2 * Copyright (c) 2003 David Xu <davidxu@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
26 * $DragonFly: src/lib/libthread_xu/thread/thr_umtx.h,v 1.2 2005/03/15 11:24:23 davidxu Exp $
29 #ifndef _THR_DFLY_UMTX_H_
30 #define _THR_DFLY_UMTX_H_
34 #define UMTX_LOCKED 0x80000000
38 int __thr_umtx_lock(volatile umtx_t *mtx, int timo);
39 int __thr_umtx_timedlock(volatile umtx_t *mtx,
40 const struct timespec *timeout);
41 void __thr_umtx_unlock(volatile umtx_t *mtx);
44 _thr_umtx_init(volatile umtx_t *mtx)
50 _thr_umtx_trylock(volatile umtx_t *mtx, long id)
52 if (atomic_cmpset_acq_int(mtx, 0, UMTX_LOCKED))
58 _thr_umtx_lock(volatile umtx_t *mtx, long id)
60 if (atomic_cmpset_acq_int(mtx, 0, UMTX_LOCKED))
62 return (__thr_umtx_lock(mtx, 0));
66 _thr_umtx_timedlock(volatile umtx_t *mtx, long id,
67 const struct timespec *timeout)
69 if (atomic_cmpset_acq_int(mtx, 0, UMTX_LOCKED))
71 return (__thr_umtx_timedlock(mtx, timeout));
75 _thr_umtx_unlock(volatile umtx_t *mtx, long id)
77 if (atomic_cmpset_acq_int(mtx, UMTX_LOCKED, 0))
79 __thr_umtx_unlock(mtx);
82 int _thr_umtx_wait(volatile umtx_t *mtx, umtx_t exp,
83 const struct timespec *timeout, int clockid);
84 void _thr_umtx_wake(volatile umtx_t *mtx, int count);