2 * Copyright (c) 2005 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
28 #ifndef _THR_DFLY_UMTX_H_
29 #define _THR_DFLY_UMTX_H_
34 #define UMTX_CONTESTED 2
36 #define cpu_pause() __asm __volatile("pause":::"memory")
40 int __thr_umtx_lock(volatile umtx_t *mtx, int id, int timo);
41 int __thr_umtx_timedlock(volatile umtx_t *mtx, int id,
42 const struct timespec *timeout);
43 void __thr_umtx_unlock(volatile umtx_t *mtx, int v, int id);
46 _thr_umtx_init(volatile umtx_t *mtx)
52 _thr_umtx_trylock(volatile umtx_t *mtx, int id)
54 if (atomic_cmpset_acq_int(mtx, 0, id))
57 if (atomic_cmpset_acq_int(mtx, 0, id))
60 if (atomic_cmpset_acq_int(mtx, 0, id))
66 _thr_umtx_lock(volatile umtx_t *mtx, int id)
68 if (atomic_cmpset_acq_int(mtx, 0, id))
70 return (__thr_umtx_lock(mtx, id, 0));
74 _thr_umtx_timedlock(volatile umtx_t *mtx, int id,
75 const struct timespec *timeout)
77 if (atomic_cmpset_acq_int(mtx, 0, id)) {
80 return (__thr_umtx_timedlock(mtx, id, timeout));
84 _thr_umtx_unlock(volatile umtx_t *mtx, int id)
88 v = atomic_swap_int(mtx, 0);
90 __thr_umtx_unlock(mtx, v, id);
93 int _thr_umtx_wait(volatile umtx_t *mtx, umtx_t exp,
94 const struct timespec *timeout, int clockid);
95 int _thr_umtx_wait_intr(volatile umtx_t *mtx, umtx_t exp);
96 void _thr_umtx_wake(volatile umtx_t *mtx, int count);