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Annotation of Gnu-Mach/ipc/ipc_marequest.h, revision 1.1.1.2

1.1.1.2 ! root        1: /*
1.1       root        2:  * Mach Operating System
                      3:  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
                      4:  * All Rights Reserved.
1.1.1.2 ! root        5:  *
1.1       root        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.
1.1.1.2 ! root       11:  *
1.1       root       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.
1.1.1.2 ! root       15:  *
1.1       root       16:  * Carnegie Mellon requests users of this software to return to
1.1.1.2 ! root       17:  *
1.1       root       18:  *  Software Distribution Coordinator  or  [email protected]
                     19:  *  School of Computer Science
                     20:  *  Carnegie Mellon University
                     21:  *  Pittsburgh PA 15213-3890
1.1.1.2 ! root       22:  *
1.1       root       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: 
1.1.1.2 ! root       82: #endif /* MACH_IPC_DEBUG */
1.1       root       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: 
1.1.1.2 ! root       98: #endif /* _IPC_IPC_MAREQUEST_H_ */

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