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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/include/asm-generic/atomic64.h
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/*

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 * Generic implementation of 64-bit atomics using spinlocks,

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 * useful on processors that don't have 64-bit atomic instructions.

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 *

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 * Copyright © 2009 Paul Mackerras, IBM Corp. <[email protected]>

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 *

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 * This program is free software; you can redistribute it and/or

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 * modify it under the terms of the GNU General Public License

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 * as published by the Free Software Foundation; either version

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 * 2 of the License, or (at your option) any later version.

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 */

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#ifndef _ASM_GENERIC_ATOMIC64_H

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#define _ASM_GENERIC_ATOMIC64_H

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typedef struct {

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	long long counter;

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} atomic64_t;

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#define ATOMIC64_INIT(i)	{ (i) }

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extern long long atomic64_read(const atomic64_t *v);

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extern void	 atomic64_set(atomic64_t *v, long long i);

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extern void	 atomic64_add(long long a, atomic64_t *v);

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extern long long atomic64_add_return(long long a, atomic64_t *v);

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extern void	 atomic64_sub(long long a, atomic64_t *v);

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extern long long atomic64_sub_return(long long a, atomic64_t *v);

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extern long long atomic64_dec_if_positive(atomic64_t *v);

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extern long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n);

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extern long long atomic64_xchg(atomic64_t *v, long long new);

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extern int	 atomic64_add_unless(atomic64_t *v, long long a, long long u);

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#define atomic64_add_negative(a, v)	(atomic64_add_return((a), (v)) < 0)

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#define atomic64_inc(v)			atomic64_add(1LL, (v))

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#define atomic64_inc_return(v)		atomic64_add_return(1LL, (v))

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#define atomic64_inc_and_test(v) 	(atomic64_inc_return(v) == 0)

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#define atomic64_sub_and_test(a, v)	(atomic64_sub_return((a), (v)) == 0)

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#define atomic64_dec(v)			atomic64_sub(1LL, (v))

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#define atomic64_dec_return(v)		atomic64_sub_return(1LL, (v))

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#define atomic64_dec_and_test(v)	(atomic64_dec_return((v)) == 0)

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#define atomic64_inc_not_zero(v) 	atomic64_add_unless((v), 1LL, 0LL)

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#endif  /*  _ASM_GENERIC_ATOMIC64_H  */

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