thr_umtx.h revision 153594 
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 153594 2005-12-21 03:53:29Z 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
36int __thr_umtx_lock(volatile umtx_t *mtx, long id) __hidden;
37int __thr_umtx_timedlock(volatile umtx_t *mtx, long id,
38	const struct timespec *timeout) __hidden;
39int __thr_umtx_unlock(volatile umtx_t *mtx, long id) __hidden;
40
41static inline void
42_thr_umtx_init(volatile umtx_t *mtx)
43{
44    *mtx = 0;
45}
46
47static inline int
48_thr_umtx_trylock(volatile umtx_t *mtx, long id)
49{
50    if (atomic_cmpset_acq_ptr((volatile uintptr_t *)mtx,
51	(uintptr_t)UMTX_UNOWNED, (uintptr_t)id))
52	return (0);
53    return (EBUSY);
54}
55
56static inline int
57_thr_umtx_lock(volatile umtx_t *mtx, long id)
58{
59    if (atomic_cmpset_acq_ptr((volatile uintptr_t *)mtx,
60	(uintptr_t)UMTX_UNOWNED, (uintptr_t)id))
61	return (0);
62    return (__thr_umtx_lock(mtx, id));
63}
64
65static inline int
66_thr_umtx_timedlock(volatile umtx_t *mtx, long id,
67	const struct timespec *timeout)
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_timedlock(mtx, id, timeout));
73}
74
75static inline int
76_thr_umtx_unlock(volatile umtx_t *mtx, long id)
77{
78    if (atomic_cmpset_rel_ptr((volatile uintptr_t *)mtx,
79	(uintptr_t)id, (uintptr_t)UMTX_UNOWNED))
80	return (0);
81    return __thr_umtx_unlock(mtx, id);
82}
83
84int _thr_umtx_wait(volatile umtx_t *mtx, umtx_t exp,
85	const struct timespec *timeout) __hidden;
86int _thr_umtx_wake(volatile umtx_t *mtx, int count) __hidden;
87#endif
88