sys/compat/mach/mach_semaphore.h

   1 /*      $NetBSD: mach_semaphore.h,v 1.6 2007/12/05 08:33:30 ad Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2002-2003 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Emmanuel Dreyfus
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #ifndef _MACH_SEMAPHORE_H_
  33 #define _MACH_SEMAPHORE_H_
  34
  35 #include <sys/rwlock.h>
  36 #include <sys/queue.h>
  37
  38 extern int mach_semaphore_cold;
  39
  40 struct mach_waiting_lwp {
  41         TAILQ_ENTRY(mach_waiting_lwp) mwl_list;
  42         struct lwp *mwl_l;
  43 };
  44
  45 struct mach_semaphore {
  46         int ms_value;
  47         int ms_policy;
  48         LIST_ENTRY(mach_semaphore) ms_list;
  49         TAILQ_HEAD(ms_waiting, mach_waiting_lwp) ms_waiting;
  50         krwlock_t ms_lock;
  51 };
  52
  53 /* semaphore_create */
  54
  55 #define MACH_SYNC_POLICY_FIFO 0
  56 #define MACH_SYNC_POLICY_FIXED_PRIORITY 1
  57
  58 typedef struct {
  59         mach_msg_header_t req_msgh;
  60         mach_ndr_record_t req_ndr;
  61         int req_policy;
  62         int req_value;
  63 } mach_semaphore_create_request_t;
  64
  65 typedef struct {
  66         mach_msg_header_t rep_msgh;
  67         mach_msg_body_t rep_body;
  68         mach_msg_port_descriptor_t rep_sem;
  69         mach_msg_trailer_t rep_trailer;
  70 } mach_semaphore_create_reply_t;
  71
  72 /* semaphore_destroy */
  73
  74 typedef struct {
  75         mach_msg_header_t req_msgh;
  76         mach_msg_body_t req_body;
  77         mach_msg_port_descriptor_t req_sem;
  78 } mach_semaphore_destroy_request_t;
  79
  80 typedef struct {
  81         mach_msg_header_t rep_msgh;
  82         mach_ndr_record_t rep_ndr;
  83         mach_kern_return_t rep_retval;
  84         mach_msg_trailer_t rep_trailer;
  85 } mach_semaphore_destroy_reply_t;
  86
  87 void mach_semaphore_init(void);
  88 void mach_semaphore_cleanup(struct lwp *);
  89
  90 #endif /* _MACH_SEMAPHORE_H_ */
  91