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1 | /* |
2 | * Generic implementation of 64-bit atomics using spinlocks, |
3 | * useful on processors that don't have 64-bit atomic instructions. |
4 | * |
5 | * Copyright © 2009 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com> |
6 | * |
7 | * This program is free software; you can redistribute it and/or |
8 | * modify it under the terms of the GNU General Public License |
9 | * as published by the Free Software Foundation; either version |
10 | * 2 of the License, or (at your option) any later version. |
11 | */ |
12 | #ifndef _ASM_GENERIC_ATOMIC64_H |
13 | #define _ASM_GENERIC_ATOMIC64_H |
14 | |
15 | typedef struct { |
16 | long long counter; |
17 | } atomic64_t; |
18 | |
19 | #define ATOMIC64_INIT(i) { (i) } |
20 | |
21 | extern long long atomic64_read(const atomic64_t *v); |
22 | extern void atomic64_set(atomic64_t *v, long long i); |
23 | extern void atomic64_add(long long a, atomic64_t *v); |
24 | extern long long atomic64_add_return(long long a, atomic64_t *v); |
25 | extern void atomic64_sub(long long a, atomic64_t *v); |
26 | extern long long atomic64_sub_return(long long a, atomic64_t *v); |
27 | extern long long atomic64_dec_if_positive(atomic64_t *v); |
28 | extern long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n); |
29 | extern long long atomic64_xchg(atomic64_t *v, long long new); |
30 | extern int atomic64_add_unless(atomic64_t *v, long long a, long long u); |
31 | |
32 | #define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0) |
33 | #define atomic64_inc(v) atomic64_add(1LL, (v)) |
34 | #define atomic64_inc_return(v) atomic64_add_return(1LL, (v)) |
35 | #define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0) |
36 | #define atomic64_sub_and_test(a, v) (atomic64_sub_return((a), (v)) == 0) |
37 | #define atomic64_dec(v) atomic64_sub(1LL, (v)) |
38 | #define atomic64_dec_return(v) atomic64_sub_return(1LL, (v)) |
39 | #define atomic64_dec_and_test(v) (atomic64_dec_return((v)) == 0) |
40 | #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1LL, 0LL) |
41 | |
42 | #endif /* _ASM_GENERIC_ATOMIC64_H */ |
43 |
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