thr_umtx.h revision 163334 
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 163334 2006-10-13 22:31:00Z davidxu $
27 */
28
29#ifndef _THR_FBSD_UMTX_H_
30#define _THR_FBSD_UMTX_H_
31
32#include <strings.h>
33#include <sys/umtx.h>
34
35#define DEFAULT_UMUTEX	{0, 0, {0, 0}, {0, 0, 0, 0}}
36
37typedef long umtx_t;
38
39int __thr_umutex_lock(struct umutex *mtx) __hidden;
40int __thr_umutex_timedlock(struct umutex *mtx,
41	const struct timespec *timeout) __hidden;
42int __thr_umutex_unlock(struct umutex *mtx) __hidden;
43int __thr_umutex_trylock(struct umutex *mtx) __hidden;
44int __thr_umutex_set_ceiling(struct umutex *mtx, uint32_t ceiling,
45	uint32_t *oldceiling) __hidden;
46
47void _thr_umutex_init(struct umutex *mtx) __hidden;
48int _thr_umtx_wait(volatile umtx_t *mtx, umtx_t exp,
49	const struct timespec *timeout) __hidden;
50int _thr_umtx_wake(volatile umtx_t *mtx, int count) __hidden;
51
52static inline int
53_thr_umutex_trylock(struct umutex *mtx, uint32_t id)
54{
55    if (atomic_cmpset_acq_32(&mtx->m_owner, UMUTEX_UNOWNED, id))
56	return (0);
57    if ((mtx->m_flags & UMUTEX_PRIO_PROTECT) == 0)
58    	return (EBUSY);
59    return (__thr_umutex_trylock(mtx));
60}
61
62static inline int
63_thr_umutex_lock(struct umutex *mtx, uint32_t id)
64{
65    if (atomic_cmpset_acq_32(&mtx->m_owner, UMUTEX_UNOWNED, id))
66	return (0);
67    return (__thr_umutex_lock(mtx));
68}
69
70static inline int
71_thr_umutex_timedlock(struct umutex *mtx, uint32_t id,
72	const struct timespec *timeout)
73{
74    if (atomic_cmpset_acq_32(&mtx->m_owner, UMUTEX_UNOWNED, id))
75	return (0);
76    return (__thr_umutex_timedlock(mtx, timeout));
77}
78
79static inline int
80_thr_umutex_unlock(struct umutex *mtx, uint32_t id)
81{
82    if (atomic_cmpset_rel_32(&mtx->m_owner, id, UMUTEX_UNOWNED))
83	return (0);
84    return (__thr_umutex_unlock(mtx));
85}
86
87#endif
88