thr_umtx.c revision 165370 
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 unmodified, this list of conditions, and the following
10 *    disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
26 * $FreeBSD: head/lib/libthr/thread/thr_umtx.c 165370 2006-12-20 04:43:34Z davidxu $
27 *
28 */
29
30#include "thr_private.h"
31#include "thr_umtx.h"
32
33void
34_thr_umutex_init(struct umutex *mtx)
35{
36	static struct umutex default_mtx = DEFAULT_UMUTEX;
37
38	*mtx = default_mtx;
39	mtx->m_spincount = _thr_adaptive_spin;
40}
41
42int
43__thr_umutex_lock(struct umutex *mtx)
44{
45	if (_umtx_op(mtx, UMTX_OP_MUTEX_LOCK, 0, 0, 0) != -1)
46		return 0;
47	return (errno);
48}
49
50int
51__thr_umutex_timedlock(struct umutex *mtx,
52	const struct timespec *timeout)
53{
54	if (timeout && (timeout->tv_sec < 0 || (timeout->tv_sec == 0 &&
55		timeout->tv_nsec <= 0)))
56		return (ETIMEDOUT);
57	if (_umtx_op(mtx, UMTX_OP_MUTEX_LOCK, 0, 0,
58		__DECONST(void *, timeout)) != -1)
59		return (0);
60	return (errno);
61}
62
63int
64__thr_umutex_unlock(struct umutex *mtx)
65{
66	if (_umtx_op(mtx, UMTX_OP_MUTEX_UNLOCK, 0, 0, 0) != -1)
67		return (0);
68	return (errno);
69}
70
71int
72__thr_umutex_trylock(struct umutex *mtx)
73{
74	if (_umtx_op(mtx, UMTX_OP_MUTEX_TRYLOCK, 0, 0, 0) != -1)
75		return (0);
76	return (errno);
77}
78
79int
80__thr_umutex_set_ceiling(struct umutex *mtx, uint32_t ceiling,
81	uint32_t *oldceiling)
82{
83	if (_umtx_op(mtx, UMTX_OP_SET_CEILING, ceiling, oldceiling, 0) != -1)
84		return (0);
85	return (errno);
86}
87
88int
89_thr_umtx_wait(volatile umtx_t *mtx, long id, const struct timespec *timeout)
90{
91	if (timeout && (timeout->tv_sec < 0 || (timeout->tv_sec == 0 &&
92		timeout->tv_nsec <= 0)))
93		return (ETIMEDOUT);
94	if (_umtx_op(__DEVOLATILE(void *, mtx), UMTX_OP_WAIT, id, 0,
95		__DECONST(void*, timeout)) != -1)
96		return (0);
97	return (errno);
98}
99
100int
101_thr_umtx_wake(volatile umtx_t *mtx, int nr_wakeup)
102{
103	if (_umtx_op(__DEVOLATILE(void *, mtx), UMTX_OP_WAKE,
104		nr_wakeup, 0, 0) != -1)
105		return (0);
106	return (errno);
107}
108
109void
110_thr_ucond_init(struct ucond *cv)
111{
112	bzero(cv, sizeof(struct ucond));
113}
114
115int
116_thr_ucond_wait(struct ucond *cv, struct umutex *m,
117	const struct timespec *timeout, int check_unparking)
118{
119	if (timeout && (timeout->tv_sec < 0 || (timeout->tv_sec == 0 &&
120	    timeout->tv_nsec <= 0))) {
121		__thr_umutex_unlock(m);
122                return (ETIMEDOUT);
123	}
124	if (_umtx_op(cv, UMTX_OP_CV_WAIT,
125		     check_unparking ? UMTX_CHECK_UNPARKING : 0,
126		     m, __DECONST(void*, timeout)) != -1) {
127		return (0);
128	}
129	return (errno);
130}
131
132int
133_thr_ucond_signal(struct ucond *cv)
134{
135	if (!cv->c_has_waiters)
136		return (0);
137	if (_umtx_op(cv, UMTX_OP_CV_SIGNAL, 0, NULL, NULL) != -1)
138		return (0);
139	return (errno);
140}
141
142int
143_thr_ucond_broadcast(struct ucond *cv)
144{
145	if (!cv->c_has_waiters)
146		return (0);
147	if (_umtx_op(cv, UMTX_OP_CV_BROADCAST, 0, NULL, NULL) != -1)
148		return (0);
149	return (errno);
150}
151