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Annotation of OSKit-Mach/ipc/ipc_marequest.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Mach Operating System
        !             3:  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
        !             4:  * All Rights Reserved.
        !             5:  *
        !             6:  * Permission to use, copy, modify and distribute this software and its
        !             7:  * documentation is hereby granted, provided that both the copyright
        !             8:  * notice and this permission notice appear in all copies of the
        !             9:  * software, derivative works or modified versions, and any portions
        !            10:  * thereof, and that both notices appear in supporting documentation.
        !            11:  *
        !            12:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
        !            13:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
        !            14:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            15:  *
        !            16:  * Carnegie Mellon requests users of this software to return to
        !            17:  *
        !            18:  *  Software Distribution Coordinator  or  [email protected]
        !            19:  *  School of Computer Science
        !            20:  *  Carnegie Mellon University
        !            21:  *  Pittsburgh PA 15213-3890
        !            22:  *
        !            23:  * any improvements or extensions that they make and grant Carnegie Mellon
        !            24:  * the rights to redistribute these changes.
        !            25:  */
        !            26: /*
        !            27:  *     File:   ipc/ipc_marequest.h
        !            28:  *     Author: Rich Draves
        !            29:  *     Date:   1989
        !            30:  *
        !            31:  *     Definitions for msg-accepted requests.
        !            32:  */
        !            33: 
        !            34: #ifndef        _IPC_IPC_MAREQUEST_H_
        !            35: #define _IPC_IPC_MAREQUEST_H_
        !            36: 
        !            37: #include <mach_ipc_debug.h>
        !            38: 
        !            39: #include <mach/kern_return.h>
        !            40: #include <mach/port.h>
        !            41: 
        !            42: /*
        !            43:  *     A msg-accepted request is made when MACH_SEND_NOTIFY is used
        !            44:  *     to force a message to a send right.  The IE_BITS_MAREQUEST bit
        !            45:  *     in an entry indicates the entry is blocked because MACH_SEND_NOTIFY
        !            46:  *     has already been used to force a message.  The kmsg holds
        !            47:  *     a pointer to the marequest; it is destroyed when the kmsg
        !            48:  *     is received/destroyed.  (If the send right is destroyed,
        !            49:  *     this just changes imar_name.  If the space is destroyed,
        !            50:  *     the marequest is left unchanged.)
        !            51:  *
        !            52:  *     Locking considerations:  The imar_space field is read-only and
        !            53:  *     points to the space which locks the imar_name field.  imar_soright
        !            54:  *     is read-only.  Normally it is a non-null send-once right for
        !            55:  *     the msg-accepted notification, but in compat mode it is null
        !            56:  *     and the notification goes to the space's notify port.  Normally
        !            57:  *     imar_name is non-null, but if the send right is destroyed then
        !            58:  *     it is changed to be null.  imar_next is locked by a bucket lock;
        !            59:  *     imar_name is read-only when the request is in a bucket.  (So lookups
        !            60:  *     in the bucket can safely check imar_space and imar_name.)
        !            61:  *     imar_space and imar_soright both hold references.
        !            62:  */
        !            63: 
        !            64: typedef struct ipc_marequest {
        !            65:        struct ipc_space *imar_space;
        !            66:        mach_port_t imar_name;
        !            67:        struct ipc_port *imar_soright;
        !            68:        struct ipc_marequest *imar_next;
        !            69: } *ipc_marequest_t;
        !            70: 
        !            71: #define        IMAR_NULL               ((ipc_marequest_t) 0)
        !            72: 
        !            73: 
        !            74: extern void
        !            75: ipc_marequest_init();
        !            76: 
        !            77: #if    MACH_IPC_DEBUG
        !            78: 
        !            79: extern unsigned int
        !            80: ipc_marequest_info(/* unsigned int *, hash_info_bucket_t *, unsigned int */);
        !            81: 
        !            82: #endif /* MACH_IPC_DEBUG */
        !            83: 
        !            84: extern mach_msg_return_t
        !            85: ipc_marequest_create(/* ipc_space_t space, mach_port_t name,
        !            86:                        ipc_port_t soright, ipc_marequest_t *marequestp */);
        !            87: 
        !            88: extern void
        !            89: ipc_marequest_cancel(/* ipc_space_t space, mach_port_t name */);
        !            90: 
        !            91: extern void
        !            92: ipc_marequest_rename(/* ipc_space_t space,
        !            93:                        mach_port_t old, mach_port_t new */);
        !            94: 
        !            95: extern void
        !            96: ipc_marequest_destroy(/* ipc_marequest_t marequest */);
        !            97: 
        !            98: #endif /* _IPC_IPC_MAREQUEST_H_ */

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