thr_umtx.h revision 161680 
1/*-
2 * Copyright (c) 2005 David Xu <davidxu@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: head/lib/libthr/thread/thr_umtx.h 161680 2006-08-28 04:47:27Z davidxu $
27 */
28
29#ifndef _THR_FBSD_UMTX_H_
30#define _THR_FBSD_UMTX_H_
31
32#include <sys/umtx.h>
33
34typedef long umtx_t;
35
36/* simple lock routines.*/
37int __thr_umtx_lock(volatile umtx_t *mtx, long id) __hidden;
38int __thr_umtx_timedlock(volatile umtx_t *mtx, long id,
39	const struct timespec *timeout) __hidden;
40int __thr_umtx_unlock(volatile umtx_t *mtx, long id) __hidden;
41
42/* POSIX semantic lock routines */
43int __thr_umutex_lock(struct umutex *mtx, uint32_t id) __hidden;
44int __thr_umutex_timedlock(struct umutex *mtx, uint32_t id,
45	const struct timespec *timeout) __hidden;
46int __thr_umutex_unlock(struct umutex *mtx, uint32_t id) __hidden;
47int __thr_umutex_kern_trylock(struct umutex *mtx) __hidden;
48int __thr_umutex_set_ceiling(struct umutex *mtx, uint32_t ceiling,
49	uint32_t *oldceiling) __hidden;
50
51static inline void
52_thr_umtx_init(volatile umtx_t *mtx)
53{
54    *mtx = 0;
55}
56
57static inline int
58_thr_umtx_trylock(volatile umtx_t *mtx, long id)
59{
60    if (atomic_cmpset_acq_ptr((volatile uintptr_t *)mtx,
61	(uintptr_t)UMTX_UNOWNED, (uintptr_t)id))
62	return (0);
63    return (EBUSY);
64}
65
66static inline int
67_thr_umtx_lock(volatile umtx_t *mtx, long id)
68{
69    if (atomic_cmpset_acq_ptr((volatile uintptr_t *)mtx,
70	(uintptr_t)UMTX_UNOWNED, (uintptr_t)id))
71	return (0);
72    return (__thr_umtx_lock(mtx, id));
73}
74
75static inline int
76_thr_umtx_timedlock(volatile umtx_t *mtx, long id,
77	const struct timespec *timeout)
78{
79    if (atomic_cmpset_acq_ptr((volatile uintptr_t *)mtx,
80	(uintptr_t)UMTX_UNOWNED, (uintptr_t)id))
81	return (0);
82    return (__thr_umtx_timedlock(mtx, id, timeout));
83}
84
85static inline int
86_thr_umtx_unlock(volatile umtx_t *mtx, long id)
87{
88    if (atomic_cmpset_rel_ptr((volatile uintptr_t *)mtx,
89	(uintptr_t)id, (uintptr_t)UMTX_UNOWNED))
90	return (0);
91    return __thr_umtx_unlock(mtx, id);
92}
93
94int _thr_umtx_wait(volatile umtx_t *mtx, umtx_t exp,
95	const struct timespec *timeout) __hidden;
96int _thr_umtx_wake(volatile umtx_t *mtx, int count) __hidden;
97
98static inline int
99_thr_umutex_trylock(struct umutex *mtx, uint32_t id)
100{
101    if (atomic_cmpset_acq_32(&mtx->m_owner, UMUTEX_UNOWNED, id))
102	return (0);
103    if ((mtx->m_flags & UMUTEX_PRIO_PROTECT) == 0)
104    	return (EBUSY);
105    return (__thr_umutex_kern_trylock(mtx));
106}
107
108static inline int
109_thr_umutex_lock(struct umutex *mtx, uint32_t id)
110{
111    if (atomic_cmpset_acq_32(&mtx->m_owner, UMUTEX_UNOWNED, id))
112	return (0);
113    return (__thr_umutex_lock(mtx, id));
114}
115
116static inline int
117_thr_umutex_timedlock(struct umutex *mtx, uint32_t id,
118	const struct timespec *timeout)
119{
120    if (atomic_cmpset_acq_32(&mtx->m_owner, UMUTEX_UNOWNED, id))
121	return (0);
122    return (__thr_umutex_timedlock(mtx, id, timeout));
123}
124
125static inline int
126_thr_umutex_unlock(struct umutex *mtx, uint32_t id)
127{
128    if (atomic_cmpset_rel_32(&mtx->m_owner, id, UMUTEX_UNOWNED))
129	return (0);
130    return (__thr_umutex_unlock(mtx, id));
131}
132
133#endif
134