lock.h revision 1.5 
1/* $NetBSD: lock.h,v 1.5 2017/10/23 06:43:00 msaitoh Exp $ */
2
3/*-
4 * Copyright (c) 2007 Jared D. McNeill <jmcneill@invisible.ca>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#ifndef _ARCH_USERMODE_INCLUDE_LOCK_H
30#define _ARCH_USERMODE_INCLUDE_LOCK_H
31
32__inline static void
33__cpu_simple_lock_init(__cpu_simple_lock_t *lockp)
34{
35	*lockp = __SIMPLELOCK_UNLOCKED;
36}
37
38__inline static int
39__cpu_simple_lock_try(__cpu_simple_lock_t *lockp)
40{
41	if (*lockp == __SIMPLELOCK_LOCKED)
42		return 0;
43	*lockp = __SIMPLELOCK_LOCKED;
44	return 1;
45}
46
47__inline static void
48__cpu_simple_lock(__cpu_simple_lock_t *lockp)
49{
50	while (!__cpu_simple_lock_try(lockp))
51		;
52}
53
54__inline static void
55__cpu_simple_unlock(__cpu_simple_lock_t *lockp)
56{
57	*lockp = __SIMPLELOCK_UNLOCKED;
58}
59
60__inline static int
61__SIMPLELOCK_LOCKED_P(const __cpu_simple_lock_t *lockp)
62{
63	return *lockp == __SIMPLELOCK_LOCKED;
64}
65
66__inline static int
67__SIMPLELOCK_UNLOCKED_P(const __cpu_simple_lock_t *lockp)
68{
69	return *lockp == __SIMPLELOCK_UNLOCKED;
70}
71
72#endif /* !_ARCH_USERMODE_INCLUDE_LOCK_H */
73