2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013-2017 Mellanox Technologies, Ltd.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice unmodified, this list of conditions, and the following
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 #ifndef _ATOMIC_LONG_H_
32 #define _ATOMIC_LONG_H_
34 #include <linux/compiler.h>
35 #include <sys/types.h>
36 #include <machine/atomic.h>
38 #define ATOMIC_LONG_INIT(x) { .counter = (x) }
41 volatile long counter;
44 #define atomic_long_add(i, v) atomic_long_add_return((i), (v))
45 #define atomic_long_sub(i, v) atomic_long_add_return(-(i), (v))
46 #define atomic_long_inc_return(v) atomic_long_add_return(1, (v))
47 #define atomic_long_inc_not_zero(v) atomic_long_add_unless((v), 1, 0)
50 atomic_long_add_return(long i, atomic_long_t *v)
52 return i + atomic_fetchadd_long(&v->counter, i);
56 atomic_long_set(atomic_long_t *v, long i)
58 WRITE_ONCE(v->counter, i);
62 atomic_long_read(atomic_long_t *v)
64 return READ_ONCE(v->counter);
68 atomic_long_inc(atomic_long_t *v)
70 return atomic_fetchadd_long(&v->counter, 1) + 1;
74 atomic_long_dec(atomic_long_t *v)
76 return atomic_fetchadd_long(&v->counter, -1) - 1;
80 atomic_long_xchg(atomic_long_t *v, long val)
82 return atomic_swap_long(&v->counter, val);
86 atomic_long_cmpxchg(atomic_long_t *v, long old, long new)
91 if (atomic_fcmpset_long(&v->counter, &ret, new))
100 atomic_long_add_unless(atomic_long_t *v, long a, long u)
102 long c = atomic_long_read(v);
105 if (unlikely(c == u))
107 if (likely(atomic_fcmpset_long(&v->counter, &c, c + a)))
114 atomic_long_dec_and_test(atomic_long_t *v)
116 long i = atomic_long_add(-1, v);
120 #endif /* _ATOMIC_LONG_H_ */