FreeBSD/Linux Kernel Cross Reference
sys/ipc/ipc_marequest.h

     /* 
      * Mach Operating System
      * Copyright (c) 1993,1992,1991,1990,1989 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.
     */
    /*
     * HISTORY
     * $Log:        ipc_marequest.h,v $
     * Revision 2.7  93/11/17  16:58:01  dbg
     *      Added ANSI function prototypes.
     *      [93/09/23            dbg]
     * 
     * Revision 2.6  92/01/14  16:44:40  rpd
     *      Changed ipc_marequest_info for CountInOut.
     *      [92/01/14            rpd]
     * 
     * Revision 2.5  91/05/14  16:33:47  mrt
     *      Correcting copyright
     * 
     * Revision 2.4  91/02/05  17:22:20  mrt
     *      Changed to new Mach copyright
     *      [91/02/01  15:46:14  mrt]
     * 
     * Revision 2.3  91/01/08  15:14:30  rpd
     *      Changed ipc_info_bucket_t to hash_info_bucket_t.
     *      [91/01/02            rpd]
     * 
     * Revision 2.2  90/06/02  14:50:35  rpd
     *      Created for new IPC.
     *      [90/03/26  20:56:53  rpd]
     * 
     */
    /*
     *      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>
    #include <ipc/ipc_types.h>
    
    #if     MACH_IPC_DEBUG
    #include <mach_debug/hash_info.h>
    #endif
    
    /*
     *      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(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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