atomic-long.h revision 297658 
159191Skris/*-
259191Skris * Copyright (c) 2010 Isilon Systems, Inc.
359191Skris * Copyright (c) 2010 iX Systems, Inc.
459191Skris * Copyright (c) 2010 Panasas, Inc.
559191Skris * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd.
659191Skris * All rights reserved.
759191Skris *
859191Skris * Redistribution and use in source and binary forms, with or without
959191Skris * modification, are permitted provided that the following conditions
1059191Skris * are met:
11109998Smarkm * 1. Redistributions of source code must retain the above copyright
1259191Skris *    notice unmodified, this list of conditions, and the following
1359191Skris *    disclaimer.
1459191Skris * 2. Redistributions in binary form must reproduce the above copyright
1559191Skris *    notice, this list of conditions and the following disclaimer in the
1659191Skris *    documentation and/or other materials provided with the distribution.
1759191Skris *
1859191Skris * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
1959191Skris * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
2059191Skris * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
2159191Skris * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
2259191Skris * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
2359191Skris * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
2459191Skris * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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2859191Skris */
2959191Skris
3059191Skris#ifndef	_ATOMIC_LONG_H_
3159191Skris#define	_ATOMIC_LONG_H_
3259191Skris
3359191Skris#include <sys/cdefs.h>
34#include <sys/types.h>
35#include <machine/atomic.h>
36
37typedef struct {
38	volatile long counter;
39} atomic_long_t;
40
41#define	atomic_long_add(i, v)		atomic_long_add_return((i), (v))
42#define	atomic_long_inc_return(v)	atomic_long_add_return(1, (v))
43
44static inline long
45atomic_long_add_return(long i, atomic_long_t *v)
46{
47	return i + atomic_fetchadd_long(&v->counter, i);
48}
49
50static inline void
51atomic_long_set(atomic_long_t *v, long i)
52{
53	atomic_store_rel_long(&v->counter, i);
54}
55
56static inline long
57atomic_long_read(atomic_long_t *v)
58{
59	return atomic_load_acq_long(&v->counter);
60}
61
62static inline long
63atomic_long_inc(atomic_long_t *v)
64{
65	return atomic_fetchadd_long(&v->counter, 1) + 1;
66}
67
68static inline long
69atomic_long_dec(atomic_long_t *v)
70{
71	return atomic_fetchadd_long(&v->counter, -1) - 1;
72}
73
74static inline long
75atomic_long_dec_and_test(atomic_long_t *v)
76{
77	long i = atomic_long_add(-1, v);
78	return i == 0 ;
79}
80
81#endif	/* _ATOMIC_LONG_H_ */
82