turned off, we need two versions of this.
+ */
+
+#include <kern/assert.h>
+
+#if	MACH_ASSERT
+
+#define	ipc_mqueue_send_always(kmsg)					\
+MACRO_BEGIN								\
+	mach_msg_return_t mr;						\
+									\
+	mr = ipc_mqueue_send((kmsg), MACH_SEND_ALWAYS,			\
+			     MACH_MSG_TIMEOUT_NONE);			\
+	assert(mr == MACH_MSG_SUCCESS);					\
+MACRO_END
+
+#else	/* MACH_ASSERT */
+
+#define	ipc_mqueue_send_always(kmsg)					\
+MACRO_BEGIN								\
+	(void) ipc_mqueue_send((kmsg), MACH_SEND_ALWAYS,		\
+			       MACH_MSG_TIMEOUT_NONE);			\
+MACRO_END
+
+#endif	/* MACH_ASSERT */
+
+#endif	/* _IPC_IPC_MQUEUE_H_ */