57 строки
1.6 KiB
C
57 строки
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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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. <paulus@au1.ibm.com>
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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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#include <linux/types.h>
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typedef struct {
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s64 counter;
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} atomic64_t;
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#define ATOMIC64_INIT(i) { (i) }
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extern s64 atomic64_read(const atomic64_t *v);
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extern void atomic64_set(atomic64_t *v, s64 i);
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#define atomic64_set_release(v, i) atomic64_set((v), (i))
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#define ATOMIC64_OP(op) \
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extern void atomic64_##op(s64 a, atomic64_t *v);
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#define ATOMIC64_OP_RETURN(op) \
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extern s64 atomic64_##op##_return(s64 a, atomic64_t *v);
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#define ATOMIC64_FETCH_OP(op) \
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extern s64 atomic64_fetch_##op(s64 a, atomic64_t *v);
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#define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_OP_RETURN(op) ATOMIC64_FETCH_OP(op)
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ATOMIC64_OPS(add)
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ATOMIC64_OPS(sub)
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#undef ATOMIC64_OPS
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#define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_FETCH_OP(op)
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ATOMIC64_OPS(and)
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ATOMIC64_OPS(or)
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ATOMIC64_OPS(xor)
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#undef ATOMIC64_OPS
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#undef ATOMIC64_FETCH_OP
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#undef ATOMIC64_OP_RETURN
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#undef ATOMIC64_OP
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extern s64 atomic64_dec_if_positive(atomic64_t *v);
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#define atomic64_dec_if_positive atomic64_dec_if_positive
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extern s64 atomic64_cmpxchg(atomic64_t *v, s64 o, s64 n);
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extern s64 atomic64_xchg(atomic64_t *v, s64 new);
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extern s64 atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u);
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#define atomic64_fetch_add_unless atomic64_fetch_add_unless
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#endif /* _ASM_GENERIC_ATOMIC64_H */
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