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Annotation of kernel/ipc/ipc_marequest.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /* 
        !            26:  * Mach Operating System
        !            27:  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
        !            28:  * All Rights Reserved.
        !            29:  * 
        !            30:  * Permission to use, copy, modify and distribute this software and its
        !            31:  * documentation is hereby granted, provided that both the copyright
        !            32:  * notice and this permission notice appear in all copies of the
        !            33:  * software, derivative works or modified versions, and any portions
        !            34:  * thereof, and that both notices appear in supporting documentation.
        !            35:  * 
        !            36:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
        !            37:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
        !            38:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            39:  * 
        !            40:  * Carnegie Mellon requests users of this software to return to
        !            41:  * 
        !            42:  *  Software Distribution Coordinator  or  [email protected]
        !            43:  *  School of Computer Science
        !            44:  *  Carnegie Mellon University
        !            45:  *  Pittsburgh PA 15213-3890
        !            46:  * 
        !            47:  * any improvements or extensions that they make and grant Carnegie Mellon
        !            48:  * the rights to redistribute these changes.
        !            49:  */
        !            50: /*
        !            51:  *     File:   ipc/ipc_marequest.h
        !            52:  *     Author: Rich Draves
        !            53:  *     Date:   1989
        !            54:  *
        !            55:  *     Definitions for msg-accepted requests.
        !            56:  */
        !            57: 
        !            58: #ifndef        _IPC_IPC_MAREQUEST_H_
        !            59: #define _IPC_IPC_MAREQUEST_H_
        !            60: 
        !            61: #import <mach/features.h>
        !            62: 
        !            63: #include <mach/kern_return.h>
        !            64: #include <mach/port.h>
        !            65: 
        !            66: /*
        !            67:  *     A msg-accepted request is made when MACH_SEND_NOTIFY is used
        !            68:  *     to force a message to a send right.  The IE_BITS_MAREQUEST bit
        !            69:  *     in an entry indicates the entry is blocked because MACH_SEND_NOTIFY
        !            70:  *     has already been used to force a message.  The kmsg holds
        !            71:  *     a pointer to the marequest; it is destroyed when the kmsg
        !            72:  *     is received/destroyed.  (If the send right is destroyed,
        !            73:  *     this just changes imar_name.  If the space is destroyed,
        !            74:  *     the marequest is left unchanged.)
        !            75:  *
        !            76:  *     Locking considerations:  The imar_space field is read-only and
        !            77:  *     points to the space which locks the imar_name field.  imar_soright
        !            78:  *     is read-only.  Normally it is a non-null send-once right for
        !            79:  *     the msg-accepted notification, but in compat mode it is null
        !            80:  *     and the notification goes to the space's notify port.  Normally
        !            81:  *     imar_name is non-null, but if the send right is destroyed then
        !            82:  *     it is changed to be null.  imar_next is locked by a bucket lock;
        !            83:  *     imar_name is read-only when the request is in a bucket.  (So lookups
        !            84:  *     in the bucket can safely check imar_space and imar_name.)
        !            85:  *     imar_space and imar_soright both hold references.
        !            86:  */
        !            87: 
        !            88: typedef struct ipc_marequest {
        !            89:        struct ipc_space *imar_space;
        !            90:        mach_port_t imar_name;
        !            91:        struct ipc_port *imar_soright;
        !            92:        struct ipc_marequest *imar_next;
        !            93: } *ipc_marequest_t;
        !            94: 
        !            95: #define        IMAR_NULL               ((ipc_marequest_t) 0)
        !            96: 
        !            97: 
        !            98: extern void
        !            99: ipc_marequest_init();
        !           100: 
        !           101: #if    MACH_IPC_DEBUG
        !           102: 
        !           103: extern unsigned int
        !           104: ipc_marequest_info(/* unsigned int *, hash_info_bucket_t *, unsigned int */);
        !           105: 
        !           106: #endif /* MACH_IPC_DEBUG */
        !           107: 
        !           108: extern mach_msg_return_t
        !           109: ipc_marequest_create(/* ipc_space_t space, mach_port_t name,
        !           110:                        ipc_port_t soright, ipc_marequest_t *marequestp */);
        !           111: 
        !           112: extern void
        !           113: ipc_marequest_cancel(/* ipc_space_t space, mach_port_t name */);
        !           114: 
        !           115: extern void
        !           116: ipc_marequest_rename(/* ipc_space_t space,
        !           117:                        mach_port_t old, mach_port_t new */);
        !           118: 
        !           119: extern void
        !           120: ipc_marequest_destroy(/* ipc_marequest_t marequest */);
        !           121: 
        !           122: #endif /* _IPC_IPC_MAREQUEST_H_ */

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