1 /* $NetBSD: mach_semaphore.h,v 1.4 2003/12/30 00:15:46 manu 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 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the NetBSD
21 * Foundation, Inc. and its contributors.
22 * 4. Neither the name of The NetBSD Foundation nor the names of its
23 * contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
37 */
38
39 #ifndef _MACH_SEMAPHORE_H_
40 #define _MACH_SEMAPHORE_H_
41
42 #include <sys/lock.h>
43 #include <sys/queue.h>
44
45 extern int mach_semaphore_cold;
46
47 struct mach_waiting_lwp {
48 TAILQ_ENTRY(mach_waiting_lwp) mwl_list;
49 struct lwp *mwl_l;
50 };
51
52 struct mach_semaphore {
53 int ms_value;
54 int ms_policy;
55 LIST_ENTRY(mach_semaphore) ms_list;
56 TAILQ_HEAD(ms_waiting, mach_waiting_lwp) ms_waiting;
57 struct lock ms_lock;
58 };
59
60 /* semaphore_create */
61
62 #define MACH_SYNC_POLICY_FIFO 0
63 #define MACH_SYNC_POLICY_FIXED_PRIORITY 1
64
65 typedef struct {
66 mach_msg_header_t req_msgh;
67 mach_ndr_record_t req_ndr;
68 int req_policy;
69 int req_value;
70 } mach_semaphore_create_request_t;
71
72 typedef struct {
73 mach_msg_header_t rep_msgh;
74 mach_msg_body_t rep_body;
75 mach_msg_port_descriptor_t rep_sem;
76 mach_msg_trailer_t rep_trailer;
77 } mach_semaphore_create_reply_t;
78
79 /* semaphore_destroy */
80
81 typedef struct {
82 mach_msg_header_t req_msgh;
83 mach_msg_body_t req_body;
84 mach_msg_port_descriptor_t req_sem;
85 } mach_semaphore_destroy_request_t;
86
87 typedef struct {
88 mach_msg_header_t rep_msgh;
89 mach_ndr_record_t rep_ndr;
90 mach_kern_return_t rep_retval;
91 mach_msg_trailer_t rep_trailer;
92 } mach_semaphore_destroy_reply_t;
93
94 void mach_semaphore_init(void);
95 void mach_semaphore_cleanup(struct lwp *);
96
97 #endif /* _MACH_SEMAPHORE_H_ */
98
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