2 * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@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 AUTHORS 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 AUTHORS 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
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
32 #include <sys/mutex.h>
33 #include <sys/atomic.h>
35 #if !defined(__LP64__) && !defined(__mips_n32) && \
36 !defined(ARM_HAVE_ATOMIC64) && !defined(I386_HAVE_ATOMIC64) && \
37 !defined(HAS_EMULATED_ATOMIC64)
40 #include <sys/kernel.h>
42 struct mtx atomic_mtx;
43 MTX_SYSINIT(atomic, &atomic_mtx, "atomic", MTX_DEF);
47 #define mtx_lock(lock) pthread_mutex_lock(lock)
48 #define mtx_unlock(lock) pthread_mutex_unlock(lock)
50 static pthread_mutex_t atomic_mtx;
52 static __attribute__((constructor)) void
55 pthread_mutex_init(&atomic_mtx, NULL);
60 atomic_add_64(volatile uint64_t *target, int64_t delta)
63 mtx_lock(&atomic_mtx);
65 mtx_unlock(&atomic_mtx);
69 atomic_dec_64(volatile uint64_t *target)
72 mtx_lock(&atomic_mtx);
74 mtx_unlock(&atomic_mtx);
78 atomic_swap_64(volatile uint64_t *a, uint64_t value)
82 mtx_lock(&atomic_mtx);
85 mtx_unlock(&atomic_mtx);
90 atomic_load_64(volatile uint64_t *a)
94 mtx_lock(&atomic_mtx);
96 mtx_unlock(&atomic_mtx);
101 atomic_add_64_nv(volatile uint64_t *target, int64_t delta)
105 mtx_lock(&atomic_mtx);
106 newval = (*target += delta);
107 mtx_unlock(&atomic_mtx);
112 atomic_cas_64(volatile uint64_t *target, uint64_t cmp, uint64_t newval)
116 mtx_lock(&atomic_mtx);
120 mtx_unlock(&atomic_mtx);