80 lines
2.4 KiB
C
80 lines
2.4 KiB
C
/*-
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* Copyright (c) 2010 Isilon Systems, Inc.
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* Copyright (c) 2010 iX Systems, Inc.
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* Copyright (c) 2010 Panasas, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _ATOMIC_LONG_H_
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#define _ATOMIC_LONG_H_
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <machine/atomic.h>
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typedef struct {
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volatile u_long counter;
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} atomic_long_t;
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#define atomic_long_add(i, v) atomic_long_add_return((i), (v))
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#define atomic_long_inc_return(v) atomic_long_add_return(1, (v))
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static inline long
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atomic_long_add_return(long i, atomic_long_t *v)
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{
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return i + atomic_fetchadd_long(&v->counter, i);
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}
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static inline void
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atomic_long_set(atomic_long_t *v, long i)
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{
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atomic_store_rel_long(&v->counter, i);
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}
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static inline long
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atomic_long_read(atomic_long_t *v)
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{
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return atomic_load_acq_long(&v->counter);
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}
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static inline long
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atomic_long_inc(atomic_long_t *v)
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{
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return atomic_fetchadd_long(&v->counter, 1) + 1;
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}
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static inline long
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atomic_long_dec(atomic_long_t *v)
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{
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return atomic_fetchadd_long(&v->counter, -1) - 1;
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}
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static inline long
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atomic_long_dec_and_test(atomic_long_t *v)
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{
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long i = atomic_long_add(-1, v);
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return i == 0 ;
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}
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#endif /* _ATOMIC_LONG_H_ */
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