2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice unmodified, this list of conditions, and the following
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 #ifndef _ATOMIC_LONG_H_
29 #define _ATOMIC_LONG_H_
31 #include <sys/cdefs.h>
32 #include <sys/types.h>
33 #include <machine/atomic.h>
36 volatile u_long counter;
39 #define atomic_long_add(i, v) atomic_long_add_return((i), (v))
40 #define atomic_long_inc_return(v) atomic_long_add_return(1, (v))
43 atomic_long_add_return(long i, atomic_long_t *v)
45 return i + atomic_fetchadd_long(&v->counter, i);
49 atomic_long_set(atomic_long_t *v, long i)
51 atomic_store_rel_long(&v->counter, i);
55 atomic_long_read(atomic_long_t *v)
57 return atomic_load_acq_long(&v->counter);
61 atomic_long_inc(atomic_long_t *v)
63 return atomic_fetchadd_long(&v->counter, 1) + 1;
67 atomic_long_dec(atomic_long_t *v)
69 return atomic_fetchadd_long(&v->counter, -1) - 1;
73 atomic_long_dec_and_test(atomic_long_t *v)
75 long i = atomic_long_add(-1, v);
79 #endif /* _ATOMIC_LONG_H_ */