thr_umtx.c revision 144518 
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 144518 2005-04-02 01:20:00Z davidxu $
27 *
28 */
29
30#include "thr_private.h"
31#include "thr_umtx.h"
32
33int
34__thr_umtx_lock(volatile umtx_t *mtx, long id)
35{
36	while (_umtx_op((struct umtx *)mtx, UMTX_OP_LOCK, id, 0, 0))
37		;
38	return (0);
39}
40
41int
42__thr_umtx_timedlock(volatile umtx_t *mtx, long id,
43	const struct timespec *timeout)
44{
45	if (timeout && (timeout->tv_sec < 0 || (timeout->tv_sec == 0 &&
46		timeout->tv_nsec <= 0)))
47		return (ETIMEDOUT);
48	if (_umtx_op((struct umtx *)mtx, UMTX_OP_LOCK, id, 0,
49		(void *)timeout) == 0)
50		return (0);
51	return (errno);
52}
53
54int
55__thr_umtx_unlock(volatile umtx_t *mtx, long id)
56{
57	if (_umtx_op((struct umtx *)mtx, UMTX_OP_UNLOCK, id, 0, 0) == 0)
58		return (0);
59	return (errno);
60}
61
62int
63_thr_umtx_wait(volatile umtx_t *mtx, long id, const struct timespec *timeout)
64{
65	if (timeout && (timeout->tv_sec < 0 || (timeout->tv_sec == 0 &&
66		timeout->tv_nsec <= 0)))
67		return (ETIMEDOUT);
68	if (_umtx_op((struct umtx *)mtx, UMTX_OP_WAIT, id, 0,
69		(void*) timeout) == 0)
70		return (0);
71	return (errno);
72}
73
74int
75_thr_umtx_wake(volatile umtx_t *mtx, int nr_wakeup)
76{
77	if (_umtx_op((struct umtx *)mtx, UMTX_OP_WAKE, nr_wakeup, 0, 0) == 0)
78		return (0);
79	return (errno);
80}
81