projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 09d4e0ed PM |
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); | |
| 560cb12a PZ |
23 | |
| 24 | #define ATOMIC64_OP(op) \ | |
| 25 | extern void atomic64_##op(long long a, atomic64_t *v); | |
| 26 | ||
| 27 | #define ATOMIC64_OP_RETURN(op) \ | |
| 28 | extern long long atomic64_##op##_return(long long a, atomic64_t *v); | |
| 29 | ||
| 30 | #define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_OP_RETURN(op) | |
| 31 | ||
| 32 | ATOMIC64_OPS(add) | |
| 33 | ATOMIC64_OPS(sub) | |
| 34 | ||
| 35 | #undef ATOMIC64_OPS | |
| 36 | #undef ATOMIC64_OP_RETURN | |
| 37 | #undef ATOMIC64_OP | |
| 38 | ||
| 09d4e0ed PM |
39 | extern long long atomic64_dec_if_positive(atomic64_t *v); |
| 40 | extern long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n); | |
| 41 | extern long long atomic64_xchg(atomic64_t *v, long long new); | |
| 42 | extern int atomic64_add_unless(atomic64_t *v, long long a, long long u); | |
| 43 | ||
| 44 | #define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0) | |
| 45 | #define atomic64_inc(v) atomic64_add(1LL, (v)) | |
| 46 | #define atomic64_inc_return(v) atomic64_add_return(1LL, (v)) | |
| 47 | #define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0) | |
| 48 | #define atomic64_sub_and_test(a, v) (atomic64_sub_return((a), (v)) == 0) | |
| 49 | #define atomic64_dec(v) atomic64_sub(1LL, (v)) | |
| 50 | #define atomic64_dec_return(v) atomic64_sub_return(1LL, (v)) | |
| 51 | #define atomic64_dec_and_test(v) (atomic64_dec_return((v)) == 0) | |
| 52 | #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1LL, 0LL) | |
| 53 | ||
| 54 | #endif /* _ASM_GENERIC_ATOMIC64_H */ |