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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_marequest.h
+ *	Author:	Rich Draves
+ *	Date:	1989
+ *
+ *	Definitions for msg-accepted requests.
+ */
+
+#ifndef	_IPC_IPC_MAREQUEST_H_
+#define _IPC_IPC_MAREQUEST_H_
+
+#include <mach_ipc_debug.h>
+
+#include <mach/kern_return.h>
+#include <mach/port.h>
+
+/*
+ *	A msg-accepted request is made when MACH_SEND_NOTIFY is used
+ *	to force a message to a send right.  The IE_BITS_MAREQUEST bit
+ *	in an entry indicates the entry is blocked because MACH_SEND_NOTIFY
+ *	has already been used to force a message.  The kmsg holds
+ *	a pointer to the marequest; it is destroyed when the kmsg
+ *	is received/destroyed.  (If the send right is destroyed,
+ *	this just changes imar_name.  If the space is destroyed,
+ *	the marequest is left unchanged.)
+ *
+ *	Locking considerations:  The imar_space field is read-only and
+ *	points to the space which locks the imar_name field.  imar_soright
+ *	is read-only.  Normally it is a non-null send-once right for
+ *	the msg-accepted notification, but in compat mode it is null
+ *	and the notification goes to the space's notify port.  Normally
+ *	imar_name is non-null, but if the send right is destroyed then
+ *	it is changed to be null.  imar_next is locked by a bucket lock;
+ *	imar_name is read-only when the request is in a bucket.  (So lookups
+ *	in the bucket can safely check imar_space and imar_name.)
+ *	imar_space and imar_soright both hold references.
+ */
+
+typedef struct ipc_marequest {
+	struct ipc_space *imar_space;
+	mach_port_t imar_name;
+	struct ipc_port *imar_soright;
+	struct ipc_marequest *imar_next;
+} *ipc_marequest_t;
+
+#define	IMAR_NULL		((ipc_marequest_t) 0)
+
+
+extern void
+ipc_marequest_init();
+
+#if	MACH_IPC_DEBUG
+
+extern unsigned int
+ipc_marequest_info(/* unsigned int *, hash_info_bucket_t *, unsigned int */);
+
+#endif	MACH_IPC_DEBUG
+
+extern mach_msg_return_t
+ipc_marequest_create(/* ipc_space_t space, mach_port_t name,
+			ipc_port_t soright, ipc_marequest_t *marequestp */);
+
+extern void
+ipc_marequest_cancel(/* ipc_space_t space, mach_port_t name */);
+
+extern void
+ipc_marequest_rename(/* ipc_space_t space,
+			mach_port_t old, mach_port_t new */);
+
+extern void
+ipc_marequest_destroy(/* ipc_marequest_t marequest */);
+
+#endif	_IPC_IPC_MAREQUEST_H_