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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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