osfmk/ipc/ipc_mqueue.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * @OSF_COPYRIGHT@
  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  Software.Distribution@CS.CMU.EDU
  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  */
  52 /*
  53  *      File:   ipc/ipc_mqueue.h
  54  *      Author: Rich Draves
  55  *      Date:   1989
  56  *
  57  *      Definitions for message queues.
  58  */
  59
  60 #ifndef _IPC_IPC_MQUEUE_H_
  61 #define _IPC_IPC_MQUEUE_H_
  62
  63 #include <mach_assert.h>
  64
  65 #include <mach/message.h>
  66
  67 #include <kern/assert.h>
  68 #include <kern/macro_help.h>
  69 #include <kern/wait_queue.h>
  70
  71 #include <ipc/ipc_kmsg.h>
  72 #include <ipc/ipc_object.h>
  73 #include <ipc/ipc_types.h>
  74
  75 typedef struct ipc_mqueue {
  76         union {
  77                 struct {
  78                         struct  wait_queue      wait_queue;
  79                         struct ipc_kmsg_queue   messages;
  80                         mach_port_msgcount_t    msgcount;
  81                         mach_port_msgcount_t    qlimit;
  82                         mach_port_seqno_t       seqno;
  83                         boolean_t               fullwaiters;
  84                 } port;
  85                 struct wait_queue_set           set_queue;
  86         } data;
  87 } *ipc_mqueue_t;
  88
  89 #define IMQ_NULL                ((ipc_mqueue_t) 0)
  90
  91 #define imq_wait_queue          data.port.wait_queue
  92 #define imq_messages            data.port.messages
  93 #define imq_msgcount            data.port.msgcount
  94 #define imq_qlimit              data.port.qlimit
  95 #define imq_seqno               data.port.seqno
  96 #define imq_fullwaiters         data.port.fullwaiters
  97
  98 #define imq_set_queue           data.set_queue
  99 #define imq_setlinks            data.set_queue.wqs_setlinks
 100 #define imq_is_set(mq)          wait_queue_is_set(&(mq)->imq_set_queue)
 101
 102 #define imq_lock(mq)            wait_queue_lock(&(mq)->imq_wait_queue)
 103 #define imq_lock_try(mq)        wait_queue_lock_try(&(mq)->imq_wait_queue)
 104 #define imq_unlock(mq)          wait_queue_unlock(&(mq)->imq_wait_queue)
 105 #define imq_held(mq)            wait_queue_held(&(mq)->imq_wait_queue)
 106
 107 #define imq_full(mq)            ((mq)->imq_msgcount >= (mq)->imq_qlimit)
 108
 109 extern int ipc_mqueue_full;
 110 extern int ipc_mqueue_rcv;
 111
 112 #define IPC_MQUEUE_FULL         (event64_t)&ipc_mqueue_full
 113 #define IPC_MQUEUE_RECEIVE      (event64_t)&ipc_mqueue_rcv
 114
 115 /*
 116  * Exported interfaces
 117  */
 118
 119 /* Initialize a newly-allocated message queue */
 120 extern void ipc_mqueue_init(
 121         ipc_mqueue_t    mqueue,
 122         boolean_t       is_set);
 123
 124 /* Wake up receivers waiting in a message queue */
 125 extern void ipc_mqueue_changed(
 126         ipc_mqueue_t            mqueue);
 127
 128 /* Send a message to a port */
 129 extern mach_msg_return_t ipc_mqueue_send(
 130         ipc_mqueue_t            mqueue,
 131         ipc_kmsg_t              kmsg,
 132         mach_msg_option_t       option,
 133         mach_msg_timeout_t      timeout);
 134
 135 /* Deliver message to message queue or waiting receiver */
 136 extern void ipc_mqueue_post(
 137         ipc_mqueue_t            mqueue,
 138         ipc_kmsg_t              kmsg);
 139
 140 /* Receive a message from a message queue */
 141 extern void ipc_mqueue_receive(
 142         ipc_mqueue_t            mqueue,
 143         mach_msg_option_t       option,
 144         mach_msg_size_t         max_size,
 145         mach_msg_timeout_t      timeout,
 146         int                     interruptible);
 147
 148 /* Continuation routine for message receive */
 149 extern void ipc_mqueue_receive_continue(void);
 150
 151 /* Select a message from a queue and try to post it to ourself */
 152 extern void ipc_mqueue_select(
 153         ipc_mqueue_t            mqueue,
 154         mach_msg_option_t       option,
 155         mach_msg_size_t         max_size);
 156
 157 /* Clear a message count reservation */
 158 extern void ipc_mqueue_release_msgcount(
 159         ipc_mqueue_t            mqueue);
 160
 161 /* Change a queue limit */
 162 extern void ipc_mqueue_set_qlimit(
 163         ipc_mqueue_t            mqueue,
 164         mach_port_msgcount_t    qlimit);
 165
 166 /* Change a queue's sequence number */
 167 extern void ipc_mqueue_set_seqno(
 168         ipc_mqueue_t            mqueue,
 169         mach_port_seqno_t       seqno);
 170
 171 /* Convert a name in a space to a message queue */
 172 extern mach_msg_return_t ipc_mqueue_copyin(
 173         ipc_space_t             space,
 174         mach_port_name_t        name,
 175         ipc_mqueue_t            *mqueuep,
 176         ipc_object_t            *objectp);
 177
 178 #endif  /* _IPC_IPC_MQUEUE_H_ */