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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/kern_return.h>
- #include <mach/port.h>
- #include <mach_debug/hash_info.h>
- #include <ipc/ipc_types.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)
- #define IPC_MAREQUEST_SIZE 16
- extern void
- ipc_marequest_init(void);
- #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, ipc_port_t port,
- mach_port_t notify, 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_ */
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