Go to most recent revision | Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6514 | serge | 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. |
||
| 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 | |||
| 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 | ATOMIC64_OP(and) |
||
| 36 | ATOMIC64_OP(or) |
||
| 37 | ATOMIC64_OP(xor) |
||
| 38 | |||
| 39 | #undef ATOMIC64_OPS |
||
| 40 | #undef ATOMIC64_OP_RETURN |
||
| 41 | #undef ATOMIC64_OP |
||
| 42 | |||
| 43 | extern long long atomic64_dec_if_positive(atomic64_t *v); |
||
| 44 | extern long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n); |
||
| 45 | extern long long atomic64_xchg(atomic64_t *v, long long new); |
||
| 46 | extern int atomic64_add_unless(atomic64_t *v, long long a, long long u); |
||
| 47 | |||
| 48 | #define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0) |
||
| 49 | #define atomic64_inc(v) atomic64_add(1LL, (v)) |
||
| 50 | #define atomic64_inc_return(v) atomic64_add_return(1LL, (v)) |
||
| 51 | #define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0) |
||
| 52 | #define atomic64_sub_and_test(a, v) (atomic64_sub_return((a), (v)) == 0) |
||
| 53 | #define atomic64_dec(v) atomic64_sub(1LL, (v)) |
||
| 54 | #define atomic64_dec_return(v) atomic64_sub_return(1LL, (v)) |
||
| 55 | #define atomic64_dec_and_test(v) (atomic64_dec_return((v)) == 0) |
||
| 56 | #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1LL, 0LL) |
||
| 57 | |||
| 58 | #endif /* _ASM_GENERIC_ATOMIC64_H */ |