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>
36 #include <sys/kernel.h>
38 struct mtx atomic_mtx;
39 MTX_SYSINIT(atomic, &atomic_mtx, "atomic", MTX_DEF);
43 #define mtx_lock(lock) pthread_mutex_lock(lock)
44 #define mtx_unlock(lock) pthread_mutex_unlock(lock)
46 static pthread_mutex_t atomic_mtx;
48 static __attribute__((constructor)) void
51 pthread_mutex_init(&atomic_mtx, NULL);
57 atomic_add_64(volatile uint64_t *target, int64_t delta)
60 mtx_lock(&atomic_mtx);
62 mtx_unlock(&atomic_mtx);
67 atomic_add_64_nv(volatile uint64_t *target, int64_t delta)
71 mtx_lock(&atomic_mtx);
72 newval = (*target += delta);
73 mtx_unlock(&atomic_mtx);
77 #if defined(__sparc64__) || defined(__powerpc__) || defined(__arm__)
79 atomic_or_8(volatile uint8_t *target, uint8_t value)
81 mtx_lock(&atomic_mtx);
83 mtx_unlock(&atomic_mtx);
88 atomic_or_8_nv(volatile uint8_t *target, uint8_t value)
92 mtx_lock(&atomic_mtx);
93 newval = (*target |= value);
94 mtx_unlock(&atomic_mtx);
100 atomic_cas_ptr(volatile void *target, void *cmp, void *newval)
104 mtx_lock(&atomic_mtx);
105 trg = __DEVOLATILE(void **, target);
109 mtx_unlock(&atomic_mtx);
116 atomic_cas_64(volatile uint64_t *target, uint64_t cmp, uint64_t newval)
120 mtx_lock(&atomic_mtx);
124 mtx_unlock(&atomic_mtx);
130 membar_producer(void)